Download or read book Search for Dark Matter in Events with a Photon and Missing Transverse Momentum in Pp Collisions at √ S written by Fuquan Wang and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the search for dark matter in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the LHC. The data of proton-proton collisions is collected in 2012 and 2015, corresponds to 20.3 fb−1 data with center-of-mass energy of 8 TeV and 3.2 fb−1data with center-of-mass energy of 13 TeV, respectively. The observed data is well described by the expected Standard Model backgrounds. The expected (observed) upper limit on the fiducial cross section for the production of events with a photon and large missing transverse momentum at 95% confidence level is 6.1 (5.3) fb with the 8 TeV data set and 25.5 (17.8) fb with the 13 TeV data set. Exclusion limits are presented on models of direct pair production of dark-matter candidates.