The design and the construction of the scintillating fiber detector for the UA2 experiment

Alitti, J.; Baracat, A.; Bareyre, P.; Blumenfeld, H.; Bonamy, P.; Bourdinaud, M.; Crittenden, J.; Meyer, J.; Perrin, Patrick; Stirling, A.; Thevenin, J.C.; Zaccone, H.

doi:10.1109/23.34396

Cited by 114 publications

(170 citation statements)

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“…In particular, CDF can only exclude Z ′ → jj for M Z ′ roughly between 400 and 460 GeV [21], and then only for SM strength (or stronger) couplings. UA2 has a similar bound of M Z ′ > 260 GeV [22], but here again one requires SM strength couplings. Note that because of the small couplings that result from our perturbativity constraint, we tend to find that the production cross-section for the Z ′ at a hadron collider is suppressed by at least 40% compared to the SM Z cross-section.…”

Section: (I)mentioning

confidence: 99%

“…These fits are shown in Figure 5. UA2 has performed a Z ′ search in the dijet channels, excluding a Z ′ with 100% branching fraction to hadrons and SM strength interactions up to masses of 260 GeV [22]. However, given the value of g η = 0.4 and the U(1) η charges of the quarks, one can show that the production cross-section for this Z ′ is approximately 1/4 that of the Z, too small to be excluded at UA2.…”

Section: The η-Modelmentioning

confidence: 99%

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Leptophobic U(1)'s and theRb−Rcanomalies

1996

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In this paper, we investigate the possibility of explaining both the R b excess and the R c deficit reported by the LEP experiments through Z-Z ′ mixing effects. We have constructed a set of models consistent with a restrictive set of principles: unification of the Standard Model (SM) gauge couplings, vectorlike additional matter, and couplings which are both generation-independent and leptophobic. These models are anomaly-free, perturbative up to the GUT scale, and contain realistic mass spectra. Out of this class of models, we find three explicit realizations which fit the LEP data to a far better extent than the unmodified SM or MSSM and satisfy all other phenomenological constraints which we have investigated. One realization, the η-model coming from E 6 , is particularly attractive, arising naturally from geometrical compactifications of heterotic string theory. This conclusion depends crucially on the inclusion of a U (1) kinetic mixing term, whose value is correctly predicted by renormalization group running in the E 6 model given one discrete choice of spectra.

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Section: (I)mentioning

confidence: 99%

Section: The η-Modelmentioning

confidence: 99%

Leptophobic U(1)'s and theRb−Rcanomalies

1996

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“…However the earlier and less energetic experiments at UA2 can provide the strictest constraints [15][16][17][18][19], as also shown in Refs. [12,20].…”

Section: Introductionmentioning

confidence: 89%

Four jets as a probe of O(100 GeV) physics beyond standard model at hadron colliders

Wang

Zhu

2012

Phys. Rev. D

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O(100 GeV) physics beyond the standard model (BSM) could be overlooked provided that it is hidden in the untouched Higgs sector or jets. The top quark forward-backward asymmetry measurements and di-jet bump, which is observed in the associated production with charged lepton plus missing energy (supposed arising from W decay), may indicate the existence of a new color-octet axial-vector Z C with a mass about 145 GeV. Here Z C decays into two jets with a certain branching ratio. In this paper we investigated the possibility to discover Z C pair via analyzing the four jets as the final states, which are heavily polluted by huge QCD background. Our simulation showed that, however, both Tevatron and LHC have the excellent chance to discover Z C through analyzing the four jets events with accessible integrated luminosity and good control of QCD background. *

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“…At the present moment, the quantity s 2 W extracted from the data on deep inelastic νN-scattering is determined as 0.2260 (48) (the global fit of the data from the collaborations CDHS [30] and CHARM [31]), or 0.2218(59) (collaboration CCFR) [32]. The accuracy of these data is poorer than found by the direct measurement of the W boson mass m W and of the ratio m W /m Z by the collaborations UA2 in CERN [33] and CDF at Tevatron [34]. According to PDG [35], the fitted quantity is m W = 80.22 (26), which corresponds to s 2 W = 0.2264 (25).…”

Section: Deep Inelastic Neutrino Scattering By Nucleonsmentioning

confidence: 99%

Electroweak radiative corrections in Z-boson decays

et al. 1996

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Contents. Introduction.New theories, new symmetries, new particles, new phenomena. W and Z boson 'factories'. What's the point of studying loop corrections?.2. Brief history of electroweak radiative corrections.Muon and neutron decays. Main relations of electroweak theory.Traditional parametrization of corrections to the µ-decay and the running α.Deep inelastic neutrino scattering by nucleons.Other processes involving neutral currents.3. On optimal parametrization of the theory and the choice of the Born approximation.Traditional choice of the main parameters.Optimal choice of the main parameters. Z boson decays. Amplitudes and widths.Asymmetries.The Born approximation for hadronless observables.4. One-loop corrections to hadronless observables. Four types of Feynman diagrams. Asymptotic limit at m 2 t ≫ m 2 Z . The functions V m (t, h), V A (t, h) and V R (t, h). The corrections δV i (t, h). Accidental (?) compensation and the mass of the t-quark. How to calculate V i ? 'Five steps'. Hadronic decays of the Z boson.The leading quarks and hadrons. Decays to pairs of light quarks. Decays to a pair b b. 6. Comparison of theoretical results with experimental data. LEPTOP code. General fit. 7. Conclusions. Achievements. Problems. Prospects.

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The design and the construction of the scintillating fiber detector for the UA2 experiment

Cited by 114 publications

References 4 publications

Leptophobic U(1)'s and theRb−Rcanomalies

Leptophobic U(1)'s and theRb−Rcanomalies

Four jets as a probe of O(100 GeV) physics beyond standard model at hadron colliders

Electroweak radiative corrections in Z-boson decays

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