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Dielectron production in proton-proton and proton-lead collisions at $\sqrt{s_{NN}}=$ 5.02 TeV

The collaboration
Phys.Rev.C 102 (2020) 055204, 2020.

Abstract
The first measurements of dielectron production at midrapidity ($|\eta_{c}|<0.8$) in proton-proton and proton-lead collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV at the LHC are presented. The dielectron cross section is measured with the ALICE detector as a function of the invariant mass $m_{\rm{T,ee}}$ and the pair transverse momentum $p_{\rm{T,ee}}$ in the ranges $m_{\rm{T,ee}}$ < 3.5 GeV/$c^{2}$ and $m_{\rm{T,ee}}$ < 8.0 GeV/$c^{2}$, in both collision systems. In proton-proton collisions, the charm and beauty cross sections are determined at midrapidity from a fit to the data with two different event generators. This complements the existing dielectron measurements performed at $\sqrt{s}$ = 7 and 13 TeV. The slope of the $\sqrt{s}$ dependence of the three measurements is described by FONLL calculations. The dielectron cross section measured in proton-lead collisions is in agreement, within the current precision, with the expected dielectron production without any nuclear matter effects for $\rm{e}^{+}\rm{e}^{-}$ pairs from open heavy-flavor hadron decays. For the first time at LHC energies, the dielectron production in proton-lead and proton-proton collisions are directly compared at the same $\sqrt{s_{\rm{NN}}}$ via the dielectron nuclear modification factor $R_{\rm{pPb}}$. The measurements are compared to model calculations including cold nuclear matter effects, or additional sources of dielectrons from thermal radiation.

• #### Table 1

Figure 5 left

10.17182/hepdata.98625.v1/t1

Inclusive $e^+e^-$ cross section in pp collisions at $\sqrt{s}$ = 5.02 TeV as a function of $m_{\rm ee}$. Electrons are...

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Figure 5 right

10.17182/hepdata.98625.v1/t2

Inclusive $e^+e^-$ cross section in p-Pb collisions at $\sqrt{s}$ = 5.02 TeV as a function of $m_{\rm ee}$. Electrons are...

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Figure 6 left

10.17182/hepdata.98625.v1/t3

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Figure 7 left

10.17182/hepdata.98625.v1/t5

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Figure 8

10.17182/hepdata.98625.v1/t7

Dielectron nuclear modification factor $R_{\rm pPb}$ at $\sqrt{s}$ = 5.02 TeV as a function of $m_{\rm ee}$. Electrons are measured...

• #### Table 8

Figure 9 left

10.17182/hepdata.98625.v1/t8