Lenz, Alexander (2015) 'Lifetimes and heavy quark expansion.', in QCD and heavy quarks : in memoriam Nikolai Uraltsev. New Jersey: World Scientific, pp. 63-109.
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 into 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 (B+)/τ (Bd) = 1.04+0.05 −0.01 ± 0.02 ± 0.01, τ (Bs)/τ (Bd) = 1.001 ± 0.002, τ (b)/τ (Bd) = 0.935 ± 0.054 and ¯τ (0b )/¯τ (+ b ) = 0.95 ± 0.06. The theoretical precision is currently strongly limited by the unknown size of the nonperturbative matrix elements of four-quark operators, which could be determined with lattice simulations.
|Item Type:||Book chapter|
|Full text:||(AM) Accepted Manuscript|
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|Publisher Web site:||http://www.worldscientific.com/worldscibooks/10.1142/9157|
|Publisher statement:||Lifetimes and heavy quark expansion, Alexander Lenz, in QCD and heavy quarks : in memoriam Nikolai Uraltsev, ed. by Ikaros I Bigi, Paolo Gambino, Thomas Mannel Copyright @ 2015 with permission from World Scientific Publishing Co. Pte. Ltd.|
|Date accepted:||No date available|
|Date deposited:||28 January 2016|
|Date of first online publication:||July 2015|
|Date first made open access:||No date available|
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