Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at
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- 作者：ALICE Collaboration
- 刊名：Physics Letters B
- 出版年：2016
- 出版时间：10 September 2016
- 年：2016
- 卷：760
- 期：Complete
- 页码：720-735
- 全文大小：2572 K
文摘
The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (pan id="mmlsi2" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si2.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=a6bcb7b69469d31dc0318f66fec13f58" title="Click to view the MathML source">−0.5<y<0 pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>) in p–Pb collisions at pan id="mmlsi1" class="mathmlsrc">pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=1c2ae747013ad8d2a2bc1ccb56bc8b85">![View the MathML source]()
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p://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316303914-si1.gif"> pt>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> using the ALICE detector at the LHC. Exploiting particle identification capabilities at high transverse momentum (pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>), the previously published pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> spectra have been extended to include measurements up to 20 GeV/c for seven event multiplicity classes. The pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> spectra for pp collisions at pan id="mmlsi11" class="mathmlsrc">pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=0e57ad0bb248f456bc87959bd0554927">![View the MathML source]()
p: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316303914-si11.gif">pt>p://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316303914-si11.gif"> pt>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>, needed to interpolate a pp reference spectrum, have also been extended up to 20 GeV/c to measure the nuclear modification factor (pan id="mmlsi6" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si6.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=bb93f544fc6743d67eb3ca7cb0ea856a" title="Click to view the MathML source">RpPb pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>) in non-single diffractive p–Pb collisions.p><p id="sp0170">At intermediate transverse momentum (pan id="mmlsi108" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si108.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=9f4f6878d76df75bc68ca19a9ddb846a" title="Click to view the MathML source">2<pT<10 GeV/c pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>) the proton-to-pion ratio increases with multiplicity in p–Pb collisions, a similar effect is not present in the kaon-to-pion ratio. The pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> dependent structure of such increase is qualitatively similar to those observed in pp and heavy-ion collisions. At high pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> (pan id="mmlsi8" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si8.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=d0ca309d8ec4199226ff18fec4a5eeb6" title="Click to view the MathML source">>10 GeV/c pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>), the particle ratios are consistent with those reported for pp and Pb–Pb collisions at the LHC energies.p><p id="sp0180">At intermediate pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> the (anti)proton pan id="mmlsi6" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si6.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=bb93f544fc6743d67eb3ca7cb0ea856a" title="Click to view the MathML source">RpPb pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si3.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=13414abcb31dd6dbfab981dd0084def3" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> the charged pion, kaon and (anti)proton pan id="mmlsi6" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303914&_mathId=si6.gif&_user=111111111&_pii=S0370269316303914&_rdoc=1&_issn=03702693&md5=bb93f544fc6743d67eb3ca7cb0ea856a" title="Click to view the MathML source">RpPb pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> are consistent with unity within statistical and systematic uncertainties.