High-energy QCD evolution beyond leading order suffers from instabilities driven by large collinear logarithms. We present a framework, consistent with the standard high-energy operator product expansion, that restores perturbative stability order by order. The method involves a change of basis in t…

[Phys. Rev. Lett. 137, 121903] Published Tue Sep 15, 2026

This Letter presents a measurement of prompt charged-particle production in proton-oxygen interactions at $\sqrt{s_{\mathrm{NN}}}=9.62\mathrm{TeV}$ center-of-mass energy with the ATLAS detector, corresponding to $634\mu {\mathrm{b}}^{-1}$ of integrated luminosity. A total of $246\times {10}^6$ selected events have at least one track with transverse momen…

[Phys. Rev. Lett. 137, 121901] Published Mon Sep 14, 2026

Conformal supergravity provides an effective off-shell formalism to study higher derivative actions. We show that the $D=4$, $\mathcal{N}=2$ theory admits equivariantly closed forms. These may be used to compute closed-form expressions for supersymmetric observables in a general class of supergravity theories wit…

[Phys. Rev. Lett. 137, 111602] Published Fri Sep 11, 2026

First measurements of quantum entanglement between two massive vector bosons at the electroweak scale link quantum information concepts with precision measurements.

[Phys. Rev. Lett. 137, 111804] Published Fri Sep 11, 2026

We report the precise energy scan measurement of the cross section line shape of $\psi (2S)\to K^{+}{K}^{-}$. The analysis is based on $e^{+}{e}^{-}$ collision data corresponding to an integrated luminosity of $495{\mathrm{pb}}^{-1}$ collected with the BESIII detector at BEPCII. By analyzing the cross section line shape, we extract the rel…

[Phys. Rev. Lett. 137, 111904] Published Fri Sep 11, 2026

We investigate the QCD transverse-energy ($E_T$) flow distribution within an azimuthal region of phase space, defined by an angular interval $\mathrm{\Delta }\varphi$ on the plane transverse to a chosen reference axis. Vetoes on the resulting $E_T$ are widely employed at the LHC to isolate missing transverse momentum in final s…

[Phys. Rev. Lett. 137, 111906] Published Fri Sep 11, 2026

A precision measurement of the muon charge asymmetry from $W$-boson decays in proton-proton collisions at $\sqrt{s}=13\mathrm{TeV}$ is presented. The analysis utilizes data corresponding to an integrated luminosity of $5.1{\mathrm{fb}}^{-1}$, recorded by the LHCb detector during 2016, 2017, and 2018. The asymmetry is measured for …

[Phys. Rev. Lett. 137, 111801] Published Thu Sep 10, 2026

High-intensity muon beams could enable a muonium-based axion search through resonant quantum transitions between hyperfine states. Combining theoretical calculations with simulation results, we demonstrate that such a muonium-based experimental approach could complement and tighten constraints on th…

[Phys. Rev. Lett. 137, 111803] Published Thu Sep 10, 2026

We calculate all three-loop, five-point, massless planar Feynman integral families in the dimensional regularization scheme. This is a new milestone in Feynman integral computations. The analysis covers four distinct families of Feynman integrals for this configuration, for all of which we derive th…

[Phys. Rev. Lett. 137, 111603] Published Wed Sep 09, 2026

We show that the infinite tower of hard exclusive amplitudes in holographic light-front QCD leads to a spectral generator $G(\alpha ,\lambda )$ that encodes the full Regge spectrum. The construction assumes a Poisson distribution of Fock-state components, where $\lambda$ represents the average parton multiplicity above th…

[Phys. Rev. Lett. 137, 111903] Published Wed Sep 09, 2026

QCD collinear factorization allows coherent hard exclusive reactions to reveal the quark-gluon structure of light nuclei, enabling their 3D tomography. In this Letter, we investigate elastic form factors and deeply virtual Compton scattering on a helium-4 target. We achieve unprecedented theoretical…

[Phys. Rev. Lett. 137, 111905] Published Wed Sep 09, 2026

We study local quantum field theories in anti–de Sitter (AdS) space, with boundary conditions that break some of the bulk isometries. Specifically, we focus on conformal defects and we prove that their spectrum supports a displacement operator of protected dimension, despite the nonlocal nature of t…

[Phys. Rev. Lett. 137, 111601] Published Tue Sep 08, 2026

While most studies of the minimal type-I seesaw neglect the heaviest decoupled right-handed neutrino, assuming negligible contributions to neutrino masses and leptogenesis, we demonstrate that its cosmological role can be significant. When long-lived, the presence of this particle can substantially …

