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

Abstract

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 dΓ(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.

5 pages, journal version

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• Global analysis of inclusive B decays
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Cited by in corpus (15)

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• Top Jets in the Peak Region: Factorization Analysis with NLL Resummation
• Designing Gapped Soft Functions for Jet Production
• Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in anti-B --> X(s) l+ l-
• Radiative and Electroweak Penguin Decays of B Mesons
• New Physics at a Super Flavor Factory
• Building Blocks for Subleading Helicity Operators
• Extracting short distance information from b -> s l+ l- effectively
• Precise predictions for B -> Xs l+ l- in the large q^2 region
• Heavy-to-light currents at NNLO in SCET and semi-inclusive anti-B ---> X(s) l+ l- decay
• Long distance effects in inclusive rare $B$ decays and phenomenology of $\bar{B}\to X_d{\ell }^{+}{\ell }^{-}$
• Nonperturbative m_X cut effects in B -> Xs l+ l- observables
• Status of SM calculations of b > s transitions
• Subleading Power Factorization in $\bar{B}\to X_s{\ell }^{+}{\ell }^{-}$
• Subleading Shape-Function Effects and the Extraction of |V_ub|