Journal of High Energy Physics > 2019 > 2019 > 4 > 1-18
Observation of the doubly Cabibbo-suppressed decay Ξc+ → pϕ
Source
Abstract
The doubly Cabibbo-suppressed decay Ξc+ → pϕ with ϕ → K+K− is observed for the first time, with a statistical significance of more than fifteen standard deviations. The data sample used in this analysis corresponds to an integrated luminosity of 2 fb−1 recorded with the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The ratio of branching fractions between the decay Ξc+ → pϕ and the singly Cabibbo-suppressed decay Ξc+ → pK−π+ is measured to be ℬ Ξ c + → p ϕ ℬ Ξ c + → p K − π + = 19.8 ± 0.7 ± 0.9 ± 0.2 × 10 − 3 , $$ \frac{\mathrm{\mathcal{B}}\left({\varXi}_c^{+}\to p\phi \right)}{\mathrm{\mathcal{B}}\left({\varXi}_c^{+}\to p{K}^{-}{\pi}^{+}\right)}=\left(19.8\pm 0.7\pm 0.9\pm 0.2\right)\times {10}^{-3}, $$
where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the ϕ → K+K− branching fraction.
Identifiers
journal e-ISSN : | 1029-8479 |
DOI | 10.1007/JHEP04(2019)084 |
Authors
The LHCb collaboration
- University of Bristol, H.H. Wills Physics Laboratory, Bristol, United Kingdom
B. Adeva
- Universidade de Santiago de Compostela, Instituto Galego de Física de Altas Enerxías (IGFAE), Santiago de Compostela, Spain