2000
DOI: 10.1103/physrevd.62.073013
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New and standard physics contributions to anomalous Z and γ self-couplings

Abstract: We examine the Standard and the New Physics (NP) contributions to the ZZZ, ZZγ and Zγγ neutral gauge couplings. At the one-loop level, if we assume that there is no CP violation contained in NP beyond the Standard Model one, we find that only CP conserving neutral gauge couplings are generated, either from the standard quarks and leptons, or from possible New Physics (NP) fermions. Bosonic one-loop diagrams never contribute to these couplings, while the aforementioned fermionic contributions satisfyWe also stu… Show more

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Cited by 75 publications
(88 citation statements)
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“…In this specific case the exponent n = 3 is chosen. Studying the sensitivity at 8 TeV, ATLAS (Aaboud et al, 2016e) finds that a unitarization with a dipole form factor is no longer needed as the aTGC limits approach more and more the SM expectation (Gounaris et al, 2000). …”
Section: Zzγ and Zzz Limitsmentioning
confidence: 99%
“…In this specific case the exponent n = 3 is chosen. Studying the sensitivity at 8 TeV, ATLAS (Aaboud et al, 2016e) finds that a unitarization with a dipole form factor is no longer needed as the aTGC limits approach more and more the SM expectation (Gounaris et al, 2000). …”
Section: Zzγ and Zzz Limitsmentioning
confidence: 99%
“…On the theoretical side, it is possible to generate some of these anomalous tensorial structures within the framework of a renormalizable theory at higher loop orders, for example, through a fermion triangle diagram in the SM. Loop generated anomalous couplings have been studied for the Minimal Supersymmetric SM (MSSM) [27,28] and Little Higgs model [29]. Beside this, a non-commutative extension of the SM (NCSM) [30,31] can also provide an anomalous coupling structure in the neutral sector with a possibility of a trilinear γ γ γ coupling as well [30].…”
Section: Introductionmentioning
confidence: 99%
“…C.1). In those cases, the effective Z W + W − , Z ZZ vertices contain the terms 20) where k 1 , k 2 are the four-momenta of the outgoing bosons (see also [516,517]). These terms lead to a = 0 in the cross section, making the W + W − and ZZ channels relevant despite of the loop suppression.…”
Section: Results For the Branching Ratiosmentioning
confidence: 99%