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Multi-parton interactions are a fascinating phenomenon that occur in almost every high-energy hadron--hadron collision, yet are remarkably difficult to study quantitatively. In this letter we present a strategy to optimally disentangle…

High Energy Physics - Phenomenology · Physics 2024-05-20 Jeppe R. Andersen , Pier Francesco Monni , Luca Rottoli , Gavin P. Salam , Alba Soto-Ontoso

We study the multiple scattering effects on inclusive particle production in p+A and $\gamma$+A collisions. Specifically, we concentrate on the region where the parton momentum fraction in the nucleus $x\sim {\cal O}(1)$ and incoherent…

High Energy Physics - Phenomenology · Physics 2013-09-17 Zhong-Bo Kang , Ivan Vitev , Hongxi Xing

We present a new parton model approach for hadron-hadron interactions and, in particular, for the initial stage of nuclear collisions at very high energies (RHIC, LHC and beyond). The most important aspect of our approach is a…

High Energy Physics - Phenomenology · Physics 2009-10-31 H. J. Drescher , M. Hladik , S. Ostapchenko , T. Pierog , K. Werner

Recent multiplicity-dependent analyses of pp and p--Pb collision data have revealed that particle production shares similar features with that in heavy-ion collisions. Studies using resonances could help to understand the possible onset of…

Nuclear Experiment · Physics 2023-03-22 A. Rosano

Minijet production in ultra-relativistic heavy-ion collisions is discussed by taking semi-hard parton rescatterings explicitly into account. At both RHIC and LHC energies we find sizable effects on global characteristics of the nuclear…

High Energy Physics - Phenomenology · Physics 2007-05-23 A. Accardi

We show that particle species dependence of enhanced hadron production at intermediate transverse momentum (p_{T}) for d+Au collisions at RHIC can be understood in terms of the hadronic rescatterings in the final state. A multiphase…

Nuclear Theory · Physics 2012-04-17 Xiaoping Zhang , Jinhui Chen , Zhongzhou Ren , N. Xu , Zhangbu Xu , Qiang Zheng , Xianglei Zhu

We present additions to the MARTINI event generator for examining heavy quarks and quarkonia in heavy-ion collisions. All stages of a heavy-ion collision affect the observables associated with heavy quarks: the initial phase space of the…

Nuclear Theory · Physics 2013-05-30 Clint Young , Bjoern Schenke , Sangyong Jeon , Charles Gale

Hadron-nucleus collisions at LHC energies are studied by including explicitly semi-hard parton rescatterings in the collision dynamics. Under rather general conditions, we obtain explicit formulae for the semi-hard cross-section and the…

High Energy Physics - Phenomenology · Physics 2009-11-07 A. Accardi , D. Treleani

The problem of forward production of hadrons in heavy-ion collision at RHIC is revisited with modification of the theoretical treatment on the one hand and with the use of new data on the other. The basic formalism for hadronization remains…

Nuclear Theory · Physics 2008-11-26 Rudolph C. Hwa , Li-Lin Zhu

The PYTHIA Monte Carlo (PMC) has been applied broadly to simulations of high-energy $p$-$p$ and $p$-$\bar p$ collisions. The PMC is based on several assumptions, such as that most hadrons result from jet production (multiple parton…

High Energy Physics - Phenomenology · Physics 2019-05-22 Thomas A. Trainor

Data on hadron multiplicities from inelastic proton-proton interactions in the energy range of the NICA collider have been compiled. The compilation includes recent results from the NA61/SHINE and NA49 experiments at the CERN SPS…

Nuclear Experiment · Physics 2020-04-22 V. Kolesnikov , V. Kireyeu , V. Lenivenko , A. Mudrokh , K. Shtejer , D. Zinchenko , E. Bratkovskaya

Hadron production is investigated in proton-proton (pp) collisions at \surds = 7 TeV LHC energy - especially outside the cones of identified jets. We improved the original CDF definition of underlying event and introduce surrounding…

High Energy Physics - Phenomenology · Physics 2011-09-06 A. G. Agócs , G. G. Barnaföldi , P. Lévai

We present a new model for building up complete exclusive hadronic final states in high energy nucleus collisions. It is a direct extrapolation of high energy pp collisions (as described by PYTHIA), and thus bridges a large part of the…

High Energy Physics - Phenomenology · Physics 2018-10-29 Christian Bierlich , Gösta Gustafson , Leif Lönnblad , Harsh Shah

Event generators like Pythia play an important role in physics studies at the Large Hadron Collider (LHC). While they make accurate predictions in the central region, i.e. at pseudorapidities $\eta<5$, a disagreement between Pythia and…

High Energy Physics - Phenomenology · Physics 2023-09-18 Max Fieg , Felix Kling , Holger Schulz , Torbjörn Sjöstrand

Forward-backward correlation in pp collisions is studied in an approach that emphasizes the partonic scattering angles and circumvents the intractable problem related to the transverse momenta that are low. Assuming the back-to-back…

Nuclear Theory · Physics 2007-05-23 Rudolph C. Hwa , C. B. Yang

We report the predictions of different Monte Carlo event generators including HIJING, Pythia, and QGSJETII in comparison with the experimental data measured by the CMS Collaboration at CERN in proton-proton ($pp$) collisions at…

High Energy Physics - Phenomenology · Physics 2022-04-25 Pei-Pin Yang , Muhammad Ajaz , Muhammad Waqas , Fu-Hu Liu , Mais K. Suleymanov

In this paper we study ATLAS results on underlying event in pp collisions at $\sqrt{s}$=0.9, 7 and 13 TeV. We show that the center-of-mass energy dependences of the charged-particle production sensitive to the underlying event ("transverse"…

High Energy Physics - Experiment · Physics 2017-12-27 Antonio Ortiz , Lizardo Valencia Palomo

Recombination is a hadronization process that converts partons to hadrons at late time, but the description has no quantitative significance without some meaningful input on the parton distributions at earlier time. Thus observations of…

Nuclear Theory · Physics 2011-04-08 Rudolph C. Hwa

Rope Hadronization is a model extending the Lund string hadronization model to describe environments with many overlapping strings, such as high multiplicity pp collisions or $AA$ collisions. Including effects of Rope Hadronization…

Nuclear Theory · Physics 2018-03-14 Christian Bierlich

In the framework of a multi-phase transport model (AMPT) with both partonic and hadronic interactions, azimuthal correlations between trigger particles and associated scattering particles have been studied by the mixing-event technique. The…

Nuclear Theory · Physics 2008-11-26 G. L. Ma , S. Zhang , Y. G. Ma , H. Z. Huang , X. Z. Cai , J. H. Chen , Z. J. He , J. L. Long , W. Q. Shen , X. H. Shi , J. X. Zuo