Measurement of trilinear gauge boson couplings fromWW+WZ→lνjjevents inpp¯collisions

Abstract

We present a direct measurement of trilinear gauge boson couplings at WW and ZWW vertices in WW and WZ events produced in p " p collisions at ffiffi ffi s p ¼ 1:96 TeV. We consider events with one electron or muon, missing transverse energy, and at least two jets. The data were collected using the D0 detector and correspond to 1:1 fb À1 of integrated luminosity. Considering two different relations between the couplings at the WW and ZWW vertices, we measure these couplings at 68% C.L. to be ¼ 1:07 þ0:26 À0:29 , ¼ 0:00 þ0:06 À0:06 , and g Z 1 ¼ 1:04 þ0:09 À0:09 in a scenario respecting SUð2Þ L Uð1Þ Y gauge symmetry and ¼ 1:04 þ0:11 À0:11 and ¼ 0:00 þ0:06 À0:06 in an ''equal couplings'' scenario.

Semileptonic decays of the Higgs boson at the Tevatron

“…As in all other cases, we correct the total inclusive cross section for NLO effects by multiplying with global K-factors, which for both electroweak and tt production are larger than 1. Tevatron diboson searches like [85,86] measure cross sections in good agreement with the prediction given by Campbell and Ellis (16.1 ± 0.9 pb for W W+W Z). From their work [87] (Table III) we infer an NLO-to-LO K-factor ranging from 1.30 to 1.35.…”

Probing new physics viapp→W+W−→lνjjat the CERN LHC

“…lll with 4:1 fb À1 of data. As for the WW channel, which is of our interest, D0 gives À0:10 < Z < 0:11 through ljj analysis with 1:1 fb À1 of data [32], and À0:14 < Z < 0:18 through ll analysis with 1 fb À1 of data [33]. The ATLAS Technical Digest Report [34] also gave an estimate on the ability of the 14 TeV LHC, which can reach À0:028 < Z < 0:024 with 1 fb À1 of data by fitting M T ðWZÞ in the WZ measurement, and À0:108 < Z < 0:111 from the WW !…”

“…The semileptonic channel, although it suffers from larger QCD background compared with the pure leptonic channel, can benefit from larger production rates and the reconstructable four-body mass M ljj , which can then be exploited for shape fitting in data analysis to control the background systematics via an extrapolation method from the control to signal region. Note the semileptonic ljj channel has already been studied extensively both in MC and experimental analysis on Higgs search [36][37][38] and triple gauge boson anomalous coupling [32], etc., which shows benefits to increase the search sensitivity either alone or by combining with other channels. This paper is organized as follows.…”

Search for ResonantWWandWZProduction inpp¯Collisions atAbazov1, Abbott2, Acharya3 et al. 2011Phys. Rev. Lett.Self Cite

“…WW resonance with mass less than 607 GeV [6,7]. Indirect searches for new physics in the WW and WZ diboson systems through measurements of the triple gauge couplings also show no deviation from the SM predictions [8][9][10]. The D0 Collaboration also excludes MðW 0 Þ < 1:00 TeV [11], when assuming the W 0 boson decays as in the SM, and MðGÞ < 1:05 TeV [12], when assuming G decays into or ee.…”