Universality and m_X cut effects in B -> Xs l+ l-

Details Universality and m_X cut effects in B -> Xs l+ l- Universality and m_X cut effects in B -> Xs l+ l-

2005-12-15

arxiv.org/abs/hep-ph/0512191v2

Phys.Rev. D74 (2006) 011501(R)

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, journal version

Scientific paper

10.1103/PhysRevD.74.011501

The most precise comparison between theory and experiment for the B -> Xs l+ l- rate is in the low q^2 region, but the hadronic uncertainties associated with an experimentally required cut on m_X potentially spoil the search for new physics in these decays. We show that a 10-30% reduction of d\Gamma(B -> Xs l+ l-) / dq^2 due to the m_X cut can be accurately computed using the B -> X_s gamma shape function. The effect is universal for all short distance contributions in the limit m_X^2 << m_B^2, and this universality is spoiled neither by realistic values of the m_X cut nor by alpha_s corrections. Both the differential decay rate and forward-backward asymmetry with an m_X cut are computed.

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