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Measurements of the Branching Fractions of the Semileptonic Decays Ξ$_{c}$$^{0}$ → Ξ$^{-}$ℓ$^{+}$ν$_{ℓ}$ and the Asymmetry Parameter of Ξ$_{c}$$^{0}$ → Ξ$^{-}$π$^{+}$

Belle Collaboration; Li, Y. B.; Shen, C. P.; Adachi, I.; Adamczyk, K.; Aihara, H.; Al Said, S.; Asner, D. M.; Aushev, T.; Ayad, R.; Babu, V.; Behera, P.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bilka, T.; Biswal, J.; Bonvicini, G.; ... mehr

Abstract:

Using data samples of 89.5 and 711fb$^{-1}$ recorded at energies of
$\sqrt{s}$=10.52 and 10.58 GeV, respectively, with the Belle detector at the KEKB e$^{+}$e$^{-}$ collider, we report measurements of branching fractions of semileptonic decays Ξ$_{c}$$^{0}$ → Ξ$^{-}$ℓ$^{+}$ν$_{ℓ}$(ℓ=e or μ) and the CP-asymmetry parameter of Ξ$_{c}$$^{0}$ → Ξ$^{-}$π$^{+}$ decay. The branching fractions are measured to be B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$e$^{+}$ν$_{e}$)=
1.31±0.04±0.07±0.38)% and B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$μ$^{+}$ν$_{μ}$ = (1.27±0.06±0.10±0.37)% , and the decay parameter α$_{Ξπ}$ is measured to be 0.63±0.03±0.01 with much improved precision compared with the current world average. The corresponding ratio B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$e$^{+}$ν$_{e}$) /B(Ξ$_{c}$$^{0}$ → Ξ$^{-}$μ$^{+}$ν$_{μ}$) is 1.03±0.05±0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter A$_{CP}$=(α$_{Ξ^{-}π^{+}}$+α$_{Ξ^{+}π^{-}}$)/(α$_{Ξ^{-}π^{+}}$+α$_{Ξ^{+}π^{-}}$) = 0.024±0.052±0.014 is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the Ξ$_{c}$$^{0}$ → Ξ$^{-}$π$^{+}$ branching fraction.


Verlagsausgabe §
DOI: 10.5445/IR/1000138926
Veröffentlicht am 13.10.2021
Originalveröffentlichung
DOI: 10.1103/PhysRevLett.127.121803
Scopus
Zitationen: 34
Web of Science
Zitationen: 24
Dimensions
Zitationen: 29
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000138926
Erschienen in Physical Review Letters
Verlag American Physical Society (APS)
Band 127
Heft 12
Seiten Art.-Nr.: 121803
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in arXiv
Scopus
Dimensions
Web of Science
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