Article (Scientific journals)
Driving missing data at next-to-leading order
Bern, Zvi; Diana, Giovanni; Dixon, L. J. et al.
2011In Physical Review. D, 84 (11), p. 114002
Peer reviewed
 

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Abstract :
[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.
Disciplines :
Physics
Author, co-author :
Bern, Zvi;  University of California, Los Angeles - UCLA > Department of Physics and Astronomy
Diana, Giovanni ;  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
Language :
English
Title :
Driving missing data at next-to-leading order
Publication date :
2011
Journal title :
Physical Review. D
Publisher :
APS
Volume :
84
Issue :
11
Pages :
114002
Peer reviewed :
Peer reviewed
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