We investigate cosmic censorship in anti–de Sitter space in holographic models in which the ground state is described by a good singularity. These include supersymmetric truncations of string/M theory, for which a positive-energy theorem holds. At the boundary, our solutions describe a boost-invariant fluid in which the temperature decreases monotonically with time. On the gravity side, they correspond to black-brane spacetimes with a receding horizon. In classical gravity, curvature invariants at the horizon grow without bound. In the full theory this regime may or may not be reached. In some cases it is avoided by a phase transition to a regular geometry. In others it is reached but the boundary hydrodynamic evolution can be continued, provided the equation of state at parametrically small energies is known. Both cases require the inclusion of finite-<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi></mrow></math> or finite-coupling effects.

Netherlands

Marc Aragonès Fontboté

Spain

David Mateos

Guillem Pérez Martín

CERN

Wilke van der Schee

Javier G. Subils

Cosmic Censorship in a Dual Collider

This paper presents the multiplicity of neutral and charged hadrons produced in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>90</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mi>c</mi></mrow></math> proton-carbon interactions from a dataset taken by the NA61/SHINE experiment in 2017. Particle identification via <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">d</mi><mi>E</mi><mo>/</mo><mi mathvariant="normal">d</mi><mi>x</mi></math> was performed for the charged hadrons <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>π</mi><mo>±</mo></msup></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>K</mi><mo>±</mo></msup></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>/</mo><mover accent="true"><mi>p</mi><mo stretchy="false">¯</mo></mover></math>; the neutral hadrons <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>K</mi><mi>S</mi><mn>0</mn></msubsup></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Λ</mi></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover></math> were identified via an invariant mass analysis of their decays to charged hadrons. Double-differential multiplicity results as a function of laboratory momentum and polar angle are presented for each particle species; these results provide vital constraints on the predicted neutrino beam flux for current and future long-baseline neutrino oscillation experiments.

Poland

H. Adhikary

P. Adrich

United States

K.K. Allison

Germany

N. Amin

E.V. Andronov

Norway

I.C. Arsene

M. Bajda

Y. Balkova

D. Battaglia

A. Bazgir

S. Bhosale

M. Bielewicz

France

A. Blondel

Bulgaria

M. Bogomilov

Y. Bondar

W. Bryliński

J. Brzychczyk

M. Buryakov

A.F. Camino

Y. Chandak

Serbia

M. Ćirković

Hungary

M. Csanád

J. Cybowska

T. Czopowicz

C. Dalmazzone

N. Davis

A. Dmitriev

P. von Doetinchem

W. Dominik

J. Dumarchez

R. Engel

G.A. Feofilov

L. Fields

Z. Fodor

Japan

M. Friend

M. Gaździcki

K.E. Gollwitzer

O. Golosov

V. Golovatyuk

M. Golubeva

K. Grebieszkow

F. Guber

P.G. Hurh

S. Ilieva

A. Ivashkin

A. Izvestnyy

N. Karpushkin

M. Kiełbowicz

V.A. Kireyeu

R. Kolesnikov

D. Kolev

Y. Koshio

S. Kowalski

B. Kozłowski

A. Krasnoperov

W. Kucewicz

M. Kuchowicz

M. Kuich

A. Kurepin

A. László

M. Lewicki

G. Lykasov

V.V. Lyubushkin

M. Maćkowiak-Pawłowska

A. Makhnev

B. Maksiak

A.I. Malakhov

A. Marcinek

A.D. Marino

H.J. Mathes

T. Matulewicz

V. Matveev

G.L. Melkumov

A. Merzlaya

Ł. Mik

S. Morozov

Y. Nagai

T. Nakadaira

M. Naskręt

S. Nishimori

A. Olivier

V. Ozvenchuk

O. Panova

V. Paolone

O. Petukhov

I. Pidhurskyi

R. Płaneta

P. Podlaski

B.A. Popov

B. Pórfy

D.S. Prokhorova

D. Pszczel

S. Puławski

R. Renfordt

L. Ren

V.Z. Reyna Ortiz

D. Röhrich

E. Rondio

M. Roth

Ł. Rozpłochowski

Measurements of hadron production in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>90</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><mrow><mi>c</mi></mrow></mrow></math> proton-carbon interactions

The recent increase in computational resources and data availability has led to a significant rise in the use of machine learning (ML) techniques for data analysis in physics. However, the application of ML methods to solve differential equations capable of describing even complex physical systems is not yet fully widespread in theoretical high-energy physics. Hamiltonian neural networks (HNNs) are tools that minimize a loss function defined to solve Hamilton equations of motion. In this work, we implement several HNNs trained to solve, with high accuracy, the Hamilton equations for a massless probe moving inside a smooth and horizonless geometry known as a D1-D5 circular fuzzball. We study both planar (equatorial) and nonplanar geodesics in different regimes according to the impact parameter, some of which are unstable. Our findings suggest that HNNs could eventually replace standard numerical integrators, as they are equally accurate but more reliable in critical situations.

