Measurement of triple gauge-boson couplings at 172 GeV

Barate, R.; Buskulic, D.; Décamp, D.; Ghez, Philippe; Goy, C.; Jézéquel, S.; Lees, J. P.; Lucotte, A.; Minard, M.-N.; Nief, J.Y.; Pietrzyk, B.; Boix, G.; Casado, M. P.; Chmeissani, M.; Crespo, J.M.; Delfino, M.; Fernández, E.; Fernández-Bosman, M.; Garrido, Ll.; Graugés, E.; Rozas, A. Juste; Martı́nez, M.; Merino, G.; Miquel, R.; Mir, L. M.; Morawitz, P.; Park, I.C.; Pascual, Á.; Perlas, J. A.; Riu, I.; Sanchez, F. J. Munoz; Colaleo, A.; Creanza, D.; Palma, M. De; Gelao, G.; Iaselli, G.; Mäggi, G.; Maggi, M.; Nuzzo, S.; Ranieri, A.; Raso, G.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Tricomi, A.; Zito, G.; Huang, X. T.; Lin, J.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Alemany, R.; Becker, U.; Bright-Thomas, P.; Casper, D.; Cattaneo, M.; Cerutti, F.; Ciulli, V.; Dissertori, G.; Drevermann, H.; Forty, R.; Frank, M.; Gianotti, F.; Hagelberg, R.; Hansen, J. B.; Harvey, J.; Janot, P.; Jost, B.; Lehraus, I.; Mató, P.; Minten, A.; Moneta, L.; Pacheco, A.; Pusztaszeri, J. F.; Ranjard, F.; Rolandi, G.; Rousseau, D.; Schlatter, D.; Schmitt, M.; Schneider, O.; Tejessy, W.; Teubert, F.; Tomalin, I. R.; Vreeswijk, M.; Wachsmuth, H.; Wagner, A.; Ajaltouni, Z.; Badaud, F.; Chazelle, G.; Deschamps, O.; Falvard, A.; Ferdi, C.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J. C.; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Rosnet, P.; Fearnley, T.; Hansen, J. D.; Hansen, J. R.; Hansen, P. H.; Nilsson, B.S.; Rensch, B.; Wäänänen, A.; Daskalakis, G.; Kyriakis, A.; Markou, C.; Simopoulou, E.; Vayaki, A.; Blondel, A.; Brient, J. C.; Machefert, F.; Rougé, A.; Rumpf, M.; Valassi, A.; Videau, H.; Boccali, T.; Focardi, E.; Parrini, G.; Zachariadou, K.; Cavanaugh, R.; Corden, M.; Georgiopoulos, C.; Huehn, T.; Jaffe, D. E.; Antonelli, A.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Chiarella, V.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, F.; Passalacqua, L.; Pepe-Altarelli, M.; Curtis, L.; Dorris, S. J.; Halley, A.W.; Lynch, J.G.; Negus, P.; O’Shea, V.; Raine, C.; Scarr, J. M.; Smith, K. M.; Teixeira-Dias, P.; Thompson, A. S.; Thomson, E.; Thomson, F.; Ward, J. J.; Buchmüller, O.; Dhamotharan, S.; Geweniger, C.; Graefe, G.; Hanke, P.; Hansper, G.; Hepp, V.; Kluge, E. E.; Putzer, A.; Sommer, J.; Tittel, K.; Werner, S.; Wunsch, M.; Beuselinck, R.; Binnie, D. M.; Cameron, W.; Dornan, P. J.; Girone, M.; Goodsir, S.; Martin, E. B.; Marinelli, N.; Moutoussi, A.; Nash, J.; Sedgbeer, J. K.; Spagnolo, P.; Williams, M.D.; Ghete, V. M.; Girtler, P.; Kneringer, E.; Kühn, D.; Rudolph, G