Hadronic resonances, with lifetimes of a few <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>fm</mi><mo>/</mo><mi>c</mi></mrow></math> are key tools for studying the hadronic phase in high-energy collisions. This work investigates resonance production in pp collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13.6</mn><mspace width="0.28em"></mspace><mi>TeV</mi></mrow></math> and in Pb-Pb 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>5.36</mn><mspace width="0.28em"></mspace><mi>TeV</mi></mrow></math> using the EPOS4 model. The EPOS4 model provides the capability of switching the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) ON or OFF, allowing the study of final-state hadronic interactions in the hadronic phase. Although this study is primarily focused on understanding the production of hadronic resonances, we also investigate the production of strange and nonstrange hadrons in relation to rescattering, regeneration, baryon-to-meson production, and strangeness enhancement, using transverse momentum (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></math>) spectra and particle ratios. Rescattering effects and strangeness enhancement play an important role in the low-<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></math> region, where soft, nonperturbative processes dominate particle production. At intermediate <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></math>, the baryon-to-meson yield ratios show an enhancement, and the strong mass-dependent radial flow observed for baryons in the most central Pb-Pb collisions reflects the interplay between hadronization dynamics and collective effects. The average <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></math> scaled with the reduced hadron mass (i.e., the mass divided by the number of valence quarks) is examined, revealing a deviation from a linear trend for short-lived resonances, attributed to hadronic phase effects. By analyzing the yield ratios of short-lived resonances to stable hadrons in pp and Pb-Pb collisions, the time duration (<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>τ</mi></math>) of the hadronic phase as a function of average charged multiplicity is estimated. The results show that <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>τ</mi></math> increases with increasing multiplicity and system size, also exhibiting a nonzero value for high-multiplicity pp collisions. It is found that the production of baryons such as nonstrange (<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>p</mi></math>), strange (<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Λ</mi></math>), and multistrange (<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Ξ</mi></math>, <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Ω</mi></math>) in the most central Pb-Pb collisions is influenced by competing processes of strangeness enhancement and baryon-antibaryon annihilation. Comparing these findings with measurements at energies available at the CERN Large Hadron Collider offers valuable insights into the underlying dynamics of the hadronic phase and their production dynamics.

India

Vikash Sumberia

France

Dukhishyam Mallick

Sanjeev Singh Sambyal

Nasir Mehdi Malik

Examining hadronic resonance dynamics at energies available at the CERN Large Hadron Collider: Insights from EPOS4

We present the implementation of next-to-next-to-leading order (NNLO) QCD fully-differential corrections within the G framework, for both colour-singlet and colour-singlet+jet processes at hadron colliders, by employing a nonlocal subtraction approach. In particular, we discuss the implementation details and the challenges that arise when utilizing a dynamical infrared cutoff parameter. Additionally, we combine the subtraction with the projection-to-Born method in order to include fiducial power corrections. As a test case, we provide predictions for Drell-Yan and $\textit{Z}$+jet production at the LHC, using $\textit{N}$-jettiness as resolution variable. We validate the NNLO corrections of G against finding excellent agreement. Finally, we discuss how to extend our method to calculate the N LO QCD fully-differential corrections to colour-singlet production at hadron colliders.

Italy

Simone Alioli

Switzerland

Georgios Billis

Austria

Alessandro Broggio

Giovanni Stagnitto

NNLO predictions with nonlocal subtractions and fiducial power corrections in GENEVA

A generalization of the phenomenological blast-wave-Tsallis-power model, recently proposed by the author for the hadrons' transverse momentum (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math>) spectra measured at the CERN Large Hadron Collider (LHC), is developed to also describe the hadrons' <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math>-differential elliptic flow coefficients <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> in identical nuclei collisions of different centralities. The model describes well the available data on <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math> spectra and <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> for any <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math> of various particles, from pions to charmonia, in Pb-Pb 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></mrow></math> 2.76 and 5.02 TeV and in Xe-Xe 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></mrow></math> 5.44 TeV. Also, predictions for OO 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></mrow></math> 5.36 TeV are given. While the model is mainly targeting the energies available at the LHC, it also works at much lower energies available at the BNL Relativistic Heavy Ion Collider.

JINR

Smbat Grigoryan

Blast-wave-Tsallis-power model for <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi>T</mi></msub></math> spectra and elliptic flow <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> of hadrons in collisions of identical nuclei at energies available at the CERN Large Hadron Collider

In this manuscript we examine the high energy channeling radiation datasets from the CERN-NA63 experiment using ultrarelativistic synchrotron emission. To incorporate recoil, we examine the standard quasiclassical formalism as well as develop a formalism that includes the Unruh effect by utilizing a hyperbolic recoil acceleration, based on conservation of momentum, in the classical synchrotron trajectory. We also perform an asymptotic radiation timescale analysis that predicts a photon energy threshold, beyond which the Unruh effect dominates. We then compare the classical, quasiclassical, and Unruh synchrotron theories to the data. We find that above threshold, the Unruh effect saturates the spectrum of all datasets.

