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Invisible Quarkonium Decays as a Sensitive Probe of Dark Matter | | Bob McElrath
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15 Jun 2005 | | Subject: | hep-ph hep-ex | | Abstract: | We examine in a model-independent manner the measurements that can be performed at B-factories with sensitivity to dark matter. If a singlet scalar, pseudo-scalar, or vector is present and mediates the Standard Model - dark matter interaction, it can mediate invisible decays of quarkonium states such as the $Upsilon$, $J/Psi$, and $eta$. Such scenarios have arisen in the context of supersymmetry, extended Higgs sectors, solutions the supersymmetric $mu$ problem, and extra U(1) gauge groups from grand unified theories and string theory. Existing B-factories running at the $Upsilon(4S)$ can produce lower $Upsilon$ resonances by emitting an Initial State Radiation (ISR) photon. Using a combination of ISR and radiative decays, the initial state of an invisibly decaying quarkonium resonance can be tagged, giving sensitivity to the spin and CP-nature of the particle that mediates standard model-dark matter interactions. These measurements can discover or place strong constraints on dark matter scenarios where the dark matter is approximately lighter than the $b$-quark. For the decay chains $Upsilon(nS) o pi^+ pi^- Upsilon(1S)$ (n=2,3) we analyze the dominant backgrounds and determine that with $400 fb^{-1}$ collected at the $Upsilon(4S)$, the B-factories can limit $BR(Upsilon(1S) o invisible) lsim 0.1%$. | | Source: | arXiv, hep-ph/0506151 | | Services: | Forum | Review | PDF | Favorites | |
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