Počet záznamů: 1
Dielectron production in proton-proton collisions at root s=7 TeV
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SYSNO ASEP 0494425 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Dielectron production in proton-proton collisions at root s=7 TeV Tvůrce(i) Acharya, S. (IN)
Acosta, F. T. (US)
Adamová, Dagmar (UJF-V) RID, ORCID, SAI
Bielčík, J. (CZ)
Bielčíková, Jana (UJF-V) RID, ORCID, SAI
Broz, M. (CZ)
Contreras, J. G. (CZ)
Horák, D. (CZ)
Křížek, Filip (UJF-V) RID, ORCID, SAI
Kučera, Vít (UJF-V) RID
Kushpil, Svetlana (UJF-V) RID, ORCID, SAI
Lavička, R. (CZ)
Mareš, Jiří A. (FZU-D) RID, ORCID
Petráček, V. (CZ)
Šumbera, Michal (UJF-V) RID, ORCID, SAI
Závada, Petr (FZU-D) RID, ORCIDCelkový počet autorů 1016 Číslo článku 064 Zdroj.dok. Journal of High Energy Physics. - : Springer - ISSN 1029-8479
Roč. 2018, č. 9 (2018)Poč.str. 47 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova ALICE collaboration ; heavy ion experiments Vědní obor RIV BG - Jaderná, atomová a mol. fyzika, urychlovače Obor OECD Nuclear physics Vědní obor RIV – spolupráce Fyzikální ústav - Elementární částice a fyzika vys. energií CEP LTT17018 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora FZU-D - RVO:68378271 ; UJF-V - RVO:61389005 UT WOS 000444678800007 EID SCOPUS 85053272489 DOI 10.1007/JHEP09(2018)064 Anotace The first measurement of e(+)e(-) pair production at mid-rapidity (vertical bar eta vertical bar(e) < 0.8) in pp collisions at root s = 7TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m(ee )< 3.3 GeV/c(2)), the pair transverse momentum (p(T,ee) < 8 GeV/c), and the pair transverse impact parameter (DCA(ee)), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < m(ee) < 1.1 GeV/c(2)), prompt and non-prompt e(+)e(-) sources can be separated via the DCA(ee). In the intermediate-mass region (1.1 < m(ee) < 2.7 GeV/c(2)), a double-differential fit to the data in m(ee) and p(T,ee) and a fit of the DCA(ee) distribution allow the total cc and bb cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional m(ee) and p(T,ee) spectra, as well as the shape , of the DCA(ee) distribution, reasonably well. However, differences in the c (c) over bar and b (b) over bar cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < p(T) < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2019
Počet záznamů: 1