Constraining electroweak penguin graph contributions in measurements of the CKM phase alpha using B→ππ and B→ρρ decays

Nayak, Abinash Kumar and Sinha, Rahul and Karan, Anirban and et al, . (2020) Constraining electroweak penguin graph contributions in measurements of the CKM phase alpha using B→ππ and B→ρρ decays. Physical Review D, 101 (7). pp. 1-6. ISSN 2470-0010

Text
PhysRevD.pdf - Published Version
Available under License Creative Commons Attribution.
Download (5MB)

Abstract

The unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix has been well established by both direct and indirect measurements without any evidence of discrepancy. The CKM weak phase α is directly measured using an isospin analysis in B→ππ and B→ρρ assuming that electroweak penguin contributions are ignorable. However, electroweak penguins are sensitive to NP, hence, it is important to experimentally estimate their effects. We determine the size of both electroweak penguin and isospin amplitudes, directly from B→ππ and B→ρρ experimental data, using in addition the indirectly measured value of α. We find that electroweak penguin contribution are indeed small and agree with SM expectations within 1σ. We also find that there is a mild enhancement of the ΔI=12 transition amplitude. © 2020 authors. Published by the American Physical Society.

[error in script]

IITH Creators:

IITH Creators	ORCiD

Item Type:

Article

Additional Information:

A. K. N. and R. S. would like to thank Sunando Kumar Patra for useful discussions. B. G. thanks Institute of Mathematical Sciences for hospitality where part of the work was done. B. G. was supported in part by the US Department of Energy Grant No. de-sc0009919. A. K. thanks SERB India, Grant no: SERB/PHY/F181/2018-19/G210, for support. R. S. thanks Perimeter Institute for Theoretical Physics for hospitality where part of this work was done. Research at Perimeter Institute is supported by the Government of Canada through the Department of Innovation, Science and Economic Development and by the Province of Ontario through the Ministry of Research, Innovation and Science.

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

27 Oct 2022 11:41

Last Modified:

27 Oct 2022 11:41

URI:

http://raiithold.iith.ac.in/id/eprint/11078