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Displaced Searches for Light Vector Bosons at Belle II

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arxiv 2203.03280 v2 pith:OEQVD5C4 submitted 2022-03-07 hep-ph hep-ex

Triparno Bandyopadhyay , Sabyasachi Chakraborty , Sokratis Trifinopoulos This is my paper · ORCID
classification hep-phhep-ex
keywords bellemodelsregionsvectorbosonbosonsexperimentlight
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abstract

With a design luminosity of 50 ab$^{-1}$ and detectors with tracking capabilities extending beyond 1 m, the Belle II experiment is the perfect laboratory for the search of particles that couple weakly to the Standard Model and have a characteristic decay length of a few centimetres and more. We show that for models of dark photons and other light vector bosons, Belle II will be successful in probing regions of parameter space which are as of now unexplored by any experiment. In addition, for models where the vector boson couples sub-dominantly to the electron and quarks as compared to muons, e.g. in the $L_\mu-L_\tau$ model, Belle II will probe regions of mass and couplings compatible with the anomalous magnetic moment of muon. We discuss these results and derive the projected sensitivity of Belle II for a handful of other models. Finally, even with the currently accumulated data, $\sim 200$ fb$^{-1}$, Belle II should be able to cover regions of parameter space pertaining to the X(17) boson postulated to solve the ATOMKI anomaly.

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Cited by 4 Pith papers

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  4. Potential for the discovery of the protophobic boson at the STCF

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    Detector-level simulations indicate the proposed STCF drift chamber could discover the 17 MeV protophobic X17 boson through displaced electron-positron vertices if Standard Model backgrounds stay below about 10^4 even...

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