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Testing for new physics in singly Cabibbo suppressed D decays

Yuval Grossman1,*, Alexander L. Kagan2,†, and Jure Zupan2,‡

  • 1Institute for High Energy Phenomenology, Newman Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853, USA
  • 2Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA

  • *yg73@cornell.edu
  • †kaganalexander@gmail.com
  • ‡zupanje@ucmail.uc.edu; On leave of absence from Josef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia.
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Phys. Rev. D 85, 114036 – Published 21 June, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.114036

Abstract

We devise tests for a new physics origin of the recently measured direct CP violation in singly Cabibbo-suppressed D decays. The tests take the form of sum rules for the CP asymmetries in various D decays. They are based on the fact that within the standard model CP violation arises from interference of the dominant tree amplitudes with the ΔI=1/2 penguin amplitudes. The sum rules would be violated if the observed CP violation is due to new physics contributions to the effective weak Hamiltonian that change the isospin by ΔI=3/2.

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Phys. Rev. D 85, 114036– Published 21 June, 2012
  • Received 9 May 2012
Article part of CHORUS

© 2012 American Physical Society

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