Does the HyperCP Evidence for the DecayΣ+→pμ+μ−Indicate a Light Pseudoscalar Higgs Boson?

Abstract

The HyperCP Collaboration has observed three events for the decay Sigma+ -->p mu+mu- which may be interpreted as a new particle of mass 214.3 MeV. However, existing data from kaon and B-meson decays provide stringent constraints on the construction of models that support this interpretation. In this Letter we show that the "HyperCP particle" can be identified with the light pseudoscalar Higgs boson in the next-to-minimal supersymmetric standard model, the A10. In this model there are regions of parameter space where the A10 can satisfy all the existing constraints from kaon and B-meson decays and mediate Sigma+ -->p mu+mu- at a level consistent with the HyperCP observation.

Rare decays with a lightCP-odd Higgs Boson in the NMSSM

“…To this end, various ideas have been proposed in the literature [8,9]. Specifically, we have demonstrated that a light pseudoscalar Higgs boson in the next-to-minimal supersymmetric standard model (NMSSM), the A 0 1 , could be identified as the possible new particle responsible for the HyperCP events while satisfying all constraints from kaon and B-meson decays [9].…”

“…Here we consider not only the charginomediated diagrams of Refs. [9,14], but also the gluino-and neutralino-mediated diagrams discussed in Ref. [13].…”

“…[9] to be essential to evade the bounds arising from the nonobservation of the A 0 1 in K → πµ + µ − modes [15]. Following our earlier work [4,9], we will here assume that B(A…”

“…To this end, various ideas have been proposed in the literature [8,9]. Specifically, we have demonstrated that a light pseudoscalar Higgs boson in the next-to-minimal supersymmetric standard model (NMSSM), the A 0 1 , could be identified as the possible new particle responsible for the HyperCP events while satisfying all constraints from kaon and B-meson decays [9]. Now, it is long known that kaon decays involving a light Higgs boson, such as in the NMSSM, receive two types of contributions that can be of comparable size: two-quark contributions in which the flavor change occurs in one-loop processes involving the light A 0 1 , and four-quark contributions in which the flavor change occurs via a tree-level standard-model W exchange with the light A 0 1 radiated off one of the light quarks [10,11].…”

Yangian description for decays and possible explanation of X in the decay KL0→π0π0X

“…Stimulated by this exciting new discovery, some important literatures on interpreting and finding this new particle came out: Gorbunov and Rubakov suggested [2] that Sgoldino -superpartner of goldino -may take the responsibility for the anomalous events mentioned above; X.-G. He and his colleague [3] argued that this new "HyperCP particle" can be identified with the light pseudoscalar Higgs boson in the next-to-minimal supersymmetric standard model. The most recent effort in finding this novel particle X was done by Tung et al…”