[Phys. Rev. Lett. 137, 111802] Published Tue Sep 08, 2026

This Letter presents a lattice quantum chromodynamics (QCD) determination of $\pi \pi \pi$ scattering amplitudes for the isospin-2 channel with angular momentum and parity $J^P=1^{+}$. The calculation is performed using unphysically heavy light-quark masses, corresponding to a pion mass of $m_{\pi }\approx 400\mathrm{MeV}$, for which th…

[Phys. Rev. Lett. 137, 111901] Published Tue Sep 08, 2026

We report the first measurement of one- and two-point energy correlators within jets in transversely polarized proton-proton collisions at $\sqrt{s}=200\mathrm{GeV}$, using the STAR detector at the Relativistic Heavy Ion Collider. These observables quantify the energy-weighted angular distribution of single hadrons…

[Phys. Rev. Lett. 137, 111902] Published Tue Sep 08, 2026

The SNO+ Collaboration reports new results on reactor antineutrino oscillations using data acquired from May 2022 through July 2025. The spectral analysis of a flux dominated by nuclear reactors at 240, 340, and 350 km yields the mass-squared difference $\mathrm{\Delta }{m}_{21}^2=(7.91_{-0.25}^{+0.22})\times {10}^{-5}{\mathrm{eV}}^2$. This result …

[Phys. Rev. Lett. 137, 101807] Published Fri Sep 04, 2026

We study the giant graviton integrated correlator in $\mathrm{SU}(N)$ $\mathcal{N}=4$ super-Yang-Mills at finite complexified coupling $\tau$. Despite the formidable complexity arising from the heavy nature of the operators considered, the large-$N$ expansion simplifies dramatically and exhibits manifest modular invariance. At e…

[Phys. Rev. Lett. 137, 101601] Published Thu Sep 03, 2026

The first search for production of a Higgs boson along with a pair of vector bosons yields constraints on Higgs self-coupling constants.

[Phys. Rev. Lett. 137, 101806] Published Thu Sep 03, 2026

This Letter extends a recent IceCube sterile neutrino search to include unstable sterile neutrinos within the context of a model termed $3+1+\mathrm{Decay}$, which expands upon the $3+1$ model by introducing sterile neutrino decay to invisible particles with coupling constant $g^2$. The model is attractive since it…

[Phys. Rev. Lett. 137, 101801] Published Wed Sep 02, 2026

We propose the use of several unconventional materials as detectors for dark matter with mass beneath the MeV scale. These include the transition-metal dichalcogenide ${\mathrm{TiSe}}_2$ hosting a low-energy plasmon in the charge-density-wave phase, ${\mathrm{Sr}}_2{\mathrm{RuO}}_4$ containing a low-energy acoustic demon mode, and hole-do…

[Phys. Rev. Lett. 137, 101802] Published Wed Sep 02, 2026

We report results from searches for new physics models through electron recoils using data collected by the LUX-ZEPLIN experiment during its first two science runs, with a total exposure of $4.2\mathrm{tonne}\text{−}\mathrm{years}$. The observed data are consistent with a background-only hypothesis. Constraints are derived …

[Phys. Rev. Lett. 137, 101803] Published Wed Sep 02, 2026

Two studies find that fundamental quantum constraints rule out a previously proposed neutrino-laser scheme.

[Phys. Rev. Lett. 137, 101804] Published Wed Sep 02, 2026

Two studies find that fundamental quantum constraints rule out a previously proposed neutrino-laser scheme.

[Phys. Rev. Lett. 137, 101805] Published Wed Sep 02, 2026

We determine the complete three-loop QCD soft anomalous dimension for multileg amplitudes involving a single massive colored particle and any number of massless ones. This is achieved by applying a novel strategy based on a light-cone expansion of correlators of semi-infinite Wilson lines using the …

[Phys. Rev. Lett. 137, 101901] Published Wed Sep 02, 2026

The LZ collaboration reports strong evidence (4.5$\sigma$) for coherent elastic scattering of ${}^8$B solar neutrinos.

