Search for W Boson Decays to Three Charged Pions

CMS Collaboration; Sirunyan, A. M.; KAPOOR, A.; HEGDE, V.; RASTOGI, A.; KOTHEKAR, K.; CHAUHAN, S.; DUBE, SOURABH; PANDEY, S.; SHARMA, SEEMA et al.; RANE, A.

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Search for W Boson Decays to Three Charged Pions

CMS Collaboration; Sirunyan, A. M.; CHAUHAN, S.; DUBE, SOURABH; HEGDE, V.; KAPOOR, A.; KOTHEKAR, K.; PANDEY, S.; RANE, A.; RASTOGI, A.; SHARMA, SEEMA et al.

URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3076 https://doi.org/10.1103/PhysRevLett.122.151802 Date: 2019-04

Abstract:

For the first time, a search for the rare decay of the W boson to three charged pions has been performed. Proton-proton collision data recorded by the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 77.3 fb −1 , have been analyzed. No significant excess is observed above the background expectation. An upper limit of 1.01 × 10 − 6 is set at 95% confidence level on the branching fraction of the W boson to three charged pions. This provides a strong motivation for theoretical calculations of this branching fraction.

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