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We explore parton collisional effects on the conversion of geometry eccentricities into azimuthal anisotropies in Pb+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV using a multi-phase transport model. The initial eccentricity $\varepsilon_{n}$…

Nuclear Theory · Physics 2021-02-04 Long Ma , Guo-Liang Ma , Yu-Gang Ma

The acceleration of high-intensity lead (Pb) beams for injection into the Large Hadron Collider (LHC) is limited by significant losses in the preceding CERN ion injector chain. A potential but largely uncharted source of losses are…

Accelerator Physics · Physics 2025-06-04 E. Waagaard , F. Ukena , J. Olsen , R. Alemany Fernández , J. Somoza , G. Weber

The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapidity-dependent difference ($\Delta v_2$) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, $v_2$) between…

High Energy Physics - Experiment · Physics 2021-04-05 CMS Collaboration

The behaviour of a strongly-magnetized collisional electron-positron plasma which is optically thin to cyclotron radiation is considered, and the distribution functions accessible to it on the various timescales in the system are…

Plasma Physics · Physics 2021-02-17 Daniel Kennedy , Per Helander

The light nuclei yields and yield ratios, as sensitive probes of the QCD phase transition, have been precisely measured at various collision energies.However, due to limited detector acceptance, the full $p_{\rm T}$ integral yield often…

High Energy Physics - Phenomenology · Physics 2025-11-24 Li'Ang Zhang , Hongcan Li , Junyi Han , Yaping Wang , Junlin Wu , Guannan Xie , Gao-Chan Yong

Azimuthal angle correlations of charged hadrons were measured in $\sqrt s_{NN}$ = 2.76 TeV PbPb collisions by the CMS experiment. The distributions exhibit anisotropies that are correlated with the event-by-event orientation of the reaction…

Nuclear Experiment · Physics 2019-08-13 Eric Appelt

There is event by event geometric as well as quantum fluctuations in the initial condition of heavy-ion collisions. The standard technique of analysing heavy-ion collisions in bins of centrality obtained from final state multiplicity…

Nuclear Theory · Physics 2016-01-25 Vipul Bairathi , Sandeep Chatterjee , Md. Rihan Haque , Bedangadas Mohanty

Two-particle azimuthal correlations of high-pT hadrons can serve as a probe of interactions of partons with the dense medium produced in high-energy heavy-ion collisions. First NA49 results on such correlations are presented for central and…

Nuclear Experiment · Physics 2019-08-14 Marek Szuba

Anisotropic flow of protons and negative pions in 4.2A GeV/c C+Ta collisions is studied using the Fourier analysis of azimuthal distributions. The protons exhibit pronounced directed flow. Directed flow of pions is positive in the entire…

Nuclear Experiment · Physics 2009-11-07 Lj. Simic , J. Milosevic

The consequences of a recently introduced irreducible pionic effect in low energy nucleon-deuteron scattering are analyzed. Differential cross-sections, nucleon (vector) and deuteron (vector and tensor) analyzing powers, and four different…

Nuclear Theory · Physics 2007-05-23 L. Canton , W. Schadow , J. Haidenbauer

We point out a novel mechanism to generate $\cos \phi$ two-particle azimuthal correlation (`directed flow') in unpolarized proton-proton and proton-nucleus collisions in the forward rapidity region of the projectile proton. This is a direct…

High Energy Physics - Phenomenology · Physics 2025-07-16 Sanjin Benić , Yoshitaka Hatta

Electromagnetic aspects of a QCD matter have been a hot topic in recent years. High-energy heavy-ion experiments revealed that flow harmonics of direct photons are not explained by most hydrodynamic models. In this work I discuss possible…

Nuclear Theory · Physics 2014-08-08 Akihiko Monnai

Anisotropic flow measurements constrain the shear $(\eta/s)$ and bulk ($\zeta/s$) viscosity of the quark-gluon plasma created in heavy-ion collisions, as well as give insight into the initial state of such collisions and hadronization…

Nuclear Experiment · Physics 2018-03-14 R. A. Bertens

The theoretical nuclear physics predictions and experimental results on antiprotonic atoms lead to different proton and neutron spatial distributions. At CERN SPS energies production of positive and negative pions differs for $pp$, $pn$,…

Nuclear Theory · Physics 2009-11-10 Piotr Pawłowski , Antoni Szczurek

Within a multi-phase transport (AMPT) model with the string melting mechanism and imported initial electric quadrupole moment, the difference between the elliptic flow of positive and negative pions is calculated. The slope parameter $r$ of…

Nuclear Theory · Physics 2014-07-09 Guo-Liang Ma

The PHENIX experiment discovered a large excess of low-$p_{T}$ direct photons in Au+Au collisions at 200 GeV compared to reference p+p collisions, which has been attributed to thermal radiation from the medium produced in the collisions. At…

Nuclear Experiment · Physics 2017-08-29 Wenqing Fan

We present the spatial distributions of electromagnetic fields ($\bf E$ and $\bf B$) and electromagnetic anomaly $ \bf E \cdot B$ in Au+Au collisions at the RHIC energy $\sqrt{s}$=200 GeV based on a multi-phase transport model. A dipolar…

High Energy Physics - Phenomenology · Physics 2019-04-17 Xin-Li Zhao , Guo-Liang Ma , Yu-Gang Ma

Higher order Fourier coefficients of the azimuthally dependent single particle spectra resulting from noncentral heavy ion collisions are investigated. For intermediate to large transverse momenta, these anisotropies are expected to become…

Nuclear Theory · Physics 2009-11-10 Peter F. Kolb

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 the time-dependent…

High Energy Physics - Phenomenology · Physics 2025-04-01 N. K. Dulaev , D. A. Telnov , R. V. Popov , V. M. Shabaev , Y. S. Kozhedub , X. Ma , I. A. Maltsev , A. D. Mironov , I. I. Tupitsyn

Data from the AGS experiment E866 on charged particles emitted in central Au+Au collisions at 10.8 AGeV incident energy is reviewed. The study of spectral shapes indicates the presence of collective transverse flow and - in particular for…

Nuclear Experiment · Physics 2019-08-14 C. Muentz
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