Centrality and pseudorapidity dependence of the transverse energy density in pPb collisions ats root s(NN)=5.02 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The almost hermetic coverage of the CMS detector is used to measure the distribution of transverse energy,
E
T
, over 13.2 units of pseudorapidity,
η
, for
p
Pb
collisions at a center-of-mass energy per nucleon pair of
√
s
NN
=
5.02
TeV
. The huge angular acceptance exploits the fact that the CASTOR calorimeter at
−
6.6
<
η
<
−
5.2
is effectively present on both sides of the colliding system because of a switch in the proton-going and lead-going beam directions. This wide acceptance enables the study of correlations between well-separated angular regions and makes the measurement a particularly powerful test of event generators. For minimum bias
p
Pb
collisions the maximum value of
d
E
T
/
d
η
is
22
GeV
, which implies an
E
T
per participant nucleon pair comparable to that of peripheral PbPb collisions at
√
s
NN
=
2.76
TeV
. The increase of
d
E
T
/
d
η
with centrality is much stronger for the lead-going side than for the proton-going side. The
η
dependence of
d
E
T
/
d
η
is sensitive to the
η
range in which the centrality variable is defined. Several modern generators are compared to these results but none is able to capture all aspects of the
η
and centrality dependence of the data and the correlations observed between different
η
regions.
E
T
, over 13.2 units of pseudorapidity,
η
, for
p
Pb
collisions at a center-of-mass energy per nucleon pair of
√
s
NN
=
5.02
TeV
. The huge angular acceptance exploits the fact that the CASTOR calorimeter at
−
6.6
<
η
<
−
5.2
is effectively present on both sides of the colliding system because of a switch in the proton-going and lead-going beam directions. This wide acceptance enables the study of correlations between well-separated angular regions and makes the measurement a particularly powerful test of event generators. For minimum bias
p
Pb
collisions the maximum value of
d
E
T
/
d
η
is
22
GeV
, which implies an
E
T
per participant nucleon pair comparable to that of peripheral PbPb collisions at
√
s
NN
=
2.76
TeV
. The increase of
d
E
T
/
d
η
with centrality is much stronger for the lead-going side than for the proton-going side. The
η
dependence of
d
E
T
/
d
η
is sensitive to the
η
range in which the centrality variable is defined. Several modern generators are compared to these results but none is able to capture all aspects of the
η
and centrality dependence of the data and the correlations observed between different
η
regions.
Date Issued
2019-08-01
Date Acceptance
2019-08-01
Citation
Physical Review C - Nuclear Physics, 2019, 100 (2), pp.024902-1-024902-20
ISSN
0556-2813
Publisher
American Physical Society
Start Page
024902-1
End Page
024902-20
Journal / Book Title
Physical Review C - Nuclear Physics
Volume
100
Issue
2
Copyright Statement
©2019 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000478045600005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Nuclear
Physics
PLUS AU COLLISIONS
P-PB COLLISIONS
NUCLEUS COLLISIONS
RAPIDITY LOSS
MULTIPLICITY
COLLECTIVITY
Publication Status
Published
Article Number
ARTN 024902
Date Publish Online
2019-08-01