Measurement of CP asymmetries in Λb0→ph- 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; O. Ozcelik; M. Richardson-Slipper; G. Sarpis; L. Soares Lavra; B. Urbach; C. Vrahas; M. R. J. Williams

doi:10.1103/PhysRevD.111.092004

Measurement of CP asymmetries in Λb0→ph- 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, O. Ozcelik, M. Richardson-Slipper, G. Sarpis, L. Soares Lavra, B. UrbachC. Vrahas, M. R. J. Williams

School of Physics and Astronomy

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

Abstract

A search for CP violation in Λb0→pK- and Λb0→pπ- decays is presented using the full Run 1 and Run 2 data samples of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb-1 at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the CP-violating asymmetries are measured to be ACPpK-=(-1.4±0.7±0.4)% and ACPpπ-=(0.4±0.9±0.4)%, where the first uncertainty is statistical and the second is systematic. Following significant improvements in the evaluation of systematic uncertainties compared to the previous LHCb measurement, the Run 1 dataset is reanalyzed to update the corresponding results. When combining the Run 2 and updated Run 1 measurements, the final results are found to be ACPpK-=(-1.1±0.7±0.4)% and ACPpπ-=(0.2±0.8±0.4)%, constituting the most precise measurements of these asymmetries to date.

Original language	English
Article number	092004
Pages (from-to)	1-15
Number of pages	15
Journal	Physical Review D
Volume	111
Issue number	9
Early online date	1 May 2025
DOIs	https://doi.org/10.1103/PhysRevD.111.092004
Publication status	Published - 8 May 2025

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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., Ozcelik, O., Richardson-Slipper, M., Sarpis, G., Lavra, L. S., ... Williams, M. R. J. (2025). Measurement of CP asymmetries in Λb0→ph- decays. Physical Review D, 111(9), 1-15. Article 092004. https://doi.org/10.1103/PhysRevD.111.092004

@article{3ebad945d8434a3ba3535d2c92916596,

title = "Measurement of CP asymmetries in Λb0→ph- decays",

abstract = "A search for CP violation in Λb0→pK- and Λb0→pπ- decays is presented using the full Run 1 and Run 2 data samples of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb-1 at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the CP-violating asymmetries are measured to be ACPpK-=(-1.4±0.7±0.4)\% and ACPpπ-=(0.4±0.9±0.4)\%, where the first uncertainty is statistical and the second is systematic. Following significant improvements in the evaluation of systematic uncertainties compared to the previous LHCb measurement, the Run 1 dataset is reanalyzed to update the corresponding results. When combining the Run 2 and updated Run 1 measurements, the final results are found to be ACPpK-=(-1.1±0.7±0.4)\% and ACPpπ-=(0.2±0.8±0.4)\%, constituting the most precise measurements of these asymmetries to date.",

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 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 = "8",

doi = "10.1103/PhysRevD.111.092004",

language = "English",

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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, Ozcelik, O, Richardson-Slipper, M, Sarpis, G, Lavra, LS, Urbach, B, Vrahas, C & Williams, MRJ 2025, 'Measurement of CP asymmetries in Λb0→ph- decays', Physical Review D, vol. 111, no. 9, 092004, pp. 1-15. https://doi.org/10.1103/PhysRevD.111.092004

TY - JOUR

T1 - Measurement of CP asymmetries in Λb0→ph- 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 - 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 - 2025/5/8

Y1 - 2025/5/8

N2 - A search for CP violation in Λb0→pK- and Λb0→pπ- decays is presented using the full Run 1 and Run 2 data samples of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb-1 at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the CP-violating asymmetries are measured to be ACPpK-=(-1.4±0.7±0.4)% and ACPpπ-=(0.4±0.9±0.4)%, where the first uncertainty is statistical and the second is systematic. Following significant improvements in the evaluation of systematic uncertainties compared to the previous LHCb measurement, the Run 1 dataset is reanalyzed to update the corresponding results. When combining the Run 2 and updated Run 1 measurements, the final results are found to be ACPpK-=(-1.1±0.7±0.4)% and ACPpπ-=(0.2±0.8±0.4)%, constituting the most precise measurements of these asymmetries to date.

AB - A search for CP violation in Λb0→pK- and Λb0→pπ- decays is presented using the full Run 1 and Run 2 data samples of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb-1 at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the CP-violating asymmetries are measured to be ACPpK-=(-1.4±0.7±0.4)% and ACPpπ-=(0.4±0.9±0.4)%, where the first uncertainty is statistical and the second is systematic. Following significant improvements in the evaluation of systematic uncertainties compared to the previous LHCb measurement, the Run 1 dataset is reanalyzed to update the corresponding results. When combining the Run 2 and updated Run 1 measurements, the final results are found to be ACPpK-=(-1.1±0.7±0.4)% and ACPpπ-=(0.2±0.8±0.4)%, constituting the most precise measurements of these asymmetries to date.

U2 - 10.1103/PhysRevD.111.092004

DO - 10.1103/PhysRevD.111.092004

M3 - Article

SN - 2470-0010

VL - 111

SP - 1

EP - 15

JO - Physical Review D

JF - Physical Review D

IS - 9

M1 - 092004

ER -

Measurement of CP asymmetries in Λb0→ph- decays

Abstract

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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