%0 Electronic Article %A Aaij, R. and and Abellán Beteta, C. and Adeva, B. and Adinolfi, M. and Aidala, C. A. and Ajaltouni, Z. and Akar, S. and Albicocco, P. and Albrecht, J. and Alessio, F. and Alexander, M. and Alfonso Albero, A. and Alkhazov, G. and Alvarez Cartelle, P. and Alves, A. A. and Amato, S. and Amerio, S. and Amhis, Y. and An, L. and Anderlini, L. and Andreassi, G. and Andreotti, M. and Andrews, J. E. and Archilli, F. and d’Argent, P. and Arnau Romeu, J. and Artamonov, A. and Artuso, M. and Arzymatov, K. and Aslanides, E. and Atzeni, M. and Audurier, B. and Bachmann, S. and Back, J. J. and Baker, S. and Balagura, V. and Baldini, W. and Baranov, A. and Barlow, R. J. and Barrand, G. C. and Barsuk, S. and Barter, W. and Bartolini, M. and Baryshnikov, F. and Batozskaya, V. and Batsukh, B. and Battig, A. and Battista, V. and Bay, A. and Beddow, J. and Bedeschi, F. and Bediaga, I. and Beiter, A. and Bel, L. 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C. and Zhang, Y. and Zhelezov, A. and Zheng, Y. and Zhu, X. and Zhukov, V. and Zonneveld, J. B. and Zucchelli, S. %I Springer Science and Business Media LLC %D 2019 %D 2019 %G English %@ 1029-8479 %~ Katalog UB TU-Chemnitz %T Observation of the doubly Cabibbo-suppressed decay Ξ+ c → pϕ %V 2019 %J Journal of High Energy Physics %V 2019 %N 4 %U http://dx.doi.org/10.1007/jhep04(2019)084 %X Abstract The doubly Cabibbo-suppressed decay Ξ c +  →  with ϕK + 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 Ξ c +  →  and the singly Cabibbo-suppressed decay Ξ c +  → pK π + is measured to be $$ \frac{\mathrm{\mathcal{B}}\left({\varXi}_c^{+}\to p\phi \right)}{\mathrm{\mathcal{B}}\left({\varXi}_c^{+}\to p{K}^{-}{\pi}^{+}\right)}=\left(19.8\pm 0.7\pm 0.9\pm 0.2\right)\times {10}^{-3}, $$ Ξ c + p ϕ Ξ c + p K π + = 19.8 ± 0.7 ± 0.9 ± 0.2 × 10 3 , where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the ϕK + K branching fraction. %Z https://katalog.bibliothek.tu-chemnitz.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAwNy9qaGVwMDQoMjAxOSkwODQ %U https://katalog.bibliothek.tu-chemnitz.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAwNy9qaGVwMDQoMjAxOSkwODQ