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Title: Observation of τ Lepton Pair Production in Ultraperipheral Pb-Pb Collisions at sqrt[s_{NN}] = 5.02  TeV
Authors: Tumasyan, A
Adam, W
Andrejkovic, JW
Bergauer, T
Chatterjee, S
Damanakis, K
Dragicevic, M
Escalante Del Valle, A
Hussain, PS
Jeitler, M
Krammer, N
Mestdach, G
Niedziela, M
Rendón, C
Roskas, C
Samalan, A
Skovpen, K
Tytgat, M
Van Den Bossche, N
Vermassen, B
Wezenbeek, L
Benecke, A
Bruno, G
Bury, F
Caputo, C
David, P
Delaere, C
Donertas, IS
Giammanco, A
Jaffel, K
Jain, S
Lemaitre, V
Mondal, K
Prisciandaro, J
Taliercio, A
Tran, TT
Vischia, P
Wertz, S
Alves, GA
Coelho, E
Hensel, C
Moraes, A
Rebello Teles, P
Aldá Júnior, WL
Alves Gallo Pereira, M
Reid, ID
Barroso Ferreira Filho, M
Brandao Malbouisson, H
Carvalho, W
Kyberd, P
Chinellato, J
Da Costa, EM
Khan, A
Da Silveira, GG
Cole, JE
Coldham, K
Lechner, L
Liko, D
Mikulec, I
Paulitsch, P
Pitters, FM
Schieck, J
Schöfbeck, R
Schwarz, D
Templ, S
Waltenberger, W
Wulz, CE
Darwish, MR
Janssen, T
Kello, T
Rejeb Sfar, H
Van Mechelen, P
Bols, ES
D'Hondt, J
De Moor, A
Delcourt, M
El Faham, H
Lowette, S
Moortgat, S
Morton, A
Müller, D
Sahasransu, AR
Tavernier, S
Van Doninck, W
Vannerom, D
Clerbaux, B
De Lentdecker, G
Favart, L
Hohov, D
Jaramillo, J
Lee, K
Mahdavikhorrami, M
Makarenko, I
Malara, A
Paredes, S
Pétré, L
Postiau, N
Starling, E
Thomas, L
Vanden Bemden, M
Vander Velde, C
Vanlaer, P
Dobur, D
Knolle, J
Lambrecht, L
Keywords: relativistic heavy-ion collisions;tau leptons;magnetic moment;hadron colliders;particles and fields;nuclear physics
Issue Date: 12-Oct-2023
Publisher: American Physical Society
Citation: Tumasyan, A. et al. for the CMS Collaboration. (2023) 'Observation of τ Lepton Pair Production in Ultraperipheral Pb-Pb Collisions at sqrt[s_{NN}] = 5.02  TeV', Physical review letters, 131 (15), 151803, pp. 1 - 18. doi: 10.1103/PhysRevLett.131.151803.
Abstract: We present an observation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is based on a data sample with an integrated luminosity of 404  μb^{-1} collected by the CMS experiment at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02  TeV. The γγ→τ^{+}τ^{-} process is observed for τ^{+}τ^{-} events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ(γγ→τ^{+}τ^{-})=4.8±0.6(stat)±0.5(syst)  μb, where the second (third) term corresponds to the statistical (systematic) uncertainty in σ(γγ→τ^{+}τ^{-}) in agreement with leading-order QED predictions. Using σ(γγ→τ^{+}τ^{-}), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of a_{τ}=0.001_{-0.089}^{+0.055}.
Description: A preprint of this paper is available at arXiv:2206.05192 [nucl-ex], It has not been certified by peer review.
ISSN: 0031-9007
Other Identifiers: ORCiD: A. Tumasyan
ORCiD: Joanne E Cole
ORCiD: Akram Khan
ORCiD: Paul Kyberd
ORCiD: Ivan D Reid
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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