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Workshop on the determination of centrality in pA collisions at the LHC
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Europe/Zurich
4/3-006 - TH Conference Room (CERN)
Description
The analysis of pPb collisions allows for the study of cold nuclear effects in order to establish a baseline for the interpretation of heavy ion results. Nuclear modification factors in minimum bias pPb collisions with respect to the pp reference have been measured at LHC for a large variety of probes ranging from inclusive hadrons to heavy flavors and jets. To measure the centrality dependence of these observables, the binary scaling factors (Ncoll) between pp and p-Pb have to be determined for each centrality class. Since the pA@LHC workshop organized in June 2012 in front of the first pPb data taking at the LHC, it has become clear that due to the looser correlation between centrality estimators and Ncoll, centrality determination in pPb is a delicate task. Kinematic biases on the centrality dependent observables can not be excluded and need special attention. Two recent conferences, IS2013 and Hard Probes 2013, had discussion sessions on centrality determination in p(d)A collisions as part of their program demonstrating the importance of this topic. These discussions have not yet come to a conclusion. The procedures developped by the LHC experiments are quite different, while first preliminary results on centrality dependent nuclear modification factors have already been presented. The aim of this Workshop is to start a more formal discussion, to be carried on by the studies of this inter-experiments Working Group, with the goal of formulating a common approach to the definition, determination and use of centrality in pA events.
Working Group conveners:
ALICE: Andreas Morsch (chair)
ATLAS: Brian Cole and Dennis Perepelitsa
CMS: Shengquan Tuo
LHCb: Michael Schmelling and Burkhard Schmidt
Theory: Carlos Salgado
Working Group conveners:
ALICE: Andreas Morsch (chair)
ATLAS: Brian Cole and Dennis Perepelitsa
CMS: Shengquan Tuo
LHCb: Michael Schmelling and Burkhard Schmidt
Theory: Carlos Salgado
Participants
Alberica Toia
Alexander Borissov
Alexander Duplinskiy
Alexander Philipp Kalweit
Alice Ohlson
Alis Rodriguez Manso
Andrea Dubla
Andreas Morsch
Anna Julia Zsigmond
Antonio Uras
attilio tarantola
Brian Cole
Carlos Salgado
Chiara Oppedisano
Christopher Ryan Edwards-Bruner
Constantinos Loizides
Cvetan Valeriev Cheshkov
Daniil Ponomarenko
Dennis Perepelitsa
Doga Can Gulhan
Emilia Leogrande
Ferenc Siklér
Friederike Bock
Gian Michele Innocenti
Grigori Feofilov
Hannes Wessels
Igor Altsybeev
Jan Fiete Grosse-Oetringhaus
Jan Rak
Jason Kamin
Jonas Anielski
Ken Oyama
Ladislav Sandor
Leonardo Milano
Mark Strikman
Marta Verweij
Mateusz Ploskon
Matthew Nguyen
Michael Murray
Michael Schmelling
Michael Weber
Michele Floris
Mohammed Mahmoud Mohammed
Mohd. Danish Azmi
Nora De Marco
Pedro Ladron De Guevara
Per-Ivar Lønne
Peter Hristov
Pietro Cortese
Raghav Kunnawalkam Elayavalli
Riccardo Russo
Rudiger Haake
Ryan White
Shengquan Tuo
Sunil Manohar Dogra
Vladimir Kovalenko
William Brooks
Yen-Jie Lee
Yetkin Yilmaz
