Study of Triple and Quartic Gauge Boson Couplings in E+e- Collisions Between 180 and 800 GeV
Author: Stefano Rosati
Publisher:
Published: 2002
Total Pages: 138
ISBN-13:
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Author: Stefano Rosati
Publisher:
Published: 2002
Total Pages: 138
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Published: 1996
Total Pages: 5
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DOWNLOAD EBOOKWe explore the capability of a 500 or 1000 GeV e e− linear collider to measure anomalous quartic gauge boson couplings. In the framework of a non-linear effective Lagrangian with a custodial SU(2) symmetry, there are only two next-to-leading order operators which contribute to quartic, but not to two- and three-gauge boson interactions. The limits on the coefficients of these operators from present and future e e− colliders are compared with those available from other sources.
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Published: 1999
Total Pages: 374
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DOWNLOAD EBOOKAuthor: Stephen T. Betts
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Published: 1999
Total Pages:
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DOWNLOAD EBOOKAuthor: Matthew Dobbs
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Published: 2002
Total Pages:
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Published: 2016
Total Pages:
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DOWNLOAD EBOOKAn analysis probing for the standard model production of three electroweak vector bosons, WV$\gamma$ with V = W or Z gauge boson, is presented. The W boson decays leptonically to an electron or muon, or their respective antiparticle, paired with the appropriate neutrino. The second boson V decays hadronically into two jets, and additionally a photon is required in the event. The data analyzed correspond to an integrated luminosity of 19.6~fb$^{-1}$ and 2.3~fb$^{-1}$ from proton-proton collisions at $\sqrt{s}$ = 8~TeV and 13~TeV, respectively, collected in 2012 and 2015 by the CMS detector at the Large Hadron Collider. The event selection criteria used in these analyses yields 322 and 46 observed events in data in 2012 and 2015, respectively, while the estimated background yield from theoretical predictions is 342.1~$\pm$~22.2 and 54.3~$\pm$~17.7. These observations are consistent with the standard model next-to-leading order QCD predictions. Given the limitation in statistics to measure the cross section for this production process, an upper limit of 3.4 times the standard model predictions is made at a 95\% confidence level for WV$\gamma$ with photon $p_{T}$ greater than 30~GeV and absolute pseudorapidity less than 1.44. Physics beyond the standard model, such as anomalous couplings between the gauge bosons at the quartic vertex, may lead to enhancement in the number of WV$\gamma$ events produced within high energy collisions. Such enhancements can be observed in kinematic distributions, particularly in the higher energy regions. No evidence of anomalous WW$\gamma\gamma$ and WWZ$\gamma$ quartic gauge boson couplings is found, while 95\% confidence level upper limits are obtained for various couplings.
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Published: 1999
Total Pages: 5
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DOWNLOAD EBOOKThe capability of the NLC run in the [gamma]e collision mode to probe the CP-conserving [gamma]WW and [gamma]ZZ anomalous couplings through the use of the polarization asymmetry is reviewed. When combined with other measurements, very strong constraints on both varieties of anomalous couplings can be obtained. We show that these bounds are complementary to those that can be extracted from data taken at the LHC.
Author: Mark Eugeen Theophila Dierckxsens
Publisher:
Published: 2004
Total Pages: 183
ISBN-13: 9789090175409
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Published: 1997
Total Pages: 8
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DOWNLOAD EBOOKThe D0 and CDF Collaborations measure boson pair production including W[gamma], WW, WZ, ZZ and Z[gamma] production in p{anti p} collisions at √s = 1800 GeV. New results, from direct measurements, are described including W[gamma], WW, and Z[gamma] production cross sections and limits on non-Standard Model triple gauge boson couplings. The limits on anomalous WW[gamma], WWZ, Z[gamma][gamma] and ZZ[gamma] couplings are the most restrictive available. Prospects for Run II are discussed.