Charged-particle Multiplicity Distributions Over Wide Pseudorapidity Range in Proton-proton and Proton-lead Collisions with ALICE
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Publisher:
Published: 2015
Total Pages: 169
ISBN-13:
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The Charged Particle Multiplicity at Center of Mass Energies from 900 GeV to 7 TeV Measured with the ATLAS Experiment at the Large Hadron Collider
Author: Heather M.. Gray
Publisher:
Published: 2011
Total Pages: 384
ISBN-13:
DOWNLOAD EBOOKThe first measurements made by the ATLAS experiment at the LHC are presented. The charged particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and pseudorapidity are measured for events with at least one charged particle in the kinematic range [small Greek letter eta] 2.5 and pT 500 MeV. The charged particle multiplicity distributions are measured at the three centre of mass energies at which protons have been collided in the LHC: 900 GeV, 2.36 TeV and 7 TeV. The results are compared to predictions from Monte Carlo models of proton-proton collisions. All models predicted a multiplicity at least 10\% lower than was measured. They also failed to predict a sufficient increase in the multiplicity when the centre of mass energy increased from 900 GeV to 7 TeV. Updated models have already been produced using these data, which provide a significantly better description of the properties of proton-proton collisions at LHC energies.
Centrality Evolution of the Charged-particle Pseudorapidity Density Over a Broad Pseudorapidity Range in Pb-Pb Collisions at [mml
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Publisher:
Published: 2016
Total Pages: 13
ISBN-13:
DOWNLOAD EBOOKThe centrality dependence of the charged-particle pseudorapidity density measured with ALICE in Pb-Pb collisions at √sNN = 2.76 TeV over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral collisions. No strong change of the overall shape of charged-particle pseudorapidity density distributions with centrality is observed, and when normalised to the number of participating nucleons in the collisions, the evolution over pseudorapidity with centrality is likewise small. Broadening the pseudorapidity range (-3.5
Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at Sqrt(s)
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Publisher:
Published: 2010
Total Pages: 26
ISBN-13:
DOWNLOAD EBOOKCharged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit-pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dN{sub ch}/d[eta].
Measurement of the Centrality Dependence of the Charged-particle Pseudorapidity Distribution in Proton{u2013}lead Collisions at $\sqrt{s_{_\text {NN}}}
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Publisher:
Published: 2016
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThe centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 ?b-1 of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of $sqrt{s_{_ ext {NN}}} = 5.02$ TeV using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The ? + ?b collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the ? + ?b collision have been carried out using the Glauber model as well as two Glauber–Gribov inspired extensions to the Glauber model. In conclusion, charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon–nucleon collisions in the modelling of the initial state of ? + ?b collisions.
Multiple Parton Interactions At The Lhc
Author: Paolo Bartalini
Publisher: World Scientific Publishing
Published: 2018-11-02
Total Pages: 471
ISBN-13: 981322777X
DOWNLOAD EBOOKMany high-energy collider experiments (including the current Large Hadron Collider at CERN) involve the collision of hadrons. Hadrons are composite particles consisting of partons (quarks and gluons), and this means that in any hadron-hadron collision there will typically be multiple collisions of the constituents — i.e. multiple parton interactions (MPI). Understanding the nature of the MPI is important in terms of searching for new physics in the products of the scatters, and also in its own right to gain a greater understanding of hadron structure. This book aims at providing a pedagogical introduction and a comprehensive review of different research lines linked by an involvement of MPI phenomena. It is written by pioneers as well as young leading scientists, and reviews both experimental findings and theoretical developments, discussing also the remaining open issues.
Momentum Distributions
Author: Richard N. Silver
Publisher: Springer Science & Business Media
Published: 2013-11-11
Total Pages: 400
ISBN-13: 1489925546
DOWNLOAD EBOOKThis volume presents the proceedings of the Workshop on Momentum Distributions held on October 24 to 26, 1988 at Argonne National Laboratory. This workshop was motivated by the enormous progress within the past few years in both experimental and theoretical studies of momentum distributions, by the growing recognition of the importance of momentum distributions to the characterization of quantum many-body systems, and especially by the realization that momentum distribution studies have much in common across the entire range of modern physics. Accordingly, the workshop was unique in that it brought together researchers in nuclear physics, electronic systems, quantum fluids and solids, and particle physics to address the common elements of momentum distribution studies. The topics dis cussed in the workshop spanned more than ten orders of magnitude range in charac teristic energy scales. The workshop included an extraordinary variety of interactions from Coulombic to hard core repulsive, from non-relativistic to extreme relativistic.
Quark-gluon Plasma 4
Author: Rudolph C. Hwa
Publisher: World Scientific
Published: 2010
Total Pages: 450
ISBN-13: 9814293288
DOWNLOAD EBOOKThis is a review volume containing articles written by experts on current theoretical topics in the subject of Quark-Gluon Plasma created in heavy-ion collisions at high energy. It is the fourth volume in the series with the same title sequenced numerically. The articles are written in a pedagogical style so that they can be helpful to a wide range of researchers from graduate students to mature physicists who have not worked previously on the subject. A reader should be able to learn from the reviews without having extensive knowledge of the background literature.
Charged-particle Distributions at Low Transverse Momentum in $\sqrt{s}
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Publisher:
Published: 2016
Total Pages: 22
ISBN-13:
DOWNLOAD EBOOKHere, measurements of distributions of charged particles produced in proton-proton collisions with a centre-of-mass energy of 13 TeV are presented. The data were recorded by the ATLAS detector at the LHC and correspond to an integrated luminosity of 151 [mu]b-1. The particles are required to have a transverse momentum greater than 100 MeV and an absolute pseudorapidity less than 2.5. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the dependence of the mean transverse momentum on multiplicity are measured in events containing at least two charged particles satisfying the above kinematic criteria. The results are corrected for detector effects and compared to the predictions from several Monte Carlo event generators.
Charged Particle Multiplicity Studies in Proton-proton Collisions at a Centre-of-mass Energy of 10 TeV with the ALICE Detector
Author: Juan Francisco Castillo Hernández
Publisher:
Published: 2012
Total Pages: 103
ISBN-13:
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