Evidence for an anomalous like-sign dimuon charge asymmetry

Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M. R.; Adams, T.; Aguiló, E.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Ancu, L. S.; Aoki, M.; Arnoud, Y.; Arov, M.; Askew, A.; Åsman, B.; Atramentov, O.; Ávila, C.; Backusmayes, J.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Barberis, E.; Barfuss, A. F.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Beale, S.; Bean, A.; Begalli, M.; Begel, M.; Bélanger-Champagne, C.; Bellantoni, L.; Benitez, J. A.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besançon, M.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Blazey, G.; Blessing, S.; Bloom, K.; Boehnlein, A.; Boline, D.; Bolton, T.; Boos, E.; Borissov, G.; Bose, T.; Brandt, A.; Brock, R.; Brooijmans, G.; Bross, A.; Brown, D.; Bu, X. B.; Buchholz, D.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Burnett, T. H.; Buszello, C. 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E.; Fortner, M.; Fox, H.; Fuess, S.; Gadfort, T.; García-Bellido, A.; Gavrilov, V.; Gay, P.; Geist, W.; Geng, W.; Gerbaudo, D.; Gerber, C. E.; Gershtein, Y.; Gillberg, D.; Ginther, G.; Golovanov, G.; Goussiou, A. G.; Grannis, P. D.; Greder, S.; Greenlee, H.; Greenwood, Z. D.; Gregores, E. M.; Grenier, G.; Gris, Ph.; Grivaz, J.-F.; Grohsjean, A.; Grünendahl, S.; Grünewald, M.; Guo, F.; Guo, J.; Gutiérrez, G.; Gutiérrez, P.; Haas, A.; Haefner, P.; Hagopian, S.; Haley, J.; Hall, I.; Liu, Han; Harder, K.; Harel, A.; Hauptman, J. M.; Hays, J.; Hebbeker, T.; Hedin, D.; Heinson, A. P.; Heintz, U.; Hensel, C.; Cruz, I. Heredia-De La; Herner, K.; Hesketh, G. G.; Hildreth, M.; Hirosky, R.; Hoang, T.; Hobbs, J.; Hoeneisen, B.; Hohlfeld, M.; Hossain, S.; Houben, P.; Hu, Y.; Hubáček, Z.; Huske, N.; Hynek, V.; Iashvili, I.; Illingworth, R.; Ito, A. S.; Jabeen, S.; Jaffré, M.; Jain, Sh.; Jamin, D.; Jesik, R.; Johns, K.; Johnson, C. A.; Johnson, M.; Johnston, D.; Jonckheere, A.; Jönsson, P.; Rozas, A. Juste; Kaadze, K.; Kajfasz, E.; Karmanov, D.; Kasper, P. A.; Katsanos, I.; Kehoe, R.; Kermiche, S.; Khalatyan, N.; Khanov, A.; Kharchilava, A.; Kharzheev, Y. N.; Khatidze, D.; Kirby, M.; Kirsch, Matthias; Kohli, J. M.; Kozelov, A. V.; Kraus, J. K.; Kumar, Ashok; Kupčo, A.; Kurča, T.; Kuzmin, V. A.; Kvita, J.; Lammers, S.; Landsberg, G.; Lebrun, P.; Lee, H. S.; Lee, W. M.; Lellouch, J.; Li, L.; Li, Q. Z.; Lietti, S. M.; Lim, Jaehoon; Lincoln, D.; Linnemann, J.; Lipaev, V. V.; Lipton, R.; Liu, Y.; Liu, Z.; Lobodenko, A.; Lokajı́ček, M.; Love, P. A.; Lubatti, H. J.; Luna-García, R.; Lyon, A. L.; Maciel, A. K.A.; Mackin, D.; Madar, R.; Magaña-Villalba, R.; Mal, P.; Malik, S.; Malyshev, V. L.; Maravin, Y.; Martínez-Ortega, J.; McCarthy, R. L.; McGivern, C. L.; Meijer, M. M.; Melnitchouk, A.; Menezes, D.; Mercadante, P. G.; Merkin, M.; Meyer, A.; Meyer, J.; Mondal, N. K.; Moulik, T.; Muanza, G. 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D.; Scheglov, Y.; Schellman, H.; Schliephake, T.; Schlobohm, S.; Schwanenberger, C.; Schwienhorst, R.; Sekaric, J.; Severini, H.; Shabalina, E.; Shary, V.; Shchukin, A. A.; Shivpuri, R. K.; Šimák, V.; Sirotenko, V.; Skubic, P.; Slattery, P.; Smirnov, D.; Snow, G. R.; Snow, J.; Snyder, S.; Söldner-Rembold, S.; Sonnenschein, L.; Sopczak, A.; Sosebee, M.; Soustružnı́k, K.; Spurlock, B.; Stark, J.; Stolin, V.; Stoyanova, D. A.; Strang, M.; Strauss, E.; Strauss, M.; Ströhmer, R.; Strom, D.; Stutte, L.; Svoisky, P.; Takahashi, M.; Tanasijczuk, A. J.; Taylor, W.; Tiller, B.; Titov, M.; Tokmenin, V. V.; Tsybychev, D.; Tuchming, B.; Tully, C.; Tuts, P. M.; Unalan, R.; Uvarov, L.; Uvarov, S.; Uzunyan, S.; Kooten, R. Van; Leeuwen, W. M. Van; Varelas, N.; Varnes, E. W.; Vasilyev, I. A.; Verdier, P.; Vertogradov, L. S.; Verzocchi, M.; Vesterinen, M.; Vilanova, D.; Vint, P.; Vokáč, P.; Wahl, H. D.; Wang, Michael; Warchol, J.; Watts, G.; Wayne, M.; Weber, G.; Weber, M.; Wetstein, M.; White, A.; Wicke, D.; Williams, Mark Richard James; Wilson, G. W.; Wimpenny, S.; Wobisch, M.; Wood, D.; Wyatt, T. R.; Xie, Y.; Xu, C.; Yacoob, S.; Yamada, R.; Yang, W. C.; Yasuda, T.; Yatsunenko, Y. A.; Ye, Z.; Yin, H.; Yip, K.; Yoo, H. D.; Youn, S. W.; Yu, J.; Zelitch, S.; Zhao, T.; Zhou, B.; Zhu, J.; Zieliński, M.; Ziemińska, D.; Živković, L.

