Multiplicity And Transverse Momentum Evolution Of Charge Dependent Correlations In Pp P Pb And Pb Pb Collisions At The Lhc
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Multiplicity And Transverse Momentum Evolution Of Charge Dependent Correlations In Pp P Pb And Pb Pb Collisions At The Lhc
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Author :
language : en
Publisher:
Release Date : 2016
Multiplicity And Transverse Momentum Evolution Of Charge Dependent Correlations In Pp P Pb And Pb Pb Collisions At The Lhc 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, we report on two-particle charge-dependent correlations in pp, p-Pb, and Pb-Pb collisions as a function of the pseudorapidity and azimuthal angle difference, [Delta][eta] and [Delta][phi] respectively. These correlations are studied using the balance function that probes the charge creation time and the development of collectivity in the produced system. The dependence of the balance function on the event multiplicity as well as on the trigger and associated particle transverse momentum (pT) in pp, p-Pb, and Pb-Pb collisions at √sNN = 7, 5.02, and 2.76 TeV, respectively, are presented. In the low transverse momentum region, for 0.2
Multiplicity And Transverse Momentum Evolution Of Charge Dependent Correlations In Pp P U2013 Pb And Pb U2013 Pb Collisions At The Lhc
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Author :
language : en
Publisher:
Release Date : 2016
Multiplicity And Transverse Momentum Evolution Of Charge Dependent Correlations In Pp P U2013 Pb And Pb U2013 Pb Collisions At The Lhc 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, we report on two-particle charge-dependent correlations in pp, p–Pb, and Pb–Pb collisions as a function of the pseudorapidity and azimuthal angle difference, ?? and ?? respectively. These correlations are studied using the balance function that probes the charge creation time and the development of collectivity in the produced system. The dependence of the balance function on the event multiplicity as well as on the trigger and associated particle transverse momentum (pT) in pp, p–Pb, and Pb–Pb collisions at √sNN = 7, 5.02, and 2.76 TeV, respectively, are presented. In the low transverse momentum region, for 0.2 psubT/sub 2.0 GeV/c, the balance function becomes narrower in both ?? and ?? directions in all three systems for events with higher multiplicity. The experimental findings favor models that either incorporate some collective behavior (e.g. AMPT) or different mechanisms that lead to effects that resemble collective behavior (e.g. PYTHIA8 with color reconnection). For higher values of transverse momenta the balance function becomes even narrower but exhibits no multiplicity dependence, indicating that the observed narrowing with increasing multiplicity at low p
High Energy Physics 99 Proceedings Of The International Europhysics Conference On High Energy Physics Tampere Finland 15 21 July 1999
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Author : K Huitu
language : en
Publisher: CRC Press
Release Date : 2000-01-01
High Energy Physics 99 Proceedings Of The International Europhysics Conference On High Energy Physics Tampere Finland 15 21 July 1999 written by K Huitu and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-01-01 with Science categories.
High Energy Physics 99 contains the 18 invited plenary presentations and 250 contributions to parallel sessions presented at the International Europhysics Conference on High Energy Physics. The book provides a comprehensive survey of the latest developments in high energy physics. Topics discussed include hard high energy, structure functions, soft interactions, heavy flavor, the standard model, hadron spectroscopy, neutrino masses, particle astrophysics, field theory, and detector development.
Annual Report European Organization For Nuclear Research
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Author : European Organization for Nuclear Research
language : en
Publisher:
Release Date : 1992
Annual Report European Organization For Nuclear Research written by European Organization for Nuclear Research and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1993
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Physics categories.
Transverse Momentum Evolution Of Hardon V0 Correlations In Pp Collisions At Square Root S
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Author : Sandun Yasassri Jayarathna Pahula Hewage
language : en
Publisher:
Release Date : 2015
Transverse Momentum Evolution Of Hardon V0 Correlations In Pp Collisions At Square Root S written by Sandun Yasassri Jayarathna Pahula Hewage and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Heavy ions categories.
The Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) in Geneva, Switzerland, is capable of accelerating beams of protons (pp) and heavy-ions (Pb+Pb) up to nearly the speed of light, which corresponds to center of mass energies of 7 TeV and 2.76 TeV, respectively. The goal of the pp program is to investigate physics of and beyond the standard model, while the heavy-ion program attempts to characterize the properties of a new state of matter, called the Quark Gluon Plasma. The main aim of this dissertation is to identify particle production mechanisms in pp collisions, also as a reference for possible modifications due to the plasma formation in heavy-ion collisions. Two-particle azimuthal correlation measurements were employed, which allow the study of high-pT parton fragmentation without full jet reconstruction. We present the results of correlations between charged trigger particles and associated strange baryons and mesons. Enhancements of the azimuthal correlations are seen at dphi= 0 and dphi= pi, resulting from back-to-back jet fragmentation in the parton center-of-mass system. Two model fit functions were introduced to characterize the properties of the jet peaks. Hard and soft yields were seperated using the ZYAM method and extracted yields were compared with pQCD inspired models and inclusive spectra. The analysis was performed in different multiplicity bins to detect possible enhancements of baryons or meson yields and the baryon/meson ratio. The latter was observed in high multiplicity Pb+Pb collisions and interpreted as a novel production mechanism in the deconfined medium produced at the LHC. A novel data-driven feeddown correction for Lambda is also introduced, which could allow a more accurate calculation of the primary Xi.
Evidence For Collectivity In Pp Collisions At The Lhc
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Author :
language : en
Publisher:
Release Date : 2016
Evidence For Collectivity In Pp Collisions At The Lhc 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.
Measurements of two- and multi-particle angular correlations in pp collisions at sqrt(s) = 5, 7, and 13 TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0 inverse picobarns (5 TeV), 6.2 inverse picobarns (7 TeV), and 0.7 inverse picobarns (13 TeV), were collected using the CMS detector at the LHC. The second-order (v[2]) and third-order (v[3]) azimuthal anisotropy harmonics of unidentified charged particles, as well as v[2] of K0 short and Lambda/anti-Lambda particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v[2] values of charged hadrons (mostly pions), K0 short, and Lambda/anti-Lambda, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pt~2 GeV/c. For 13 TeV data, the v[2] signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.
Multiplicity And Rapidity Dependence Of Strange Hadron Production In Pp Ppb And Pbpb Collisions At The Lhc
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Author :
language : en
Publisher:
Release Date : 2016
Multiplicity And Rapidity Dependence Of Strange Hadron Production In Pp Ppb And Pbpb Collisions At The Lhc 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.
Measurements of strange hadron (K0s, Lambda + anti-Lambda, and Xi+ + Xi- ) transverse momentum spectra in pp, pPb, and PbPb collisions are presented over a wide range of rapidity and event charged-particle multiplicity. The data were collected with the CMS detector at the CERN LHC in pp collisions at sqrt(s) = 7 TeV, pPb collisions at sqrt(s[NN]) = 5.02 TeV, and PbPb collisions at sqrt(s[NN]) = 2.76 TeV. The average transverse kinetic energy is found to increase with multiplicity, at a faster rate for heavier strange particle species in all systems. At similar multiplicities, the difference in average transverse kinetic energy between different particle species is observed to be larger for pp and pPb events than for PbPb events. In pPb collisions, the average transverse kinetic energy is found to be slightly larger in the Pb-going direction than in the p-going direction for events with large multiplicity. The spectra are compared to models motivated by hydrodynamics.
Multiplicity Dependence Of Jet Like Two Particle Correlation Structures In P Pb Collisions At Arrow Nn
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Author :
language : en
Publisher:
Release Date : 2014
Multiplicity Dependence Of Jet Like Two Particle Correlation Structures In P Pb Collisions At Arrow 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 2014 with categories.
Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum range 0.7
Long Range Two Particle Correlations Of Strange Hadrons With Charged Particles In Ppb And Pbpb Collisions At Lhc Energies
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Author :
language : en
Publisher:
Release Date : 2015
Long Range Two Particle Correlations Of Strange Hadrons With Charged Particles In Ppb And Pbpb Collisions At Lhc Energies 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 measurements of two-particle angular correlations between an identified strange hadron ( K0s or [Lambda]/[Lambda]- ) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb-1, were collected at a nucleon-nucleon center-of-mass energy (√sNN ) of 5.02 TeV with the CMS detector at the LHC. Our results are compared to semi-peripheral PbPb collision data at √sNN , covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v2) and third-order (v3) anisotropy harmonics of K0s and [Lambda]/[Lambda]- particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v2 and v3 is observed. For pT