Germany

Morgan H. Lynch

Hyperbolic recoil and the Unruh effect at CERN-NA63

We present the implementation of the NNLO QCD corrections to double Higgs boson production at hadron colliders in G , matched to the parton shower. We include top-quark mass effects and the resummation of large logarithms of the zero-jettiness $$ {\mathcal{T}}_0 $$ , up to NNLL accuracy. This work extends our previous study, which was performed in the $\textit{m}$ → ∞ infinite top-quark mass approximation, providing a more realistic simulation framework for Higgs boson pair production. We validate our approach against NNLO predictions by M and assess the importance of mass effects comparing with our $\textit{m}$ → ∞ previous implementation.

Giulia Marinelli

Davide Napoletano

NNLO+PS double Higgs boson production with top-quark mass corrections in GENEVA

For the present work, we have used the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>HYDJET</mi><mo>+</mo><mo>+</mo></mrow></math> model to explore the production of pure multi-strange hadrons in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Pb</mi><mo>+</mo><mi>Pb</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>2.76</mn></mrow></math> TeV and <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>5.02</mn></mrow></math> TeV collision energies, respectively. We have performed simulations to investigate transverse momentum (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi>T</mi></msub></math>) spectra and elliptic flow (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math>) for <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>ϕ</mi></math> mesons and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Ω</mi></math> baryons, and compared the results both with the ALICE experimental data and available model predictions for selected central classes. Furthermore, we have calculated the nuclear modification factors (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mrow><mi>A</mi><mi>A</mi></mrow></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mrow><mi>C</mi><mi>P</mi></mrow></msub></math>), which provide a perception of jet quenching phenomena. Hence, our findings enable the study of the energy and system dependence of <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>ϕ</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Ω</mi></math> hadrons production over a wide range of ultrarelativistic collision energies. We also present the particle ratios (<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">Ω</mi><mo>/</mo><mi>ϕ</mi></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mover><mi mathvariant="normal">Ω</mi><mo>¯</mo></mover><mo>+</mo></msup><mo>/</mo><msup><mi mathvariant="normal">Ω</mi><mo>−</mo></msup></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">Ω</mi><mo>/</mo><mi>π</mi></mrow></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>ϕ</mi><mo>/</mo><mi>π</mi></mrow></math>), offering insights into the strangeness enhancement and chemical properties of the medium at both CERN Large Hadron Collider collision energies. Additionally, we also explore the predictions for the <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Ω</mi></math> baryon in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Pb</mi><mo>+</mo><mi>Pb</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>5.02</mn></mrow></math> TeV, focusing on <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mrow><mi>A</mi><mi>A</mi></mrow></msub></math>, <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mrow><mi>C</mi><mi>P</mi></mrow></msub></math>, and particle ratios within the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>HYDJET</mi><mo>+</mo><mo>+</mo></mrow></math> framework, offering insights into future measurements and particle dynamics in high-energy heavy-ion collisions.

Gauri Devi

B.K. Singh

Production of multistrange hadrons in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Pb</mi><mo>+</mo><mi>Pb</mi></mrow></math> collisions at energies available at the CERN Large Hadron Collider using the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>HYDJET</mi><mo>+</mo><mo>+</mo></mrow></math> model

In the present work, O-O 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>7</mn><mspace width="0.16em"></mspace><mi>TeV</mi></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>p</mi></math>-O 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>9.9</mn><mspace width="0.16em"></mspace><mi>TeV</mi></mrow></math> are studied using the <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal" mathsize="small">PYTHIA8</mi></math>/Angantyr model for heavy-ion collisions. The theoretically predicted <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math>-cluster structure of oxygen nucleus is implemented in the model to investigate the effect of the initial configuration of the oxygen nucleus on final state observables. The results obtained from the <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math>-cluster structure are compared with those obtained from Woods-Saxon nuclear charge density distribution. The Angantyr model simulation showed that the radial distribution of the oxygen nucleus in <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math>-cluster configuration is more compact in comparison to the Woods-Saxon distribution. The results on charged and identified particle pseudorapidity distribution are obtained in the two initial state configurations of the oxygen nucleus. The results demonstrated that the effect of initial geometrical configuration is more distinct in the noncentral collisions in comparison to the central collisions for both O-O and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>p</mi></math>-O collisions.

Deependra Sharma

Arpit Singh

Md. Samsul Islam

Basanta Nandi

Sadhana Dash

Effect of <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math> clusters on particle production in O-O and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>p</mi></math>-O collisions at energies available at the CERN Large Hadron Collider

The effect of electron-electron interaction on positron emission in supercritical collisions of highly charged ions is studied within the monopole approximation using the time-dependent density functional theory and time-dependent Hartree–Fock–Slater methods. Positron production probabilities and energy spectra are calculated for U–U, U–Cm, and Cm–Cm collision systems, considering both bare nuclei and highly charged ions with partially filled electron shells. The results indicate that the screening of the nuclear potential by electrons as well as Pauli blocking substantially reduce positron production and suppress the characteristic signatures of spontaneous vacuum decay, previously found in collisions of bare nuclei.

