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 x 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.
Search for W boson decays to three charged pions / Belforte, S.; Candelise, V.; Casarsa, M.; Cossutti, F.; DA ROLD, A.; DELLA RICCA, G.; Vazzoler, F.; Zanetti, A.; ET AL (the CMS, Collaboration). - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 122:15(2019), pp. 151802.1-151802.17. [10.1103/PhysRevLett.122.151802]
Search for W boson decays to three charged pions
CANDELISE, V.;DA ROLD, A.;DELLA RICCA, G.;VAZZOLER, F.;
2019-01-01
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 x 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.| File | Dimensione | Formato | |
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PhysRevLett.122.151802.pdf
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