Prompt Contributions To The Dilepton Yield In Heavy Ion Collisions

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Photon and dilepton emission in a quark-gluon plasma

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PACS 25.75.-q Relativistic heavy-ion collisions. PACS 25.75.Dw Particle and resonance production. PACS 25.75.Cj Photon, lepton, and heavy quark production in relativistic heavy ion collisions. 1. Introduction The investigation of nuclear matter under extreme conditions is one of the major research topics of nuclear and high

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S P PACS numbers: 12.38.Mh, 13.20.Gd, 25.75.Nq, 11.80.Cr

dilepton event samples, as an instrument to study the suppression of ˜ c and ˜ b in heavy-ion collisions, where a direct determination of signal yields involving the identi cation of low-energy photons is essentially impossible. A change of the observed J/ and (1 S) polarizations from proton-proton to central nucleus-nucleus collisions would

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probes. In §5 suppression of heavy quarks in QGP measured through the p T spectra of heavy flavoured mesons are mentioned briefly. Sections 6 deals with the summary and discussions. 2. Photon and dilepton production in heavy-ion collisions In heavy-ion collisions (HIC), photons and dileptons are produced by various mecha-

JHEP09(2018)064 E-mail - Springer

IMR, a signi cant excess over the yield from semileptonic decays of heavy-avour hadrons is found at the SPS [34,35,51,52], whereas at RHIC the data can be fairly well described by calculations including heavy-avour contributions estimated in pp collisions and scaled with the number of binary collisions [24,36{38].

Electromagnetic probes of the QGP

of heavy -ion collisions during slight increase at high p T for yield and v 2 small effect, right direction! to account for the baryonic contributions

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PROBING THE EVOLUTION OF HEAVY-ION COLLISIONS PHYSICAL REVIEW C 102, 024915 (2020) FIG. 1. Comparison of the invariant yield of direct photons from different sources to ALICE measurements in central (0 20%) Pb-Pb collisions at √ s NN = 2.76 TeV [6]. On the left we show photon contributions from prompt (dotted line), thermal (dash-dotted

repository.lib.fit.edu

Physics LettersB 736 (2014) 33 57 Contents lists available at ScienceDirect Physics Letters B. www.elsevier.com/locate/physletb. Measurement√ of the ratio. B (t

FREE CONSTITUENT QUARKS AND DILEPTON PRODUCTION IN HEAVY

course of heavy ion collisions at high energies are by far more numerous (up to a factor about 5 ÷ 7), than what could be predicted by direct summing up the contributions of known mesonic resonance decays (CERES cocktail), although the similar treatment of dilepton yield in the proton-nucleus collisions was quite successful. Since then, many

Electromagnetic probes in nuclear collisions: low and

Dilepton production in heavy ion collisions Sources of Dilepton Emission: emission from equilibrated matter (thermal radiation) - Quark-Gluon Plasma: qq →l+l−, - Hot+Dense Hadron Gas: π+π−→l+l−, -QGP Hadron Gas ρ

Prompt contributions to the dilepton yield in heavy ion

Prompt contributions to the dilepton yield in heavy ion collisions J. H˜ufner 1;2, Yu.P. Ivanov 3, B.Z. Kopeliovich2;3, J. Raufeisen1;2 1 Institut f˜ur Theoretische Physik der Universit˜at, Philosophenweg 19, 69120 Heidelberg, Germany 2 Max-Planck Institut f˜ur Kernphysik, Postfach 103980, 69029 Heidelberg, Germany

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Heavy Ion Collisions QCD predicts a transition between nuclear matter and a deconfined state of quarks and gluons (QGP) at high temperature and density SPS low energy ~ 20 GeV/nucleon SPS high energy ~ 200 GeV/nucleon Heavy ion collisions provide the way to search for this transition in the laboratory

Prompt Contributions to the Dilepton Yield in Heavy Ion

Prompt Contributions to the Dilepton Yield in Heavy Ion Collisions J. H¨ufner a ;b,Yu.P.Ivanov c, B.Z. Kopeliovich and J. Raufeisena;b a Institut f¨ur Theoretische Physik der Universit¨at, Philosophenweg 19, D-69120 Heidelberg, Germany

