Naslov
Erratum to “Rapidity and transverse momentum dependence of inclusive J/ψJ/ψ production in pp collisions at root s = 7 TeV

Autori
Aamodt, K. ; Antičić, Tome ; Gotovac, Sven ; Mudnić, Eugen ; Nikolić, Vedran ; Šuša, Tatjana ; Vicković, Linda ; Zynovyev, M.

Izvornik
Physics letters. B (0370-2693) 718 (2012), 2; 692-698

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, ispravak, ostalo

Ključne riječi
ALICE; LHC; J/Psi; 7 TeV; p+p; erratum

Sažetak
We have identified a bias in the calculation of the cross section of J/ψJ/ψ production measured in the e+e−e+e− channel at central rapidity (|y|<0.9|y|<0.9) [1]. The acceptance and efficiency corrections were evaluated using a Monte Carlo simulation, based on PYTHIA [2] and [3], which did not include the radiative decays of J/ψJ/ψ (J/ψ→e+e−γJ/ψ→e+e−γ). In these decays the reconstructed dielectron invariant mass, me+e−me+e−, is biased towards smaller values than the nominal J/ψJ/ψ mass, since the photon contribution is neglected. As a consequence, the fraction of signal events in the me+e−me+e− range 2.92–3.16 GeV/c2 was overestimated by about 10%. Moreover, the requirement of the transverse momentum of the daughter electrons being larger than 1 GeV/c is more selective for radiative than non-radiative J/ψJ/ψ decays. Therefore, the J/ψJ/ψ acceptance was also overestimated by about 5%.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
ALICE Collaboration.

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