Measurement of electrons from heavy-flavour hadron decays as a function of multiplicity in p-Pb collisions at s
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Springer
Received: November Revised: January Accepted: January Published: February
17, 17, 20, 12,
2019 2020 2020 2020
The ALICE collaboration E-mail: [email protected] Abstract: The multiplicity dependence of electron production from heavy-flavour hadron √ decays as a function of transverse momentum was measured in p-Pb collisions at sNN = 5.02 TeV using the ALICE detector at the LHC. The measurement was performed in the centre-of-mass rapidity interval −1.07 < ycms < 0.14 and transverse momentum interval 2 < pT < 16 GeV/c. The multiplicity dependence of the production of electrons from heavy-flavour hadron decays was studied by comparing the pT spectra measured for different multiplicity classes with those measured in pp collisions (QpPb ) and in peripheral p-Pb collisions (Qcp ). The QpPb results obtained are consistent with unity within uncertainties in the measured pT interval and event classes. This indicates that heavy-flavour decay electron production is consistent with binary scaling and independent of the geometry of the collision system. Additionally, the results suggest that cold nuclear matter effects are negligible within uncertainties, in the production of heavy-flavour decay electrons at midrapidity in p-Pb collisions. Keywords: Hadron-Hadron scattering (experiments) ArXiv ePrint: 1910.14399
Open Access, Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP02(2020)077
JHEP02(2020)077
Measurement of electrons from heavy-flavour hadron decays as a function of multiplicity in p-Pb collisions √ at sNN = 5.02 TeV
Contents 1
2 Experimental apparatus, data sample, and event selection 2.1 Experimental apparatus 2.2 Data sample and event selection 2.2.1 Centrality determination 2.2.2 Trigger scaling factor
4 4 5 6 6
3 Analysis
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4 Systematic uncertainties
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5 pp reference
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6 Results
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7 Summary
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The ALICE collaboration
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1
Introduction
Ultra-relativistic heavy-ion collisions provide suitable conditions to investigate the properties of strongly-interacting matter under extreme temperature and/or energy density. Under these conditions, lattice quantum chromodynamics calculations predict a transition from a hadronic to a partonic phase, known as the Quark-Gluon Plasma (QGP) [1, 2]. Heavy quarks, i.e., charm and beauty quarks, are sensitive probes of the QGP as they are predominantly produced in the early stages of the collisions via hard scattering processes characterised by time scales shorter than the production time of the QGP [3, 4]. Since the heavy quark production and annihilation rates in the thermal phase are negligible [5], they experience the entire space-time evolution of the system by interacting via elastic and radiative processes [6–8]. The nuclear modification factor (RAA ) is commonly used to study the energy loss of partons in the medium. The RAA is defined as the ratio between the transverse momentum (pT ) differential yield of the produced particles in nucleus-nucleus collisions and the pT
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