Azimuthal anisotropy of charged jet production in Pb-Pb collisions
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- 作者：ALICE Collaboration
- 刊名：Physics Letters B
- 出版年：2016
- 出版时间：10 February 2016
- 年：2016
- 卷：753
- 期：Complete
- 页码：511-525
- 全文大小：1092 K
文摘
We present measurements of the azimuthal dependence of charged jet production in central and semi-central pan id="mmlsi1" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si1.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=af3704114ca547b5a0517604f2f8bf64">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-S0370269315009958-si1.gif">pt>mg height="15" border="0" 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-S0370269315009958-si1.gif"> pt> pan class="mathContainer hidden">pan class="mathCode"><math altimg="si1.gif" overflow="scroll"><msqrt><msub><mrow><mi>smi>mrow><mrow><mi mathvariant="normal">NNmi>mrow>msub>msqrt><mo>=mo><mn>2.76mn><mtext> TeVmtext>math> pan> pan> pan> Pb–Pb collisions with respect to the second harmonic event plane, quantified as pan id="mmlsi3" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si3.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=a502abb3ef571b344332c237a661101d">mg class="imgLazyJSB inlineImage" height="20" width="37" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009958-si3.gif">pt>mg height="20" border="0" style="vertical-align:bottom" width="37" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315009958-si3.gif"> pt> pan class="mathContainer hidden">pan class="mathCode"><math altimg="si3.gif" overflow="scroll"><msubsup><mrow><mi>vmi>mrow><mrow><mn>2mn>mrow><mrow><mrow><mi mathvariant="normal">chmi>mrow><mtext> mtext><mrow><mi mathvariant="normal">jetmi>mrow>mrow>msubsup>math> pan> pan> pan>. Jet finding is performed employing the anti-pan id="mmlsi4" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si4.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=8bde6446c7e4c21bf5d7e21865c1dbd1" title="Click to view the MathML source">kT pan>pan class="mathContainer hidden">pan class="mathCode"><math altimg="si4.gif" overflow="scroll"><msub><mrow><mi>kmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math> pan> pan> pan> algorithm with a resolution parameter pan id="mmlsi5" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si5.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=f17e38ffc9bf41b4ab05059c2afe8ae2" title="Click to view the MathML source">R=0.2 pan>pan class="mathContainer hidden">pan class="mathCode"><math altimg="si5.gif" overflow="scroll"><mi>Rmi><mo>=mo><mn>0.2mn>math> pan> pan> pan> using charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations independently. Significant non-zero pan id="mmlsi3" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si3.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=a502abb3ef571b344332c237a661101d">mg class="imgLazyJSB inlineImage" height="20" width="37" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009958-si3.gif">pt>mg height="20" border="0" style="vertical-align:bottom" width="37" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315009958-si3.gif"> pt> pan class="mathContainer hidden">pan class="mathCode"><math altimg="si3.gif" overflow="scroll"><msubsup><mrow><mi>vmi>mrow><mrow><mn>2mn>mrow><mrow><mrow><mi mathvariant="normal">chmi>mrow><mtext> mtext><mrow><mi mathvariant="normal">jetmi>mrow>mrow>msubsup>math> pan> pan> pan> is observed in semi-central collisions (30–50% centrality) for pan id="mmlsi6" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si6.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=2fa6848d63c95add4d7a510e3f1234bd">mg class="imgLazyJSB inlineImage" height="20" width="145" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009958-si6.gif">pt>mg height="20" border="0" style="vertical-align:bottom" width="145" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269315009958-si6.gif"> pt> pan class="mathContainer hidden">pan class="mathCode"><math altimg="si6.gif" overflow="scroll"><mn>20mn><mo><mo><msubsup><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow><mrow><mrow><mi mathvariant="normal">chmi>mrow><mtext> mtext><mrow><mi mathvariant="normal">jetmi>mrow>mrow>msubsup><mo><mo><mn>90mn><mtext> GeVmtext><mo stretchy="false">/mo><mi>cmi>math> pan> pan> pan>. The azimuthal dependence of the charged jet production is similar to the dependence observed for jets comprising both charged and neutral fragments, and compatible with measurements of the pan id="mmlsi7" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si7.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=944f8b730bcac9bffb264c63b0082d73" title="Click to view the MathML source">v2 pan>pan class="mathContainer hidden">pan class="mathCode"><math altimg="si7.gif" overflow="scroll"><msub><mrow><mi>vmi>mrow><mrow><mn>2mn>mrow>msub>math> pan> pan> pan> of single charged particles at high pan id="mmlsi8" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009958&_mathId=si8.gif&_user=111111111&_pii=S0370269315009958&_rdoc=1&_issn=03702693&md5=d326eba5bc19e18321ee2db7aae3cd7f" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"><math altimg="si8.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi mathvariant="normal">Tmi>mrow>msub>math> pan> pan> pan>. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.