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

B. Abelev,J. Adam,D. Adamová,A. M. Adare,M. M. Aggarwal,G. Aglieri Rinella,A. G. Agocs,A. Agostinelli,S. Aguilar Salazar,Z. Ahammed,N. Ahmad,A. Ahmad Masoodi,S. U. Ahn,A. Akindinov,D. Aleksandrov,B. Alessandro,R. Alfaro Molina,A. Alici,A. Alkin,E. Almaráz Aviña,T. Alt,V. Altini,S. Altinpinar,I. Altsybeev,C. Andrei,A. Andronic,V. Anguelov,J. Anielski,C. Anson,T. Antičić,F. Antinori,P. Antonioli,L. Aphecetche,H. Appelshäuser,N. Arbor,S. Arcelli,A. Arend,N. Armesto,R. Arnaldi,T. Aronsson,I. C. Arsene,M. Arslandok,A. Asryan,A. Augustinus,R. Averbeck,T. C. Awes,J. Äystö,M. D. Azmi,M. Bach,A. Badalà,Y. W. Baek,R. Bailhache,R. Bala,R. Baldini Ferroli,A. Baldisseri,A. Baldit,F. Baltasar Dos Santos Pedrosa,J. Bán,R. C. Baral,R. Barbera,F. Barile,G. G. Barnaföldi,L. S. Barnby,V. Barret,J. Bartke,M. Basile,N. Bastid,B. Bathen,G. Batigne,B. Batyunya,C. Baumann,I. G. Bearden,H. Beck,I. Belikov,F. Bellini,R. Bellwied,E. Belmont-Moreno,S. Beole,I. Berceanu,A. Bercuci,Y. Berdnikov,D. Berenyi,C. 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Journal of High Energy Physics（2012）

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Abstract

The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at √(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

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Key words

Heavy Ions

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