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D-meson lifetimes within the heavy quark expansion.

Lenz, Alexander and Rauh, Thomas (2013) 'D-meson lifetimes within the heavy quark expansion.', Physical review D., 88 (3). 034004.


Even if new data indicate that direct CP violation in D -meson decays is compatible with the standard model expectation, the first hints for direct CP violation have triggered a lot of interest, and charm phenomenology will remain an essential part of new physics searches due to its unique role as a probe for flavor-changing neutral currents among up-type quarks. Charm physics poses considerable theoretical challenges, because the charm mass is neither light nor truly heavy. The heavy quark expansion (HQE) provides a perturbative expansion in the inverse heavy quark mass for inclusive rates. It has proved to be very successful in the B sector, yet its validity for charm decays has often been questioned. We present results of a HQE study of D -meson lifetimes including NLO QCD and subleading 1/m c corrections. We find good agreement with experimental data, but with huge hadronic uncertainties due to missing lattice input for hadronic matrix elements.

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Publisher statement:Reprinted with permission from the American Physical Society: Alexander Lenz, Thomas Rauh, Physical Review D, 88, 034004, 2013. © 2013 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:17 June 2014
Date of first online publication:August 2013
Date first made open access:No date available

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