[Phys. Rev. Lett. 137, 091806] Published Fri Aug 28, 2026

We report a $3.3\sigma$ measurement of coherent elastic neutrino-nucleus scattering from solar ${}^8\mathrm{B}$ neutrinos using a $6.77\mathrm{t}\times \mathrm{yr}$ exposure from the XENONnT experiment, inferring a solar ${}^8\mathrm{B}$ neutrino flux of $(5_{-2}^{+3})\times {10}^6{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$, consistent with previous measurements. In the presence of the ${}^8\mathrm{B}$ “neutrino fog,” …

[Phys. Rev. Lett. 137, 091807] Published Fri Aug 28, 2026

Using $20.3{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data taken at the center-of-mass energy of $\sqrt{s}=3.773\mathrm{GeV}$, we report the first experimental constraint on the scalar current in the $D^{0(+)}\to \overline{K}{\ell }^{+}{\nu }_{\ell }$ transitions, based on a simultaneous fit to the first measured forward-backward asymmetries and precisely determined parti…

[Phys. Rev. Lett. 137, 091803] Published Thu Aug 27, 2026

This Letter presents the first evidence of the simultaneous production of two $Z$ bosons and one photon with the ATLAS detector at the Large Hadron Collider. The measurement is performed using the full Run-2 dataset, recorded from 2015 to 2018, of proton-proton collisions at a center-of-mass energy of…

[Phys. Rev. Lett. 137, 091804] Published Thu Aug 27, 2026

Evidence of the production of two $Z$ bosons and a photon in proton-proton collisions is reported for the first time in CMS. The analysis uses data collected by the CMS experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $138{\mathrm{fb}}^{-1}$. Eviden…

[Phys. Rev. Lett. 137, 091805] Published Thu Aug 27, 2026

We apply continuous normalizing flows trained with the flow matching method to the problem of phase-space sampling in Monte Carlo event generation for high-energy collider physics. Focusing on lepton-pair and top-quark pair production with multiple jets, the two computationally most expensive proces…

[Phys. Rev. Lett. 137, 091902] Published Thu Aug 27, 2026

Using $20.3{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observation of the semileptonic decays $D^0\to K^{-}\omega e^{+}{\nu }_e$ and $D^{+}\to K_S^0\omega e^{+}{\nu }_e$ with significances of $8.0\sigma$ and $5.8\sigma$, respectively. Their decay branching fractions are measured…

[Phys. Rev. Lett. 137, 091802] Published Wed Aug 26, 2026

The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of ${\mathrm{\Lambda }}_c$ baryons is studied in collisions of protons, at an energy of 2.51 TeV, incident on a gaseous target of neon, at a nucleon-nucleon center-of-mass energy…

[Phys. Rev. Lett. 137, 091901] Published Wed Aug 26, 2026

Mapping the $S$ matrix of a generic theory of flat-space gravity coupled to matter to correlation functions of a putative Carrollian dual, we show that bulk interactions imply boundary nonlocality.

[Phys. Rev. Lett. 137, 091601] Published Tue Aug 25, 2026

Using $(10087\pm 44)\times {10}^{6}J/\psi$ events collected with the BESIII detector, we study the semileptonic decay ${\mathrm{\Xi }}^{-}\to \mathrm{\Lambda }{e}^{-}{\overline{\nu }}_e$ for the first time at an electron-positron collider. The absolute branching fraction is determined for the first time to be $(3.60\pm 0.40_{\mathrm{stat}}\pm 0.10_{\mathrm{syst}})\times {10}^{-4}$, which is 3.9 standard deviations …

[Phys. Rev. Lett. 137, 091801] Published Mon Aug 24, 2026

We apply harmonic analysis to study the $T\overline{T}$-deformed torus partition function. We first express the CFT partition functions in terms of Maass waveforms, including the Eisenstein series and cusp forms. These basis functions turn out to deform in a very simple way under the $T\overline{T}$ deformation. The spectr…

[Phys. Rev. Lett. 137, 081603] Published Fri Aug 21, 2026

A measurement of the flavor-untagged decay-time-integrated $CP$ asymmetry in the flavor-specific decay $B_s^0\to D_s^{-}{\pi }^{+}$, $⟨A_{\text{untagged}}^s⟩$, is performed using proton-proton collision data collected by the LHCb experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to a total integrat…

[Phys. Rev. Lett. 137, 081802] Published Fri Aug 21, 2026

We present the first calculation of hadron production in deep-inelastic scattering (DIS) at finite transverse momentum to next-to-next-to-leading order (NNLO) in perturbative QCD. To overcome the long-standing challenge of infrared divergences in semi-inclusive processes with identified final state …

[Phys. Rev. Lett. 137, 081902] Published Fri Aug 21, 2026

Matter-induced neutrino flavor mixing (the Mikheyev-Smirnov-Wolfenstein, or MSW, effect) is a central prediction of the neutrino mixing framework, but it has not been conclusively observed. Direct observation of the energy-dependent MSW transition in the solar electron-neutrino survival probability …

[Phys. Rev. Lett. 137, 081801] Published Wed Aug 19, 2026

We develop a consistent partially off-shell framework for evaluating higher-derivative actions of five-dimensional $\mathcal{N}=1$ gauged supergravity with Abelian vector multiplets on ${\mathrm{AdS}}_5$. Using the superconformal formalism, we show that the resulting holographic expression reproduces the trial $a$-anomaly coef…

[Phys. Rev. Lett. 137, 081602] Published Tue Aug 18, 2026

All 43 previously unconstrained Lorentz-violating degrees of freedom in the minimal matter sector are constrained for the first time, completing a decades-long program.

