Inclusive B→ X_s ℓ⁺ℓ^- at the LHC: theory predictions and new-physics reach

2024/04/04 by Huber, Tobias, Hurth, Tobias, Jenkins, Jack +3
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2404.03517

Abstract

We present theoretical predictions for observables in inclusive B→ X_s ℓ⁺ℓ^- suitable for measurements at hadron colliders through a sum-over-exclusive approach. At low q² we calculate the branching ratio and three angular observables. At high q² we provide the branching ratio and the ratio of the B → X_s ℓ⁺ℓ^- rate with respect to the inclusive B → X_u ℓ ν rate with the same phase-space cut. We compare our predictions to the B factory measurements and also to an extraction of the experimental rate through a sum-over-exclusive method using branching ratios of the exclusive B → K^(*)μ⁺μ^- modes measured at LHCb. We find a consistent picture comparing Standard Model theory and experiment. As such, our analysis does not support a recent claim about a deficit in the inclusive branching ratio in the high-q² region. Finally, we present current model-independent bounds on new physics and emphasize the potential of complementary analyses of B→ X_s ℓ⁺ℓ^- at Belle II and the LHC.

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