Article (Scientific journals)
Missing energy and jets for supersymmetry searches
Bern, Zvi; Diana, Giovanni; Dixon, L. J. et al.
2013In Physical Review. D, 87 (3), p. 034026
Peer reviewed
 

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Keywords :
Missing energy; supersymmetry; LHC physics
Abstract :
[en] We extend our investigation of backgrounds to new physics signals, following CMS’s data-driven search for supersymmetry at the LHC. The aim is to use different sets of cuts in γ+3-jet production to predict the irreducible Z+3-jet background (with the Z boson decaying to neutrinos) to searches with E̸T+3-jet signal topologies. We compute ratios of Z+3-jet to γ+3-jet production cross sections and kinematic distributions at next-to-leading order (NLO) in αs. We compare these ratios with those obtained using a parton shower matched to leading-order matrix elements (ME+PS). This study extends our previous work [Bern et al., Phys. Rev. D 84 114002 (2011)] on the Z+2-jet to γ+2-jet ratio. We find excellent agreement with the ratio determined from the earlier NLO results involving two instead of three jets, and agreement to within 10% between the NLO and ME+PS results for the ratios. We also examine the possibility of large QCD logarithms in these processes. Ratios of Z+n-jet to γ+n-jet cross sections are plausibly less sensitive to such corrections than the cross sections themselves. Their effect on estimates of Z+3-jet to γ+3-jet ratios can be assessed experimentally by measuring the γ+3-jet to γ+2-jet production ratio in search regions. We partially address the question of potentially large electroweak logarithms by computing the real-emission part of the electroweak corrections to the ratio using ME+PS and find that it is 1% or less. Our estimate of the remaining theoretical uncertainties in the Z to γ ratio is in agreement with our earlier study.
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.;  Stanford University > SLAC National Accelerator Laboratory
Cordero, F. Febres;  Universidad Simon Bolıvar > Departamento de Fısica
Höche, S.;  Stanford University > SLAC National Accelerator Laboratory
Ita, H.;  UCLA > Department of Physics and Astronomy
Kosower, D. A.;  Commissariat à l'Energie Atomique (Saclay) - CEA > 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 :
Missing energy and jets for supersymmetry searches
Publication date :
2013
Journal title :
Physical Review. D
Publisher :
American Physical Society
Volume :
87
Issue :
3
Pages :
034026
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 21 October 2013

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