[Phys. Rev. Lett. 137, 081601] Published Mon Aug 17, 2026

We consider the anomalous dimension ${\gamma }_{gg}^{(3)}(N)$ of the twist-two gluon operator of arbitrary Lorentz spin $N$ in the quark flavor singlet sector of a general gauge theory at four loops and construct its contribution proportional to $\zeta (3)$ in analytic form by applying the Lenstra-Lenstra-Lovász algorithm t…

[Phys. Rev. Lett. 137, 081901] Published Mon Aug 17, 2026

The first evidence for the decay $B^{+}\to {\pi }^{+}{e}^{+}{e}^{-}$ is reported using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of $9{\mathrm{fb}}^{-1}$. A signal excess with a significance of $3.2\sigma$ is observed and the branching fr…

[Phys. Rev. Lett. 137, 071804] Published Fri Aug 14, 2026

A lattice QCD determination of the hadronic contribution to the running electromagnetic coupling at the $Z$-pole achieves 1.7% uncertainty, more than doubling phenomenological precision and meeting the FCC-ee target.

[Phys. Rev. Lett. 137, 071901] Published Thu Aug 13, 2026

Back-to-back jets produced during heavy-ion collisions reveal a plasma property predicted by quantum chromodynamics.

[Phys. Rev. Lett. 137, 071902] Published Thu Aug 13, 2026

We show that the tree-level spectrum of heavy particles can be directly extracted from the Wilson coefficients of the corresponding effective field theory at low energies. This procedure is exact when the number of resonances is finite and otherwise approximate. Our results are derived from a new cl…

[Phys. Rev. Lett. 137, 071601] Published Wed Aug 12, 2026

We apply a tag-and-probe method to precisely measure the absolute branching fraction of the decay ${\eta }_c\to \gamma \gamma$ with the BESIII experiment at BEPCII. Starting with a large initial sample of $(2712.4\pm 14.3)\times {10}^6\psi (3686)$ events, a sample of $0.16\times {10}^6{\eta }_c$ events is tagged via the golden channel $\psi (3686)\to {\pi }^0{h}_c$, $h_c\to \dots$

[Phys. Rev. Lett. 137, 071802] Published Wed Aug 12, 2026

We report the first searches for charged-lepton-flavor violation in decays of ${\chi }_{bJ}(1P)$ ($J=0$, 1, and 2) to a pair of charged leptons using 158 million $\mathrm{\Upsilon }(2S)$ decays collected with the Belle detector in $e^{+}{e}^{-}$ collisions at the KEKB collider. No significant signal is observed, and we set upper limits on t…

[Phys. Rev. Lett. 137, 071803] Published Wed Aug 12, 2026

This Letter reports on the first evidence of inclusive Higgs-boson production at high transverse momentum in the $b\overline{b}$ final state, reconstructed in a single large-radius jet. The results are based on proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider at a center-…

[Phys. Rev. Lett. 137, 071801] Published Tue Aug 11, 2026

Recent works reveal a simplicity in equal-time correlators absent from wave functions. We show that it follows from the fact that correlators are full spacetime integrals rather than half-spacetime integrals as for the wave function. This makes striking properties manifest: some wave function singul…

[Phys. Rev. Lett. 137, 061601] Published Fri Aug 07, 2026

We present the first lattice-QCD validation of multiple sum rules associated with quark-gluon decomposition of hadron mass by computing all relevant tensor components of the quark and gluon energy-momentum tensor matrix elements from first principles. We achieve this through nonperturbative renormal…

[Phys. Rev. Lett. 137, 061901] Published Fri Aug 07, 2026

Recent lattice evidence may suggest the chiral phase transition in QCD is second order for $N_f\ge 2$ massless flavors. We constrain conformal field theory (CFT) descriptions of a critical line in temperature $T$ and imaginary baryon chemical potential ${\theta }_B=i{\mu }_B/T$. An ’t Hooft anomaly at general ${\theta }_B$ constrains …

[Phys. Rev. Lett. 137, 061903] Published Thu Aug 06, 2026

The first search for the lepton-flavor violating decays $B^{+}\to {\pi }^{+}{\mu }^{\pm }{e}^{\mp }$ in proton-proton collisions is presented, using data collected by the LHCb experiment between 2011 and 2018, corresponding to an integrated luminosity of $9{\mathrm{fb}}^{-1}$. No significant signal is observed and an upper limit on the branching f…

[Phys. Rev. Lett. 137, 061802] Published Tue Aug 04, 2026

Spent nuclear fuel and shutdown nuclear reactors emit antineutrinos, which nuclear watchdogs could use for real-time monitoring of plants.

