Strong Suppression Of Upsilon Excited States In Pb Pb Collisions At Square Root S Subscript Nn
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Strong Suppression Of Upsilon Excited States In Pb Pb Collisions At Square Root S Subscript Nn
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Author : Chad Steven Flores
language : en
Publisher:
Release Date : 2017
Strong Suppression Of Upsilon Excited States In Pb Pb Collisions At Square Root S Subscript Nn written by Chad Steven Flores and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The relative yields of [upsilon] mesons produced in p + p and Pb+Pb collisions at [square root] s[subscript NN] = 5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, [upsilon](2S) and [upsilon](3S), to the ground state, [upsilon](1S), in both Pb+Pb and p + p collisions at the same energy. The double ratios, [[upsilon](nS)/[upsilon](1S)][subscript PbPb] /[[upsilon](nS)/[upsilon](1S)][subscript pp] ,are measured to be 0.308 ± 0.055 (stat) ± 0.019 (syst) for the [upsilon](2S) and less than 0.26 at 95% confidence level for the [upsilon](3S). The double ratios are studied as a function of collision centrality, as well as dimuon transverse momentum, and rapidity. As a function ofcollision centrality the [upsilon](2S) double ratio is consistent with unity in the most peripheral (70–100%) bin and is consistent with zero in the most central (0–5%) bin. The [upsilon](2S) double ratio is consistent with a constant dependence on the kinematic variables, with a large suppression seen throughout the studied kinematic range. No significant [upsilon](3S) signal is found in the Pb+Pb data. The [upsilon](3S) double ratio is consistently below unity for all bins, including the most peripheral (50–100%) bin, indicating a strong suppression of the [upsilon](3S) relative to the [upsilon](1S).
Indications Of Suppression Of Excited Upsilon States In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2011
Indications Of Suppression Of Excited Upsilon States In Pbpb 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 2011 with categories.
A comparison of the relative yields of Upsilon resonances in the mu(+) mu( - ) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions, (Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.
Suppression Of Upsilon 1s Upsilon 2s And Upsilon 3s Production In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2016
Suppression Of Upsilon 1s Upsilon 2s And Upsilon 3s Production In Pbpb 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 2016 with categories.
The production yields of Upsilon(1S), Upsilon(2S), and Upsilon(3S) quarkonium states are measured through their decays into muon pairs in the CMS detector, in PbPb and pp collisions at the centre-of-mass energy per nucleon pair of 2.76 TeV. The data correspond to integrated luminosities of 166 inverse microbarns and 5.4 inverse picobarns for PbPb and pp collisions, respectively. Differential production cross sections are reported as functions of Upsilon rapidity $y$ up to 2.4, and transverse momentum pt up to 20 GeV/c. A strong centrality-dependent suppression is observed in PbPb relative to pp collisions, by factors of up to ~2 and 8, for the Upsilon(1S) and Upsilon(2S) states, respectively. No significant dependence of this suppression is observed as a function of y or pt. The Upsilon(3S) state is not observed in PbPb collisions, which corresponds to a suppression for the centrality-integrated data by at least a factor of ~7 at a 95% confidence level. The observed suppression is in agreement with theoretical scenarios modeling the sequential melting of quarkonium states in a quark gluon plasma.
Suppression And Azimuthal Anisotropy Of Prompt And Nonprompt J Psi Production In Pbpb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2016
Suppression And Azimuthal Anisotropy Of Prompt And Nonprompt J Psi Production In Pbpb 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 2016 with categories.
The nuclear modification factor ${R_{\mathrm{AA}}} $ and the azimuthal anisotropy coefficient ${v_{2}} $ of prompt and nonprompt (i.e. those from decays of b hadrons) $\mathrm{J}/\psi$ mesons, measured from PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}} = $ 2.76 TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta $p_{\mathrm{T}}> $ 6.5 GeV/$c$ and rapidity $
Upsilon Production And Suppression As Measured By Star In P P D Au And Au Au Collisions At Squareroot S Nn
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Author : Anthony Robert Kesich
language : en
Publisher:
Release Date : 2014
Upsilon Production And Suppression As Measured By Star In P P D Au And Au Au Collisions At Squareroot S Nn written by Anthony Robert Kesich 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.
