Light-cone sum rules for B ->pi form factors revisited

Duplančić, Goran; Khodjamirian, A.; Mannel, Th.; Melić, Blaženka; Offen, N (2008) Light-cone sum rules for B ->pi form factors revisited. Journal of High Energy Physics (4). 014-1. ISSN 1029-8479

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Abstract

We reconsider and update the QCD light-cone sum rules for B ->pi form factors. The gluon radiative corrections to the twist-2 and twist-3 terms in the correlation functions are calculated. The (MS) over bar b-quark mass is employed, instead of the one-loop pole mass used in the previous analyses. The light-cone sum rule for f(B pi)(+)(q(2)) is fitted to the measured q(2)-distribution in B ->pi l nu(l), fixing the input parameters with the largest uncertainty: the Gegenbauer moments of the pion distribution amplitude. For the B ->pi vector form factor at zero momentum transfer we predict f(B pi)(+)(0)=0.26(-0.030)(+0.04). Combining it with the value of the product vertical bar V(ub)f(B pi)(+)(0)vertical bar extracted from experiment, we obtain vertical bar V-ub vertical bar=(3.5 +/- 0.4 +/- 0.2 +/- 0.1)x10(-3). In addition, the scalar and penguin B ->pi form factors f(B pi)(0)(q(2)) and f(B pi)(T)(q(2)) are calculated.

Item Type:	Article
Uncontrolled Keywords:	quantum chromodynamics; heavy-quark; b-meson; asymptotic-behavior; evolution-equations; exclusive processes; qcd factorization; decays; b->pi; twist
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Fundamentalne interakcije u fizici elementarnih čestica i kozmologiji [3635] Nevenko Bilić 098-0982930-2864 MZOS
Depositing User:	Blaženka Melić
Date Deposited:	29 May 2013 14:23
URI:	http://fulir.irb.hr/id/eprint/535
DOI:	10.1088/1126-6708/2008/04/014

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