An investigation of high-transverse-momentum (high-<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi>T</mi></msub></math>) photon-triggered jets in proton-proton (<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>p</mi><mtext>−</mtext><mi>p</mi></mrow></math>) and ion-ion (<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>A</mi><mtext>−</mtext><mi>A</mi></mrow></math>) collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>0.2</mn></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>5.02</mn><mspace width="0.28em"></mspace><mi>TeV</mi></mrow></math> is carried out, using the multistage description of in-medium jet evolution. Monte Carlo simulations of hard scattering and energy loss in heavy-ion collisions are performed using parameters tuned in a previous study of the nuclear modification factor (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mrow><mi>A</mi><mi>A</mi></mrow></msub></math>) for inclusive jets and high-<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi>T</mi></msub></math> hadrons. We obtain a good reproduction of the experimental data for photon-triggered jet <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mrow><mi>A</mi><mi>A</mi></mrow></msub></math>, as measured by the ATLAS detector, the distribution of the ratio of jet to photon <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi>T</mi></msub></math> (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>X</mi><mrow><mi>J</mi><mi>γ</mi></mrow></msub></math>), measured by both CMS and ATLAS, and the photon-jet azimuthal correlation as measured by CMS. We obtain a moderate description of the photon-triggered jet <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>I</mi><mrow><mi>A</mi><mi>A</mi></mrow></msub></math>, as measured by STAR. A noticeable improvement in the comparison is observed when one goes beyond prompt photons and includes bremsstrahlung and decay photons, revealing their significance in certain kinematic regions, particularly at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>X</mi><mrow><mi>J</mi><mi>γ</mi></mrow></msub><mo>&gt;</mo><mn>1</mn></mrow></math>. Moreover, azimuthal angle correlations demonstrate a notable impact of bremsstrahlung photons on the distribution, emphasizing their role in accurately describing experimental results. This work highlights the success of the multistage model of jet modification to straightforwardly predict (this set of) photon-triggered jet observables. This comparison, along with the role played by bremsstrahlung photons, has important consequences on the inclusion of such observables in a future Bayesian analysis.

United States

C. Sirimanna

Japan

Y. Tachibana

A. Majumder

A. Angerami

R. Arora

S.A. Bass

Y. Chen

R. Datta

Canada

L. Du

R. Ehlers

Germany

H. Elfner

R.J. Fries

C. Gale

China

Y. He

B.V. Jacak

P.M. Jacobs

S. Jeon

Y. Ji

F. Jonas

L. Kasper

M. Kordell

A. Kumar

R. Kunnawalkam-Elayavalli

J. Latessa

Y.J. Lee

United Kingdom

R. Lemmon

Brazil

M. Luzum

S. Mak

A. Mankolli

C. Martin

H. Mehryar

T. Mengel

C. Nattrass

J. Norman

C. Parker

J.F. Paquet

J.H. Putschke

H. Roch

G. Roland

B. Schenke

L. Schwiebert

A. Sengupta

C. Shen

M. Singh

D. Soeder

R.A. Soltz

Finland

I. Soudi

J. Velkovska

G. Vujanovic

X.N. Wang

X. Wu

W. Zhao

Hard-photon-triggered jets in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>p</mi><mtext>−</mtext><mi>p</mi></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>A</mi><mtext>−</mtext><mi>A</mi></mrow></math> collisions

The strong-phase differences between $$ {D}^0\to {K}_{S(L)}^0{\pi}^{+}{\pi}^{-} $$ and $$ {\overline{D}}^0\to {K}_{S(L)}^0{\pi}^{+}{\pi}^{-} $$ decays are one of the most important inputs in measuring the $\textit{CP}$ violating angle $\textit{γ}$ via $\textit{B}$ → $\textit{DK}$ decays. They also play a key role in studies of charm mixing and indirect $\textit{CP}$ violation. In this paper, the strong-phase differences are determined in a model-independent way with quantum-correlated $\textit{D}$ - $$ {\overline{D}}^0 $$ decays from 7.93 fb of $\textit{e}$ $\textit{e}$ annihilation data at $$ \sqrt{s} $$ = 3$\textit{.}$773 GeV by the BESIII experiment. These results are the most precise to date and are expected to significantly reduce associated uncertainties in determining the $\textit{CP}$ violating angle $\textit{γ}$ and related charm mixing parameters.

