Publication
A broad peaking structure is observed in the dimuon spectrum of B+ -> K+mu(+)mu(-) decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with interference between the B+ -> K+mu(+)mu(-) decay and a resonance and has a statistical significance exceeding six standard deviations. The mean and width of the resonance are measured to be 4191(-8)(+9) MeV/c(2) and 65(-16)(+22) MeV/c(2), respectively, where the uncertainties include statistical and systematic contributions. These measurements are compatible with the properties of the psi(4160) meson. First observations of both the decay B+ -> psi(4160)K+ and the subsequent decay psi(4160) -> mu(+)mu(-) are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770 MeV/c(2). This contribution is larger than theoretical estimates.
Matthias Finger, Qian Wang, Yiming Li, Varun Sharma, Konstantin Androsov, Jan Steggemann, Xin Chen, Rakesh Chawla, Matteo Galli, Jian Wang, João Miguel das Neves Duarte, Tagir Aushev, Matthias Wolf, Yi Zhang, Tian Cheng, Yixing Chen, Werner Lustermann, Andromachi Tsirou, Alexis Kalogeropoulos, Andrea Rizzi, Ioannis Papadopoulos, Paolo Ronchese, Hua Zhang, Siyuan Wang, Tao Huang, David Vannerom, Michele Bianco, Sebastiana Gianì, Sun Hee Kim, Kun Shi, Abhisek Datta, Federica Legger, Gabriele Grosso, Anna Mascellani, Ji Hyun Kim, Donghyun Kim, Zheng Wang, Sanjeev Kumar, Wei Li, Yong Yang, Ajay Kumar, Ashish Sharma, Georgios Anagnostou, Joao Varela, Csaba Hajdu, Muhammad Ahmad, Ioannis Evangelou, Milos Dordevic, Meng Xiao, Sourav Sen, Xiao Wang, Kai Yi, Jing Li, Rajat Gupta, Hui Wang, Seungkyu Ha, Pratyush Das, Anton Petrov, Xin Sun, Valérie Scheurer, Muhammad Ansar Iqbal
Nicolas Lawrence Etienne Longeard