Measurement of the W-pair production cross-section and W branching ratios in e
                      + 
                     e
                     - collisions at 
                
                  
                
                $\sqrt{s}$
               = 161-209 GeV

Abdallah, J.; Abreu, P.; Adam, W.; Adžić, P.; Albrecht, Thomas; Alderweireld, T.; Alemany–Fernández, R.; Allmendinger, T.; Allport, P. P.; Amaldi, U.; Amapane, N.; Amato, S.; Anashkin, E.; Andreazza, A.; Andringa, S.; Anjos, N.; Antilogus, P.; Apel, W. D.; Arnoud, Y.; Ask, S.; Åsman, B.; Augustin, E.; Augustinus, A.; Baillon, P.; Ballestrero, A.; Bambade, P.; Barbier, R.; Bardin, D. Y.; Barker, G. J.; Baroncelli, A.; Battaglia, M.; Baubillier, M.; Becks, K. H.; Begalli, M.; Behrmann, A.; Ben-Haim, E.; Benekos, N.; Benvenuti, A. C.; Bérat, C.; Berggren, M.; Berntzon, L.; Bertrand, Daniel; Besançon, M.; Besson, N.; Blöch, D.; Blom, M.; Bluj, M.; Bonesini, M.; Boonekamp, M.; Booth, Laurence; Borisov, G.; Botner, O.; Bouquet, B.; Bowcock, T. J. V.; Boyko, I. R.; Bračko, M.; Brenner, R.; Brodet, E.; Brückman, P.; Brunet, Michel; Bugge, L.; Buschmann, P.; Calvi, M.; Camporesi, T.; Canale, V.; Carena, F.; Castro, N. F.; Cavallo, F. R.; Chapkin, M.; Charpentier, Ph.; Checchia, P.; Chierici, R.; Chliapnikov, P.; Chudoba, J.; Chung, U.; Cieślik, K.; Collins, P.; Contri, R.; Cosme, G.; Cossutti, F.; Costa, J. Goncalves Pinto Firmino Da; Crennell, D.; Cuevas, J.; D’Hondt, J.; Dalmau, J.; Silva, T. da; Dasilva, Wlp; Ricca, G. Della; Angelis, A. De; Boer, W. De; Clercq, C. De; Lotto, B. De; Maria, N. De; Min, A. De; Paula, L. De; Ciaccio, L. Di; Simone, A. Di; Doroba, K.; Drees, J.; Dris, M.; Eigen, G.; Ekelöf, T.; Ellert, M.; Elsing, M.; Santo, C. E.; Fanourakis, G.; Fassouliotis, D.; Feindt, M.; Fernández, J. P.; Ferrer, A.; Ferro, F.; Flagmeyer, U.; Foeth, H.; Fokitis, E.; Fulda-Quenzer, F.; Fuster, J.; Gandelman, M.; García, C.; Gavillet, Ph.; Gazis, E. N.; Gokieli, R.; Golob, B.; Gómez-Ceballos, G.; Gonçalves, P.; Graziani, E.; Grosdidier, G.; Grzelak, K.; Guy, J.; Haag, C.; Hallgren, A.; Hamacher, K.; Hamilton, K.; Haug, S.; Hauler, F.; Hedberg, V.; Hennecke, M.; Herr, H.; Hoffman, J.; Holmgren, S. O.; Holt, J. M.; Houlden, A.; Hultqvist, K.; Jackson, Neil; Jarlskog, G.; Jarry, P.; Jeans, D.; Johansson, K. E.; Johansson, D.; Jönsson, P.; Joram, C.; Jungermann, L.; Kapusta, F.; Katsanevas, S.; Katsoufis, E.; Kernel, G.; Kerševan, B. P.; Kerzel, U.; Kiiskinen, A.; King, T.L.; Kjaer, J.; Kluit, P.; Kokkinias, P.; Kourkoumelis, C.; Kouznetsov, O.; Krumstein, Z.; Kucharczyk, M.; Lämsä, J.; Leder, G.; Ledroit, F.; Leinonen, L.; Leitner, R.; Lemonne, J.; Lepeltier, V.; Lesiak, T.; Liebig, W.; Liko, D.; Lipniacka, A.; Lopes, Helena