Programme

P.20 -- Poster, VCTP-49

Date: Wednesday, 31 July 2024

Time: 08:30 - 10:00

Missing energy method for searching heavy neutrinos via $B^{-}\to\ell^{-} N$ decays

Nguyen Hoang Duy Thanh (1), Nguyen Anh Ky (1), Dong Van Thanh (2)

(1) Institute of Physics, VAST; (2) Duy Tan University

We generate and simulate the electron - positron collisions at Upsilon(4S) resonance, the Upsilon(4S) mesons after that decay to $B^{+}B^{-}$ pairs, the $B^{-}$ mesons decay to $\ell^{-} N$ which is our signal and the $B^{+}$ mesons decay generically. The corresponding beam - induced background is also simulated. To minimize the sensitivity, the full event reconstruction algorithm with hadronic tag is performed to reconstruct the $B^{+}$ mesons in the interaction region. With the known information from $B^{+}$, the missing mass, which is theoretically the mass of the heavy neutrino N, can be reconstructed and utilized to search for the N. A set of selections and cuts is applied to reduce the background. The analysis and results are presented in the Poster. It shows the results of the simulation with the heavy neutrino N mass at 3 GeV after those selections and cuts, the background significantly decreases and the missing mass distribution has a peak around the value of the mass of the N, which is expected with high resolution.

Presenter: Nguyen Hoang Duy Thanh