[Phys. Rev. Lett. 137, 061803] Published Tue Aug 04, 2026

A search for $CP$ violation in the ${\overline{B}}^0\to {\overline{K}}^{*0}{\mu }^{+}{\mu }^{-}$ decay is performed using proton-proton collision data collected by the LHCb experiment during Run 1 and Run 2, corresponding to an integrated luminosity of $8.4{\mathrm{fb}}^{-1}$. The analysis exploits the full angular distribution of the decay, providing sensitivity…

[Phys. Rev. Lett. 137, 061801] Published Mon Aug 03, 2026

A proof-of-concept global QCD fit finds the quark-gluon-quark interference comparable in size to polarized quark density contributions, which suggests a more quantum nature of the proton than assumed.

[Phys. Rev. Lett. 137, 061902] Published Mon Aug 03, 2026

We report a search for the rare decay $B^{+}\to K^{+}{\tau }^{+}{\tau }^{-}$ using $1.2\times {10}^9\mathbf{\Upsilon }(4S)$ mesons produced near threshold in electron-positron collisions and collected by the Belle and Belle II experiments. We fully reconstruct the hadronic decay of one $B$ meson produced in the $\mathrm{\Upsilon }(4S)\to B^{+}{B}^{-}$ decay, and search for $B^{\pm }\to K^{\pm }{\tau }^{+}{\tau }^{-}$ c…

[Phys. Rev. Lett. 137, 051805] Published Thu Jul 30, 2026

The consistent matching of short-distance contributions and hadronic matrix elements is crucial for precise predictions of weak processes involving hadrons. In this Letter, we address this point for charged-current processes involving two pions—pion $\beta$ decay ${\pi }^{\pm }\to {\pi }^0{e}^{\pm }{\nu }_e$ and hadronic $\tau$ decays ${\tau }^{\pm }\to {\pi }^{\pm }{\pi }^0{\nu }_{\tau }$—…

[Phys. Rev. Lett. 137, 051902] Published Thu Jul 30, 2026

We performed searches for $K_L\to {\pi }^0{\pi }^{0}X$ where $X$ may be an axionlike particle that promptly decays to two photons, and the first search for $K_L\to {\pi }^0{\pi }^0\gamma \gamma$ at the KOTO experiment using data taken in 2021. The search is performed for $X$ mass in the range of $160–220\mathrm{MeV}/c^2$. Three events were observed in the signa…

[Phys. Rev. Lett. 137, 051804] Published Wed Jul 29, 2026

The two-dimensional $\mathrm{O}(\mathrm{N})$ nonlinear sigma model (NLSM) is asymptotically free for $N>2$: it exhibits neither a nontrivial fixed point nor spontaneous symmetry breaking. Here, we show that a nontrivial fixed point generically does exist in the complex coupling plane and is described by a complex conf…

[Phys. Rev. Lett. 137, 051601] Published Tue Jul 28, 2026

In this Letter, we study pole skipping in nonmaximally quantum chaotic systems. Using Rindler conformal field theories and the large-$q$ Sachdev-Ye-Kitaev chain as illustrative examples, we argue that the pole skipping points of few-body operators organize into trajectories in the complex frequency-mo…

[Phys. Rev. Lett. 137, 051602] Published Tue Jul 28, 2026

A search for the rare decay $B^{+}\to \overline{\mathrm{\Lambda }}p{\mu }^{+}{\mu }^{-}$ is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of $\sqrt{s}=13\mathrm{TeV}$, corresponding to an integrated luminosity of $5.4{\mathrm{fb}}^{-1}$. An excess of events is found with respect to the background-only expectation, with a…

[Phys. Rev. Lett. 137, 051801] Published Tue Jul 28, 2026

In a search for potential signals of neutron ($n$) to mirror-neutron $(n^{\prime })$ oscillations, a collaboration centered at the Paul Scherrer Institute investigated the remaining parameter space claimed by anomalies with a dedicated high-sensitivity apparatus. An elaborate magnetic-field-mapping analysis and …

[Phys. Rev. Lett. 137, 051802] Published Tue Jul 28, 2026

Muon-electron universality is tested in $B^0\to K^{*0}{\ell }^{+}{\ell }^{-}$ decays, in the dilepton-invariant-mass region above the $\psi (2S)$ resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrate…

