Limits on Anomalous Trilinear Gauge Couplings inZγEvents frompp¯Collisions ats=1

Abstract

Using Zγ candidate events collected by the CDF detector at the Tevatron Collider, we search for potential anomalous (non-standard-model) couplings between the Z boson and the photon. Zγ couplings vanish at tree level and are heavily suppressed at higher orders; hence any evidence of couplings indicates new physics. Measurements are performed using data corresponding to an integrated luminosity of 4.9 fb(-1) in the Z→νν¯ decay channel and 5.1 fb(-1) in the Z→l(+)l(-) (l=μ, e) decay channels. The combination of these measurements provides the most stringent limits to date on Zγ trilinear gauge couplings. Using an energy scale of Λ=1.5 TeV to allow for a direct comparison with previous measurements, we find limits on the CP-conserving parameters that describe Zγ couplings to be |h(3)(γ,Z)|<0.022 and |h(4)(γ,Z)|<0.0009. These results are consistent with standard model predictions.

Wγ and Zγ production at the LHC in NNLO QCD

“…In preparation. 4 More precisely, while the behavior of dσ CT (N)NLO as qT → 0 is dictated by the singular structure of dσ F+jet (N)LO , its non-divergent part in the same limit is to some extent arbitrary, and its choice determines the explicit form of H …”

“…At hadron colliders, studies of V γ final states have been first carried out at the Tevatron [4][5][6], and they were used to set more stringent limits on anomalous couplings. The high-energy proton-proton collisions at the LHC allow us to explore the production of V γ (V = W ± , Z) pairs in a new energy domain.…”

Evidence ofWγγProduction inppCollisions ats=8 TeVAad1, Abbott2, Abdallah3 et al. 2015Phys. Rev. Lett.Self Cite390342View full textAdd to dashboardCite

“…Limits on AQGC parameters are set in the exclusive phase space with a diphoton mass larger than 300 GeV. Total and differential cross sections for the diboson production processes WW, WZ, ZZ, Wγ, and Zγ have been reported previously by the ATLAS [2][3][4][5], CMS [6][7][8], D0 [9][10][11], and CDF [12][13][14] Collaborations, including limits on anomalous triple gauge boson couplings. Limits have been set on AQGCs by ATLAS [15], CMS [16,17], the LEP experiments [18][19][20][21], and D0 [22].…”

ZZγandZγγanomalous couplings inγpcollision at the LHC

“…intervals for anomalous ZZ and Z couplings have been provided by ATLAS [6] for an integrated luminosity (L int ) of 1:02 fb À1 and à ¼ 1, CMS [7] for L int ¼ 36 pb À1 and à ¼ 1, D0 [8] for L int ¼ 7:2 fb À1 and à ¼ 1, CDF [9] for L int ¼ 5:1 fb À1 and à ¼ 1:5 TeV and LEP [10] obtained from Z events which are given in Table I. Probing on ZZ and Z couplings has been studied in the pp [2,[11][12][13], e þ e À [14][15][16][17][18][19][20], and ep [21,22] colliders.…”