Observation of the decay \(B_s^0 \to \overline{D}^0 K^+ K^-\)

• Published in: arXiv.org
• Main Authors: collaboration, LHCb, Alves, A A, Andreotti, M, Arzymatov, K, Barsuk, S, Beddow, J, Bel, L J, Belloli, N, Belyaev, I, Berninghoff, D, Bozzi, C, Calladine, R, Capriotti, L, Chatzikonstantinidis, G, Chen, C, X Cid Vidal, Couturier, B, M Cruz Torres, De Capua, S, Dujany, G, Durante, P, Durham, J M, Dziurda, A, Dzyuba, A, Evans, T, Fiorini, M, J Fu, Gabriel, E, Gerick, D, Giubega, L, Gligorov, V V, Golutvin, A, Graziani, G, Göbel, C, Hancock, T H, Harnew, S T, J He, Hill, D, Ivshin, K, Khurewathanakul, C, Langenbruch, C, Likhomanenko, T, Lopes, J H, M Lucio Martinez, Maltsev, T, Manca, G, Marchand, J F, Matev, R, Meaux, C, Millard, E, Minzoni, L, Morello, G, Mulder, M, Nanut, T, Nasteva, I, Neuner, M, Nikitin, N, Ossowska, A, Pastore, A, Patrignani, C, Pearce, A, Perret, P, Petrov, A, Polukhina, N, Poslavskii, S, Qian, W, M Ramos Pernas, Richards, S, Saitta, B, Guimaraes, V Salustino, Santimaria, M, Sarpis, G, Sarti, A, Schwemmer, R, Sciascia, B, Semennikov, A, Sepulveda, E S, Serrano, J, Sestini, L, Shears, T, R Silva Coutinho, Silva de Oliveira, L, Stefko, P, Stone, S, Stracka, S, Stramaglia, M E, Szumlak, T, T'Jampens, S, Tayduganov, A, Tonelli, D, Traill, M, Ukleja, A, Valat, S, Venkateswaran, A, Viemann, H, Vilasis-Cardona, X, Wang, M, Wang, Y, Wilkinson, M, Williams, T
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 08.11.2018
• Subjects: Decay; Luminosity; Uncertainty
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1807.01891

The first observation of the \(B_s^0 \to \overline{D}^0 K^+ K^-\) decay is reported, together with the most precise branching fraction measurement of the mode \(B^0 \to \overline{D}^0 K^+ K^-\). The results are obtained from an analysis of \(pp\) collision data corresponding to an integrated luminosity of \(3.0~\textrm{fb}^{-1}\). The data were collected with the LHCb detector at centre-of-mass energies of \(7\) and \(8\) TeV. The branching fraction of the \(B^0 \to \overline{D}^0 K^+ K^-\) decay is measured relative to that of the decay \(B^0 \to \overline{D}^0 \pi^+ \pi^-\) to be $$\frac{\mathcal{B}(B^0 \to \overline{D}^0 K^+ K^-)}{\mathcal{B}(B^0 \to \overline{D}^0 \pi^+ \pi^-)} = (6.9 \pm 0.4 \pm 0.3)\%,$$ where the first uncertainty is statistical and the second is systematic. The measured branching fraction of the \(B_s^0 \to \overline{D}^0 K^+ K^-\) decay mode relative to that of the corresponding \(B^0\) decay is $$\frac{\mathcal{B}(B_s^0 \to \overline{D}^0 K^+ K^-)}{\mathcal{B}(B^0 \to \overline{D}^0 K^+ K^-)} = (93.0 \pm 8.9 \pm 6.9)\%.$$ Using the known branching fraction of \({B^0 \to \overline{D}^0 \pi^+ \pi^-}\), the values of \({{\mathcal B}(B^0 \to \overline{D}^0 K^+ K^- )=(6.1 \pm 0.4 \pm 0.3 \pm 0.3) \times 10^{-5}}\), and \({{\cal B}(B_s^0 \to \overline{D}^0 K^+ K^-)=}\) \((5.7 \pm 0.5 \pm 0.4 \pm 0.5) \times 10^{-5}\) are obtained, where the third uncertainties arise from the branching fraction of the decay modes \({B^0 \to \overline{D}^0 \pi^+ \pi^-}\) and \(B^0 \to \overline{D}^0 K^+ K^-\), respectively.