[Phys. Rev. Lett. 137, 051803] Published Tue Jul 28, 2026

We measured the invariant mass of the ${\eta }^{\prime }(958)$ meson through the ${\eta }^{\prime }\to \gamma \gamma$ decay channel to search for possible character change of ${\eta }^{\prime }$ in a nuclear medium. The measured invariant-mass spectra were analyzed by fitting realistic spectral functions. An enhancement was observed in the lower tail of the ${\eta }^{\prime }$ ma…

[Phys. Rev. Lett. 137, 051901] Published Mon Jul 27, 2026

A bootstrap extremization principle selects the linear Regge spectrum, with the graviton pole uniquely fixing the trajectory in gravitational theories.

[Phys. Rev. Lett. 137, 041603] Published Fri Jul 24, 2026

We obtain a form of the local thermodynamic equilibrium density operator, which is invariant under pseudogauge transformations of the stress-energy and the spin tensors. This operator is an excellent candidate to describe the dynamics of a system that is assumed to achieve local equilibrium from a p…

[Phys. Rev. Lett. 137, 041602] Published Thu Jul 23, 2026

We consider the Polyakov loop correlator in the confining phase of large $N$ Yang-Mills theory in three and four dimensions. It can be computed by summing over the exchange of closed flux tubes winding around the thermal cycle. At short separations, the leading divergence is controlled by perturbation…

[Phys. Rev. Lett. 137, 041601] Published Mon Jul 20, 2026

BESIII collaboration performs the first search for a sub-GeV dark scalar in $\eta \to {\pi }^{0}S$ decays using over 10 billion $J/\psi$ events, observing no signal.

[Phys. Rev. Lett. 137, 031804] Published Thu Jul 16, 2026

The LHCb collaboration has observed time-dependent $CP$ violation in a new hadronic $B$ meson decay.

[Phys. Rev. Lett. 137, 031803] Published Wed Jul 15, 2026

Custodial naturalness is a recently introduced idea that combines conformal and scalar sector custodial symmetry to address the electroweak (EW) scale hierarchy problem of the standard model (SM). We introduce a new model that realizes custodial naturalness without extension of the SM gauge group. T…

[Phys. Rev. Lett. 137, 031801] Published Tue Jul 14, 2026

We have performed hyperfine spectroscopy of two transitions in ground-state deuterium and searched for violations of $CPT$ and Lorentz symmetry that would manifest as sidereal variations of the observed transition frequencies. Several nonrelativistic proton coefficients of the Standard-Model extension…

[Phys. Rev. Lett. 137, 031802] Published Tue Jul 14, 2026

We report an experimental investigation of the reactions $\overline{n}p\to 2{\pi }^{+}{\pi }^{-}$, $\overline{n}p\to 2{\pi }^{+}{\pi }^{-}{\pi }^0$, and $\overline{n}p\to 2{\pi }^{+}{\pi }^{-}2{\pi }^0$ using $(10.087\pm 0.044)\times {10}^{9}J/\psi$ events collected with the BESIII detector at the BEPCII storage ring. The antineutron ($\overline{n}$) is produced in the decay $J/\psi \to p{\pi }^{-}\overline{n}$ with studied momentum from 200 to $1174\mathrm{MeV}/c$,…

[Phys. Rev. Lett. 137, 031902] Published Tue Jul 14, 2026

We investigate the charge-charge correlation (QQC) in electron-positron annihilation as a probe of charge dynamics in quantum chromodynamics. While generally divergent beyond leading order, we show that the QQC is infrared and collinear safe in the back-to-back limit, a property that we dub leading-…

[Phys. Rev. Lett. 137, 031901] Published Mon Jul 13, 2026

We report a follow-up axion haloscope search near 1.036 GHz that completes and extends our previous work [Ahn et al. Phys. Rev. X 14, 031023 (2024)], in which a portion of the HEMT-based data could not be analyzed due to unrecorded experimental information. While recovering this dataset, we identifi…

[Phys. Rev. Lett. 137, 021803] Published Fri Jul 10, 2026

Decades-old experiments have now been enlisted to set new bounds on the properties of a hypothetical particle that bears a tiny fraction of the electron’s charge.

[Phys. Rev. Lett. 137, 021804] Published Fri Jul 10, 2026

We reexamine the large $N$ limit of $\mathrm{SU}(N)$ symmetric quantum mechanics of a Hermitian matrix whose singlet sector is well known to be exactly solvable via free fermions. When the Fermi level approaches a maximum of the potential, there is critical behavior corresponding to string theory in two dimensio…

[Phys. Rev. Lett. 137, 021603] Published Wed Jul 08, 2026

Does a new measurement of a rare decay of the neutral $B$ meson portend new physics?