M. Ablikim

Russia

M. Achasov

Sweden

P. Adlarson

X. Ai

R. Aliberti

Italy

A. Amoroso

Q. An

Y. Bai

O. Bakina

Y. Ban

H.R. Bao

Poland

V. Batozskaya

Mongolia

K. Begzsuren

N. Berger

M. Berlowski

M. Bertani

D. Bettoni

F. Bianchi

E. Bianco

A. Bortone

I. Boyko

R. Briere

A. Brueggemann

H. Cai

M. Cai

X. Cai

A. Calcaterra

G. Cao

N. Cao

Türkiye

S. Cetin

X. Chai

J. Chang

G. Che

Y. Che

C. Chen

Chao Chen

G. Chen

H. Chen

M. Chen

S. Chen

T. Chen

X. Chen

Z. Chen

South Korea

S. Choi

X. Chu

G. Cibinetto

F. Cossio

J. Cottee-Meldrum

J. Cui

H. Dai

J. Dai

A. Dbeyssi

R. Boer

D. Dedovich

C. Deng

Z. Deng

A. Denig

I. Denysenko

M. Destefanis

F. Mori

B. Ding

X. Ding

Y. Ding

J. Dong

L. Dong

M. Dong

X. Dong

M. Du

S. Du

Y. Duan

P. Egorov

G. Fan

J. Fan

Y. Fan

J. Fang

S. Fang

W. Fang

Y. Fang

R. Farinelli

L. Fava

F. Feldbauer

G. Felici

C. Feng

J. Feng

L. Feng

Q. Feng

Y. Feng

Updated model-independent measurement of the strong-phase differences between D

An amplitude analysis of the Cabibbo-favored decay $\textit{D}$ → $\textit{K}$ $\textit{π}$ $\textit{π}$ $\textit{π}$ is performed, using 7.93 fb of $\textit{e}$ $\textit{e}$ collision data collected with the BESIII detector at the center-of-mass energy of 3.773 GeV. The branching fractions of the intermediate processes are measured, with the dominant contribution $$ {D}^{+}\to {\overline{K}}^{\ast }{(892)}^0\rho {(770)}^{+} $$ observed to have a branching fraction of (4.35 $\textit{±}$ 0.07 $\textit{±}$ 0.17 )%. With the detection efficiency derived from the amplitude analysis, the absolute branching fraction of $\textit{D}$ $\textit{→ K}$ $\textit{π}$ $\textit{π}$ $\textit{π}$ is measured to be (6.35 $\textit{±}$ 0.04 $\textit{±}$ 0.07 )%.

O. Afedulidis

I. Balossino

G. Chelkov

Z. Duan

M. Fritsch

C. Fu

J. Fu

Y. Fu

H. Gao

Amplitude analysis and branching fraction measurement of the Cabibbo-favored decay $\textit{D}$

Using $\textit{e}$ $\textit{e}$ collision data at 13 center-of-mass energies ranging from 4.600 to 4.951 GeV collected with the BESIII detector, we conduct the first search for the $\textit{e}$ $\textit{e}$ → $$ {K}_S^0{K}_S^0{h}_c $$ process and investigate the resonance structures in the cross section line shape. No significant signal is observed, and the upper limits of the Born cross sections at each center-of-mass energy are presented. The ratio $$ \frac{\sigma \left({e}^{+}{e}^{-}\to {K}_S^0{K}_S^0{h}_c\right)}{\sigma \left({e}^{+}{e}^{-}\to {K}_S^0{K}_S^0J/\psi \right)} $$ is determined to be 0.15 $\textit{±}$ 0.22. This result indicates that if vector states exist in this energy region, their decay into $\textit{h}$ is significantly suppressed compared to decays into $\textit{J}$/$\textit{ψ}$.

Search for $\textit{e}$

The JETSCAPE Collaboration reports a new determination of the jet transport parameter <math xmlns="http://www.w3.org/1998/Math/MathML"><mover accent="true"><mi>q</mi><mo>̂</mo></mover></math> in the quark-gluon plasma (QGP) using Bayesian inference, incorporating all available inclusive hadron and jet yield suppression data measured in heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC). This multi-observable analysis extends the previously published JETSCAPE Bayesian inference determination of <math xmlns="http://www.w3.org/1998/Math/MathML"><mover accent="true"><mi>q</mi><mo>̂</mo></mover></math>, which was based solely on a selection of inclusive hadron suppression data. jetscape is a modular framework incorporating detailed dynamical models of QGP formation and evolution, and jet propagation and interaction in the QGP. Virtuality-dependent partonic energy loss in the QGP is modeled as a thermalized weakly coupled plasma, with parameters determined from Bayesian calibration using soft-sector observables. This Bayesian calibration of <math xmlns="http://www.w3.org/1998/Math/MathML"><mover accent="true"><mi>q</mi><mo>̂</mo></mover></math> utilizes active learning, a machine-learning approach, for efficient exploitation of computing resources. The experimental data included in this analysis span a broad range in collision energy and centrality, and in transverse momentum. In order to explore the systematic dependence of the extracted parameter posterior distributions, several different calibrations are reported, based on combined jet and hadron data; on jet or hadron data separately; and on restricted kinematic or centrality ranges of the jet and hadron data. Tension is observed in comparison of these variations, providing new insights into the physics of jet transport in the QGP and its theoretical formulation.

