Reference : Driving missing data at next-to-leading order
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/9076
Driving missing data at next-to-leading order
English
Bern, Zvi [University of California, Los Angeles - UCLA > Department of Physics and Astronomy]
Diana, Giovanni mailto [CEA–Saclay > Institut de Physique Theorique]
Dixon, L. J. [CERN > Theory Division]
Cordero, F. Febres [Universidad Simon Bolıvar > Departamento de Fısica]
Höche, S. [Stanford University > SLAC National Accelerator Laboratory]
Ita, H. [University of California, Los Angeles - UCLA > Department of Physics and Astronomy]
Kosower, D. A. [CEA–Saclay > Institut de physique theorique]
Maitre, D. [CERN, > Theory division]
Ozeren, K. J. [University of California, Los Angeles - UCLA > Department of Physics and Astronomy]
2011
Physical Review D
APS
84
11
114002
Yes
International
[en] The prediction of backgrounds to new-physics signals in topologies with large missing transverse energy and jets is important to new-physics searches at the LHC. Following a CMS study, we investigate theoretical issues in using measurements of γ+2-jet production to predict the irreducible background to searches for missing energy plus two jets that originates from Z+2-jet production where the Z boson decays to neutrinos. We compute ratios of γ+2-jet to Z+2-jet production cross sections and kinematic distributions at next-to-leading order in αs, as well as using a parton shower matched to leading-order matrix elements. The former ratios rely on the first next-to-leading-order calculation of γ+2-jet production at a hadron collider. We find that the ratios obtained in the two approximations are quite similar, making γ+2-jet production a theoretically reliable estimator for the missing energy plus two jets background. We employ a Frixione-style photon isolation, but we also show that for isolated prompt-photon production at high transverse momentum the difference between this criterion and the standard-cone isolation used by CMS is small.
http://hdl.handle.net/10993/9076
10.1103/PhysRevD.84.114002
http://prd.aps.org/abstract/PRD/v84/i11/e114002

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