Measurement of $W^\pm $ boson production in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02~\text {Te}\text {V}$ with the ATLAS detector

Aad, Georges; Abbott, Brad; Abbott, Dale Charles; Abed Abud, Adam; Abeling, Kira; Abhayasinghe, Deshan Kavishka; Abidi, Syed Haider; Abouzeid, Ossama; Abraham, Nicola; Abramowicz, Halina

doi:10.1140/epjc/s10052-019-7439-3

Measurement of $W^\pm$ boson production in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02~\text {Te}\text {V}$ with the ATLAS detector

ATLAS

Collaboration

Jul 24, 2019

32 pages

Published in:

Eur.Phys.J.C 79 (2019) 11, 935

Published: Nov 18, 2019

e-Print:

1907.10414 [nucl-ex]

DOI:

10.1140/epjc/s10052-019-7439-3 (publication)

Report number:

CERN-EP-2019-123

Experiments:

CERN-LHC-ATLAS

View in:

datasets

reference search59 citations

Citations per year

Abstract: (Springer)

A measurement of

W^\pm

boson production in Pb+Pb collisions at

\sqrt{s_\mathrm {NN}} = 5.02~\text {Te}\text {V}

is reported using data recorded by the ATLAS experiment at the LHC in 2015, corresponding to a total integrated luminosity of

0.49\,\mathrm {nb^{-1}}

. The

W^\pm

bosons are reconstructed in the electron or muon leptonic decay channels. Production yields of leptonically decaying

W^\pm

bosons, normalised by the total number of minimum-bias events and the nuclear thickness function, are measured within a fiducial region defined by the detector acceptance and the main kinematic requirements. These normalised yields are measured separately for

W^+

and

W^-

bosons, and are presented as a function of the absolute value of pseudorapidity of the charged lepton and of the collision centrality. The lepton charge asymmetry is also measured as a function of the absolute value of lepton pseudorapidity. In addition, nuclear modification factors are calculated using the

W^\pm

boson production cross-sections measured in pp collisions. The results are compared with predictions based on next-to-leading-order calculations with CT14 parton distribution functions as well as with predictions obtained with the EPPS16 and nCTEQ15 nuclear parton distribution functions. No dependence of normalised production yields on centrality and a good agreement with predictions are observed for mid-central and central collisions. For peripheral collisions, the data agree with predictions within 1.7 (0.9) standard deviations for

W^-

(

W^+

) bosons.

Note:

15 figures, 1 table. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2018-25/

parton: distribution function
W: production
cross section: measured
lepton: rapidity
lepton: charge: asymmetry
muon: leptonic decay
p p: scattering
higher-order: 1
model: Glauber
ATLAS

References(78)

Figures(28)

[1]

Strongly coupled quark-gluon plasma in heavy ion collisions

Edward Shuryak
(
- SUNY, Stony Brook
)

- Rev.Mod.Phys. 89 (2017) 035001
•
e-Print:
- 1412.8393
•
DOI:
- 10.1103/RevModPhys.89.035001

[2]

Quark gluon plasma and color glass condensate at RHIC? The Perspective from the BRAHMS experiment

BRAHMS

Collaboration

•

I. Arsene
(
- Bucharest U.
)

et al.

- Nucl.Phys.A 757 (2005) 1-27
•
e-Print:
- nucl-ex/0410020
•
DOI:
- 10.1016/j.nuclphysa.2005.02.130

[3]

The PHOBOS perspective on discoveries at RHIC

PHOBOS

Collaboration

•

B.B. Back
(
- Argonne
)

et al.

- Nucl.Phys.A 757 (2005) 28-101
•
e-Print:
- nucl-ex/0410022
•
DOI:
- 10.1016/j.nuclphysa.2005.03.084

[4]

Experimental and theoretical challenges in the search for the quark gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions

STAR

Collaboration

•

John Adams
(
- Birmingham U.
)

et al.

- Nucl.Phys.A 757 (2005) 102-183
•
e-Print:
- nucl-ex/0501009
•
DOI:
- 10.1016/j.nuclphysa.2005.03.085

[5]

Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration

PHENIX

Collaboration

•

K. Adcox
(
- Vanderbilt U.
)

et al.

- Nucl.Phys.A 757 (2005) 184-283
•
e-Print:
- nucl-ex/0410003
•
DOI:
- 10.1016/j.nuclphysa.2005.03.086

[6]

Jet physics in heavy-ion collisions

Yacine Mehtar-Tani
(
- Saclay, SPhT
)
,
Jose Guilherme Milhano
(
- CERN and
- Lisbon, IST
)
,
Konrad Tywoniuk
(
- Barcelona U., ECM and
- ICC, Barcelona U.
)

- Int.J.Mod.Phys.A 28 (2013) 1340013
•
e-Print:
- 1302.2579
•
DOI:
- 10.1142/S0217751X13400137

[7]

Jet quenching in high-energy heavy-ion collisions

Guang-You Qin
(
- Hua-Zhong Normal U. and
- Hua-Zhong Normal U., LQLP
)
,
Xin-Nian Wang
(
- Hua-Zhong Normal U. and
- Hua-Zhong Normal U., LQLP and
- LBNL, NSD
)

- Int.J.Mod.Phys.E 24 (2015) 11, 1530014,
- Chapter of the book "Quark-Gluon Plasma 5", edited by Xin-Nian Wang, World Scientific, p. 309-372, 2016
•
e-Print:
- 1511.00790
•
DOI:
- 10.1142/S0218301315300143