.; Betteridge, A. P.; Bowdery, C. K.; Buck, P.G.; Colrain, P.; Crawford, G.; Finch, A. J.; Foster, F.; Hughes, G.; Jones, R. W. L.; Whelan, E. P.; Williams, M.I.; Giehl, I.; Hoffmann, C.; Jakobs, K.; Kleinknecht, K.; Quast, G.; Renk, B.; Rohne, E.; Sander, H. G.; Gemmeren, P. van; Zeitnitz, C.; Aubert, J.J.; Benchouk, C.; Bonissent, A.; Bujosa, G.; Carr, J.; Coyle, P.; Ealet, A.; Fouchez, D.; Leroy, O.; Motsch, F.; Payre, P.; Talby, M.; Sadouki, A.; Thulasidas, M.; Tilquin, A.; Trabelsi, K.; Aleppo, M.; Antonelli, M.; Ragusa, F.; Berlich, R.; Blum, W.; Büscher, V.; Dietl, H.; Ganis, G.; Gotzhein, C.; Kroha, H.; Lütjens, G.; Lütz, G.; Mannert, C.; Männer, W.; Moser, H. G.; Richter, R.; Rosado-Schlosser, A.; Schael, S.; Settles, R.; Seywerd, H.; Stenzel, H.; Wiedenmann, W.; Wolf, G.; Boucrot, J.; Callot, O.; Chen, S.; Davier, M.; Duflot, L.; Grivaz, J.-F.; Heusse, P.; Höcker, A.; Jachołkowska, A.; Kado, M.; Kim, D.W.; Diberder, F. Le; Lefrançois, J.; Lutz, A. M.; Schune, M. H.; Serin, L.; Tournefier, E.; Veillet, J. J.; Videau, I.; Zerwas, D.; Azzurri, P.; Bagliesi, G.; Bettarini, S.; Bozzi, C.; Calderini, G.; Dell’Orso, R.; Fantechi, R.; Ferrante, I.; Giassi, A.; Gregorio, A.; Ligabue, F.; Lusiani, A.; Marrocchesi, P. S.; Messineo, A.; Palla, F.; Rizzo, G.; Sanguinetti, G.; Sciabà, A.; Sguazzoni, G.; Steinberger, J.; Тенчини, Р.; Vannini, C.; Venturi, A.; Verdini, P. G.; Blair, G.A.; Bryant, L. M.; Chambers, J.T.; Coles, Jane; Green, M.G.; Medcalf, T.; Perrodo, P.; Strong, J. A.; Wimmersperg-Toeller, J. H. von; Botterill, D.; Clifft, R. W.; Edgecock, T.R.; Haywood, S. J.; Maley, P.; Norton, P. R.; Thompson, J.C.; Wright, A.E.; Bloch-Devaux, B.; Colas, P.; Fabbro, B.; Faı̈f, G.; Lançon, E.; Lemaire, M. C.; Locci, E.; Pérez, P.; Przysiezniak, H.; Rander, J.; Renardy, J. F.; Rosowsky, A.; Roussarie, A.; Trabelsi, A.; Vallage, B.; Black, S.N.; Dann, J.H.; Kim, H.Y.; Konstantinidis, N.; Litke, A. M.; McNeil, M.A.; Taylor, G. N.; Booth, C.N.; Brew, C.; Cartwright, S.; Combley, F.; Kelly, M.S.; Lehto, M.; Reeve, J.; Thompson, L.F.; Affholderbach, K.; Böhrer, A.; Brandt, Siegmund; Cowan, G.; Foss, J. F.; Grupen, C.; Smolík, L.; Stephan, F.; Apollonio, M.; Bosisio, L.; Marina, R. Della; Giannini, G.; Gobbo, B.; Musolino, G.; Pütz, J.; Rothberg, J.; Wasserbaech, S.; Williams, R.W.; Armstrong, S.R.; Charles, E.; Elmer, P.; Ferguson, D.P.S.; Gao, Y.; González, S.; Greening, T.C.; Hayes, O.J.; Hu, Hongbo; Jin, S.; McNamara, P.A.; Nachtman, J. M.; Nielsen, J.; Orejudos, W.; Pan, Y.; Saadi, Y.; Scott, I.; Walsh, J.; Wu, S. L.; Wu, X.; Yamartino, J. M.; Zobernig, G.

