On the Possibility of a New Boson X^0 (214 MeV) in Sigma^+ -> p mu^+ mu^-

Details On the Possibility of a New Boson X^0 (214 MeV) in Sigma^+ -> p mu^+ mu^- On the Possibility of a New Boson X^0 (214 MeV) in Sigma^+ -> p mu^+ mu^-

2005-09-09

arxiv.org/abs/hep-ph/0509081v2

Phys.Lett. B632 (2006) 212-214

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages; typos corrected, references added, 7 pages

Scientific paper

10.1016/j.physletb.2005.10.050

We consider the existence of the state X^0 (214 MeV) in Sigma^+ -> p mu^+ mu^- decay found by the HyperCP collaboration. We assume that a fundamental spin zero boson X^0 coupled to quarks leads to flavor changing s -> d X^0 process. We estimate the scalar and pseudoscalar coupling constants by considering Sigma^+ -> p X^0 and K^+ -> pi^+ X^0 processes, and find that pseudoscalar coupling dominates. We then evaluate the branching ratios for K_L -> pi^0 pi^0 X^0, pi^+ pi^- X^0 and Omega^- -> Xi^- X^0 decays. All these rates are found to be in the measurable ranges. We also comment on X^0 coupling to muons and constraints from muon g-2.

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