Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at sqrt(sNN)=2.76 TeV

Abelev, B.; ...; Antičić, Tome; ...; Gotovac, Sven; ...; Mudnić, Eugen; ...; Šuša, Tatjana; ...; Vicković, Linda; ...; Zynovyev, M.

doi:10.1007/JHEP03(2012)053

Pregled bibliografske jedinice broj: 592998

Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at sqrt(sNN)=2.76 TeV

Abelev, B.; ...; Antičić, Tome; ...; Gotovac, Sven; ...; Mudnić, Eugen; ...; Šuša, Tatjana; ... et al.

Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at sqrt(sNN)=2.76 TeV // The Journal of high energy physics, (2012), 3; 53-1 doi:10.1007/JHEP03(2012)053 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 592998 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at sqrt(sNN)=2.76 TeV

Autori
Abelev, B. ; ... ; Antičić, Tome ; ... ; Gotovac, Sven ; ... ; Mudnić, Eugen ; ... ; Šuša, Tatjana ; ... ; Vicković, Linda ; ... ; Zynovyev, M.

Izvornik
The Journal of high energy physics (1126-6708) (2012), 3; 53-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ALICE; LHC; CERN; PbPb; 2.76 TeV; Fluctuations

Sažetak
The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at sqrt(sNN)=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 pt particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-kt 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 pt between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with pt > 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The ALICE Collaboration

POVEZANOST RADA

Projekti:
098-0982887-2878 - Eksperimentalna fizika na LHC energijama (Kadija, Krešo, MZOS ) ( CroRIS)

Ustanove:
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Institut "Ruđer Bošković", Zagreb

Profili:

Tatjana Šuša (autor)