doi:10.1103/physrevd.82.032001

Cited by 147 publications

(86 citation statements)

References 24 publications

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“…The sign of C Γ d is such that a positive value of ∆Γ d gives a negative contribution to A CP and C Γs turns out to be negligible. It follows that the measured like-sign dimuon asymmetry is not simply proportional to the semi-leptonic asymmetries a d,s sl , as assumed in [1][2][3]. Very recently the DØ collaboration presented a new measurement [8] of the coefficients C d , C s and C Γ d (C Γs was neglected) and more importantly of the inclusive single-muon charge asymmetry a CP and the asymmetry A CP .…”

Section: Jhep06(2014)040mentioning

confidence: 98%

“…Because of the large uncertainty in ∆Γ d , the experimental numbers do not provide any stringent constraint on φ d at present. 1 For the phase φ s the 68% confidence level (CL) ranges are given in table 1.…”

Section: Jhep06(2014)040mentioning

confidence: 99%

“…The experimental measurements of the like-sign dimuon asymmetry by the DØ collaboration in 2010 and 2011 [1][2][3] [3] deviates by 3.9σ from the latest Standard Model (SM) prediction [4]. One finds, however, that new-physics contributions in ∆B = 2 transitions alone cannot explain the large central value of the like-sign dimuon asymmetry, since such a large enhancement would violate model-independent bounds (see e.g.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On new physics in ΔΓ d

