Executive Summary : | Standard Model (SM) of Particle Physics is a well-tested theory so far but it still does not answer several open questions. To explain these shortcomings of the SM, many new physics (NP) theories have been proposed with possibilities of new particles and interactions. I have been closely associated with the Belle and Belle II experiments since 2011. In Belle (II), precise measurement of the rare B-meson decays provides a powerful way of exploring NP by looking into any deviations from SM prediction. Belle recorded the world's largest e+e- collision data set that led to the Nobel Prize in physics 2008. Belle II is constructed to record at least 50 times more data than Belle at 40 times higher collision rate based on its successful operation. Belle II began its initial physics run in 2019. Now, SuperKEKB is further ramping up the collision rates, and to cope, Belle II will undergo detector-upgrade related two planned shutdowns in 2023 and 2027, respectively. The proposed project is summarized in two segments: [A] Analysis of Belle and Belle II data: In the last few years, measurements from the rare B-meson decays have drawn lots of attention of the community and a number of deviations with the SM in these rare decays has been reported. Recently, we studied the lepton flavor universality ratio with the B-meson decays in Belle and found it to be compatible with the SM expectations within the given statistically dominated uncertainties. We plan to explore NP scenarios in the other rare decays of B mesons by analyzing the large data sets of Belle (II) experiments. These measurements at Belle (II) will complement other experiments, as it provides an independent validation in different background conditions and access to different kinematic regions. Any new measurement related to rare B decays will give important insight to the community and will be highly valuable. [B] High Energy Physics photo-detector laboratory: We wish to get involved in the planned detector upgrade related to Belle II. Earlier, I played a leading role in the development and commissioning of the TOP sub-detector in Belle II. The radiation damage in the high collision rate environment degrades the performance of TOP with time, and its photo-sensors need replacement after aging. There is a plan to replace the TOP photo-sensors from currently installed Micro-channel Plate Photo-multiplier Tubes (MCPPMTs) to Silicon Photo-Multipliers (SiPMs). We wish to participate in these upgrade activities to gain expertise and contribute to works related to the SiPM characterization and its feasibility studies. This SiPM setup will also be beneficial for training our Ph.D. and Master's students with hands-on experiences with detectors. We expect that this participation will bring technical expertise, which may lead to possible societal benefits in the future in areas such as medical physics. |