M. Aaboud

Search for resonances in diphoton events at √s=13 TeV with the ATLAS detector

A bstractSearches for new resonances decaying into two photons in the ATLAS experiment at the CERN Large Hadron Collider are described. The analysis is based on proton-proton collision data corresponding to an integrated luminosity of 3.2 fb−1 at s=13

Search for top squarks in final states with one isolated lepton, jets, and missing transverse momentum in s =13 TeV pp collisions with the ATLAS detector

\sqrt{s}=13

Searches for heavy diboson resonances in pp collisions at √ s= 13 TeV with the ATLAS detector

TeV recorded in 2015. Two searches are performed, one targeted at a spin-2 particle of mass larger than 500 GeV, using Randall-Sundrum graviton states as a benchmark model, and one optimized for a spin-0 particle of mass larger than 200 GeV. Varying both the mass and the decay width, the most significant deviation from the background-only hypothesis is observed at a diphoton invariant mass around 750 GeV with local significances of 3.8 and 3.9 standard deviations in the searches optimized for a spin-2 and spin-0 particle, respectively. The global significances are estimated to be 2.1 standard deviations for both analyses. The consistency between the data collected at 13 TeV and 8 TeV is also evaluated. Limits on the production cross section times branching ratio to two photons for the two resonance types are reported.

Measurement of the

A measurement of the total pp cross section at the LHC at View the MathML sources=8 TeV is presented. An integrated luminosity of 500 μb−1500 μb−1 was accumulated in a special run with high-β⋆β⋆ beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the −t range from 0.014 GeV20.014 GeV2 to 0.1 GeV20.1 GeV2 to extrapolate t→0t→0, the total cross section, σtot(pp→X)σtot(pp→X), is measured via the optical theorem to be View the MathML sourceσtot(pp→X)=96.07±0.18(stat.)±0.85(exp.)±0.31(extr.)mb, where the first error is statistical, the second accounts for all experimental systematic uncertainties and the last is related to uncertainties in the extrapolation t→0t→0. In addition, the slope of the exponential function describing the elastic cross section at small t is determined to be View the MathML sourceB=19.74±0.05(stat.)±0.23(syst.)GeV−2.

ZZ

http://sro.sussex.ac.uk Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Potter, C T, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The Atlas Collaboration, et al (2016) Search for top squarks in final states with one isolated lepton, jets, and missing transverse momentum in s√=13 TeV pp collisions with the ATLAS detector. Physical Review D, 94. 052009. ISSN 1550-7998

production cross section in

A search is conducted for both resonant and non-resonant hig h-mass new phenomena in dielectron and dimuon final states. The search uses 3.2 fb −1 o proton–proton collision data, collected at √ s= 13 TeV by the ATLAS experiment at the LHC in 2015. The dilepton invariant mass is used as the discriminating variable. No significa t deviation from the Standard Model prediction is observed; therefore limits are set on th e signal model parameters of interest at 95% credibility level. Upper limits are set on the c ross-section times branching ratio for resonances decaying to dileptons, and the limits are con verted into lower limits on the resonance mass, ranging between 2.74 TeV and 3.36 TeV, depen ing on the model. Lower limits on thellqq contact interaction scale are set between 16.7 TeV and 25.2 T eV, also depending on the model. c

pp

A bstractSearches for new heavy resonances decaying to WW, WZ, and ZZ bosons are presented, using a data sample corresponding to 3.2 fb−1 of pp collisions at s=13