Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo

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Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo

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Author :
language : en
Publisher:
Release Date : 2016

Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

In this study, prompt photon production in √sNN = 2.76-TeV Pb+Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb-1. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals,

Centrality Dependence Of Low Momentum Direct Photon Production In Math Mrow Mi Au Mi Mo Mo Mi Au Mi Mrow Math Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant

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language : en
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Release Date : 2015

Centrality Dependence Of Low Momentum Direct Photon Production In Math Mrow Mi Au Mi Mo Mo Mi Au Mi Mrow Math Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at √sNN = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e+e− pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT . We find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range from 0.6-2.0 GeV/c. In this study, while the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N [alpha] part, where [alpha] = 1.38±0.03(stat)±0.07(syst).

Centrality Dependence Of Identified Particle Elliptic Flow In Relativistic Heavy Ion Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo

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language : en
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Release Date : 2016

Centrality Dependence Of Identified Particle Elliptic Flow In Relativistic Heavy Ion Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

Here, elliptic flow (v2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at √sNN = 7.7-62.4 GeV are presented for three centrality classes. The centrality dependence and the data at √sNN = 14.5 GeV are new. Except at the lowest beam energies, we observe a similar relative v2 baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v2 for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with a multiphase transport (AMPT) model and fit with a blast wave model.

Measurement Of Long Range Pseudorapidity Correlations And Azimuthal Harmonics In Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo

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language : en
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Release Date : 2014

Measurement Of Long Range Pseudorapidity Correlations And Azimuthal Harmonics In Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

We present measurements of two-particle correlation functions and the first five azimuthal harmonics, v1 to v5, using 28 nb−1 of p+Pb collisions at a nucleon-nucleon center-of-mass energy of √sNN =5.02 TeV measured with the ATLAS detector at the LHC. Significant long-range "ridgelike" correlations are observed for pairs with small relative azimuthal angle (

Photon And Neutral Pi 0 Production In 197 Au 197 Au Collisions At Sqrt S Nn

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language : en
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Release Date : 2003

Photon And Neutral Pi 0 Production In 197 Au 197 Au Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

Inclusive transverse momentum spectra of photons and[pi][sup 0]s at mid-rapidity are studied as a function of collision centrality for[sup 197]Au+[sup 197]Au collisions at[radical]s[sub NN]= 130 GeV. Photon pair conversions have been reconstructed from charged tracks measured by the main Time Project Chamber of the STAR experiment at the RHIC heavy ion facility. The transverse momentum resolution of photons with this method is estimated to be[Delta]p[sub t]/p[sub t]= 2% at 0.125 GeV/c and 5% at 2.5 GeV/c. Photon spectra were measured up to a transverse momentum of 2.4 GeV/c between[+-] 0.5 units of rapidity. The dominant photon production mechanism, the[pi][sup 0][yields][gamma][gamma] decay, was measured between 0.25-2.5 GeV/c and[+-] 1 units of rapidity. Spectra are reported for the top 11%, 11-34% and 34-85% centrality classes. It was observed that in mid-central and central collisions the relative contribution of the[pi][sup 0][yields][gamma][gamma] decay to the inclusive photon spectrum decreases above a transverse momentum of 1.65 GeV/c. In central collisions the magnitude of the decrease from p[sub t]= 1.65 GeV/c to 2.4 GeV/c is 20%. It is unlikely that contributions from other[pi][sup 0] decay channels and other particle decays fully explain this decrease. The centrality dependence on the shapes of the[pi][sup 0] spectra was analyzed with Boltmann and Bose-Einstein functions. In the transverse momentum windows of the spectra, the extracted temperatures are near 0.295 GeV. These temperatures are substantially higher than those extracted from[pi][sup[+-]] spectra in a lower range of transverse momentum. This is an indication that the shapes of the pion spectra deviate from purely exponential shapes.

Onset Of Radial Flow In Math Mrow Mi P Mi Mo Mo Mi P Mi Mrow Math Collisions

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language : en
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Release Date : 2015

Onset Of Radial Flow In Math Mrow Mi P Mi Mo Mo Mi P Mi Mrow Math Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

It has been debated for decades whether hadrons emerging from p+p collisions exhibit collective expansion. The signal of the collective motion in p+p collisions is not as clear as in heavy-ion collisions because of the low multiplicity and large fluctuation in p+p collisions. Tsallis Blast-Wave (TBW) model is a thermodynamic approach, introduced to handle the overwhelming correlation and fluctuation in the hadronic processes. We have systematically studied the identified particle spectra in p+p collisions from RHIC to LHC using TBW and found no appreciable radial flow in p+p collisions below √s = 900 GeV. At LHC higher energy of 7 TeV in p+p collisions, the radial flow velocity achieves an average of ([beta]) = 0.320 ± 0.005. This flow velocity is comparable to that in peripheral (40-60%) Au+Au collisions at RHIC. In addition, breaking of the identified particle spectra mT scaling was also observed at LHC from a model independent test.

Measurement Of The Inclusive Isolated Prompt Photon Cross Section In Pp Collisions At Sqrt S

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language : en
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Release Date : 2016

Measurement Of The Inclusive Isolated Prompt Photon Cross Section In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

A measurement of the cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a centre-of-mass energy of √s = 8 TeV is presented. The measurement covers the pseudorapidity ranges.

Measurement Of The Inclusive Isolated Prompt Photon Cross Section In Pp Collisions At Arrow

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language : en
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Release Date : 2011

Measurement Of The Inclusive Isolated Prompt Photon Cross Section In Pp Collisions At Arrow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

A measurement of the cross section for the inclusive production of isolated prompt photons in pp collisions at a centre-of-mass energy √s = 7TeV is presented. The measurement covers the pseudorapidity ranges.

Measurement Of The Inclusive Isolated Prompt Photon Cross Section In Pp Collisions At U221a S

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Author :
language : en
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Release Date : 2011

Measurement Of The Inclusive Isolated Prompt Photon Cross Section In Pp Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

A measurement of the cross section for the inclusive production of isolated prompt photons in pp collisions at a centre-of-mass energy √s = 7TeV is presented. The measurement covers the pseudorapidity ranges.