J. Nussenzveig; Lopez, M.; Loukas, D.; Lutz, P.; Lyons, L.; MacNaughton, J.; Malek, A.; Maltezos, S.; Mandl, F.; Marco, J.; Marco, R.; Maréchal, B.; Margoni, M.; Marin, J. C.; Mariotti, C.; Μάρκου, Α.; Martínez-Rivero, C.; Mašík, J.; Mastroyiannopoulos, N.; Matorras, F.; Matteuzzi, C.; Mazzucato, F.; Mazzucato, M.; Nulty, R. Mc; Meroni, C.; Migliore, E.; Mitaroff, W.; Mjoernmark, U.; Moa, T.; Moch, M.; Mönig, K.; Monge, R.; Montenegro, J.; Moraes, D.; Moreno, S. Carrillo; Morettini, P.; Muêller, U.; Muenich, K.; Mulders, M.; Mundim, L.; Murray, W. J.; Muryn, B.; Myatt, G.; Myklebust, T.; Nassiakou, M.; Navarria, F. L.; Nawrocki, K.; Nicolaidou, R.; Nikolenko, M.; Obłąkowska-Mucha, A.; Obraztsov, V.; Olshevski, A. G.; Onofre, A.; Orava, R.; Österberg, K.; Ouraou, A.; Oyanguren, A.; Paganoni, M.; Paiano, S.; Palacios, Paloma de; Pałka, H.; Papadopoulou, D.; Pape, L.; Parkes, C.; Parodi, F.; Parzefall, U.; Passeri, A.; Passon, O.; Peralta, L.; Perepelitsa, V.; Perrotta, A.; Petrolini, A.; Piedra, J.; Pieri, L.; Pierre, F.; Pimenta, M.; Piotto, E.; Podobnik, T.; Poireau, V.; Pol, E.; Polok, G.; Poropat, P.; Pozdniakov, V.; Pukhaeva, N.; Pullia, A.; Rameš, J.; Ramler, L.; Read, K. F.; Rebecchi, P.; Rehn, J.; Reid, D.; Reinhardt, R.; Renton, P.; Richard, F.; Řídký, J.; Rivero, M.; Rodriguez, D. Rodriguez; Romero, A.; Ronchese, P.; Roudeau, P.; Rovelli, T.; Ruhlmann-Kleider, V.; Ryabtchikov, D.; Sadovsky, A.; Salmi, L.; Salt, J.; Savoy-Navarro, A.; Schwickerath, U.; Segar, A. M.; Sekulin, R.; Siebel, M.; Sisakian, A. N.; Smadja, G.; Smirnova, O.; Sokolov, A.; Sopczak, A.; Sosnowski, R.; Spassov, T.; Stanitzki, M. M.; Stocchi, A.; Strauss, J.; Stugu, B.; Szczekowski, M.; Szeptycka, M.; Szumlak, T.; Tabarelli, T.; Taffard, C.; Tegenfeldt, F.; Timmermans, J.; Tkatchev, L. G.; Tobin, M.; Todorovova, S.; Tomé, B.; Tonazzo, A.; Tortosa, P.; Trávničék, P.; Treille, D.; Tristram, G.; Trochimczuk, M.; Troncon, C.; Turluer, M. L.; Tyapkin, A.A.; Tyapkin, P.; Tzamarias, S.; Uvarov, V.; Valenti, G.; Dam, P. Van; Eldik, J. Van; Lysebetten, A. Van; Remortel, N. Van; Vulpen, I. van; Vegni, G.; Veloso, F.; Vénus, W.; Verdier, P.; Verzi, V.; Vilanova, D.; Vitale, L.; Vrba, V.; Wahlen, H.; Washbrook, J.; Weiser, C.; Wicke, D.; Wickens, J.; Wilkinson, G.; Winter, M.; Witek, M.; Yushchenko, O.; Zalewska, A.; Zalewski, P.; Zavrtanik, D.; Zhuravlov, V.; Zimin, I.; Zintchenko, A.; Župan, M.

