Search for supersymmetry in a final state containing two photons and missing transverse momentum in √s = 13 TeV pp collisions at the LHC using the ATLAS detector

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Aaboud, M. ; Aad, G. ; Abbott, B. ; Abdallah, J. ; Abdinov, O. ; Abeloos, B. ; Aben, R. ; AbouZeid, O. S. ; Abraham, N. L. ; Abramowicz, H. ; Abreu, H. ; Abreu, R. ; Abulaiti, Y. ; Acharya, B. S. ; Adachi, S. ; Adamczyk, L. ; Adams, D. L. ; Adelman, J. ; Adomeit, S. ; Adye, T. ; Affolder, A. A. ; Agatonovic-Jovin, T. ; Agricola, J. ; Aguilar-Saavedra, J. A. ; Ahlen, S. P. ; Ahmadov, F. ; Aielli, G. ; Akerstedt, H. ; Åkesson, T. P. A. ; Akimov, A. V. ... view all 2,863 authors (2016)

A search has been made for supersymmetry in\ud a final state containing two photons and missing transverse\ud momentum using the ATLAS detector at the Large Hadron\ud Collider. The search makes use of 3.2 fb−1 of proton-proton\ud collision data collected at a centre-of-mass energy of 13 TeV\ud in 2015. Using a combination of data-driven and MonteCarlo-based\ud approaches, the Standard Model background is\ud estimated to be 0.27+0.22 −0.10 events. No events are observed in\ud the signal region; considering the expected background and\ud its uncertainty, this observation implies a model-independent\ud 95 % CL upper limit of 0.93 fb (3.0 events) on the visible\ud cross section due to physics beyond the Standard Model. In\ud the context of a generalized model of gauge-mediated supersymmetry\ud breaking with a bino-like next-to-lightest supersymmetric\ud particle, this leads to a lower limit of 1650 GeV\ud on the mass of a degenerate octet of gluino states, independent\ud of the mass of the lighter bino-like neutralino.
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