Measurement of electrons from beauty-hadron decays in p-Pb collisions at TeV and Pb-Pb collisions at TeV
- JHEP 07 (2017) 052
- Published: Jul 11, 2017
- 1609.03898 [nucl-ex]
- CERN-EP-2016-222
Citations per year
TeV and in 1.3 < p < 8 GeV/c in the 20% most central Pb-Pb collisions at TeV. The pp reference spectra at TeV and TeV, needed for the calculation of the nuclear modification factors R and R, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at TeV. In the p interval 3 < p < 8 GeV/c, a suppression of the yield of electrons from beauty-hadron decays is observed in Pb-Pb compared to pp collisions. Towards lower p, the R values increase with large systematic uncertainties. The R is consistent with unity within systematic uncertainties and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured R and these calculations indicate that cold nuclear matter effects are small at high transverse momentum also in Pb-Pb collisions. Therefore, the observed reduction of R below unity at high p may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions.
< 8 GeV/c in minimum-bias p-Pb collisions at- 35 pages, 7 captioned figures, 3 tables, authors from page 29, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3055
- Heavy Ion Experiments
- electron
- bottom: decay
- hadron: decay
- semileptonic decay
- nuclear matter: effect
- transverse momentum: high
- cross section: scaling
- rapidity
- Bjorken
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