Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays

The LHCb Collaboration; W. Barter; F. Betti; A. Bohare; E. Buchanan; P. E. L. Clarke; R. Currie; S. Eisenhardt; K. Farmer; S. Gambetta; M. Kane; Y. Liu; F. Muheim; M. Needham; F. Oliva; R.H. O'Neil; O. Ozcelik; M. Richardson-Slipper; G. Sarpis; L. Soares Lavra; B. Urbach; C. Vrahas; M. R. J. Williams

doi:10.1016/j.scib.2025.02.025

Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays

The LHCb Collaboration, W. Barter, F. Betti, A. Bohare, E. Buchanan, P. E. L. Clarke, R. Currie, S. Eisenhardt, K. Farmer, S. Gambetta, M. Kane, Y. Liu, F. Muheim, M. Needham, F. Oliva, R.H. O'Neil, O. Ozcelik, M. Richardson-Slipper, G. Sarpis, L. Soares LavraB. Urbach, C. Vrahas, M. R. J. Williams

School of Physics and Astronomy

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

Abstract

A study of Λb0 and Ξb0 decays to Λh+h′- (h(′)=π,K) is performed using pp collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of 9 fb-1. The branching fractions for these decays are measured using the Λb0→Λc+(→Λπ+)π- decay as a control channel. The decays Λb0→Λπ+π- and Ξb0→ΛK-π+ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Λb0→ΛK+K- decay, interpreted as originating primarily from an asymmetric Λb0→N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.

Original language	English
Pages (from-to)	1432-1444
Number of pages	13
Journal	Science Bulletin
Volume	70
Issue number	9
Early online date	25 Feb 2025
DOIs	https://doi.org/10.1016/j.scib.2025.02.025
Publication status	Published - 15 May 2025

Keywords / Materials (for Non-textual outputs)

LHCb experiment
Spectroscopy
Amplitude analysis
Low-energy QCD
B physics
Charm physics

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10.1016/j.scib.2025.02.025Licence: Creative Commons: Attribution (CC-BY)

3 Active
4 Finished

Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
UKRI (formerly RCUK)
1/07/22 → 30/06/27
Project: Research

Cite this

The LHCb Collaboration, Barter, W., Betti, F., Bohare, A., Buchanan, E., Clarke, P. E. L., Currie, R., Eisenhardt, S., Farmer, K., Gambetta, S., Kane, M., Liu, Y., Muheim, F., Needham, M., Oliva, F., O'Neil, R. H., Ozcelik, O., Richardson-Slipper, M., Sarpis, G., ... Williams, M. R. J. (2025). Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays. Science Bulletin, 70(9), 1432-1444. https://doi.org/10.1016/j.scib.2025.02.025

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title = "Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays",

abstract = "A study of Λb0 and Ξb0 decays to Λh+h′- (h(′)=π,K) is performed using pp collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of 9 fb-1. The branching fractions for these decays are measured using the Λb0→Λc+(→Λπ+)π- decay as a control channel. The decays Λb0→Λπ+π- and Ξb0→ΛK-π+ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Λb0→ΛK+K- decay, interpreted as originating primarily from an asymmetric Λb0→N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.",

keywords = "LHCb experiment, Spectroscopy, Amplitude analysis, Low-energy QCD, B physics, Charm physics",

author = "\{The LHCb Collaboration\} and W. Barter and F. Betti and A. Bohare and E. Buchanan and Clarke, \{P. E. L.\} and R. Currie and S. Eisenhardt and K. Farmer and S. Gambetta and M. Kane and Y. Liu and F. Muheim and M. Needham and F. Oliva and R.H. O'Neil and O. Ozcelik and M. Richardson-Slipper and G. Sarpis and Lavra, \{L. Soares\} and B. Urbach and C. Vrahas and Williams, \{M. R. J.\}",

year = "2025",

month = may,

day = "15",

doi = "10.1016/j.scib.2025.02.025",

language = "English",

volume = "70",

pages = "1432--1444",

journal = "Science Bulletin",

issn = "2095-9273",

publisher = "Elsevier",

number = "9",

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The LHCb Collaboration, Barter, W , Betti, F, Bohare, A, Buchanan, E , Clarke, PEL , Currie, R , Eisenhardt, S, Farmer, K, Gambetta, S , Kane, M, Liu, Y, Muheim, F , Needham, M , Oliva, F, O'Neil, RH, Ozcelik, O, Richardson-Slipper, M, Sarpis, G, Lavra, LS, Urbach, B, Vrahas, C & Williams, MRJ 2025, 'Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays', Science Bulletin, vol. 70, no. 9, pp. 1432-1444. https://doi.org/10.1016/j.scib.2025.02.025

TY - JOUR

T1 - Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays

AU - The LHCb Collaboration

AU - Barter, W.

AU - Betti, F.

AU - Bohare, A.

AU - Buchanan, E.

AU - Clarke, P. E. L.

AU - Currie, R.

AU - Eisenhardt, S.

AU - Farmer, K.

AU - Gambetta, S.

AU - Kane, M.

AU - Liu, Y.

AU - Muheim, F.

AU - Needham, M.

AU - Oliva, F.

AU - O'Neil, R.H.

AU - Ozcelik, O.

AU - Richardson-Slipper, M.

AU - Sarpis, G.

AU - Lavra, L. Soares

AU - Urbach, B.

AU - Vrahas, C.

AU - Williams, M. R. J.

PY - 2025/5/15

Y1 - 2025/5/15

N2 - A study of Λb0 and Ξb0 decays to Λh+h′- (h(′)=π,K) is performed using pp collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of 9 fb-1. The branching fractions for these decays are measured using the Λb0→Λc+(→Λπ+)π- decay as a control channel. The decays Λb0→Λπ+π- and Ξb0→ΛK-π+ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Λb0→ΛK+K- decay, interpreted as originating primarily from an asymmetric Λb0→N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.

AB - A study of Λb0 and Ξb0 decays to Λh+h′- (h(′)=π,K) is performed using pp collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of 9 fb-1. The branching fractions for these decays are measured using the Λb0→Λc+(→Λπ+)π- decay as a control channel. The decays Λb0→Λπ+π- and Ξb0→ΛK-π+ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Λb0→ΛK+K- decay, interpreted as originating primarily from an asymmetric Λb0→N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.

KW - LHCb experiment

KW - Spectroscopy

KW - Amplitude analysis

KW - Low-energy QCD

KW - B physics

KW - Charm physics

U2 - 10.1016/j.scib.2025.02.025

DO - 10.1016/j.scib.2025.02.025

M3 - Article

SN - 2095-9273

VL - 70

SP - 1432

EP - 1444

JO - Science Bulletin

JF - Science Bulletin

IS - 9

ER -

Study of Ds1(2460)+ → Ds+ π+π- in B → (D)over-bar(*)Ds+π+π- decays

Abstract

Keywords / Materials (for Non-textual outputs)

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Projects

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons

Cite this