Measurement of Charm and Beauty Production at Central Rapidity Versus Charged-particle Multiplicity in Proton-proton Collisions at $ \sqrt{s}
Measurement of Charm and Beauty Production at Central Rapidity Versus Charged-particle Multiplicity in Proton-proton Collisions at $ \sqrt{s}

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Published: 2015

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Prompt D meson and non-prompt J/[psi] yields are studied as a function of the multiplicity of charged particles produced in inelastic proton-proton collisions at a centre-of-mass energy of $ \sqrt{s}=7 $ TeV. The results are reported as a ratio between yields in a given multiplicity interval normalised to the multiplicity-integrated ones (relative yields). They are shown as a function of the multiplicity of charged particles normalised to the average value for inelastic collisions (relative charged-particle multiplicity). D0, D+ and D*+ mesons are measured in five pT intervals from 1 GeV/c to 20 GeV/c and for.

Measurement of Neutral Strange Particle Production in the Underlying Event in Proton-proton Collisions at Sqrt(s)
Measurement of Neutral Strange Particle Production in the Underlying Event in Proton-proton Collisions at Sqrt(s)

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Published: 2013

Total Pages: 35

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Measurements are presented of the production of primary K(S)0 and Lambda particles in proton-proton collisions at sqrt(s) = 7 TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K(S)0 and Lambda particles measured at pseudorapidities abs(eta)

Charged-particle Distributions at Low Transverse Momentum in $\sqrt{s}
Charged-particle Distributions at Low Transverse Momentum in $\sqrt{s}

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Published: 2016

Total Pages: 22

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Here, 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.

Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$
Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$

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Published: 2006

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We present strange particle spectra and yields measured atmid-rapidity in sqrt text s=200 GeV proton-proton (p+p) collisions atRHIC. We find that the previously observed universal transverse mass(mathrm mT \equiv\sqrt mathrm p_T 2+\mathrm m2) scaling of hadronproduction in p+p collisions seems to break down at higher \mt and thatthere is a difference in the shape of the \mt spectrum between baryonsand mesons. We observe mid-rapidity anti-baryon to baryon ratios nearunity for Lambda and Xi baryons and no dependence of the ratio ontransverse momentum, indicating that our data do not yet reach thequark-jet dominated region. We show the dependence of the mean transversemomentum (\mpt) on measured charged particle multiplicity and on particlemass and infer that these trends are consistent with gluon-jet dominatedparticle production. The data are compared to previous measurements fromCERN-SPS, ISR and FNAL experiments and to Leading Order (LO) and Next toLeading order (NLO) string fragmentation model predictions. We infer fromthese comparisons that the spectral shapes and particle yields from $p+p$collisions at RHIC energies have large contributions from gluon jetsrather than quark jets.

A Measurement of the Underlying Event Distributions in Proton-Proton Collisions at Sqrt(s)
A Measurement of the Underlying Event Distributions in Proton-Proton Collisions at Sqrt(s)

Author: Joseph Salvatore Virzi

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Published: 2012

Total Pages: 184

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Underlying Event distributions are studied in events containing at least one charged particle jet produced in proton-proton collisions at sqrt(s) = 7 TeV. Jets are reconstructed from charged particles using the anti-Kt algorithm with radius parameter R = 0.6. The jet with the largest transverse momentum (pT) and.

Measurement of Charged Particle Multiplicity Distribution in Au + Au Collisions Up to 200 GeV
Measurement of Charged Particle Multiplicity Distribution in Au + Au Collisions Up to 200 GeV

Author: Pradeep Sarin

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Published: 2003

Total Pages: 177

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(Cont.) In the mid-rapidity region, the yield of charged particles evolves smoothly as a function of [the square root of] sNN and collision centrality. We compare our results with a compilation of data from lower energy p + p, p + A and A + A collisions and discuss their implications for various phenomenological models of particle production.