doi:10.1140/epjc/s2004-01709-5

Cited by 28 publications

(5 citation statements)

References 43 publications

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“…where δ τ /π = 0.0016( 14) denotes the radiative corrections to the SM contributions [28]. As we can see, this observable represents another probe of the α 3 hL coefficient, and moreover it represents the only observable in our analysis sensitive to the α 3 Lq coefficient. Comparing the experimental value of R τ /π [6,29] and its SM prediction we get a bound of Λ > 3.1 TeV (90% C. L.) on the NP effective scale for the four Wilson coefficients appearing in Eq.…”

Section: A (Semi)leptonic τ Decays As Precise Electroweak Observablesmentioning

confidence: 89%

“…where f 1 = τ, b and f 2 = L, Q. We also have the following four-fermion operators [15]: 3 We noticed that the operator O 3 Lq in Eq. (11) can be strongly constrained by the experimental value of the τ → πντ process and it is consequently included in our analysis.…”

Section: The Effective Field Theory Frameworkmentioning

confidence: 99%

“…For this reason, and following Ref. [15], we do not include in our numerical analyses (i) operators involving top quarks; (ii) operators involving only third-generation fermions; or (iii) operators involving light quarks and third generation leptons 3 . Moreover, motivated by the experimental result shown in Eq.…”

Section: The Effective Field Theory Frameworkmentioning

confidence: 99%

“…We can work with a more realistic scenario keeping the third family Yukawas L = y t Q ht + y b Qhb + y τ Lhτ and neglecting only those of the two lightest generations. In this case the flavor symmetry breaks down to U (2) 5 × U (1) 3 , that we will just call U (2) 5 , since the three U (1) subgroups are simply the Lepton and Baryon number and Hypercharge of the third generation 4 .…”

Section: The Effective Field Theory Frameworkmentioning

confidence: 99%

“…the fact that the coupling of the W ± to the leptons does not depend on their flavor. However the experimental results from LEP-II on this issue [1][2][3][4][5] showed a slight deviation from universality coming from the third family, giving [6]:…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

U(2)5flavor symmetry and lepton universality violation inW→τν¯τ

2012

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The seeming violation of universality in the τ lepton coupling to the W boson suggested by LEP II data is studied using an Effective Field Theory (EFT) approach. Within this framework we explore how this feature fits into the current constraints from electroweak precision observables using different assumptions about the flavor structure of New Physics, namely [U (2) × U (1)] 5 and U (2) 5 . We show the importance of leptonic and semileptonic tau decay measurements, giving 3 − 4 TeV bounds on the New Physics effective scale at 90% C.L. We conclude under very general assumptions that it is not possible to accommodate this deviation from universality in the EFT framework, and thus such a signal could only be explained by the introduction of light degrees of freedom or New Physics strongly coupled at the electroweak scale. 2 The code can be freely downloaded at the web page http://ific.uv.es/lhcpheno/.

show abstract

Section: A (Semi)leptonic τ Decays As Precise Electroweak Observablesmentioning

confidence: 89%

Section: The Effective Field Theory Frameworkmentioning

confidence: 99%

Section: The Effective Field Theory Frameworkmentioning

confidence: 99%

Section: The Effective Field Theory Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

U(2)5flavor symmetry and lepton universality violation inW→τν¯τ

2012

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W-Boson Pair Production

Roth

Springer Tracts in Modern Physics

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Leptonic scalars at the LHC

Gouvêa

Dev²,

Dutta

et al. 2020

J. High Energ. Phys.

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We explore the collider prospects of neutrino non-standard interaction with a Standard Model (SM) gauge-singlet leptonic scalar φ carrying two units of lepton-numbercharge. These leptonic scalars are forbidden from interacting with the SM fermions at the renormalizable level and, if one allows for higher-dimensional operators, couple predominantly to SM neutrinos. For masses at or below the electroweak scale, φ decays exclusively into neutrinos. Its characteristic production signature at hadron collider experiments like the LHC would be via the vector boson fusion process and leads to same-sign dileptons, two forward jets in opposite hemispheres, and missing transverse energy, i.e., pp → ± α ± β jj + E miss T (α, β = e, µ, τ). Exploiting the final states of electrons and muons, we estimate, for the first time, the sensitivity of the LHC to these lepton-number-charged scalars. We show that the LHC sensitivity is largely complementary to that of low-energy precision measurements of the decays of charged leptons, charged mesons, W , Z and the SM Higgs boson, as well as the neutrino beam experiments like MINOS, and searches for neutrino self-interactions at IceCube and in cosmological observations. For φ mass larger than roughly 10 GeV, our projected LHC sensitivity would surpass all existing bounds.

show abstract

Measurement of the W-pair production cross-section and W branching ratios in e + e - collisions at $\sqrt{s}$ = 161-209 GeV

Cited by 28 publications

References 43 publications

U(2)5flavor symmetry and lepton universality violation inW→τν¯τ

U(2)5flavor symmetry and lepton universality violation inW→τν¯τ

W-Boson Pair Production

Leptonic scalars at the LHC

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