Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions

R. Aaij; A. S.W. Abdelmotteleb; C. Abellan Beteta; F. Abudinén; T. Ackernley; A. A. Adefisoye; B. Adeva; M. Adinolfi; P. Adlarson; C. Agapopoulou; C. A. Aidala; Z. Ajaltouni; S. Akar; K. Akiba; P. Albicocco; J. Albrecht; F. Alessio; Z. Aliouche; P. Alvarez Cartelle; R. Amalric; S. Amato; J. L. Amey; Y. Amhis; L. An; L. Anderlini; M. Andersson; A. Andreianov; P. Andreola; M. Andreotti; D. Andreou; A. Anelli; D. Ao; F. Archilli; M. Argenton; S. Arguedas Cuendis; A. Artamonov; M. Artuso; E. Aslanides; R. Ataíde Da Silva; M. Atzeni; B. Audurier; D. Bacher; I. Bachiller Perea; S. Bachmann; M. Bachmayer; J. J. Back; P. Baladron Rodriguez; V. Balagura; A. Balboni; W. Baldini; LHCb collaboration; Daniel Hugo Cámpora Pérez

doi:10.1007/JHEP07(2025)121

Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions

R. Aaij^*
, A. S.W. Abdelmotteleb
, C. Abellan Beteta
, F. Abudinén
, T. Ackernley
, A. A. Adefisoye
, B. Adeva
, M. Adinolfi
, P. Adlarson
, C. Agapopoulou
, C. A. Aidala
, Z. Ajaltouni
, S. Akar
, K. Akiba
, P. Albicocco
, J. Albrecht
, F. Alessio
, Z. Aliouche
, P. Alvarez Cartelle
, R. Amalric

S. Amato, J. L. Amey, Y. Amhis, L. An, L. Anderlini, M. Andersson, A. Andreianov, P. Andreola, M. Andreotti, D. Andreou, A. Anelli, D. Ao, F. Archilli, M. Argenton, S. Arguedas Cuendis, A. Artamonov, M. Artuso, E. Aslanides, R. Ataíde Da Silva, M. Atzeni, B. Audurier, D. Bacher, I. Bachiller Perea, S. Bachmann, M. Bachmayer, J. J. Back, P. Baladron Rodriguez, V. Balagura, A. Balboni, W. Baldini, LHCb collaboration, Daniel Hugo Cámpora Pérez

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

A study of the charmless baryonic decays Bs0?K0pp¯ is presented, where Bs0 denotes either a B0 or a Bs0 meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The decay Bs0?K0pp¯ is observed for the first time, with a measured branching fraction of (9.14 ± 1.69 ± 0.90 ± 0.33 ± 0.20) × 10-7 and a significance of 5.6s. The uncertainties respectively account for statistical and systematic contributions, the precision of the branching fraction of the normalisation channel B0? K0p+p- and the fragmentation fraction ratio f<inf>s</inf>/f<inf>d</inf>. The branching fraction determined for B0?K0pp¯ is (2.82 ± 0.08 ± 0.12 ± 0.10) × 10-6, which is the most precise measurement to date.

Original language	English
Article number	121
Number of pages	25
Journal	Journal of High Energy Physics
Volume	2025
Issue number	7
DOIs	https://doi.org/10.1007/JHEP07(2025)121
Publication status	Published - 9 Jul 2025

Keywords

B Physics
Branching fraction
Flavour Physics
Hadron-Hadron Scattering

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10.1007/JHEP07(2025)121Licence: CC BY

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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., Aliouche, Z., Alvarez Cartelle, P., ... Cámpora Pérez, D. H. (2025). Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions. Journal of High Energy Physics, 2025(7), Article 121. https://doi.org/10.1007/JHEP07(2025)121

@article{eb97764eb17b4750884ea456570dfd32,

title = "Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions",

abstract = "A study of the charmless baryonic decays Bs0?K0pp¯ is presented, where Bs0 denotes either a B0 or a Bs0 meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The decay Bs0?K0pp¯ is observed for the first time, with a measured branching fraction of (9.14 ± 1.69 ± 0.90 ± 0.33 ± 0.20) × 10-7 and a significance of 5.6s. The uncertainties respectively account for statistical and systematic contributions, the precision of the branching fraction of the normalisation channel B0? K0p+p- and the fragmentation fraction ratio fs/fd. The branching fraction determined for B0?K0pp¯ is (2.82 ± 0.08 ± 0.12 ± 0.10) × 10-6, which is the most precise measurement to date.",

keywords = "B Physics, Branching fraction, Flavour Physics, Hadron-Hadron Scattering",

author = "R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and F. Alessio and Z. Aliouche and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli and M. Argenton and \{Arguedas Cuendis\}, S. and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and A. Balboni and W. Baldini and \{LHCb collaboration\} and \{C{\'a}mpora P{\'e}rez\}, \{Daniel Hugo\}",

