Search for resonance-enhanced C P and angular asymmetries in the Λ c + → p μ + μ − decay at LHCb

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoulou, C.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Akiba, K.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Aliouche, Z.; Alvarez Cartelle, P.; Amalric, R.; Amato, S.; Amey, J. L.; Amhis, Y.; An, L.; Anderlini, L.; Andersson, M.; Andreianov, A.; Andreola, P.; Andreotti, M.; Andreou, D.; Anelli, A.; Ao, D.; Archilli, F.; Argenton, M.; Arguedas Cuendis, S.; Artamonov, A.; Artuso, M.; Aslanides, E.; Ataíde Da Silva, R.; Atzeni, M.; Audurier, B.; Bacher, D.; Bachiller Perea, I.; Bachmann, S.; Bachmayer, M.; Back, J. J.; Baladron Rodriguez, P.; Balagura, V.; Balboni, A.; Baldini, W.; Balzani, L.; Bao, H.; Baptista de Souza Leite, J.; Barbero Pretel, C.; Barbetti, M.; Barbosa, I. R.; Barlow, R. J.; Barnyakov, M.; Barsuk, S.; Barter, W.; Bartz, J.; Basels, J. M.; Bashir, S.; Bassi, G.; Batsukh, B.; Battista, P. 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A.; Debernardis, F.; Decamp, D.; Dedu, V.; Dekkers, S.; Del Buono, L.; Delaney, B.; Dembinski, H. -P.; Deng, J.; Denysenko, V.; Deschamps, O.; Dettori, F.; Dey, B.; Di Nezza, P.; Diachkov, I.; Didenko, S.; Ding, S.; Dittmann, L.; Dobishuk, V.; Docheva, A. D.; Dong, C.; Donohoe, A. M.; Dordei, F.; dos Reis, A. C.; Dowling, A. D.; Duan, W.; Duda, P.; Dudek, M. W.; Dufour, L.; Duk, V.; Durante, P.; Duras, M. M.; Durham, J. M.; Durmus, O. D.; Dziurda, A.; Dzyuba, A.; Easo, S.; Eckstein, E.; Egede, U.; Egorychev, A.; Egorychev, V.; Eisenhardt, S.; Ejopu, E.; Eklund, L.; Elashri, M.; Ellbracht, J.; Ely, S.; Ene, A.; Eschle, J.; Esen, S.; Evans, T.; Fabiano, F.; Falcao, L. N.; Fan, Y.; Fang, B.; Fantini, L.; Faria, M.; Farmer, K.; Fazzini, D.; Felkowski, L.; Feng, M.; Feo, M.; Fernandez Casani, A.; Fernandez Gomez, M.; Fernez, A. D.; Ferrari, F.; Ferreira Rodrigues, F.; Ferrillo, M.; Ferro-Luzzi, M.; Filippov, S.; Fini, R. A.; Fiorini, M.; Firlej, M.; Fischer, K. L.; Fitzgerald, D. S.; Fitzpatrick, C.; Fiutowski, T.; Fleuret, F.; Fontana, M.; Foreman, L. F.; Forty, R.; Foulds-Holt, D.; Franco Lima, V.; Franco Sevilla, M.; Frank, M.; Franzoso, E.; Frau, G.; Frei, C.; Friday, D. A.; Fu, J.; Führing, Q.; Fujii, Y.; Fulghesu, T.; Gabriel, E.; Galati, G.; Galati, M. D.; Gallas Torreira, A.; Galli, D.; Gambetta, S.; Gandelman, M.; Gandini, P.; Ganie, B.; Gao, H.; Gao, R.; Gao, T. Q.; Gao, Y.; Gao, Y.; Gao, Y.; Garcia Martin, L. M.; Garcia Moreno, P.; García Pardiñas, J.; Gardner, P.; Garg, K. G.; Garrido, L.; Gaspar, C.; Gavrikov, A.; Gerken, L. L.; Gersabeck, E.; Gersabeck, M.; Gershon, T.; Ghizzo, S.; Ghorbanimoghaddam, Z.; Giambastiani, L.; Giasemis, F. I.; Gibson, V.; Giemza, H. K.; Gilman, A. L.; Giovannetti, M.; Gioventù, A.; Girardey, L.; Giugliano, C.; Giza, M. A.; Glaser, F. C.; Gligorov, V. 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doi:10.1103/PhysRevD.111.L091102

Search for resonance-enhanced $C P$ and angular asymmetries in the $Λ_{c}^{+} \to p μ^{+} μ^{-}$ decay at LHCb

Journal Article · Mon May 12 00:00:00 EDT 2025 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.111.L091102· OSTI ID:2565776

; ; ; ; ; ; ; ; ; ; ; Ajaltouni, Z.; ; ; ; ; ; ; ; more »

The first measurement of the $C P$ asymmetry of the decay rate ( $A_{C P}$ ) and the $C P$ average ( $Σ A_{FB}$ ) and $C P$ asymmetry ( $Δ A_{FB}$ ) of the forward-backward asymmetry in the muon system of $Λ_{c}^{+} \to p μ^{+} μ^{-}$ decays is reported. The measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of $5.4 {fb}^{- 1}$ . The asymmetries are measured in two regions of dimuon mass near the $ϕ$ -meson mass peak. The dimuon-mass integrated results are $A_{C P} = (- 1.1 \pm 4.0 \pm 0.5) %$ , $Σ A_{FB} = (3.9 \pm 4.0 \pm 0.6) %$ , $Δ A_{FB} = (3.1 \pm 4.0 \pm 0.4) %$ , where the first uncertainty is statistical and the second systematic. The results are consistent with the conservation of $C P$ symmetry and the Standard Model expectations.

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI ID:: 2565776

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 111; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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