J. Mulligan

Bayesian inference analysis of jet quenching using inclusive jet and hadron suppression measurements

Based on (1$\textit{.}$0087 $\textit{±}$ 0$\textit{.}$0044) $\textit{×}$ 10 $\textit{J/ψ}$ events collected with the BESIII detector at the BEPCII $\textit{e}$ $\textit{e}$ storage ring, we search for $$ {K}_S^0 $$ invisible decays via the $\textit{J/ψ →}$ $$ \phi {K}_S^0{K}_S^0 $$ process. No significant signal is observed, and the upper limit of the branching fraction of these invisible decays is set at 8.4 $\textit{×}$ 10 at the 90% confidence level. This is the first experimental search for $$ {K}_S^0 $$ invisible decays.

Search for $$ {K}_S^0 $$ invisible decays

Based on a data sample of (10087 ± 44) × 10 $\textit{J}$/$\textit{ψ}$ events taken with the BESIII detector, we search for the flavor-changing neutral current charmonium decay $\textit{J}$/$\textit{ψ}$ → $\textit{D}$ $\textit{μ}$ $\textit{μ}$ + c.c. . No significant signal above the background is observed, and the upper limit on its branching fraction is set to be ℬ($\textit{J}$/$\textit{ψ}$ → $\textit{D}$ $\textit{μ}$ $\textit{μ}$ + c.c.) < 1.1 × 10 at the 90% confidence level. This marks the first search for a flavor-changing neutral current charmonium decay involving muons in the final state.

Search for the FCNC charmonium decay $\textit{J/ψ → D}$

We report the measurements of proton-deuteron ( <italic>p</italic>- <italic>d</italic>) and deuteron-deuteron ( <italic>d</italic>- <italic>d</italic>) correlation functions in Au+Au collisions at <math altimg='si1.svg'><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi mathvariant='normal'>NN</mi></mrow></msub></mrow></msqrt></math> = 3 GeV using fixed-target mode with the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). For the first time, the source size ( <math altimg='si2.svg'><msub><mrow><mi>R</mi></mrow><mrow><mi>G</mi></mrow></msub></math>), scattering length ( <math altimg='si3.svg'><msub><mrow><mi>f</mi></mrow><mrow><mn>0</mn></mrow></msub></math>), and effective range ( <math altimg='si4.svg'><msub><mrow><mi>d</mi></mrow><mrow><mn>0</mn></mrow></msub></math>) are extracted from the measured correlation functions with a simultaneous fit. The spin-averaged <math altimg='si3.svg'><msub><mrow><mi>f</mi></mrow><mrow><mn>0</mn></mrow></msub></math> for <italic>p</italic>- <italic>d</italic> and <italic>d</italic>- <italic>d</italic> interactions are determined to be -5.28 &#177; 0.11(stat.) &#177; 0.82(syst.) fm and -2.62 &#177; 0.02(stat.) &#177; 0.24(syst.) fm, respectively. The measured <italic>p</italic>- <italic>d</italic> interaction is consistent with theoretical calculations and low-energy scattering experiment results, demonstrating the feasibility of extracting interaction parameters using the femtoscopy technique. The reasonable agreement between the experimental data and the calculations from the transport model indicates that deuteron production in these collisions is primarily governed by nucleon coalescence.

Hungary

Czechia

India

Chile

Egypt

B.E. Aboona

J. Adam

L. Adamczyk

I. Aggarwal

M.M. Aggarwal

Z. Ahammed

E.C. Aschenauer

S. Aslam

J. Atchison

V. Bairathi

X. Bao

K. Barish

S. Behera

R. Bellwied

P. Bhagat

A. Bhasin

S. Bhatta

Light nuclei femtoscopy and baryon interactions in 3 GeV Au+Au collisions at RHIC