期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
卷 30, 期 10, 页码 -出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217751X15430058
关键词
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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: tau (B+)/tau(B-d) = 1.04(-0.01)(+0.05) +/- 0.02 +/- 0.01, tau(B-s)/tau(B-d) = 1.001 +/- 0.002, tau(A(b))/tau(B-d) = 0.935 +/- 0.054 and (tau) over bar(Xi(0)(b))/(tau) over bar(Xi(+)(b)) = 0.95 +/- 0.06. 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.
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