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 (mmlsi2" class="mathmlsrc">mulatext 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">pTmathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math>) in minimum-bias p–Pb collisions at mmlsi1" class="mathmlsrc">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">mg class="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">mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msqrt><msub><mrow><mi>smi>mrow><mrow><mi mathvariant="normal">NNmi>mrow>msub>msqrt><mo>=mo><mn>5.02mn><mtext> mtext><mtext>TeVmtext>math> using the ALICE detector at the LHC. The measurement covers the mmlsi2" class="mathmlsrc">mulatext 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">pTmathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math> interval mmlsi117" class="mathmlsrc">mulatext 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<pT<12 GeV/cmathContainer hidden">mathCode"><math altimg="si117.gif" overflow="scroll"><mn>0.5mn><mo><mo><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub><mo><mo><mn>12mn><mtext> mtext><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi>math> and the rapidity range mmlsi129" class="mathmlsrc">mulatext 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<ycms<0.135mathContainer hidden">mathCode"><math altimg="si129.gif" overflow="scroll"><mo>&minus;mo><mn>1.065mn><mo><mo><msub><mrow><mi>ymi>mrow><mrow><mi mathvariant="normal">cmsmi>mrow>msub><mo><mo><mn>0.135mn>math> 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 mmlsi114" class="mathmlsrc">mulatext 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">RpPbmathContainer hidden">mathCode"><math altimg="si114.gif" overflow="scroll"><msub><mrow><mi>Rmi>mrow><mrow><mi mathvariant="normal">pPbmi>mrow>msub>math> was calculated by comparing the mmlsi2" class="mathmlsrc">mulatext 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">pTmathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math>-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 mmlsi116" class="mathmlsrc">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">mg class="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">mathContainer hidden">mathCode"><math altimg="si116.gif" overflow="scroll"><msqrt><mi>smi>msqrt><mo>=mo><mn>2.76mn><mtext> mtext><mtext>TeVmtext>math> and mmlsi126" class="mathmlsrc">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">mg class="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">mathContainer hidden">mathCode"><math altimg="si126.gif" overflow="scroll"><msqrt><mi>smi>msqrt><mo>=mo><mn>7mn><mtext> mtext><mtext>TeVmtext>math>. The mmlsi114" class="mathmlsrc">mulatext 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">RpPbmathContainer hidden">mathCode"><math altimg="si114.gif" overflow="scroll"><msub><mrow><mi>Rmi>mrow><mrow><mi mathvariant="normal">pPbmi>mrow>msub>math> is consistent with unity within uncertainties of about 25%, which become larger for mmlsi2" class="mathmlsrc">mulatext 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">pTmathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math> below mmlsi10" class="mathmlsrc">mulatext 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/cmathContainer hidden">mathCode"><math altimg="si10.gif" overflow="scroll"><mn>1mn><mtext> mtext><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi>math>. The measurement shows that heavy-flavour production is consistent with binary scaling, so that a suppression in the high-mmlsi2" class="mathmlsrc">mulatext 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">pTmathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math> 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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