Bobeth

Haisch

Lenz

et al. 2014

J. High Energ. Phys.

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Motivated by the recent measurement of the dimuon asymmetry by the DØ collaboration, which could be interpreted as an enhanced decay rate difference in the neutral B d -meson system, we investigate the possible size of new-physics contributions to ∆Γ d . In particular, we perform model-independent studies of non-standard effects associated to the dimension-six current-current operators (dp)(p b) with p, p = u, c as well as (db)(τ τ ). In both cases we find that for certain flavour or Lorentz structures of the operators sizeable deviations of ∆Γ d away from the Standard Model expectation cannot be excluded in a model-independent fashion.

show abstract

Section: Jhep06(2014)040mentioning

confidence: 98%

Section: Jhep06(2014)040mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On new physics in ΔΓ d

Bobeth

Haisch

Lenz

et al. 2014

J. High Energ. Phys.

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show abstract

“…As we will show, these sources appear in different combinations in the two topinduced CP asymmetries, providing a tool to test the origin of the anomalous result in Eq. (1).…”

mentioning

confidence: 99%

TopBPhysics at the LHC

et al. 2013

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In top-pair events where at least one of the tops decays semileptonically, the identification of the lepton charge allows us to tag not only the top quark charge but also that of the subsequent b quark. In cases where the b also decays semileptonically, the charge of the two leptons can be used to probe CP violation in heavy flavor mixing and decays. This strategy to measure CP violation is independent of those adopted so far in experiments, and can already constrain non standard model sources of CP violation with current and near future LHC data. To demonstrate the potential of this method we construct two CP asymmetries based on same-sign and opposite-sign leptons and estimate their sensitivities. This proposal opens a new window for doing precision measurements of CP violation in b and c quark physics via high p T processes at ATLAS and CMS. Introduction.-The copious production of top quarks at the LHC is usually exploited to explore various top properties or search for new heavy resonances. However, it also opens up the possibility to perform flavor precision measurements. Here we suggest to use the top quark decay products in order to probe CP violation (CPV) in heavy flavor mixing and decays.All existing analyses of CPV in B physics rely on a coherent production of b " b pairs, either from the decay of a b " b resonance or from gluon splitting, where the total b flavor charge at production vanishes. However, top physics gives another source of b's, and due to the large top mass and small width, to a good approximation, a top decay yields a definite nonzero b flavor charge. This charge can be unambiguously tagged at the time of decay by the charge of the lepton daughter of the W (originating from the top). In cases where the b also decays semileptonically, we can construct two CP asymmetries, one in which the latter lepton and the one from the W are of the same sign, and the other with opposite signs. In principle, with a good mass resolution one can also use hadronic decay modes of the b; however, this would be hard to achieve in the near future at ATLAS and CMS.To make our discussion more concrete, let us consider the interesting result obtained by the D0 collaboration at the Tevatron on the CP-violating like-sign dimuon asymmetry [1]:

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“…Flavor symmetric fields can in principle explain this anomaly in a flavor safe manner [14]. In addition, some fields of this form can potentially explain both the tt anomaly and same sign dimuon anomaly reported in [15] by DØ at the same time [11]. 2 Table 1.…”

Section: Jhep11(2011)139mentioning

confidence: 95%

EWPD constraints on flavor symmetric vector fields

Grinstein

Murphy

Trott

2011

J. High Energ. Phys.

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Electroweak precision data constraints on flavor symmetric vector fields are determined. The flavor multiplets of spin one that we examine are the complete set of fields that couple to quark bi-linears at tree level while not initially breaking the quark global flavor symmetry group. Flavor safe vector masses proximate to, and in some cases below, the electroweak symmetry breaking scale are found to be allowed. Many of these fields provide a flavor safe mechanism to explain the tt forward backward anomaly, and can simultaneously significantly raise the allowed values of the Standard Model Higgs mass consistent with electroweak precision data.

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Evidence for an anomalous like-sign dimuon charge asymmetry

Abstract: We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb −1 of pp collisions recorded with the D0 detector at a center-of-mass energy √ s = 1.96 TeV at the Fermilab Tevatron collider.

Cited by 147 publications

References 24 publications

On new physics in ΔΓ d

On new physics in ΔΓ d

TopBPhysics at the LHC

EWPD constraints on flavor symmetric vector fields

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