PreprintCC BY 4.0arXiv
Observation of the Ξc0 → pK- decay and measurement of its decay asymmetry
Abstract
A search for the Cabibbo-suppressed decay Ξc0 → pK- is performed using pp collision data corresponding to an integrated luminosity of 5.4 fb−1, collected by the LHCb experiment at a centre-of-mass energy of 13 TeV. The decay is observed for the first time and its branching fraction measured to be (4.5±0.5±0.2±0.9)×10−5, where the uncertainties are statistical, systematic and from the branching fraction of the normalisation channel Ξb- → Ξc0 (→ p K- K- π+) π-. Using the decay chain Ξb- → Ξc0(→ pK-)π-, the decay asymmetry parameter of the Ξc0 → pK- decay is determined to be αΞc0=0.32±0.15±0.01.
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BibTeX
@misc{collaboration2026observation,
title = {{Observation of the $Ξ_c^0 \to pK^-$ decay and measurement of its decay asymmetry}},
author = {LHCb collaboration and R. Aaij and M. Abdelfatah and A. S. W. Abdelmotteleb and C. Abellan Beteta and F. Abudinén and T. Ackernley and A. A. Adefisoye and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and C. A. Aidala and S. Akar and K. Akiba and H. Al Saleh and P. Albicocco and J. Albrecht and R. Aleksiejunas and F. Alessio and P. Alvarez Cartelle and S. Amato and J. L. Amey and Y. Amhis and Z. Amos and L. An and L. Anderlini and P. Andreola and M. Andreotti and S. Andres Estrada and A. Anelli and D. Ao and C. Arata and F. Archilli and Z. Areg and M. Argenton and S. Arguedas Cuendis and L. Arnone and M. Artuso and E. Aslanides and R. Ataíde Da Silva and M. Atzeni and B. Audurier and J. A. Authier and D. Bacher and I. Bachiller Perea and S. Bachmann and M. Bachmayer and J. J. Back and M. Bai and Z. B. Bai and V. Balagura and A. Balboni and W. Baldini and Z. Baldwin and L. Balzani and H. Bao and J. Baptista de Souza Leite and C. Barbero Pretel and M. Barbetti},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.27894},
eprint = {2608.27894},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.27894},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observation of the Ξ_c^0 → pK^- decay and measurement of its decay asymmetry
AU - LHCb collaboration
AU - R. Aaij
AU - M. Abdelfatah
AU - A. S. W. Abdelmotteleb
AU - C. Abellan Beteta
AU - F. Abudinén
AU - T. Ackernley
AU - A. A. Adefisoye
AU - B. Adeva
AU - M. Adinolfi
AU - P. Adlarson
AU - C. Agapopoulou
AU - C. A. Aidala
AU - S. Akar
AU - K. Akiba
AU - H. Al Saleh
AU - P. Albicocco
AU - J. Albrecht
AU - R. Aleksiejunas
AU - F. Alessio
AU - P. Alvarez Cartelle
AU - S. Amato
AU - J. L. Amey
AU - Y. Amhis
AU - Z. Amos
AU - L. An
AU - L. Anderlini
AU - P. Andreola
AU - M. Andreotti
AU - S. Andres Estrada
AU - A. Anelli
AU - D. Ao
AU - C. Arata
AU - F. Archilli
AU - Z. Areg
AU - M. Argenton
AU - S. Arguedas Cuendis
AU - L. Arnone
AU - M. Artuso
AU - E. Aslanides
AU - R. Ataíde Da Silva
AU - M. Atzeni
AU - B. Audurier
AU - J. A. Authier
AU - D. Bacher
AU - I. Bachiller Perea
AU - S. Bachmann
AU - M. Bachmayer
AU - J. J. Back
AU - M. Bai
AU - Z. B. Bai
AU - V. Balagura
AU - A. Balboni
AU - W. Baldini
AU - Z. Baldwin
AU - L. Balzani
AU - H. Bao
AU - J. Baptista de Souza Leite
AU - C. Barbero Pretel
AU - M. Barbetti
PY - 2026
DA - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2608.27894
UR - https://arxiv.org/abs/2608.27894
AB - A search for the Cabibbo-suppressed decay Ξ_c^0 → pK^- is performed using pp collision data corresponding to an integrated luminosity of 5.4 fb^−1, collected by the LHCb experiment at a centre-of-mass energy of 13 TeV. The decay is observed for the first time and its branching fraction measured to be (4.5±0.5±0.2±0.9)×10^−5, where the uncertainties are statistical, systematic and from the branching fraction of the normalisation channel Ξ_b^- → Ξ_c^0 (→ p K^- K^- π^+) π^-. Using the decay chain Ξ_b^- → Ξ_c^0(→ pK^-)π^-, the decay asymmetry parameter of the Ξ_c^0 → pK^- decay is determined to be α_Ξ_c^0=0.32±0.15±0.01.
ER -