doi:10.1016/s0370-2693(98)00061-6

Cited by 31 publications

(7 citation statements)

References 25 publications

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“…They include and supersede our previously published results on TGCs [8][9][10]. Other experiments at LEP and at hadron colliders have also reported results on TGCs [11][12][13][14]. …”

supporting

confidence: 79%

Measurement of triple-gauge-boson couplings of the W boson at LEP

Acciarri¹,

Achard²,

Adriani³

et al. 1999

Physics Letters B

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We report on measurements of the triple-gauge-boson couplings of the W boson in e + e − collisions with the L3 detector at LEP. W-pair, single-W and single-photon events are analysed in a data sample corresponding to a total luminosity of 76.7 pb −1 collected at centre-of-mass energies between 161 GeV and 183 GeV. CP-conserving as well as both C-and P-conserving triple-gauge-boson couplings are determined. The results, in good agreement with the Standard-Model expectations, confirm the existence of the self coupling among the electroweak gauge bosons and constrain its structure.Submitted to Phys. Lett. B IntroductionDuring the 1996 and 1997 data taking periods, the centre-of-mass energy, √ To lowest order within the Standard Model [2] (SM), three Feynman diagrams contribute to W-pair production, the s-channel γ and Z-boson exchange and the t-channel ν e exchange. The s-channel diagrams contain the γWW and ZWW vertices. At present centre-of-mass energies, single-W production is sensitive to the electromagnetic gauge couplings only. The γWW vertex appears in one of the contributing t-channel Feynman diagrams in Weν production, and dominates the corresponding diagram containing the ZWW vertex. Radiation of a photon from the t-channel exchanged W boson in the process e + e − → ν eνe becomes significant for centre-of-mass energies far above the Z pole and involves as well the γWW vertex.In general the vertices γWW and ZWW are parametrised in terms of seven triple-gaugeboson couplings (TGCs) each [3], too many to be measured simultaneously. Regarding only CP-conserving couplings and assuming electromagnetic gauge invariance, six TGCs remain, which are g [4][5][6][7], where ∆ denotes the deviation of the TGC from its SM value and θ w is the weak mixing angle. When these constraints are applied, the remaining three TGCs, g Z 1 , κ γ and λ γ , correspond to the operators in a linear realization of a gauge-invariant effective Lagrangian that do not affect the gauge-boson propagators at tree level [7]. The TGCs are related to the three α couplings used in our previous publications [8, 9]. 1)Alternatively, it is interesting to study the TGCs g Z 1 , κ γ and κ Z , imposing λ γ = λ Z = 0. This set corresponds to the operators of lowest dimensionality in the non-linear realization of a gauge-invariant effective Lagrangian, necessary in the absence of a light Higgs boson [7].In this article we report on measurements of TGCs of the W boson in data samples corresponding to total luminosities of 10.9 pb −1 , 10.3 pb −1 and 55.5 pb −1 collected at centre-of-mass energies of 161 GeV, 172 GeV and 183 GeV, respectively. The results on TGCs are based on analyses of multi-differential cross sections in W-pair, single-W and single-photon production. They include and supersede our previously published results on TGCs [8][9][10]. Other experiments at LEP and at hadron colliders have also reported results on TGCs [11][12][13][14]. Event Selection and ReconstructionThe event selections used here are identical to those published earl...

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“…They include and supersede our previously published results on TGCs [8][9][10]. Other experiments at LEP and at hadron colliders have also reported results on TGCs [11][12][13][14]. …”

supporting

confidence: 79%

Measurement of triple-gauge-boson couplings of the W boson at LEP

Acciarri¹,

Achard²,

Adriani³

et al. 1999

Physics Letters B

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“…The triple gauge coupling data lead to the following 95% C.L. constraints (in units of TeV −2 ) [6,15,47,48]:…”

Section: B Constraints On Fn From the Existing Experiments And The Umentioning

confidence: 99%

Testing anomalous gauge couplings of the Higgs boson via weak-boson scatterings at the CERN LHC