note = "Funding Information: We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: ARC (Australia); CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICIU and AEI (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (U.S.A.). We acknowledge the computing resources that are provided by ARDC (Australia), CBPF (Brazil), CERN, IHEP and LZU (China), IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), Polish WLCG (Poland), IFIN-HH (Romania), PIC (Spain), CSCS (Switzerland), and GridPP (United Kingdom). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. \& Tech. Program of Guangzhou (China); Minciencias (Colombia); EPLANET, Marie Sk\textbackslash{}u0142odowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R\textbackslash{}u00E9gion Auvergne-Rh\textbackslash{}u00F4ne-Alpes (France); Alexander-von-Humboldt Foundation (Germany); ICSC (Italy); Severo Ochoa and Mar\textbackslash{}u00EDa de Maeztu Units of Excellence, GVA, XuntaGal, GENCAT, InTalent-Inditex and Prog. Atracci\textbackslash{}u00F3n Talento CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). Publisher Copyright: {\textcopyright} The Author(s) 2025.",

year = "2025",

month = jul,

day = "9",

doi = "10.1007/JHEP07(2025)121",

language = "English",

volume = "2025",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer Verlag",

number = "7",

}

Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C, Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Alessio, F, Aliouche, Z, Alvarez Cartelle, P, Amalric, R, Amato, S, Amey, JL, 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, JJ, Baladron Rodriguez, P, Balagura, V, Balboni, A, Baldini, W, LHCb collaboration & Cámpora Pérez, DH 2025, 'Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions', Journal of High Energy Physics, vol. 2025, no. 7, 121. https://doi.org/10.1007/JHEP07(2025)121

TY - JOUR

T1 - Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Aliouche, Z.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreianov, A.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andreou, D.

AU - Anelli, A.

AU - Ao, D.

AU - Archilli, F.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Balboni, A.

AU - Baldini, W.

AU - LHCb collaboration

AU - Cámpora Pérez, Daniel Hugo

N1 - Funding Information: We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: ARC (Australia); CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICIU and AEI (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (U.S.A.). We acknowledge the computing resources that are provided by ARDC (Australia), CBPF (Brazil), CERN, IHEP and LZU (China), IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), Polish WLCG (Poland), IFIN-HH (Romania), PIC (Spain), CSCS (Switzerland), and GridPP (United Kingdom). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); Minciencias (Colombia); EPLANET, Marie Sk\u0142odowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R\u00E9gion Auvergne-Rh\u00F4ne-Alpes (France); Alexander-von-Humboldt Foundation (Germany); ICSC (Italy); Severo Ochoa and Mar\u00EDa de Maeztu Units of Excellence, GVA, XuntaGal, GENCAT, InTalent-Inditex and Prog. Atracci\u00F3n Talento CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom). Publisher Copyright: © The Author(s) 2025.

PY - 2025/7/9

Y1 - 2025/7/9

N2 - A study of the charmless baryonic decays Bs0?K0pp¯ is presented, where Bs0 denotes either a B0 or a Bs0 meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The decay Bs0?K0pp¯ is observed for the first time, with a measured branching fraction of (9.14 ± 1.69 ± 0.90 ± 0.33 ± 0.20) × 10-7 and a significance of 5.6s. The uncertainties respectively account for statistical and systematic contributions, the precision of the branching fraction of the normalisation channel B0? K0p+p- and the fragmentation fraction ratio fs/fd. The branching fraction determined for B0?K0pp¯ is (2.82 ± 0.08 ± 0.12 ± 0.10) × 10-6, which is the most precise measurement to date.

AB - A study of the charmless baryonic decays Bs0?K0pp¯ is presented, where Bs0 denotes either a B0 or a Bs0 meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb-1. The decay Bs0?K0pp¯ is observed for the first time, with a measured branching fraction of (9.14 ± 1.69 ± 0.90 ± 0.33 ± 0.20) × 10-7 and a significance of 5.6s. The uncertainties respectively account for statistical and systematic contributions, the precision of the branching fraction of the normalisation channel B0? K0p+p- and the fragmentation fraction ratio fs/fd. The branching fraction determined for B0?K0pp¯ is (2.82 ± 0.08 ± 0.12 ± 0.10) × 10-6, which is the most precise measurement to date.

KW - B Physics

KW - Branching fraction

KW - Flavour Physics

KW - Hadron-Hadron Scattering

U2 - 10.1007/JHEP07(2025)121

DO - 10.1007/JHEP07(2025)121

M3 - Article

SN - 1029-8479

VL - 2025

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 7

M1 - 121

ER -

Observation of the decay Bs0?K0pp¯ and measurement of the Bs0?K0pp¯ branching fractions

Abstract

Keywords

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