Russia

N.K. Dulaev

D.A. Telnov

R.V. Popov

V.M. Shabaev

Y.S. Kozhedub

China

X. Ma

I.A. Maltsev

A.D. Mironov

I.I. Tupitsyn

Effect of electron–electron interaction on pair production in supercritical collisions of highly charged ions * The calculations within the TDDFT approach were supported by the Russian Science Foundation (22-62-00004, https://rscf.ru/project/22-62-00004/). The calculations performed using the TDHFS method were supported by the Theoretical Physics and Mathematics Advancement Foundation 'BASIS' (23-1-1-54-3). The computations were conducted based on the HybriLIT heterogeneous computing platform (LIT, JINR)

This paper presents results on multiplicity fluctuations of positively and negatively charged hadrons as well as net-electric charge fluctuations measured in central Ar+Sc interactions at beam momenta 13$\textit{A}$, 19$\textit{A}$, 30$\textit{A}$, 40$\textit{A}$, 75$\textit{A}$, and 150 $$A\,\hbox {GeV}\!/\!c$$ . The fluctuation analysis is one of the tools to search for the predicted critical point of strongly interacting matter. Results are corrected for the experimental biases and quantified using cumulant ratios. In most instances, multiplicity and net-charge distributions appear narrower than the corresponding Poisson or Skellam distributions. Cumulant ratios are compared with the model predictions, which provide a qualitative description that aligns with observations for positively and negatively charged particles. The obtained results are also compared to earlier NA61/SHINE results from inelastic $\textit{p+p}$ interactions in the same analysis acceptance.

Poland

H. Adhikary

P. Adrich

United States

K. Allison

N. Amin

E. Andronov

Norway

I.C. Arsene

M. Bajda

Y. Balkova

D. Battaglia

A. Bazgir

S. Bhosale

M. Bielewicz

A. Blondel

Bulgaria

M. Bogomilov

Y. Bondar

W. Bryliński

J. Brzychczyk

M. Buryakov

A. Camino

Y. Chandak

Serbia

M. Ćirković

Hungary

M. Csanád

J. Cybowska

T. Czopowicz

C. Dalmazzone

N. Davis

A. Dmitriev

P. Doetinchem

W. Dominik

J. Dumarchez

R. Engel

G. Feofilov

L. Fields

Z. Fodor

Japan

M. Friend

M. Gaździcki

K. Gollwitzer

O. Golosov

V. Golovatyuk

M. Golubeva

K. Grebieszkow

F. Guber

P. Hurh

S. Ilieva

A. Ivashkin

N. Karpushkin

M. Kiełbowicz

V. Kireyeu

R. Kolesnikov

D. Kolev

Y. Koshio

S. Kowalski

B. Kozłowski

A. Krasnoperov

W. Kucewicz

M. Kuchowicz

M. Kuich

A. László

M. Lewicki

G. Lykasov

J. Lyon

V. Lyubushkin

M. Maćkowiak-Pawłowska

B. Maksiak

A. Malakhov

A. Marcinek

A. Marino

H.J. Mathes

T. Matulewicz

V. Matveev

G. Melkumov

A. Merzlaya

Ł.. Mik

S. Morozov

Y. Nagai

T. Nakadaira

S. Nishimori

A. Olivier

V. Ozvenchuk

O. Panova

V. Paolone

I. Pidhurskyi

R. Płaneta

P. Podlaski

B. Popov

B. Pórfy

D. Prokhorova

D. Pszczel

S. Puławski

L. Ren

V. Ortiz

D. Röhrich

M. Roth

Ł.. Rozpłochowski

M. Rumyantsev

Azerbaijan

A. Rustamov

M. Rybczynski

A. Rybicki

D. Rybka

K. Sakashita

Multiplicity and net-electric charge fluctuations in central Ar+Sc interactions at 13$\textit{A}$, 19$\textit{A}$, 30$\textit{A}$, 40$\textit{A}$, 75$\textit{A}$, and 150 $$A\,\hbox {GeV}\!/\!c$$ beam momenta measured by NA61/SHINE at the CERN SPS

Using the recombination model extended to the heavy flavor scenario, we investigate the production of charmed mesons, i.e., <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>D</mi><mn>0</mn></msup><mo>,</mo><mo> </mo><msubsup><mi>D</mi><mi>s</mi><mo>+</mo></msubsup></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math>, in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Pb</mi><mo>+</mo><mi>Pb</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>2.76</mn></mrow></math> and 5.02 TeV at the CERN Large Hadron Collider including the heavy flavor energy loss inside the hot and dense medium. Soft, semihard, and hard partons all play important roles in our model and are uniformly treated for all mesons produced. The resulting transverse momentum spectra and the second azimuthal harmonic <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> for these mesons are presented and compared with the available experimental data. The good agreement provides strong support again that the quark recombination mechanism is an effective model for hadronization in relativistic heavy-ion collisions.

Jingzong Zhang

Huanjing Gong

Hua Zheng

Wei Dai

Lilin Zhu

Spectra and azimuthal harmonic of charmed mesons in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Pb</mi><mo>+</mo><mi>Pb</mi></mrow></math> collisions at energies available at the CERN Large Hadron Collider