https://doi.org/10.1140/epjc/s10052-015-3313-0
Regular Article - Theoretical Physics
Constraints on
-channel leptoquark exchange from LHC contact interaction searches
1
IPNL, CNRS/IN2P3, 4 rue E. Fermi, 69622, Villeurbanne Cedex, France
2
Université Lyon 1, Villeurbanne, France
3
Université de Lyon, 69622, Lyon, France
* e-mail: s.davidson@ipnl.in2p3.fr
Received:
26
October
2014
Accepted:
12
February
2015
Published online:
27
February
2015
The -channel exchange of a first generation leptoquark could contribute to the cross section for
. The leptoquark is off-shell, so this process can be sensitive to leptoquarks beyond the mass reach of pair production searches at the LHC (currently
GeV). We attempt to analytically translate ATLAS bounds on
contact interactions to the various scalar leptoquarks, we but encounter two difficulties: the leptoquark momentum is not negligible, and the leptoquarks do not induce the contact interaction studied by ATLAS, so the interference with the standard model is different. If bounds were quoted on the functional dependence of the cross section on
, rather than on particular contact interaction models, these difficulties could be circumvented. We use the results of such a “form factor” fit to CMS plots to obtain bounds on the various leptoquarks’ quark–lepton coupling of order
TeV)
.
© SIF and Springer-Verlag Berlin Heidelberg, 2015