D* polarization as a probe to discriminate new physics in B¯→D*τν¯

D* polarization as a probe to discriminate new physics in B¯→D*τν¯ The confirmation of excess in RD* at the LHCb is an indication of lepton flavor nonuniversality. Various different new physics operators and their coupling strengths, which provide a good fit to RD, RD*, and q2 spectra, were identified previously. In this work, we try to find angular observables in B¯→D*τν¯ which enable us to distinguish between these new physics operators. We find that the D* polarization fraction fL(q2) is a good discriminant of scalar and tensor new physics operators. The change in ⟨fL(q2)⟩, induced by scalar and tensor operators, is about 3 times larger than the expected uncertainty in the upcoming Belle measurement. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

D* polarization as a probe to discriminate new physics in B¯→D*τν¯

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D* polarization as a probe to discriminate new physics in B¯→D*τν¯

Abstract

The confirmation of excess in RD* at the LHCb is an indication of lepton flavor nonuniversality. Various different new physics operators and their coupling strengths, which provide a good fit to RD, RD*, and q2 spectra, were identified previously. In this work, we try to find angular observables in B¯→D*τν¯ which enable us to distinguish between these new physics operators. We find that the D* polarization fraction fL(q2) is a good discriminant of scalar and tensor new physics operators. The change in ⟨fL(q2)⟩, induced by scalar and tensor operators, is about 3 times larger than the expected uncertainty in the upcoming Belle measurement.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.95.115038
Publisher site
See Article on Publisher Site

Abstract

The confirmation of excess in RD* at the LHCb is an indication of lepton flavor nonuniversality. Various different new physics operators and their coupling strengths, which provide a good fit to RD, RD*, and q2 spectra, were identified previously. In this work, we try to find angular observables in B¯→D*τν¯ which enable us to distinguish between these new physics operators. We find that the D* polarization fraction fL(q2) is a good discriminant of scalar and tensor new physics operators. The change in ⟨fL(q2)⟩, induced by scalar and tensor operators, is about 3 times larger than the expected uncertainty in the upcoming Belle measurement.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jun 1, 2017

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