Probing New Physics via pp-> W+W- -> lvjj at the CERN LHC

TL;DR

This paper investigates the potential of the 7TeV LHC to detect or constrain new physics models like Large Extra Dimensions and anomalous triple gauge couplings through the semi-leptonic WW production channel, using kinematic tail analyses.

Contribution

It introduces a detailed analysis method for probing new physics via the lvjj channel at the LHC, including background considerations and detector effects, with sensitivity estimates.

Findings

LHC at 7TeV can set 95% CL limits on Large Extra Dimensions up to 1.5 TeV.

Sensitivity to WWZ anomalous couplings down to ||~0.1.

Potential for discovery or exclusion with 5fb data.

Abstract

TeV scale new Physics, e.g., Large Extra Dimensions or Models with anomalous triple vector boson couplings, can lead to excesses in various kinematic regions on the semi-leptonic productions of pp -> WW -> lvjj at the CERN LHC, which, although suffers from large QCD background compared with the pure leptonic channel, can benefit from larger production rates and the reconstructable 4-body mass Mlvjj. We study the search sensitivity through the lvjj channel at the 7TeV LHC on relevant new physics, via probing the hard tails on the reconstructed Mlvjj and the transverse momentum of W-boson (PTW), taking into account main backgrounds and including the parton shower and detector simulation effects. Our results show that with integrated luminosity of 5fb-1, the LHC can already discovery or exclude a large parameter region of the new physics, e.g., 95% CL. limit can be set on the Large Extra Dimensions with a cut-off scale up to 1.5 TeV, and the WWZ anomalous coupling down to, e.g. |\lambda_Z|~0.1. Brief results are also given for the 8TeV LHC.