Light stops emerging in WW cross section measurements?

Abstract

Recent ATLAS and CMS measurements show a slight excess in the WW cross section measurement. While still consistent with the Standard Model within 1-2 sigma, the excess could be also a first hint of physics beyond the Standard Model. We argue that this effect could be attributed to the production of scalar top quarks within supersymmetric models. The stops of mstop_1 ~ 200 GeV has the right pair-production cross section and under some assumptions can significantly contribute to the final state of two leptons and missing energy. We scan this region of parameter space to identify stop mass range preferred by the WW cross section measurements. Taking one sample benchmark point we show that it can be consistent with low energy observables and Higgs sector measurements and propose a method to distinguish supersymmetric signal from the Standard Model contribution.

16 pages, 5 figures, minor revision, discussion of asymmetry expanded, to appear in JHEP

References in corpus (11)

• Herwig++ Physics and Manual
• Vector boson pair production at the LHC
• SuperIso v3.0: A program for calculating flavor physics observables in 2HDM and supersymmetry
• First evidence for the decay Bs -> mu+ mu-
• SuperIso: A program for calculating the isospin asymmetry of B -> K* gamma in the MSSM
• Measurement of ZZ production in pp collisions at sqrt(s)=7 TeV and limits on anomalous ZZZ and ZZgamma couplings with the ATLAS detector
• The light stop window
• \sqrt{s}_min: a global inclusive variable for determining the mass scale of new physics in events with missing energy at hadron colliders
• Measurement of the ZZ production cross section and search for anomalous couplings in 2l2l' final states in pp collisions at sqrt(s) = 7 TeV
• Spin Analysis of Supersymmetric Particles
• Simulation of Beyond Standard Model Physics in Herwig++

Cited by in corpus (17)

• ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider
• Multi-Boson Interactions at the LHC
• An Explanation of the WW Excess at the LHC by Jet-Veto Resummation
• Closing the stop gap
• Transverse momentum resummation effects in W^+W^- measurements
• Natural SUSY in Plain Sight
• Spying an invisible Higgs
• What is a Natural SUSY scenario?
• `Stop' that ambulance! New physics at the LHC?
• Resummation of Jet Veto Logarithms at partial N${}^3$LL + NNLO for $W^{+}{W}^{-}$ Production at the LHC
• Contributions of flavor violating couplings of a Higgs boson to $pp\to WW$
• 1-loop SQCD corrections to the decay of top-squarks to charm and neutralino in the generic MSSM
• Tagging a mono-top signature in Natural SUSY
• Mono-top Signature from Supersymmetric $t\bar{t}H$ Channel
• Precision diboson measurements and the interplay of pT and jet-veto resummations
• Pure leptonic proposal to $W^{+}{W}^{-}$ excess and neutrino mass generation
• Mono-top Signature from Fermionic Top-partner