Zhang

Kuang

et al. 2003

Phys. Rev. D

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We propose a sensitive way to test the anomalous HV V couplings (V = W ± , Z 0 ) of the Higgs boson (H), which can arise from either the dimension-3 effective operator in a nonlinearly realized Higgs sector or the dimension-6 effective operators in a linearly realized Higgs sector, via studying the V V scattering processes at the CERN LHC. The gold-plated pure leptonic decay modes of the final state weak bosons in the processes pp → V V jj are studied. For comparison, we also analyze the constraints from the precision electroweak data, the expected precision of the measurements of the Higgs boson production rate, decay width and branching ratios at the Fermilab Tevatron Run-2 and the CERN LHC, and the requirement of unitarity of the S matrix. We show that, with an integrated luminosity of 300 fb −1 and sufficient kinematical cuts for suppressing the backgrounds, studying the process pp → W + W + jj → ℓ + νℓ + νjj can probe the anomalous HW W couplings at a few tens of percent level for the nonlinearly realized Higgs sector, and at the level of 0.01 − 0.08 TeV −1 for the linearly realized effective Lagrangian.

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“…The Monte Carlo is generated with the Standard Model set of couplings and the effect of anomalous couplings is obtained through event-by-event reweighting. A somehow similar method is the one used by ALEPH [9,10] in their measurement of real and imaginary part of CP violating couplings. An unbinned maximum likelihood fit is performed, based on probability density functions obtained convoluting the lowest order narrow-width differential cross section with detector resolution and efficiency and initial state radiation function.…”

Section: Fit Of the Multidimensional Distribution Of Phase-space Anglesmentioning

confidence: 99%

Measurement of charged current triple gauge boson couplings

Villa¹

2001

Proceedings of International Europhysics Conference on High Energy Physics — PoS(hep2001)

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Abstract:We review the status of measurements of charged current Triple Gauge Couplings based on the study of single and double gauge boson production at LEP. Different methods of extraction are presented, involving the W-pair, single W and single photon channels. The related topics of spin density matrix and W polarisation determination are also described.The non-Abelian gauge structure of the electroweak theory implies the existence of Triple Gauge Couplings (TGC) of the type WWZ and WWγ, between the two charged bosons W + and W − and one of the neutral bosons Z or γ. The measurement of the strength of such couplings is not only a way of directly testing the gauge structure of the theory, but also a powerful tool for setting limits on possible deviations from it.For this purpose the most general Lorentz invariant Lagrangian of the type WWV (where V can be either Z or γ) is written, making use of the gauge boson fields and of their covariant derivatives [1]. In this way one finds that 14 parameters would in general be necessary to parametrise such interactions:A reduction of the set of couplings being measured is usually obtained by assuming the conservation of well established symmetries also in the case of anomalous (i.e. different from the Standard Model ones) couplings.The assumption of electromagnetic gauge invariance and of conservation of C and P symmetries leads to a reduction of the number of parameters to 5: g Z 1 , κ γ , κ Z , λ γ and λ Z . A further reduction is achieved by assuming the custodial SU(2) symmetry, which leads to the constraints ∆κ Z = ∆g Z 1 − ∆κ γ tan 2 θ W and λ Z = λ γ [2,3,4,5]. Here and in the following ∆ denotes the deviation from the Standard Model value of the couplings: ∆g Z 1 ≡ g Z 1 − 1, ∆κ γ ≡ κ γ − 1 and ∆κ Z ≡ κ Z − 1. This paper is organised as follows: Sec. 1 describes the methods of TGC measurements based on WW production at LEP, Sec. 2 reports the extraction of TGC's from the single W and single γ channels, Sec. 3 describes the measurement of W polarisation and Sec. 4 contains some conclusions. * Speaker.

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Measurement of triple gauge-boson couplings at 172 GeV

Cited by 31 publications

References 25 publications

Measurement of triple-gauge-boson couplings of the W boson at LEP

Measurement of triple-gauge-boson couplings of the W boson at LEP

Testing anomalous gauge couplings of the Higgs boson via weak-boson scatterings at the CERN LHC

Measurement of charged current triple gauge boson couplings

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