Amplitude analysis of the B s 0 → K ∗ 0 K ¯ ∗ 0 \[ {B}_{(s)}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decays and measurement of the branching fraction of the B 0 → K ∗ 0 K ¯ ∗ 0 \[ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decay

• Published in: The journal of high energy physics Vol. 2019; no. 7; pp. 1 - 31
• Main Authors: P Alvarez Cartelle, Amato, S, Artamonov, A, Audurier, B, Balagura, V, Batozskaya, V, Battig, A, Belous, K, Bertolin, A, Bhasin, S, Blusk, S, Boettcher, T, Bozzi, C, Cadeddu, S, Campora Perez, D H, Chubykin, A, Clemencic, M, Cowan, G A, De Simone, P, Dean, W, Decamp, D, Douglas, L, Féo, M, Filippov, S, Fiutowski, T, ty, R, Funk, W, Gambetta, S, Göbel, C, Gomes, A, Guth, A, Haines, S C, Hamilton, B, Hill, D, Hopchev, P H, Humair, T, Ibis, P, Ilten, P, Inglessi, A, Inyakin, A, Jashal, B K, Jost, B, Karodia, S, Kelsey, M, Krupa, W, Kvaratskheliya, T, Langenbruch, C, P-R, Li, Loh, D, Mackowiak, P, Maguire, K, Malde, S, Malinin, A, Mancinelli, G, Marangotto, D, Martellotti, G, Matiunin, V, McNulty, R, Meinert, N, Mombächer, T, Monteil, S, Murphy, C H, Nanut, T, Nasteva, I, Neubert, S, Ossowska, A, Ovsiannikova, T, Oyanguren, A, Papanestis, A, Pearce, A, Pereima, D, Pinci, D, Polyakov, I, Robert, A, C Santamarina Rios, Satriano, C, Schmelzer, T, Schopper, A, Sciascia, B, Slater, M W, Smith, I T, Spradlin, P, Stagni, F, Stefko, P, Strokov, S, Sun, J, Teubert, F, Tisserand, V, Tomassetti, L, R Vazquez Gomez, C Vázquez Sierra, Vecchi, S, Veltri, M, Viana Barbosa, J V, Viemann, H, Wang, Y, Williams, M, Williams, T, Z Xu, J Yu
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01-07-2019
• Subjects: Amplitudes; Decay; High energy physics; Luminosity; Particle collisions
• ISSN: 1029-8479
• DOI: 10.1007/JHEP07(2019)032

The B0→K∗0K¯∗0\[ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] and Bs0→K∗0K¯∗0\[ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb−1. An untagged and timeintegrated amplitude analysis of B(s)0 → (K+π−)(K−π+) decays in two-body invariant mass regions of 150 MeV/c2 around the K∗0 mass is performed. A stronger longitudinal polarisation fraction in the B0→K∗0K¯∗0\[ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decay, fL = 0.724 ± 0.051 (stat) ± 0.016 (syst), is observed as compared to fL = 0.240 ± 0.031 (stat) ± 0.025 (syst) in the Bs0→K∗0K¯∗0\[ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decay. The ratio of branching fractions of the two decays is measured and used to determine ℬB0→K∗0K¯∗0=8.0±0.9stat±0.4syst×10−7\[ \mathrm{\mathcal{B}}\left({B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0}\right)=\left(8.0\pm 0.9\left(\mathrm{stat}\right)\pm 0.4\left(\mathrm{syst}\right)\right)\times {10}^{-7} \].