Soft-Dielectron Excess in Proton-Proton Collisions at √s=13  TeV

Acharya, S.; ...; Antičić, Tome; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, Marko; ...; Karatović, David; ...; Lončar, Petra; ...; Mudnić, Eugen; ...; Planinić, Mirko; ...; Poljak, Nikola; ...; Vicković, Linda; ...; Zurlo, N.

doi:10.1103/PhysRevLett.127.042302

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Scientific paper - Letter

Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV

Physical Review Letters, 127 (2021), 4; 042302. https://doi.org/10.1103/PhysRevLett.127.042302

(ALICE Collaboration) Acharya, S.; ...; Antičić, Tome; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, Marko; ...; Karatović, David; ...; Lončar, Petra; ...; Mudnić, Eugen; ...; Planinić, Mirko; ...; Poljak, Nikola; ...; Vicković, Linda; ...; Zurlo, N. More authors...

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APA 6th Edition

Acharya, S., Antičić, T., Erhardt, F., Gotovac, S., Jerčić, M., Karatović, D. ... Zurlo, N. (2021). Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV. Physical Review Letters, 127. (4). doi: 10.1103/PhysRevLett.127.042302

MLA 8th Edition

Acharya, S., et al. "Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV." Physical Review Letters, vol. 127, no. 4, 2021. https://doi.org/10.1103/PhysRevLett.127.042302

Chicago 17th Edition

Acharya, S., Tome Antičić, Filip Erhardt, Sven Gotovac, Marko Jerčić, David Karatović, Petra Lončar, et al. "Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV." Physical Review Letters 127, no. 4 (2021). https://doi.org/10.1103/PhysRevLett.127.042302

Harvard

Acharya, S., et al. (2021) 'Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV', Physical Review Letters, 127(4). doi: 10.1103/PhysRevLett.127.042302

Vancouver

Acharya S, Antičić T, Erhardt F, Gotovac S, Jerčić M, Karatović D, and sur.. Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV. Physical Review Letters [Internet]. 2021 [cited 2024 November 16];127(4). doi: 10.1103/PhysRevLett.127.042302

IEEE

S. Acharya, et al., "Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV", Physical Review Letters, vol. 127, no. 4, 2021. [Online]. Available at: https://urn.nsk.hr/urn:nbn:hr:217:547952. [Accessed: 16 November 2024]

Cite this item: https://urn.nsk.hr/urn:nbn:hr:217:547952

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Metadata

Title (english)	Soft-Dielectron Excess in Proton-Proton Collisions at √s=13 TeV
Author	S. Acharya
Author	...
Author	Tome Antičić
Author	...
Author	Filip Erhardt
Author	...
Author	Sven Gotovac
Author	...
Author	Marko Jerčić
Author	...
Author	David Karatović
Author	...
Author	Petra Lončar
Author	...
Author	Eugen Mudnić
Author	...
Author	Mirko Planinić
Author	...
Author	Nikola Poljak
Author	...
Author	Linda Vicković
Author	...
Author	N. Zurlo
Collaboration	ALICE Collaboration
Author's institution	University of Zagreb Faculty of Science (Department of Physics)
Scientific / art field, discipline and subdiscipline	NATURAL SCIENCES Physics
Abstract (english)	A measurement of dielectron production in proton- proton (pp) collisions at √s=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron invariant mass mee and pair transverse momentum pT, ee that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of mee, pT, ee, and event multiplicity dNch/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π0 ratio in pp and proton-nucleus (p-A) collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15<mee<0.6 GeV/c^2 and for pT, ee<0.4 GeV/c indicates an enhancement of soft dielectrons, reminiscent of the 'anomalous' soft-photon and -dilepton excess in hadron-hadron collisions reported by several experiments under different experimental conditions. The enhancement factor over the hadronic cocktail amounts to 1.61±0.13(stat.)±0.17(syst., data) ±0.34(syst., cocktail) in the ALICE acceptance. Acceptance-corrected excess spectra in mee and pT, ee are extracted and compared with calculations of dielectron production from hadronic bremsstrahlung and thermal radiation within a hadronic many-body approach.
Keywords (english)
Language	english
Publication type	Scientific paper - Letter
Publication status	Published
Peer review	Peer review - international
Publication version	Published version
Journal title	Physical Review Letters
Numbering	vol. 127, no. 4, 042302
p-ISSN	0031-9007
e-ISSN	1079-7114
DOI	https://doi.org/10.1103/PhysRevLett.127.042302
URN:NBN	urn:nbn:hr:217:547952
Publication	2021
Document URL	https://link.aps.org/doi/10.1103/PhysRevLett.127.042302
Type of resource	Text
Access conditions	Open access
Terms of use
Public note	Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 15 June 2020; revised 12 April 2021; accepted 8 June 2021; published 23 July 2021.
Created on	2024-09-16 12:25:26