[Phys. Rev. Lett. 137, 021802] Published Wed Jul 08, 2026

The first observation of the doubly charmed baryon ${\mathrm{\Xi }}_{cc}^{+}$ is reported through its decay to the ${\mathrm{\Lambda }}_c^{+}{K}^{-}{\pi }^{+}$ final state, with a statistical significance exceeding seven standard deviations. The observation is made using proton-proton collision data collected in 2024 with the LHCb Run 3 detector at a center…

[Phys. Rev. Lett. 137, 021902] Published Wed Jul 08, 2026

We present a worldsheet action that reproduces a class of dual resonance amplitudes discussed in the literature, which generalize the Veneziano amplitude for open strings. Our proposal builds on the chiral composite linear dilaton introduced recently. We further compute higher-point extensions and c…

[Phys. Rev. Lett. 137, 021601] Published Tue Jul 07, 2026

We define a black hole state in a spin chain by studying thermal correlators in holography. Focusing on the Heisenberg model we investigate the thermal and complexity properties of the black hole state by evaluating its entanglement entropy, emptiness formation probability, and Krylov complexity. Th…

[Phys. Rev. Lett. 137, 021602] Published Tue Jul 07, 2026

A combination of measurements of the $CP$ properties of Higgs boson interactions with electroweak gauge bosons is presented, using $140{\mathrm{fb}}^{-1}$ of proton-proton collisions at $\sqrt{s}=13\mathrm{TeV}$ recorded by the ATLAS detector. Results from vector boson fusion $H\to \tau \tau /W{W}^{*}/\gamma \gamma$, inclusive $H\to Z{Z}^{*}$, and $WH,H\to b\overline{b}$ channels are…

[Phys. Rev. Lett. 137, 021801] Published Mon Jul 06, 2026

The production of a top-quark pair, the heaviest known elementary particle, in association with a light jet is a key process for studying the properties of the standard model of particle physics. Due to its significance as a signal process with considerable sensitivity to the top-quark mass and as a…

[Phys. Rev. Lett. 137, 021901] Published Mon Jul 06, 2026

Using the data sample of $2.7\times {10}^9\psi (3686)$ events collected with the BESIII detector at the BEPCII collider, we present an observation of the $\mathrm{\Xi }(1530{)}^0$ polarization in the decay $\psi (3686)\to \mathrm{\Xi }(1530{)}^0\overline{\mathrm{\Xi }}(1530{)}^0$ with a significance larger than $20\sigma$ compared with all other tested hypotheses. The helicity amplit…

[Phys. Rev. Lett. 137, 011901] Published Mon Jun 29, 2026

We numerically solve the conjectured quantum spectral curve for strings on ${\mathrm{AdS}}_3\times {\mathrm{S}}^3\times {\mathrm{T}}^4$ with Ramond-Ramond charge from weak to strong coupling. At strong coupling, the spectrum organizes into flat-space string mass levels with universal square-root scaling in the string tension at leading order, and …

[Phys. Rev. Lett. 136, 251603] Published Thu Jun 25, 2026

We propose a renormalization group flow equation for a functional that generates $S$-matrix elements and which captures similarities to the well-known Wetterich and Polchinski equations. While the latter ones, respectively, involve the effective action and Schwinger functional, which are genuine off-s…

[Phys. Rev. Lett. 136, 251602] Published Wed Jun 24, 2026

We propose a dark matter direct-detection strategy using charged particle decays at accelerator-based experiments. If ultralight $(m_{\varphi }\ll \mathrm{eV})$ dark matter has a misalignment abundance, its local field oscillates in time at a frequency set by its mass. If it also couples to flavor-changing neutral currents…

[Phys. Rev. Lett. 136, 251801] Published Tue Jun 23, 2026

Using $(10087\pm 44)\times {10}^{6}J/\psi$ events collected with the BESIII detector, a full angular analysis is carried out on the process $J/\psi \to \mathrm{\Lambda }\overline{\mathrm{\Lambda }}\to n{\pi }^0\overline{p}{\pi }^{+}+\mathrm{c}.\mathrm{c}$. The decay parameters ${\alpha }_0$ for $\mathrm{\Lambda }\to n{\pi }^0$ and ${\overline{\alpha }}_0$ for $\overline{\mathrm{\Lambda }}\to \overline{n}{\pi }^0$ are measured to be $0.668\pm 0.007\pm 0.002$ and $-0.677\pm 0.007\pm 0.003$, respectively, yielding the most precise …