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Dilepton spectra with η component subtracted Phys. Lett. B 690 (2010) 118 Excess of pair yield above h-contribution established Excess in CC scales with E beam like π production! ~ A part Excess in First chance collision is very slightly below CC Significant increase of excess in ArKCl ~ (A part )1.4

arXiv:1409.4190v1 [nucl-th] 15 Sep 2014

While the dilepton spectra at low invariant mass show in-medium effects like an enhancement from multiple baryonic resonance formation or a collisional broadening of the vector meson spectral functions, the dilepton yield at high invariant masses (above 1.1 GeV) is dominated by QGP contributions for central heavy-ion collisions at ultra-

Review Article Electromagnetic Radiations from Heavy Ion

() Prompt : the EM radiations produced by hard scatter-ing of the partons inside the nucleons of incoming nuclei in the initial stage of collision, before the thermalization sets in, are known as prompt photons and dileptons (Drell Yan). is contribution may be evaluated by using pQCD. Preequilibrium :thepreequilibrium photons and dilep-

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Jun 09, 2019 2. Global features of heavy ion collisions at LHC as compared to RHIC The multiplicity of produced particles is probably the most basic of observables. It provides information on the energy density achieved in the collisions and constitutes a primary input for most model calculations. For central Pb-Pb collisions at the LHC (at √ s2NN = 76

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Thermal Radiation from Au + Au Collisions at √ s = 200 GeV/A Energy 2 1. Introduction Study of photon spectra emanating from hot and dense matter formed in ultra-relativistic heavy ion collisions is a field ofconsiderable current interest. Electromagnetic probes have been proposed to be the promising tools to characterize the initial state of

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pp and in PbPb collisions. 1. Introduction The strongly interacting state of matter created in heavy-ion collisions can be cleanly probed via processes that decay in the dilepton channel. Given the fact that leptons do not interact via the strong force, these can traverse the medium unaffected. When studying dileptons experimentally,

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relativistic heavy-ion collisions, was soon followed by a suggestion [1] that it should be accompanied by charac-teristic production of photons. The e ectiveness of pho-tons in probing the history of such a hot and dense matter stems from the fact that, after production, they leave the system without any further interaction and thus carry

arXiv: 1709.07411, 1711.03143, 2006

The first collisions of unequal species @ LHC revealed surprises signs similar to QGP formation interest exploded (the 3rd most cited CMS paper in PLB!) Phys. Lett. B 718 (2013) 795 AA Make a QGP pp Establish the baseline pA Control initial state effect s → can only alter incoming wavefun traditional Heavy-Ion (HION) playbook

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contributions such as thermal radiation via qq annihilation. If the yield in the IMR is dominated by open charm, it is expected to in-crease proportional to the number of binary collisions. The yield per number of binary collision N coll in the mass range 1.2

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compare yield in heavy-ion and proton-proton collisions hard probes → scale by mean number of collisions for given centrality Glauber → Monte Carlo calculations RAA= d2 N AA/dpTdy 〈Ncoll〉d 2 N pp/dpTdy Ann.Rev.Nucl.Part.Sci. 57 (2007) 205-243

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the dilepton spectra from Pb+Au collisions at 158 GeV /nucleon. These same effects, namely prompt πρ →πe+e In future heavy-ion programs, considerable effort will be spent on gaining

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The dilepton experimental program has been continued at higher energies at the Relativistic Heavy-Ion Collider (RHIC) by PHENIX and STAR. The first dielectron measurement in Au Au collisions at a center-of-mass energy per nucleon 024002-2

physics program with CMS at the LHC - indico.cern.ch

Proton-proton collisions at low x Partons from each proton decelerate and meet to produce the hard scattering subsystem (ME) Low x ↔ long parton showers Forward particles can be produced in 2 ways: Collision between a low- and a high- x parton → hard interaction system goes forward Collision between two low-x

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ultrarelativistic heavy-ion collisions. This has to be a three-step process: In the first step, propertiesofhot anddensehadronicmatter areinvestigated,culminatingin theintroduction of a phenomenological quasiparticle model for the description of the quark-gluon plasma (QGP) phase.

NA60 results on thermal dimuons

Dilepton transverse momentum spectra three contributions to p T spectra note: final-state lepton pairs themselves only weakly coupled → handle on emission region, i.e. nature of emitting source T - dependence of thermal distribution of mother hadrons/partons M - dependent radial flow (vT) of mother hadrons/partons p