NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l-

Details NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l- NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l-

2002-08-31

arxiv.org/abs/hep-ph/0209006v2

Phys.Rev.D66:094013,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages including 11 postscript figures

Scientific paper

10.1103/PhysRevD.66.094013

We present NNLL results for the double differential decay width dGamma(b -> X_s l+ l-)/(dsh dcos(theta)), where theta is the angle between the momenta of the b-quark and the l+, measured in the rest-frame of the lepton pair. From these results we also derive NNLL results for the lepton forward-backward asymmetries. Genuinely new calculations for the combined virtual- and gluon bremsstrahlung corrections associated with the operators O_7, O_9 and O_10 are necessary. We find that the NNLL corrections drastically reduce the renormalization scale dependence of the forward-backward asymmetries. In particular, sh_0, the position at which the forward-backward asymmetries vanish, is essentially free of uncertainties due to the renormalization scale at NNLL precision. We find sh_0(NNLL)=0.162 +/- 0.005, where the error is dominated by the uncertainty in (m_c/m_b). This is to be compared with sh_0(NLL)=0.144 +/- 0.020, where the error is dominated by uncertainties due to the choice of mu.

Affiliated with

Also associated with

No associations

Rating

NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l- does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l-, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NNLL corrections to the angular distribution and to the forward-backward asymmetries in b -> X_s l+ l- will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-440023