Browsing by Author "Dib Claudio O."
Probing R-parity violation in B-meson decays to a baryon and a light neutralino
(SPRINGER, 2023/02/22) Dib Claudio O.; Helo Juan Carlos; Lyubovitskij Valery E.; Neill Nicolas A.; Soffer Abner; Wang Zeren Simon
We propose a search for B meson decays to a baryon plus missing energy at the Belle II experiment to probe supersymmetry with a GeV-scale lightest neutralino (X) over bar (0)(1) and R-parity violation (RPV). We perform analytic computations of the signal branching fractions in the framework of effective field theory, with a single nonzero RPV operator lambda(ij3)''(U) over bar (C)(i) (D) over barj(C) (D) over bar (C)(3) , where i, j = 1, 2. The hadronic form factors are calculated using an SU(3) phenomenological Lagrangian approach for the proton, as well as several hyperons and charmed baryons. Since the decay of the neutralino is kinematically and CKM suppressed in this theoretical scenario, it decays outside the detector and appears experimentally only as missing energy. We detail the analysis techniques at the experimental level and estimate the background in the B+ -> p (X) over bar (0)(1) search using published results for B+ -> K+nu(nu) over bar. Our final sensitivity plots are shown for both lambda ''(113) versus the squark mass m((q) over bar) and lambda ''(113)/m((q) over bar)(2) versus the neutralino mass m((X) over bar 10). We find that the search at Belle II could probe lambda ''(113)/m((sic))(2) down to the order of 10(-8) GeV-2 in the kinematically allowed m((X) over bar 10) range. We also obtain current limits on lambda ''(123) by recasting an existing search interpreted as B-0 lambda(0)(X) over tilde (0)(1), and comment about searches for B+ -> sigma(+) (X) over tilde (0)(1), B-0 sigma(0)(X) over tilde (0)(1), B+ -> lambda(+)(c)(X) over tilde (0)(1), and B+ Xi(+)(c) (X) over tilde (0)(1). In closing, we briefly discuss potential searches at the LHCb and BESIII experiments.