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Lifetimes and heavy quark expansion.

Lenz, Alexander (2015) 'Lifetimes and heavy quark expansion.', International journal of modern physics A., 30 (10). p. 1543005.


Kolya Uraltsev was one of the inventors of the Heavy Quark Expansion (HQE), that describes inclusive weak decays of hadrons containing heavy quarks and in particular lifetimes. Besides giving a pedagogic introduction to the subject, we review the development and the current status of the HQE, which just recently passed several non-trivial experimental tests with an unprecedented precision. In view of many new experimental results for lifetimes of heavy hadrons, we also update several theory predictions: , τ(Bs)/τ(Bd) = 1.001 ±0.002, τ(Λb)/τ(Bd) = 0.935 ±0.054 and . The theoretical precision is currently strongly limited by the unknown size of the non-perturbative matrix elements of four-quark operators, which could be determined with lattice simulations.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:Electronic version of an article published as International Journal of Modern Physics A, Vol. 30, No. 10 (2015) 1543005 (46 pages) DOI: 10.1142/S0217751X15430058 © World Scientific Publishing Company
Date accepted:No date available
Date deposited:07 December 2015
Date of first online publication:April 2015
Date first made open access:10 April 2016

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