Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter
(2023) In Physical Review C 107(2).- Abstract
We present a Bayesian method to reconstruct event-by-event multiplicity fluctuations and rapidity correlations in p+Pb collisions at zero impact parameter from minimum-bias data, without assuming any model of the collision dynamics. We test it on Monte Carlo simulations with the Angantyr model, then apply it to ATLAS data on the distribution of charged multiplicity and transverse energy in p+Pb collisions at sNN=5.02 TeV. Fluctuations in b=0 collisions are quantum fluctuations which originate mostly from the proton wave function, and therefore have the potential to constrain the subnucleonic structure of the proton. The Angantyr model is found to overestimate fluctuations. In addition, we find that as the rapidity increases (towards the... (More)
We present a Bayesian method to reconstruct event-by-event multiplicity fluctuations and rapidity correlations in p+Pb collisions at zero impact parameter from minimum-bias data, without assuming any model of the collision dynamics. We test it on Monte Carlo simulations with the Angantyr model, then apply it to ATLAS data on the distribution of charged multiplicity and transverse energy in p+Pb collisions at sNN=5.02 TeV. Fluctuations in b=0 collisions are quantum fluctuations which originate mostly from the proton wave function, and therefore have the potential to constrain the subnucleonic structure of the proton. The Angantyr model is found to overestimate fluctuations. In addition, we find that as the rapidity increases (towards the Pb-going side), not only the multiplicity density increases, but also its relative event-by-event fluctuation. This counterintuitive phenomenon is also observed in simulations with Angantyr, and with the quantum chromodynamics dipole model, where its origin can be traced back to the branching process through which gluons are produced.
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- author
- Pepin, Mathis ; Christiansen, Peter LU ; Munier, Stéphane and Ollitrault, Jean Yves
- organization
- publishing date
- 2023-02
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review C
- volume
- 107
- issue
- 2
- article number
- 024902
- publisher
- American Physical Society
- external identifiers
-
- scopus:85149632992
- ISSN
- 2469-9985
- DOI
- 10.1103/PhysRevC.107.024902
- language
- English
- LU publication?
- yes
- id
- 15b73f85-f320-4fd7-81dd-8e0810cbd97d
- date added to LUP
- 2023-06-13 11:19:58
- date last changed
- 2023-06-13 11:19:58
@article{15b73f85-f320-4fd7-81dd-8e0810cbd97d,
abstract = {{<p>We present a Bayesian method to reconstruct event-by-event multiplicity fluctuations and rapidity correlations in p+Pb collisions at zero impact parameter from minimum-bias data, without assuming any model of the collision dynamics. We test it on Monte Carlo simulations with the Angantyr model, then apply it to ATLAS data on the distribution of charged multiplicity and transverse energy in p+Pb collisions at sNN=5.02 TeV. Fluctuations in b=0 collisions are quantum fluctuations which originate mostly from the proton wave function, and therefore have the potential to constrain the subnucleonic structure of the proton. The Angantyr model is found to overestimate fluctuations. In addition, we find that as the rapidity increases (towards the Pb-going side), not only the multiplicity density increases, but also its relative event-by-event fluctuation. This counterintuitive phenomenon is also observed in simulations with Angantyr, and with the quantum chromodynamics dipole model, where its origin can be traced back to the branching process through which gluons are produced.</p>}},
author = {{Pepin, Mathis and Christiansen, Peter and Munier, Stéphane and Ollitrault, Jean Yves}},
issn = {{2469-9985}},
language = {{eng}},
number = {{2}},
publisher = {{American Physical Society}},
series = {{Physical Review C}},
title = {{Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter}},
url = {{http://dx.doi.org/10.1103/PhysRevC.107.024902}},
doi = {{10.1103/PhysRevC.107.024902}},
volume = {{107}},
year = {{2023}},
}