D-meson lifetimes within the heavy quark expansion

Lenz, Alexander; Rauh, Thomas

Abstract

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.

Citation

Lenz, A., & Rauh, T. (2013). D-meson lifetimes within the heavy quark expansion. Physical Review D, 88(3), Article 034004. https://doi.org/10.1103/physrevd.88.034004

• Journal Article Type: Article
• Publication Date: Aug 5, 2013
• Deposit Date: Jun 13, 2014
• Publicly Available Date: Jun 17, 2014
• Journal: Physical Review D
• Print ISSN: 1550-7998
• Electronic ISSN: 1550-2368
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 88
• Issue: 3
• Article Number: 034004
• DOI: https://doi.org/10.1103/physrevd.88.034004