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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 (<span id="mmlsi2" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si2.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=fc913c73eb2d293f338bf5eac1af122e" title="Click to view the MathML source">p<sub>Tsub>span><span class="mathContainer hidden"><span class="mathCode">si2.gif" overflow="scroll">sub>pTsub>span>span>span>) in minimum-bias p&ndash;Pb collisions at <span id="mmlsi1" class="mathmlsrc">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">ss="imgLazyJSB inlineImage" height="15" width="105" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315010151-si1.gif">script>style="vertical-align:bottom" width="105" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315010151-si1.gif">script><span class="mathContainer hidden"><span class="mathCode">si1.gif" overflow="scroll">sqrt>sub>sNNsub>sqrt>=5.02 TeVspan>span>span> using the ALICE detector at the LHC. The measurement covers the <span id="mmlsi2" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si2.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=fc913c73eb2d293f338bf5eac1af122e" title="Click to view the MathML source">p<sub>Tsub>span><span class="mathContainer hidden"><span class="mathCode">si2.gif" overflow="scroll">sub>pTsub>span>span>span> interval <span id="mmlsi117" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si117.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=64f08a678f93b10e95cd074cc4808f53" title="Click to view the MathML source">0.5<p<sub>Tsub><12 GeV/cspan><span class="mathContainer hidden"><span class="mathCode">si117.gif" overflow="scroll">0.5<sub>pTsub><12 GeVstretchy="false">/cspan>span>span> and the rapidity range <span id="mmlsi129" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si129.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=75d9e03aaa27e92fff8630c644cede5b" title="Click to view the MathML source">&minus;1.065<y<sub>cmssub><0.135span><span class="mathContainer hidden"><span class="mathCode">si129.gif" overflow="scroll">&minus;1.065<sub>ycmssub><0.135span>span>span> 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 <span id="mmlsi114" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si114.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=7870a314240d78af9d436f8136f3b599" title="Click to view the MathML source">R<sub>pPbsub>span><span class="mathContainer hidden"><span class="mathCode">si114.gif" overflow="scroll">sub>RpPbsub>span>span>span> was calculated by comparing the <span id="mmlsi2" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si2.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=fc913c73eb2d293f338bf5eac1af122e" title="Click to view the MathML source">p<sub>Tsub>span><span class="mathContainer hidden"><span class="mathCode">si2.gif" overflow="scroll">sub>pTsub>span>span>span>-differential invariant cross section in p&ndash;Pb collisions to a pp reference at the same centre-of-mass energy, which was obtained by interpolating measurements at <span id="mmlsi116" class="mathmlsrc">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">ss="imgLazyJSB inlineImage" height="15" width="90" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315010151-si116.gif">script>style="vertical-align:bottom" width="90" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315010151-si116.gif">script><span class="mathContainer hidden"><span class="mathCode">si116.gif" overflow="scroll">sqrt>ssqrt>=2.76 TeVspan>span>span> and <span id="mmlsi126" class="mathmlsrc">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">ss="imgLazyJSB inlineImage" height="15" width="71" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315010151-si126.gif">script>style="vertical-align:bottom" width="71" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315010151-si126.gif">script><span class="mathContainer hidden"><span class="mathCode">si126.gif" overflow="scroll">sqrt>ssqrt>=7 TeVspan>span>span>. The <span id="mmlsi114" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si114.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=7870a314240d78af9d436f8136f3b599" title="Click to view the MathML source">R<sub>pPbsub>span><span class="mathContainer hidden"><span class="mathCode">si114.gif" overflow="scroll">sub>RpPbsub>span>span>span> is consistent with unity within uncertainties of about 25%, which become larger for <span id="mmlsi2" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si2.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=fc913c73eb2d293f338bf5eac1af122e" title="Click to view the MathML source">p<sub>Tsub>span><span class="mathContainer hidden"><span class="mathCode">si2.gif" overflow="scroll">sub>pTsub>span>span>span> below <span id="mmlsi10" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si10.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=ac3ba3974d40eee946a81b9971c005df" title="Click to view the MathML source">1 GeV/cspan><span class="mathContainer hidden"><span class="mathCode">si10.gif" overflow="scroll">1 GeVstretchy="false">/cspan>span>span>. The measurement shows that heavy-flavour production is consistent with binary scaling, so that a suppression in the high-<span id="mmlsi2" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315010151&_mathId=si2.gif&_user=111111111&_pii=S0370269315010151&_rdoc=1&_issn=03702693&md5=fc913c73eb2d293f338bf5eac1af122e" title="Click to view the MathML source">p<sub>Tsub>span><span class="mathContainer hidden"><span class="mathCode">si2.gif" overflow="scroll">sub>pTsub>span>span>span> yield in Pb&ndash;Pb collisions has to be attributed to effects induced by the hot medium produced in the final state. The data in p&ndash;Pb collisions are described by recent model calculations that include cold nuclear matter effects.

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