Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Violation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup></mml:math>Mixing Using Partial Reconst

Lees, J. P.; Poireau, V.; Tisserand, V.; Graugés, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lee, M. J.; Lynch, G.; Koch, H.; Schroeder, T. Vazquez; Hearty, C.; Mattison, T. S.; McKenna, J. A.; So, R. Y.; Khan, A.; Blinov, V.; Бузыкаев, А. Р.; Дружинин, В. П.; Голубев, В. Б.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu; Yushkov, A. N.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Dey, B.; Gary, J. W.; Long, O.; Vitug, G. M.; Campagnari, C.; Sevilla, M. Franco; Hong, T. M.; Kovalskyi, D.; Richman, J.; West, C.; Eisner, A. M.; Lockman, W. S.; Martínez, A. J.; Schumm, B. A.; Seiden, A.; Chao, D. S.; Cheng, C. H.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Andreassen, R.; Huard, Z.; Meadows, B.; Sokoloff, M. D.; Sun, L.; Bloom, P. C.; Ford, W. T.; Gaz, A.; Nauenberg, U.; Smith, J. G.; Wagner, S. R.; Ayad, R.; Toki, W. H.; Spaan, B.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Playfer, S.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Piemontese, L.; Santoro, V.; Baldini-Ferroli, R.; Calcaterra, A.; Sangro, R. de; Finocchiaro, G.; Martellotti, S.; Patterí, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Contri, R.; Guido, E.; Vetere, M. Lo; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Bhuyan, B.; Prasad, V.; Morii, M.; Adametz, A.; Uwer, U.; Lacker, H.; Dauncey, P.; Mallik, U.; Chen, C.; Cochran, J.; Meyer, W. T.; Prell, S.; Rubin, A. E.; Gritsan, A. V.; Arnaud, N.; Davier, M.; Деркач, Д.; Grosdidier, G.; Diberder, F. Le; Lutz, A. M.; Malaescu, B.; Roudeau, P.; Stocchi, A.; Wormser, G.; Lange, D.; Wright, D.; Coleman, J. P.; Fry, J. R.; Gabathuler, E.; Hutchcroft, D.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Lodovico, F. Di; Sacco, R.; Cowan, G.; Bougher, J.; Davis, C. L.; Denig, A.; Fritsch, M.; Gradl, W.; Grießinger, K.; Hafner, A.; Prencipe, E.; Barlow, R. J.; Lafferty, G. D.; Behn, E.; Cenci, R.; Hamilton, B.; Jawahery, A.; Roberts, D. A.; Cowan, R.; Dujmić, D.; Sciolla, G.; Cheaib, R.; Patel, P. M.; Robertson, S. H.; Biassoni, P.; Neri, N.; Palombo, F.; Cremaldi, L.; Godang, R.; Sonnek, P.; Summers, D. J.; Nguyen, X.; Simard, M.; Taras, P.; Nardo, G. De; Monorchio, D.; Onorato, G.; Sciacca, C.; Martinelli, M.; Raven, G.; Jessop, C.; LoSecco, J. M.; Honscheid, K.; Kass, R.; Brau, J. E.; Frey, R.; Sinev, N. B.; Strom, D.; Torrence, E.; Feltresi, E.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simi, G.; Simonetto, F.; Stroili, R.; Akar, S.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Leruste, Ph; Marchiori, G.; Ocariz, J.; Sitt, S.; Biasini, M.; Manoni, E.; Pacetti, S.; Rossi, A.; Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Pérez, A.; Rizzo, G.; Walsh, J.; Pegna, D. Lopes; Olsen, J.; Smith, A. J. S.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Gioi, L. Li; Piredda, G.; Bünger, C.; Grünberg, O.; Hartmann, T.; Leddig, T.; Voß, C.; Waldi, R.; Adye, T.; Olaiya, E. O.; Wilson, F. F.; Emery, S.; Monchenault, G. Hamel de; Vasseur, G.; Yèche, Ch; Anulli, F.; Aston, D.; Bard, D. J.; Benitez, J. F.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Ebert, M.; Field, R. C.; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Hast, C.; Innes, W. R.; Kim, P.; Kocian, M.; Leith, D. W. G. S.; Lewis, P.; Lindemann, D.; Lindquist, B.; Luitz, S.; Lüth, V.; Lynch, H. L.; MacFarlane, D. B.; Muller, D. R.; Neal, H. A.; Nelson, S.; Перл, М.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Schindler, R. H.; Snyder, A.; Su, D.; Sullivan, M. K.; Va’vra, J.; Wagner, A. P.; Wang, W. F.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Ziegler, V.; Park, W.; Purohit, M.; White, R. M.; Wilson, J. R.; Randle-Conde, A.; Sekula, S. J.; Bellis, M.; Burchat, P. R.; Miyashita, T. S.; Puccio, E. M. T.; Alam, M. S.; Ernst, J.; Gorodeisky, R.; Guttman, N.; Peimer, D. R.; Soffer, A.; Spanier, S.; Ritchie, J. L.; Ruland, A. M.; Schwitters, R. F.; Wray, B. C.; Izen, J. M.; Lou, X. C.; Bianchi, F.; Mori, F. De; Filippi, A.; Gamba, D.; Zambito, S.; Lanceri, L.; Vitale, L.; Martínez-Vidal, F.; Oyanguren, A.; Villanueva-Pérez, P.; Ahmed, H.; Albert, J.; Banerjee, S.; Bernlochner, F. U.; Choi, H. H. F.; King, G. J.; Kowalewski, R.; Lewczuk, M. J.; Lueck, T.; Nugent, I. M.; Roney, J. M.; Sobie, R.; Tasneem, N.; Gershon, T.; Harrison, P. F.; Latham, T.; Band, H. R.; Dasu, S.; Pan, Y. B.; Prepost, R.; Wu, S. L.

