Oscillations of $$ {B}_s^0 $$ Mesons as a Probe of Decays with Unreconstructed Particles

Abstract

A new experimental technique to study the decays of B 0 s mesons into the final states involving unreconstructable particles is proposed. The method uses a characteristic feature of fast flavour oscillations of B 0 s mesons. Analysis of the oscillation spectrum of partially reconstructed flavour-tagged B 0 s decays provides information about the mass spectrum of invisible states in these decays and removes any background which does not come from the decays of B 0 s mesons.

Unleashing the full power of LHCb to probe stealth new physics

“…Importantly, the exact mass of ψ would not be fully reconstructed and so one would require a handle on irreducible SM backgrounds such as B + → B + n. Nevertheless, the analysis in [197] shows that LHCb could reach sensitivities at the level of Br ∼ 10 −7 -10 −5 . • A possibility that was recently put forward in [198] relies on the fact that B 0 s oscillate to use the reconstructed B baryon in order to have a handle on the ψ mass and new non-standard decay rate. Although [198] did not fully study the sensitivity to Br (B → ψ + B + M), it is an interesting future possibility.…”

Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery

“…However, Ref. [97] has pointed out that one could gain a handle on the mass of ψ by studying the oscillation pattern of B 0 s → ψ B decays. Given that this approach needs to trigger on the B 0 s → ψ B decay explicitly, it necessarily requires searches such as the ones described in the two previous paragraphs to find the decay first.…”

“…IV C, we have commented on the opportunities and difficulties when searching for the new decay modes of B mesons and b-flavored baryons at the LHC. Although recent ideas to target these decays have been put forward [43,97,98], evaluating the possible impact of direct LHC searches on the parameter space of B-Mesogenesis remains an exciting avenue to explore. -Searches at BaBar, Belle and Belle II: In Sec.…”

Unleashing the full power of LHCb to probe Stealth New Physics

“…• A possibility that was recently put forward in [190] relies on the fact that B 0 s oscillate to use the reconstructed B baryon in order to have a handle on the ψ mass and new non-standard decay rate. Although Ref.…”

“…Although Ref. [190] did not fully study the sensitivity to Br (B → ψ + B + M), it is an interesting future possibility.…”