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Measurement of jet fragmentation in 5.02 TeV proton-lead and proton-proton collisions with the ATLAS detector

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arxiv 1706.02859 v2 pith:3FXWM42M submitted 2017-06-09 hep-ex

classification hep-ex
keywords fragmentationcollisionsfunctionsmeasurementmomentumatlasdatadetector
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A measurement of the fragmentation functions of jets into charged particles in $p$+Pb collisions and $pp$ collisions is presented. The analysis utilizes 28 nb$^{-1}$ of $p$+Pb data and 26 pb$^{-1}$ of $pp$ data, both at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV, collected in 2013 and 2015, respectively, with the ATLAS detector at the LHC. The measurement is reported in the centre-of-mass frame of the nucleon-nucleon system for jets in the rapidity range $|y^{*}|<$1.6 and with transverse momentum 45 $ < p_{\mathrm{T}} <$ 260 GeV. Results are presented both as a function of the charged-particle transverse momentum and as a function of the longitudinal momentum fraction of the particle with respect to the jet. The $pp$ fragmentation functions are compared with results from Monte Carlo event generators and two theoretical models. The ratios of the $p$+Pb to $pp$ fragmentation functions are found to be consistent with unity.

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  1. Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and $pp$ collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV with the ATLAS detector

    nucl-ex 2019-08 accept novelty 6.0 of 10

    In central Pb+Pb collisions, charged particles below 4 GeV are enhanced around jets at large angular distances, while particles above 4 GeV are suppressed outside the jet core, relative to pp collisions.

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