$$f_J(2220)$$ f J ( 2220 ) and hadronic $$\bar{B}^0_s$$ B ¯ s 0 decays

Abstract

We study the hadronicB 0 s decays based on the existence of the resonant state f J (2220). In particular, we are able to explain the unexpected large experimental result of B(B 0 s → J/ψ pp) = (3.0 +1.2 −1.1 ± 0.52 ± 0.03) × 10 −6 measured recently by the LHCb collaboration due to the resonant contribution inB 0 s → J/ψ f J (2220) with f J (2220) → pp, while it is estimated to be at most of order 10 −9 in terms of the OZI rule without the resonance. In addition, we find that B(B 0 s → D * 0 (f J →) pp) = (4.70 ± 2.89) × 10 −7 , B(B 0 s → J/ψ(f J →)ππ) = (15.6 ± 15.2) × 10 −6 , and B(B 0 s → D * 0 (f J →)ππ) = (24.5 ± 24.4) × 10 −7 , while B(B 0 s → J/ψ(f J →)KK) < 1.6 × 10 −5 and B(B 0 s → D * 0 (f J →)KK) < 2.5×10 −6. Moreover, we predict that the decay branching ratios ofB 0 s → (J/ψ, D * 0) ¯ are (2.68 ± 1.23) × 10 −7 and (2.25 ± 0.80) × 10 −6. Some of the predictedB 0 s decays are accessible to the experiments at the LHCb.

First Observation of a BaryonicBs0Decay

“…Their study provides valuable information on the dynamics of hadronic decays of B mesons. The present analysis motivates further theoretical studies of baryonic B 0 s decays in addition to those currently published [6,8,36,37].…”

Observation of B(s)0→J/ψp

“…In summary, the first observation of the B 0 → J=ψpp and B 0 s → J=ψpp decays is reported. The measured branching fraction for the B 0 → J=ψpp decay is consistent with theoretical expectations [10] while that for B 0 s → J=ψpp is enhanced by 2 orders of magnitude with respect to predictions without resonant contributions [10]. More data are needed for glueball and pentaquark searches through a full Dalitz plot analysis.…”

“…1, the B 0 mode is Cabibbo suppressed due to the presence of the Cabibbo-Kobayashi-Maskawa element V cd , while the B 0 s mode is 8,9]. The naïve theoretical expectation for the branching fraction BðB 0 s → J=ψppÞ is at the level of 10 −9 [10]. However, the presence of an intermediate pentaquark or glueball state can enhance the decay rate.…”

“…The authors of Ref. [10] pointed out the potential sensitivity of B 0 s → J=ψpp decays to tensor glueball states via a possible resonant contribution of f J ð2220Þ → pp, which could enhance the B 0 s → J=ψpp decay branching fraction up to order 10 −6 . Hints towards such enhancements were noted in a previous LHCb measurement using 1 fb −1 of pp collision data, where no observation for either mode was made, but a 2.8 standard deviation excess was seen for the B 0 s → J=ψpp decay [11].…”

Spectroscopy at LHCb - exotic states

“…The decay B 0 (s) → J/ψ pp is sensitive to exotic states in J/ψ p system and Glueballs in pp system. The naive theoretical prediction for the branching fraction of B 0 s → J/ψ pp decay is ≈ 10 −9 [6].…”