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Measurement of electrons from heavy-flavour hadron decays in p-Pb collisions at
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The production of electrons from heavy-flavour hadron decays was measured as a function of transverse momentum (le="Click to view the MathML source">pT) in minimum-bias p–Pb collisions at le="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si1.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=b1cc8bc8ab2427eca86dd7d4f446f259">View the MathML sourcele="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315010151-si1.gif"> using the ALICE detector at the LHC. The measurement covers the le="Click to view the MathML source">pT interval le="Click to view the MathML source">0.5<pT<12 GeV/c and the rapidity range le="Click to view the MathML source">−1.065<ycms<0.135 in the centre-of-mass reference frame. The contribution of electrons from background sources was subtracted using an invariant mass approach. The nuclear modification factor le="Click to view the MathML source">RpPb was calculated by comparing the le="Click to view the MathML source">pT-differential invariant cross section in p–Pb collisions to a pp reference at the same centre-of-mass energy, which was obtained by interpolating measurements at le="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si116.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=6f276a89225c9273288785adedf62c11">View the MathML sourcele="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315010151-si116.gif"> and le="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si126.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=9c935ad32becaa97c21d560af0879b6e">View the MathML sourcele="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315010151-si126.gif">. The le="Click to view the MathML source">RpPb is consistent with unity within uncertainties of about 25%, which become larger for le="Click to view the MathML source">pT below le="Click to view the MathML source">1 GeV/c. The measurement shows that heavy-flavour production is consistent with binary scaling, so that a suppression in the high-le="Click to view the MathML source">pT yield in Pb–Pb collisions has to be attributed to effects induced by the hot medium produced in the final state. The data in p–Pb collisions are described by recent model calculations that include cold nuclear matter effects.

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