Italy

Andrea Cipriani

Alessandro De Santis

China

Giorgio Di Russo

Alfredo Grillo

Luca Tabarroni

Hamiltonian neural network approach to fuzzball geodesics

The response of liquid xenon to various types of ionizing radiation has been extensively studied theoretically and experimentally. Recent progress in direct detection dark matter experiments highlights the significance of composite events, where multiple particles interact with xenon simultaneously and generate overlapping ionization signatures. In these events, recombination of electrons and ions associated with different primary particles leads to additional suppression of the ionization signal, introducing a new source of uncertainty in dark matter searches and Migdal effect studies. We developed a model to estimate the recombination enhancement for overlapping low-energy particle interactions. This method, which has minimal dependence on xenon microphysics and is primarily driven by existing experimental data, yields predictions that are consistent with available measurements of composite interactions. Furthermore, we demonstrate that the model predictions are robust against xenon microphysics assumptions.

J. Xu

J. Kim

B. Lenardo

C.E. Dahl

R.L. Mannino

G.M. Blockinger

C.A. Hardy

D. Adams

C.S. Amarasinghe

J. Bang

A.C. Vaitkus

C. Ding

W.H. Lippincott

M. Szydagis

C. Levy

R.J. Gaitskell

R. Essig

Electron-ion recombination in composite interactions in liquid xenon

We derive the full system of canonical differential equations for all planar two-loop massless six-particle master integrals and determine analytically the boundary conditions. This fully specifies the solutions, which may be written as Chen iterated integrals. We argue that this is sufficient information for evaluating any scattering amplitude in four dimensions up to the finite part. We support this claim by reducing, for the most complicated integral topologies, integrals with typical Yang-Mills numerators. We use the analytic solutions to the differential equations, together with dihedral symmetry, to provide the full solution space relevant for two-loop six-particle computations. This includes the relevant function alphabet, as well as the independent set of iterated integrals up to weight four. We also provide the answer for all master integrals in terms of iterated integrals that can be readily evaluated numerically. As a proof of concept, we provide a numerical implementation that evaluates the integrals in part of the Euclidean region and validate this against numerical evaluation of the Feynman integrals. Our result removes the bottleneck of the Feynman integral evaluation, paving the way for future analytic evaluations of six-particle scattering amplitudes.

Johannes Henn

Antonela Matijašić

Julian Miczajka

Tiziano Peraro

Yingxuan Xu

Yang Zhang

Complete Function Space for Planar Two-Loop Six-Particle Scattering Amplitudes

Using a sample of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><mn>10087</mn><mo>±</mo><mn>44</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mn>6</mn></msup><mtext> </mtext><mtext> </mtext><mi>J</mi><mo>/</mo><mi>ψ</mi></math> events collected with the BESIII detector at the BEPCII collider, the first evidence for the doubly Okubo-Zweig-Iizuka (OZI)-suppressed decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>η</mi><mi>c</mi></msub><mo stretchy="false">→</mo><mi>ω</mi><mi>ϕ</mi></math> is reported with a significance of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>4.0</mn><mi>σ</mi></mrow></math>. The branching fraction of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>η</mi><mi>c</mi></msub><mo stretchy="false">→</mo><mi>ω</mi><mi>ϕ</mi></math> is measured to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><msub><mi>η</mi><mi>c</mi></msub><mo stretchy="false">→</mo><mi>ω</mi><mi>ϕ</mi><mo stretchy="false">)</mo><mo>=</mo><mspace linebreak="goodbreak"></mspace><mo stretchy="false">(</mo><mn>3.86</mn><mo>±</mo><mn>0.92</mn><mo>±</mo><mn>0.62</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>5</mn></mrow></msup></math>, where the first uncertainty is statistical and the second is systematic. This result provides valuable insights into the underlying mechanisms of charmonium decays, particularly for processes such as <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>η</mi><mi>c</mi></msub><mo stretchy="false">→</mo><mi>V</mi><mi>V</mi></math> (where <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>V</mi></math> represents a vector meson).

M. Ablikim

Russia

M.N. Achasov

Sweden

P. Adlarson

X.C. Ai

R. Aliberti

A. Amoroso

Q. An

Y. Bai

JINR

O. Bakina

Y. Ban

H.R. Bao

V. Batozskaya

Mongolia

K. Begzsuren

N. Berger

M. Berlowski

M. Bertani

D. Bettoni

F. Bianchi

E. Bianco

A. Bortone

I. Boyko

R.A. Briere

A. Brueggemann

H. Cai

M.H. Cai

X. Cai

A. Calcaterra

G.F. Cao

N. Cao

Türkiye

S.A. Cetin

X.Y. Chai

J.F. Chang

G.R. Che

Y.Z. Che

G. Chelkov

C. Chen

C.H. Chen

Chao Chen

Evidence of doubly OZI-suppressed decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>η</mi><mi>c</mi></msub><mo stretchy="false">→</mo><mi>ω</mi><mi>ϕ</mi></math> in the radiative decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>J</mi><mo>/</mo><mi>ψ</mi><mo stretchy="false">→</mo><mi>γ</mi><msub><mi>η</mi><mi>c</mi></msub></math>