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Fluctuation and correlation observables are often measured using multi-particle correlation methods and therefore mutually probe the origins of genuine correlations present in multi-particle distribution functions. We investigate the common…

Nuclear Theory · Physics 2015-06-11 Sean Gavin , George Moschelli

The collective flow generated in relativistic heavy-ion collisions fluctuates from event to event. The fluctuations lead to a decorrelation of flow vectors measured in separate bins in phase space. These effects have been measured in…

Nuclear Theory · Physics 2024-02-21 Piotr Bozek , Hadi Mehrabpour

We present the first measurement of directed flow ($v_1$) at the Relativistic Heavy Ion Collider (RHIC). $v_1$ is found to be consistent with zero at pseudorapidities $\eta$ from -1.2 to 1.2, then rises to the level of a couple of percent…

Nuclear Experiment · Physics 2009-11-10 A. H. Tang , STAR Collaboration

We simulate the dynamics of Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC) with a hybrid model that treats the quark-gluon plasma macroscopically as an ideal fluid, but models the hadron resonance gas microscopically using a…

Nuclear Theory · Physics 2008-11-26 T. Hirano , U. W. Heinz , D. Kharzeev , R. Lacey , Y. Nara

The hydrodynamic (hydro) model applied to data from the relativistic heavy ion collider (RHIC) suggests that a dense QCD medium opaque to partons is formed in more-central Au-Au collisions. However, two-component spectrum analysis reveals a…

High Energy Physics - Phenomenology · Physics 2010-11-30 Thomas A. Trainor

We propose the measurement of the elliptic flow of hadron resonances at the Relativistic Heavy Ion Collider as a tool to probe the amount of hadronic final state interactions for resonances at intermediate and large transverse momenta. This…

Nuclear Theory · Physics 2008-11-26 C. Nonaka , M. Asakawa , S. A. Bass , R. J. Fries , B. Mueller

We argue that measurements of identified-particle elliptic flow in a wide energy range could shed light on the possible phase change in high-energy heavy ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC). When the…

Nuclear Theory · Physics 2009-09-28 J. Tian , J. H. Chen , Y. G. Ma , X. Z. Cai , F. Jin , G. L. Ma , S. Zhang , C. Zhong

Motivated by forthcoming experiments at RHIC and LHC, and results from SPS, a review is given of the present state of event-by-event fluctuations in ultrarelativistic heavy-ion collisions. Fluctuations in particle multiplicities, ratios,…

Nuclear Theory · Physics 2008-11-26 H. Heiselberg

We discuss the difference between the distribution of secondaries measured in terms of pseudorapidity and that using the correct rapidity variable. We show a set of examples obtained using Monte Carlo simulations. We also consider the…

High Energy Physics - Phenomenology · Physics 2010-10-12 V. A. Schegelsky , M. G. Ryskin , A. D. Martin , V. A. Khoze

We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (rho parameter) for present and future pp and pbar p colliders, and on total cross sections for gamma p ->…

High Energy Physics - Phenomenology · Physics 2007-05-23 J. R. Cudell , V. V. Ezhela , P. Gauron , K. Kang , Yu. V. Kuyanov , S. B. Lugovsky , E. Martynov , B. Nicolescu , E. A. Razuvaev , N. P. Tkachenko

In this brief note, we determine the fluctuations of the initial eccentricity in heavy-ion collisions caused by fluctuations of the nucleon configurations. This is done via a Monte-Carlo implementation of a Color Glass Condensate…

Nuclear Theory · Physics 2008-11-26 H. -J. Drescher , Y. Nara

We present parameter sets corresponding to new underlying event tunes for the Herwig7.3 Monte Carlo event generator. The existing Herwig tunes are in good agreement with LHC data, however, they are not typically designed for center-of-mass…

High Energy Physics - Phenomenology · Physics 2025-12-30 Umar Sohail Qureshi , Raghav Kunnawalkam Elayavalli , Luke Mozarsky , Helen Caines , Isaac Mooney

To bracket the importance of the pre-equilibrium stage on relativistic heavy-ion collision observables, we compare simulations where it is modeled by either free-streaming partons or fluid dynamics. These cases implement the assumptions of…

Nuclear Theory · Physics 2016-11-23 Ulrich W. Heinz , Jia Liu

Baryon fluctuations exceeding Poisson expectations can signal a nearly first order phase transition at RHIC. We show how these fluctuations can be measured, and apply a dissipative-hydrodynamic formulation used in condensed matter physics…

Nuclear Theory · Physics 2009-11-07 David Bower , Sean Gavin

We compute the particle multiplicities and transverse energies at central and nearly central AA collisions at RHIC and LHC. The initial state is computed from perturbative QCD supplemented by the conjecture of saturation of produced…

High Energy Physics - Phenomenology · Physics 2014-11-17 K. J. Eskola , P. V. Ruuskanen , S. S. Rasanen , K. Tuominen

The flow of frictionless granular particles is studied with stress-controlled discrete element modeling simulations for systems varying in size from 300 to 100,000 particles. The volume fraction and shear stress ratio $\mu$ are relatively…

Soft Condensed Matter · Physics 2022-01-12 A. P. Santos , Ishan Srivastava , Leonardo E. Silbert , Jeremy B. Lechman , Gary S. Grest

A dynamical appearance of scaling solutions in the relativistic hydrodynamics applied to describe ultra-relativistic heavy-ion collisions is studied. We consider the boost-invariant cylindrically symmetric systems and the effects of the…

Nuclear Theory · Physics 2009-11-10 Mikolaj Chojnacki , Wojciech Florkowski , Tamas Csorgo

Model independent techniques for constructing background data templates using generative models have shown great promise for use in searches for new physics processes at the LHC. We introduce a major improvement to the CURTAINs method by…

High Energy Physics - Phenomenology · Physics 2023-05-09 Debajyoti Sengupta , Samuel Klein , John Andrew Raine , Tobias Golling

This paper describes the conclusions that can be drawn from the data taken thus far with the PHOBOS detector at RHIC. In the most central Au+Au collisions at the highest beam energy, evidence is found for the formation of a very high energy…

Nuclear Experiment · Physics 2008-11-26 B. B. Back et al

Transverse momentum distributions measured by the STAR and PHENIX collaborations at the Relativistic Heavy Ion Collider and by the ALICE, ATLAS and CMS collaborations at the Large Hadron Collider can be considered in the framework of…

High Energy Physics - Phenomenology · Physics 2015-06-04 J. Cleymans , D. Worku