https://scholars.lib.ntu.edu.tw/handle/123456789/575257
標題: | Charged-particle nuclear modification factors in PbPb and pPb collisions at √sNN=5.02 TeV | 作者: | PAO-TI CHANG et al. YEE HSIUNG et al. KAI-FENG CHEN et al. RONG-SHYANG LU et al. WEI-SHU HOU et al. Stathes Paganis |
公開日期: | 2017 | 卷: | 2017 | 期: | 4 | 來源出版物: | Journal of High Energy Physics | 摘要: | The spectra of charged particles produced within the pseudorapidity window |η| < 1 at sNN=5.02 TeV are measured using 404 μb?1 of PbPb and 27.4 pb?1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < pT< 400 GeV in pp and 0.7 < pT< 400 GeV in PbPb collisions. The corresponding nuclear modification factor, RAA, is measured in bins of collision centrality. The RAA in the 5% most central collisions shows a maximal suppression by a factor of 7-8 in the pT region of 6-9 GeV. This dip is followed by an increase, which continues up to the highest pT measured, and approaches unity in the vicinity of pT = 200 GeV. The RAA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, RpA, up to 120 GeV. For pT> 20 GeV, RpA exhibits weak momentum dependence and shows a moderate enhancement above unity.[Figure not available: see fulltext.] ? 2017, The Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85017560557&doi=10.1007%2fJHEP04%282017%29039&partnerID=40&md5=a4a51ae57326636554065beaf1b0307f https://scholars.lib.ntu.edu.tw/handle/123456789/575257 |
ISSN: | 11266708 | DOI: | 10.1007/JHEP04(2017)039 |
顯示於: | 物理學系 |
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