CERN Accelerating science

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(a): Measured \dEdx in the TPC as function of momentum $p$ expressed as a deviation from the expected energy loss of electrons, normalised by the energy-loss resolution ($\sigmaTPC$) after eID with TOF. The solid lines indicate the $\nsigmaTPC$ selection criteria for the TPC and TOF eID strategy. (b): \Ep\ distribution of electrons ($-1 < \nsigmaTPC < 3$) and hadrons ($\nsigmaTPC < -3.5$) in the transverse momentum interval \ptrange{6}{8}. The \Ep\ distribution of hadrons was normalised to that of electrons in the lower \Ep\ range (0.4--0.6), where hadrons dominate. The solid lines indicate the applied electron selection criteria.Caption not extracted

Invariant mass distributions of unlike-sign and like-sign electron pairs for the inclusive electron \pt interval \mbox{\ptrange{0.5}{0.6}}. The difference between the distributions yields the photonic contribution.

The \pt-differential invariant cross section of electrons from heavy-flavour hadron decays in minimum-bias \pPb collisions at \mbox{\sqpA}, comparing the results of the eID strategies in the two transition regions at 2.5 and 6 \GeVc. The centre values are slightly shifted along the \pt-axis in the transition regions for better visibility. The results agree within 1\%. Details on the eID strategies can be found in the text.

\pt-differential invariant cross section of electrons from heavy-flavour hadron decays in minimum-bias \pPb collisions at \mbox{\sqpA}. The pp reference obtained via the interpolation method is shown, not scaled by $A$, for comparison. The statistical uncertainties are indicated for both spectra by error bars, the systematic uncertainties are shown as boxes.

The \pt-differential invariant cross section of electrons from heavy-flavour hadron decays in minimum-bias \pPb collisions at \mbox{\sqpA}. The pp reference obtained via the interpolation method is shown, not scaled by $A$, for comparison. The statistical uncertainties are indicated for both spectra by error bars, the systematic uncertainties are shown as boxes.

Nuclear modification factor \RpPb of electrons from heavy-flavour hadron decays as a function of transverse momentum for minimum-bias \pPb collisions at \mbox{\sqpA}, compared with theoretical models~\cite{Cacciari:1998it,Eskola:2009uj,Sharma:2009hn,Kang:2014hha,Sickles:2013yna}, as described in the text. The vertical bars represent the statistical uncertainties, and the boxes indicate the systematic uncertainties. The systematic uncertainty from the normalisation, common to all points, is shown as a filled box at high \pt.