B,B(s)> K form factors: An update of lightcone sum rule results
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Relacija 
http://fulir.irb.hr/525/
http://link.aps.org/doi/10.1103/PhysRevD.78.054015 10.1103/PhysRevD.78.054015 

Naslov 
B,B(s)> K form factors: An update of lightcone sum rule results


Autor 
Duplančić, Goran
Melić, Blaženka 

Tema 
Physics
Astronomy and Astrophysics 

Opis 
We present an improved QCD lightcone sum rule (LCSR) calculation of the B > K and B(s) > K form factors by including SU(3)symmetry breaking corrections. We use recently updated K meson distribution amplitudes which incorporate the complete SU(3)breaking structure. By applying the method of direct integration in the complex plane, which is presented in detail, the analytical extraction of the imaginary parts of LCSR hardscattering amplitudes becomes unnecessary and therefore the complexity of the calculation is greatly reduced. The values obtained for the relevant B((s)) > K form factors are as follows: f(BK)(+)(0) = 0.36(0.04)(+0.05), f(BsK)(+)(0) = 0.30(0.03)(+0.04) and f(BK)(T)(0) = 0.30 +/ 0.05. By comparing among the B > pi form factors extracted recently by the same method, we find the following SU(3) violation among the B > light form factors: f(BK)(+)(0)/f(B pi)(+)(0) = 1.38(0.10)(+0.11), f(BsK)(+)(0)/f(B pi)(+)(0) = 1.15(0.09)(+0.17), f(BK)(T)(0)/f(B pi)(T)(0) = 1.49(0.06)(+0.18), and f(BsK)(T)(0)/f(B pi)(T)(0) = 1.17(0.11)(+0.15).


Izdavač 
American Physical Society


Datum 
2008


Vrsta resursa 
Article
PeerReviewed 

Format (na primjer PDF) 
application/pdf


Jezik 
hr
english 

Identifikator 
http://fulir.irb.hr/525/1/PhysRevD%282008%2978.054015.pdf
Duplančić, Goran; Melić, Blaženka (2008) B,B(s)> K form factors: An update of lightcone sum rule results. Physical Review D, 78 (5). 054015105401512. ISSN 15507998 
