Long-range and short-range dihadron angular correlations in central PbPb collisions at root s(NN)=2.76 TeV

Serguei Chatrchyan; Pierluigi Bortignon; Lea Caminada; Nicolas Chanon; Zhiling Chen; Sergio Cittolin; Günther Dissertori; Michael Dittmar; Jürg Eugster; Klaus Freudenreich; Christoph Grab; Wieland Hintz; Pierre Lecomte; Werner Lustermann; Carmelo Marchica; Pablo Martinez Ruiz Del Arbol; Paolo Meridiani; Predrag Milenovic; Filip Moortgat; Christoph Nägeli; Pascal Nef; Francesca Nessi-Tedaldi; Luc Pape; Felicitas Pauss; Thomas Punz; Andrea Rizzi; Frédéric J Ronga; Marco Rossini; Leonardo Sala; Ann-Karin Sanchez; Marie-Christine Sawley; Benjamin Stieger; Ludwig Tauscher; Alessandro Thea; Konstantinos Theofilatos; Daniel Treille; Christina Urscheler; Rainer Wallny; Marc Weber; Joanna Weng; Lukas Wehrli; CMS Collaboration

doi:10.1007/JHEP07(2011)076

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Long-range and short-range dihadron angular correlations in central PbPb collisions at root s(NN)=2.76 TeV

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Long-range and short-range dihadron angular correlations in central PbPb collisions at root s(NN)=2.76 TeV

Serguei Chatrchyan, Pierluigi Bortignon, Lea Caminada, Nicolas Chanon, Zhiling Chen, Sergio Cittolin, Günther Dissertori, Michael Dittmar, Jürg Eugster, Klaus Freudenreich, …

The journal of high energy physics, Vol.2011(7), 76

07/01/2011

DOI: 10.1007/JHEP07(2011)076

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Abstract

First measurements of dihadron correlationsfor charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76TeV over a broad range in relative pseudorapidity (∆η) and the full range of relative azimuthal angle (∆ϕ). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (∆ϕ ≈ π) azimuthal correlation is observed at all ∆η, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in ∆η are observed for particles with similar ϕ values. This phenomenon, also known as the “ridge”, persists up to at least |∆η| = 4. For particles with transverse momenta (p T) of2-4 GeV/c, the ridge is found to be most prominent when these particles are correlated with particles of p T = 2-6 GeV/c, and to be much reduced when paired with particles of p T = 10-12 GeV/c.

Hadron

Hadron Scattering

Nuclear Experiment

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Title: Subtitle: Long-range and short-range dihadron angular correlations in central PbPb collisions at root s(NN)=2.76 TeV
Creators: Serguei Chatrchyan
Pierluigi Bortignon
Lea Caminada
Nicolas Chanon
Zhiling Chen
Sergio Cittolin
Günther Dissertori
Michael Dittmar
Jürg Eugster
Klaus Freudenreich
Christoph Grab
Wieland Hintz
Pierre Lecomte
Werner Lustermann
Carmelo Marchica
Pablo Martinez Ruiz Del Arbol
Paolo Meridiani
Predrag Milenovic
Filip Moortgat
Christoph Nägeli
Pascal Nef
Francesca Nessi-Tedaldi
Luc Pape
Felicitas Pauss
Thomas Punz
Andrea Rizzi
Frédéric J Ronga
Marco Rossini
Leonardo Sala
Ann-Karin Sanchez
Marie-Christine Sawley
Benjamin Stieger
Ludwig Tauscher
Alessandro Thea
Konstantinos Theofilatos
Daniel Treille
Christina Urscheler
Rainer Wallny
Marc Weber - RWTH Aachen University
Joanna Weng
Lukas Wehrli
CMS Collaboration
Contributors: C. R Newsom (Contributor) - University of Iowa, Physics and Astronomy
Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The journal of high energy physics, Vol.2011(7), 76
Publisher: Springer
DOI: 10.1007/JHEP07(2011)076
ISSN: 1029-8479
eISSN: 1029-8479
Language: English
Date published: 07/01/2011
Academic Unit: Physics and Astronomy
Record Identifier: 9984199745502771

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