A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originat- ing from either contact interactions or large extra spatial dimensions. The LHC 2012 proton–proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb−1 at √s = 8 TeV. The dilepton invariant mass spec- trum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilep- ton forward-backward asymmetry. No significant deviations from the Standard Model expectation are observed. Lower limits are set on the llq q contact interaction scale between 15.4 TeV and 26.3 TeV , at the 95 % credibility level. For large extra spatial dimensions, lower limits are set on the string scale MS between 3.2 TeV to 5.0 TeV.
Search for contact interactions and large extra dimensions in the dilepton channel using proton–proton collisions at $$\sqrt{s}~=$$ s = 8 TeV with the ATLAS detector
CONTA, CLAUDIO;DONDERO, PAOLO;FRATERNALI, MARCO;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;
2014-01-01
Abstract
A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originat- ing from either contact interactions or large extra spatial dimensions. The LHC 2012 proton–proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb−1 at √s = 8 TeV. The dilepton invariant mass spec- trum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilep- ton forward-backward asymmetry. No significant deviations from the Standard Model expectation are observed. Lower limits are set on the llq q contact interaction scale between 15.4 TeV and 26.3 TeV , at the 95 % credibility level. For large extra spatial dimensions, lower limits are set on the string scale MS between 3.2 TeV to 5.0 TeV.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