Debye screening of inter-quark potentials leading to suppression of heavy quarkonia has long been a studied signature of the onset of partonic deconfinement. We report on the production of [Upsilon](1S+2S+3S) mesons at [squareroot]s(NN) = 200 GeV in p + p, d + Au, and Au + Au collisions as measured by the Solenoidal Tracker At RHIC. We compare our measured yield in p + p collisions to those in d + Au and Au + Au collisions to obtain nuclear modification factors and quantify suppression effects from both hot and cold nuclear matter. We separate our Au + Au measurements into three centrality classes. We obtain a nu- clear modification factor for [Upsilon](1S+2S+3S) in the rapidity range [vertical line]y[vertical line]
Multiparticle Correlations In Pb Pb Collisions At P Square Root Symbol Nn
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Author : Jocelyn Mlynarz
language : en
Publisher:
Release Date : 2014
Multiparticle Correlations In Pb Pb Collisions At P Square Root Symbol Nn written by Jocelyn Mlynarz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Condensed matter categories.
Quantum Chromodynamics, which describe the interactions of quarks and gluons, have been found not to violate global parity symmetry. However, the possibility of local parity violations due to transitions in the vacuum state of QCD is not excluded. The effects of these parity violations could be measured in the hot and dense medium created in the ultrarelativistic heavy ion collisions experiment conducted at the Large Hadron Collider, called a Quark-Gluon Plasma, in which the quarks that compose most of ordinary matter are deconfined. In the strong magnetic fields which permeate the QGP in non-central collisions, parity violation would express itself as a charge asymetry with respect to the reaction plane, a phenomenon called the Chiral Magnetic Effect. The measurements of the charge-dependent correlations in a heavy-ion collisions allows to experimentally probe effects of the CME. These measurements are conducted via the use of the second harmonic two-particle correlator with respect to the reaction plane, $\langle\cos(\phi_{a}+\phi_{b}-2\psi)\rangle$ The background affecting these measurements is the consequence of an interplay of strong anisotropic flow and correlations unrelated to the CME. Correlations with respect to the fourth harmonic, $\langle\cos(2\phi_{a}+2\phi_{b}-4\psi)\rangle$, are insensitive to the CME and can be used to estimate the magnitude of these background effects. In this thesis, we present results from charge-dependent correlations with respect to both the second and fourth harmonic event planes measured in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV at the LHC using data from the ALICE detector. We also present calculations of the ratio of the fourth to second harmonics based on the blast-wave model, which serve as a baseline to understand how these background effects scale between one harmonic and another.
Measurements Of Charged Particle Transverse Momentum Spectra In Pbpb Collisions At Square Root Of Nn
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Author : Eric Appelt
language : en
Publisher:
Release Date : 2014
Measurements Of Charged Particle Transverse Momentum Spectra In Pbpb Collisions At Square Root Of Nn written by Eric Appelt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Collisions (Nuclear physics) categories.
Centrality Dependence Of High Pt D Meson Suppression In Pb Pb Collisions At Sqrt S Mathrm N Mathrm N
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Author :
language : en
Publisher:
Release Date : 2015
Centrality Dependence Of High Pt D Meson Suppression In Pb Pb Collisions At Sqrt S Mathrm N Mathrm N 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.
We measured the nuclear modification factor, R-AA, of the prompt charmed mesons D°, D+ and D*+, and their antiparticles, using the ALICE detector in Pb-Pb collisions at a centre-of-mass energy √sNN = 2.76 TeV in two transverse momentum intervals, 5
Predictions For P Pb Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Predictions For P Pb 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 2014 with categories.
Suppression Of Non Prompt J Psi Prompt J Psi And Y 1s In Pbpb Collisions At Sqrt Snn
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Author :
language : en
Publisher:
Release Date : 2012
Suppression Of Non Prompt J Psi Prompt J Psi And Y 1s In Pbpb Collisions At Sqrt Snn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Yields of prompt and non-prompt J/psi, as well as Y(1S) mesons, are measured by the CMS experiment via their dimuon decays in PbPb and pp collisions at sqrt(sNN) = 2.76 TeV for quarkonium rapidity.