Measurement of 𝐶⁢𝑃 Violation in the Decay 𝐵+→𝐾+⁢𝜋0

LHCb collaboration

doi:10.1103/PhysRevLett.126.091802

Measurement of 𝐶⁢𝑃 Violation in the Decay 𝐵+→𝐾+⁢𝜋0

LHCb collaboration

School of Physics and Astronomy

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

Abstract

A measurement of 𝐶⁢𝑃 violation in the decay 𝐵+→𝐾+⁢𝜋0 is reported using data corresponding to an integrated luminosity of 5.4 fb−1 collected with the LHCb experiment at a center-of-mass energy of √𝑠=13 TeV. The 𝐶⁢𝑃 asymmetry is measured to be 0.025±0.015±0.006±0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct 𝐶⁢𝑃 asymmetries of the 𝐵0→𝐾+⁢𝜋− and 𝐵+→𝐾+⁢𝜋0 decays, known as the 𝐾⁢𝜋 puzzle.

Original language	English
Article number	091802
Pages (from-to)	1-11
Number of pages	11
Journal	Physical Review Letters
Volume	126
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.126.091802
Publication status	Published - 2 Mar 2021

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http://arxiv.org/abs/2012.12789

3 Finished
3 Active

Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/04/23 → 30/09/25
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/10/22 → 30/09/25
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
1/07/22 → 30/06/26
Project: Research

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@article{039654e8f02b45d097bf774a0e40b4a8,

title = "Measurement of 𝐶⁢𝑃 Violation in the Decay 𝐵+→𝐾+⁢𝜋0",

abstract = "A measurement of 𝐶⁢𝑃 violation in the decay 𝐵+→𝐾+⁢𝜋0 is reported using data corresponding to an integrated luminosity of 5.4 fb−1 collected with the LHCb experiment at a center-of-mass energy of √𝑠=13 TeV. The 𝐶⁢𝑃 asymmetry is measured to be 0.025±0.015±0.006±0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct 𝐶⁢𝑃 asymmetries of the 𝐵0→𝐾+⁢𝜋− and 𝐵+→𝐾+⁢𝜋0 decays, known as the 𝐾⁢𝜋 puzzle.",

author = "{LHCb collaboration} and William Barter and P.E.L. Clarke and S. Gambetta and F. Muheim and M. Needham and Mark Williams and Federico Betti and Robert Currie and S. Eisenhardt and Lavra, {Lais Soares} and Gediminas Sarpis",

year = "2021",

month = mar,

day = "2",

doi = "10.1103/PhysRevLett.126.091802",

language = "English",

volume = "126",

pages = "1--11",

journal = "Physical Review Letters",

issn = "0031-9007",

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T1 - Measurement of 𝐶⁢𝑃 Violation in the Decay 𝐵+→𝐾+⁢𝜋0

AU - LHCb collaboration

AU - Barter, William

AU - Clarke, P.E.L.

AU - Gambetta, S.

AU - Muheim, F.

AU - Needham, M.

AU - Williams, Mark

AU - Betti, Federico

AU - Currie, Robert

AU - Eisenhardt, S.

AU - Lavra, Lais Soares

AU - Sarpis, Gediminas

PY - 2021/3/2

Y1 - 2021/3/2

N2 - A measurement of 𝐶⁢𝑃 violation in the decay 𝐵+→𝐾+⁢𝜋0 is reported using data corresponding to an integrated luminosity of 5.4 fb−1 collected with the LHCb experiment at a center-of-mass energy of √𝑠=13 TeV. The 𝐶⁢𝑃 asymmetry is measured to be 0.025±0.015±0.006±0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct 𝐶⁢𝑃 asymmetries of the 𝐵0→𝐾+⁢𝜋− and 𝐵+→𝐾+⁢𝜋0 decays, known as the 𝐾⁢𝜋 puzzle.

AB - A measurement of 𝐶⁢𝑃 violation in the decay 𝐵+→𝐾+⁢𝜋0 is reported using data corresponding to an integrated luminosity of 5.4 fb−1 collected with the LHCb experiment at a center-of-mass energy of √𝑠=13 TeV. The 𝐶⁢𝑃 asymmetry is measured to be 0.025±0.015±0.006±0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct 𝐶⁢𝑃 asymmetries of the 𝐵0→𝐾+⁢𝜋− and 𝐵+→𝐾+⁢𝜋0 decays, known as the 𝐾⁢𝜋 puzzle.

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DO - 10.1103/PhysRevLett.126.091802

M3 - Article

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 091802

ER -

Measurement of 𝐶⁢𝑃 Violation in the Decay 𝐵+→𝐾+⁢𝜋0

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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