Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

CMS Collaboration; Freya Blekman; Emil Sørensen Bols; Simranjit Singh Chhibra; Jorgen D'Hondt; Jarne Theo De Clercq; Denys Lontkovskyi; Steven Lowette; Ivan Marchesini; Seth Moortgat; Alexander Morton; Quentin Python; Stefaan Tavernier; Walter Van Doninck; Petra Van Mulders

doi:10.1103/physrevlett.127.102002

Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

CMS Collaboration, Freya Blekman, Emil Sørensen Bols, Simranjit Singh Chhibra, Jorgen D'Hondt, Jarne Theo De Clercq, Denys Lontkovskyi, Steven Lowette, Ivan Marchesini, Seth Moortgat, Alexander Morton, Quentin Python, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders

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Abstract

The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.

Original language	English
Article number	102002
Number of pages	19
Journal	Phys. Rev. Lett.
Volume	127
Issue number	10
DOIs	https://doi.org/10.1103/physrevlett.127.102002
Publication status	Published - 31 Aug 2021

Bibliographical note

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-003 (CMS Public Pages)

Keywords

hep-ex
nucl-ex

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10.1103/physrevlett.127.102002Licence: CC BY

2103.14089v2Submitted manuscript, 435 KBLicence: CC BY
75990664Final published version, 588 KBLicence: CC BY

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Collaboration, CMS., Blekman, F., Bols, E. S., Chhibra, S. S., D'Hondt, J., De Clercq, J. T., Lontkovskyi, D., Lowette, S., Marchesini, I., Moortgat, S., Morton, A., Python, Q., Tavernier, S., Van Doninck, W., & Van Mulders, P. (2021). Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV. Phys. Rev. Lett., 127(10), Article 102002. https://doi.org/10.1103/physrevlett.127.102002

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title = "Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV",

abstract = " The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model. ",

keywords = "hep-ex, nucl-ex",

author = "CMS Collaboration and Freya Blekman and Bols, {Emil S{\o}rensen} and Chhibra, {Simranjit Singh} and Jorgen D'Hondt and {De Clercq}, {Jarne Theo} and Denys Lontkovskyi and Steven Lowette and Ivan Marchesini and Seth Moortgat and Alexander Morton and Quentin Python and Stefaan Tavernier and {Van Doninck}, Walter and {Van Mulders}, Petra",

note = "Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-003 (CMS Public Pages)",

year = "2021",

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doi = "10.1103/physrevlett.127.102002",

language = "English",

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Collaboration, CMS, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, JT, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W & Van Mulders, P 2021, 'Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV', Phys. Rev. Lett., vol. 127, no. 10, 102002. https://doi.org/10.1103/physrevlett.127.102002

TY - JOUR

T1 - Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

AU - Collaboration, CMS

AU - Blekman, Freya

AU - Bols, Emil Sørensen

AU - Chhibra, Simranjit Singh

AU - D'Hondt, Jorgen

AU - De Clercq, Jarne Theo

AU - Lontkovskyi, Denys

AU - Lowette, Steven

AU - Marchesini, Ivan

AU - Moortgat, Seth

AU - Morton, Alexander

AU - Python, Quentin

AU - Tavernier, Stefaan

AU - Van Doninck, Walter

AU - Van Mulders, Petra

N1 - Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-003 (CMS Public Pages)

PY - 2021/8/31

Y1 - 2021/8/31

N2 - The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.

AB - The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.

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KW - nucl-ex

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U2 - 10.1103/physrevlett.127.102002

DO - 10.1103/physrevlett.127.102002

M3 - Article

SN - 0031-9007

VL - 127

JO - Phys. Rev. Lett.

JF - Phys. Rev. Lett.

IS - 10

M1 - 102002

ER -

Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

Abstract

Bibliographical note

Keywords

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SRP8: Strategic Research Programme: High-Energy Physics at the VUB

High precision measurements of Z boson production in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

Cite this

Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

Abstract

Bibliographical note

Keywords

Access to Document

Handle.net

Other files and links

Fingerprint

Projects

SRP8: Strategic Research Programme: High-Energy Physics at the VUB

Datasets

High precision measurements of Z boson production in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

Cite this