Počet záznamů: 1
Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at root s(NN)=2.76 TeV
- 1.
SYSNO ASEP 0384972 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at root s(NN)=2.76 TeV Tvůrce(i) Adam, J. (CZ)
Adamová, Dagmar (UJF-V) RID, ORCID, SAI
Bielčík, J. (CZ)
Bielčíková, Jana (UJF-V) RID, ORCID, SAI
Čepila, J. (CZ)
Křelina, M. (CZ)
Krus, M. (CZ)
Kushpil, Vasilij (UJF-V) ORCID, SAI
Kushpil, Svetlana (UJF-V) RID, ORCID, SAI
Mareš, Jiří A. (FZU-D) RID, ORCID
Pachr, M. (CZ)
Petráček, V. (CZ)
Petráň, M. (CZ)
Polák, Karel (FZU-D)
Pospíšil, V. (CZ)
Šmakal, R. (CZ)
Šumbera, Michal (UJF-V) RID, ORCID, SAI
Tlustý, D. (CZ)
Vajzer, Michal (UJF-V) RID
Wagner, V. (CZ)
Zach, Č. (CZ)
Závada, Petr (FZU-D) RID, ORCIDCelkový počet autorů 972 Zdroj.dok. Journal of High Energy Physics. - : Springer - ISSN 1126-6708
Roč. 2012, 053 (2012), 053/1-053/25Poč.str. 25 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova heavy ions Vědní obor RIV BG - Jaderná, atomová a mol. fyzika, urychlovače CEP LA08015 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UJF-V - RVO:61389005 ; FZU-D - RVO:68378271 UT WOS 000302412100053 DOI https://doi.org/10.1007/JHEP03(2012)053 Anotace The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at root s(NN) = 2.76 TeV has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p(t) particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-k(t) jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p(t) between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p(t) > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2013
Počet záznamů: 1