[Phys. Rev. Lett. 136, 251802] Published Tue Jun 23, 2026

We compute for the first time the production rate for four jets in electron-positron annihilation at next-to-next-to-leading order. Our calculation exhibits the highest final-state jet multiplicity considered at this perturbative accuracy to date. The cancellation of infrared singularities is achiev…

[Phys. Rev. Lett. 136, 251901] Published Tue Jun 23, 2026

Based on $334{\mathrm{pb}}^{-1}$ of photoproduction data collected with the GlueX detector at Jefferson Lab, we have measured for the first time the cross section of the exclusive reaction $\gamma +p\to \varphi (1020){\pi }^{+}{\pi }^{-}p$ by reconstructing the final state $K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}p$ produced with a photon beam of energies between 8.0 and 11.6 GeV…

[Phys. Rev. Lett. 136, 251902] Published Tue Jun 23, 2026

The production of identified hadrons inside jets in $e^{+}{e}^{-}$ annihilation allows for detailed studies of parton-to-hadron fragmentation functions in a clean environment. We compute hadron-in-jets production cross sections for $e^{+}{e}^{-}\to 2\text{jets}$ and $e^{+}{e}^{-}\to 3\text{jets}$ to next-to-next-to-leading order (NNLO) in pertu…

[Phys. Rev. Lett. 136, 251903] Published Tue Jun 23, 2026

Using a “bootstrap” approach, researchers show that a small set of assumptions may naturally lead to a string-theory description of certain high-energy processes.

[Phys. Rev. Lett. 136, 251601] Published Mon Jun 22, 2026

We compute for the first time baryon number violation at zero temperature from Higgs bubble collisions and find that it can be of the same order as that from thermal sphalerons in the symmetric phase at electroweak temperatures. We study the dependence of the rate of Chern-Simons number transitions …

[Phys. Rev. Lett. 136, 241803] Published Thu Jun 18, 2026

Scalar-mediated interactions may exist among neutrinos, dark matter particles, or between the two. Double $\beta$-decay experiments provide a powerful tool to probe such exotic interactions. Using ${}^{136}\mathrm{Xe}$ double $\beta$-decay data from PandaX-4T, we perform the first direct spectral search in the energy range of …

[Phys. Rev. Lett. 136, 241802] Published Wed Jun 17, 2026

Does a conformal manifold imply the existence of exactly marginal operators? We answer this question affirmatively under the assumption that there exists a conformal interface with certain properties connecting nearby conformal field theories. We show that the exactly marginal operator that connects…

[Phys. Rev. Lett. 136, 241603] Published Tue Jun 16, 2026

Permanent electric dipole moments (EDMs) provide a sensitive probe of physics beyond the standard model and are directly linked to additional sources of $CP$ violation that could explain the matter-antimatter asymmetry of the Universe. EDM measurements of charged particles in storage rings rely on det…

[Phys. Rev. Lett. 136, 241801] Published Tue Jun 16, 2026

An exotic meson’s photon-emitting decay opens a window into the particle’s long-debated structure.

[Phys. Rev. Lett. 136, 241901] Published Tue Jun 16, 2026

In this Letter, we initiate a systematic study of the $n$-point correlation functions (CFs) in gauge theories in the sequential light-cone (SLC) limit. Focusing on QCD, we formulate a factorization theorem for the CF of four vector currents in this limit using tools from soft-collinear effective field…

[Phys. Rev. Lett. 136, 241601] Published Mon Jun 15, 2026

We report on three improvements in the context of Feynman integral reduction and $ϵ$-factorized differential equations. First, we show that with a specific choice of prefactors, we trivialize the $ϵ$ dependence of the integration-by-parts identities. Second, we observe that with a specific choice of ord…

[Phys. Rev. Lett. 136, 241602] Published Mon Jun 15, 2026

We present a search for an invisible hidden-sector particle $X_{\mathrm{inv}}$, produced in $B^0\to {\overline{D}}^0{X}_{\mathrm{inv}}$ and $B^{\pm }\to h{X}_{\mathrm{inv}}$ decays, where $h={\pi }^{\pm }$, $K^{\pm }$, $D_s^{\pm }$, $p^{\pm }$. The search is performed using $e^{+}{e}^{-}$ collision data recorded with the Belle detector, corresponding to $711{\mathrm{fb}}^{-1}$. No significant signal is observed. We set 90% confide…

[Phys. Rev. Lett. 136, 231802] Published Fri Jun 12, 2026

The decay of a $b$ quark to a strange quark and a pair of leptons reveals the first indications of time-dependent $CP$ violation.

[Phys. Rev. Lett. 136, 231904] Published Fri Jun 12, 2026