Probing the weak-boson sector inZγproduction at hadron colliders

Abstract

A detailed analysis of Z y production at hadron colliders is presented for general Z Z y and Z y y couplings. Deviations from the standard model gauge theory structure can be parametrized in terms of four Z Z y and four Z y y form factors. The high-energy behavior of these form factors is severely restricted by unitarity. Prospects for testing the self-interactions of Z bosons and photons at the Fermilab Tevatron, the CERN Large Hadron Collider and the Superconducting Super Collider are explored. Sensitivity limits for anomalous Z Z y and Z y y couplings are derived and compared to bounds from low-energy data and e + e -collider experiments. PACS numberk): 13.85.Qk, 12.15.Cc, 13.38. -tc

Search for new physics in energetic single photon production in e+e− annihilation at the Z resonance

“…This is illustrated by the dotted histogram in Figure 2 where we have taken just one of the form factors describing the Z Z v ertex to be nonzero. We have followed [6] in adopting the parameterization h Z i = h Z i0 =(1 + s= 2 Z ) n i with n 1 = n 3 = 3 and n 2 = n 4 = 4 ; Z = 500 GeV was used for the calculation shown in Figure 2.…”

Probing neutral gauge boson self-interactions in ZZ production at hadron colliders

“…In order to avoid unphysical results that would violate unitarity, thê s dependence thus has to be taken into account. To parameterize theŝ dependence of the form factor, we will use a generalized dipole form factor [17],…”

New physics in e + e − → Zγ at the ILC with polarized beams: explorations beyond conventional anomalous triple gauge boson couplings

“…These anomalous couplings have been extensively studied in the literature in the context of different colliders 1 [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Moreover there has been a lot of work in the literature [8,10,13,17,23] where effective Lagrangians or effective momentum-space vertices and the associated form factors in neutral gauge boson production have been discussed.…”

“…Therefore any deviation from the tree-level SM predictions will signal the presence of beyond-SM (BSM) physics. We will first return to the anomalous couplings for this process that were introduced some decades ago [5,8,10]. In particular, these authors have provided a standard basis, in terms of 8 couplings, denoted…”

“…Thus a model independent classification of terms has been a rich and highly developed field, see refs. [5][6][7][8][9][10]. The work of Hagiwara et al [5] will be used by us as a standard touchstone in the considerations associated with anomalous couplings in the neutral-boson sector.…”