| Title: |
Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb–Pb collisions at s NN = 5.02 TeV |
| Authors: |
Acharya, S; Adamová, D; Adhya, SP; Adler, A; Adolfsson, J; Aggarwal, MM; Rinella, G Aglieri; Agnello, M; Agrawal, N; Ahammed, Z; Ahmad, S; Ahn, SU; Akindinov, A; Al-Turany, M; Alam, SN; Albuquerque, DSD; Aleksandrov, D; Alessandro, B; Alfanda, HM; Molina, R Alfaro; Ali, B; Ali, Y; Alici, A; Alkin, A; Alme, J; Alt, T; Altenkamper, L; Altsybeev, I; Anaam, MN; Andrei, C; Andreou, D; Andrews, HA; Andronic, A; Angeletti, M; Anguelov, V; Anson, C; Antičić, T; Antinori, F; Antonioli, P; Anwar, R; Apadula, N; Aphecetche, L; Appelshäuser, H; Arcelli, S; Arnaldi, R; Arratia, M; Arsene, IC; Arslandok, M; Augustinus, A; Averbeck, R; Aziz, S; Azmi, MD; Badalà, A; Baek, YW; Bagnasco, S; Bai, X; Bailhache, R; Bala, R; Baldisseri, A; Ball, M; Balouza, S; Baral, RC; Barbera, R; Barioglio, L; Barnaföldi, GG; Barnby, LS; Barret, V; Bartalini, P; Barth, K; Bartsch, E; Baruffaldi, F; Bastid, N; Basu, S; Batigne, G; Batyunya, B; Batzing, PC; Bauri, D; Alba, JL Bazo; Bearden, IG; Bedda, C; Behera, NK; Belikov, I; Bellini, F; Bellwied, R; Belyaev, V; Bencedi, G; Beole, S; Bercuci, A; Berdnikov, Y; Berenyi, D; Bertens, RA; Berzano, D; Besoiu, MG; Betev, L; Bhasin, A; Bhat, IR; Bhat, MA; Bhatt, H; Bhattacharjee, B; Bianchi, A |
| Source: |
Physics Letters B, vol 804 |
| Publisher Information: |
eScholarship, University of California |
| Publication Year: |
2020 |
| Collection: |
University of California: eScholarship |
| Subject Terms: |
5106 Nuclear and Plasma Physics (for-2020); 5107 Particle and High Energy Physics (for-2020); 5110 Synchrotrons and Accelerators (for-2020); 51 Physical Sciences (for-2020); 0105 Mathematical Physics (for); 0201 Astronomical and Space Sciences (for); 0202 Atomic; Molecular; Nuclear; Particle and Plasma Physics (for); Nuclear & Particles Physics (science-metrix); 49 Mathematical sciences (for-2020) |
| Description: |
The differential invariant yield as a function of transverse momentum ( p T ) of electrons from semileptonic heavy-flavour hadron decays was measured at midrapidity in central (0–10%), semi-central (30–50%) and peripheral (60–80%) lead–lead (Pb–Pb) collisions at s NN = 5.02 TeV in the p T intervals 0.5–26 GeV/c (0–10% and 30–50%) and 0.5–10 GeV/c (60–80%). The production cross section in proton–proton (pp) collisions at s = 5.02 TeV was measured as well in 0.5 < p T < 10 GeV/c and it lies close to the upper band of perturbative QCD calculation uncertainties up to p T = 5 GeV/c and close to the mean value for larger p T . The modification of the electron yield with respect to what is expected for an incoherent superposition of nucleon–nucleon collisions is evaluated by measuring the nuclear modification factor R AA . The measurement of the R AA in different centrality classes allows in-medium energy loss of charm and beauty quarks to be investigated. The R AA shows a suppression with respect to unity at intermediate p T , which increases while moving towards more central collisions. Moreover, the measured R AA is sensitive to the modification of the parton distribution functions (PDF) in nuclei, like nuclear shadowing, which causes a suppression of the heavy-quark production at low p T in heavy-ion collisions at LHC. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
unknown |
| Relation: |
qt7d51x2xm; https://escholarship.org/uc/item/7d51x2xm; https://escholarship.org/content/qt7d51x2xm/qt7d51x2xm.pdf |
| DOI: |
10.1016/j.physletb.2020.135377 |
| Availability: |
https://escholarship.org/uc/item/7d51x2xm; https://escholarship.org/content/qt7d51x2xm/qt7d51x2xm.pdf; https://doi.org/10.1016/j.physletb.2020.135377 |
| Rights: |
public |
| Accession Number: |
edsbas.477004CF |
| Database: |
BASE |