Search for new physics in rare B decays

Abstract

A search for the decay B " ™K " K " p . was performed using data collected by the OPAL detector at LEP. These decays are strongly suppressed in the Standard Model but could occur with a higher branching ratio in supersymmetric models, especially in those with R-parity violating couplings. No evidence for a signal was observed and a 90% confidence level upper limit of 1.29 = 10 y4 was set for the branching ratio. q

Semialigned two Higgs doublet model

“…In the SM, this proceeds via the box diagram and is highly suppressed by the Glashow-Iliopoulos-Maiani mechanism as Br SM ½b → ssd ¼ Oð10 −12 Þ [28,29]. For the corresponding exclusive mode, experimental searches have been performed [30] and recently, the LHCb collaboration has reported Br½B − → K − K − π þ < 1.1 × 10 −8 ð90% CLÞ [31]. In Ref.…”

b → ssd̄ in a Vector Quark Model

“…The corresponding exclusive decays (e.g. B − → K − K − π + ) have also been searched experimentally by different groups [3], which provides further constrains on the new physics models.…”

ΔS = 2 decays of B− meson in MSSM and two Higgs doublet model

“…The estimation of the upper limit of the branching ratio gives BR(B − → K * −K 0 ) R ≤ 4.4 × 10 −8 . This limit can be raised to 1.5 × 10 −6 for the upper bound on the couplings of 5.9×10 −4 given in [5]. The two Higgs doublet model (4) gives for the limit |ξ sb ξ sd |/m 2 H > 10 −10 GeV −2 , a branching ratio of the order 10 −11 .…”

“…Moreover, when one considers supersymmetric models with R-parity violating couplings, it turned out that the existing bounds on the involved couplings of the superpotential did not provide any constraint on the b → ssd mode [2]. Recently, the OPAL collaboration [5] has set lower bounds on these couplings from the establishment of an upper limit for the B − →…”

“…Taking the values of the quark masses as in [11] m b = 4.88 GeV , m s = 122 M eV , m d = 7.6 M eV and using the bound given above, we estimate the upper limit of the branching ratio BR(B − → K − K − π + ) R ≤ 1.8 × 10 −7 . This limit can be raised to 6 × 10 −6 for the upper bound on the couplings of 5.9 × 10 −4 given in [5].…”