doi:10.1103/physrevlett.111.101802

Cited by 21 publications

(7 citation statements)

References 17 publications

(14 reference statements)

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“…PRL 117, 061803 (2016) P H Y S I C A L R E V I E W L E T T E R S week ending 5 AUGUST 2016 061803-4 of þ0.13 between this measurement and the LHCb measurement of a d sl [20]. The correlation mainly originates from the muon detection asymmetry and from the effect of a [5,20,[28][29][30][31][32]. The simple averages of pure a sl measurements, including the present a s sl result and accounting for the small correlation from LHCb, are found to be a d sl ¼ ð0.02 AE 0.20Þ% and a s sl ¼ ð0.17 AE 0.30Þ% with a correlation of þ0.07.…”

Section: H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 73%

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Measurement of theCPAsymmetry inBs0−B¯s0Mixing

Aaij¹,

Adeva²,

Adinolfi³

et al. 2016

Phys. Rev. Lett.

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The CP asymmetry in the mixing of B Correcting the observed charge asymmetry for detection and background effects, the CP asymmetry is found to be a s sl ¼ ð0.39 AE 0.26 AE 0.20Þ%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of a s sl to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics. DOI: 10.1103/PhysRevLett.117.061803 When neutral B mesons evolve in time they can change into their own antiparticles. This quantum-mechanical phenomenon is known as mixing and occurs in both neutral B meson systems, B 0 and B 0 s , where B is used to refer to either system. In this mixing process, the CP (chargeparity) symmetry is broken if the probability for a B meson to change into aB meson is different from the probability for the reverse process. This effect can be measured by studying decays into flavor-specific final states, B → f, such thatB → f transitions can only occur through the mixing processB → B → f. Such processes include semileptonic B decays, as the charge of the lepton identifies the flavor of the B meson at the time of its decay. The magnitude of the CP-violating asymmetry in B mixing can be characterized by the semileptonic asymmetry a sl . This is defined in terms of the partial decay rates, Γ, to semileptonic final states aswhere Δm (ΔΓ) is the difference in mass (decay width) between the mass eigenstates of the B system and ϕ 12 is a CP-violating phase [1]. In the standard model (SM), the asymmetry is predicted to be as small as a The high oscillation frequency Δm s reduces the effect of the small asymmetry in the production rates between B 0 s andB 0 s mesons in pp collisions by a factor 10 −3 [7,8]. Neglecting corrections, the untagged, time-integrated asymmetry is A raw ¼ a s sl =2, where the factor 2 reduction compared to the tagged asymmetry in Eq. (1) comes from the summation over mixed and unmixed decays. The tagged asymmetry would actually suffer from a larger reduction because of the tagging efficiency [9,10]. The * Full author list given at the end of the article.Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. PRL 117, 061803 (2016) P H Y S I C A L R E V I E W L E T T E R S week ending 5 AUGUST 20160031-9007=16=117(6)=061803 (9) 061803-1 © 2016 CERN, for the LHCb Collaboration unmixed decays have zero asymmetry due to CPT symmetry. The raw asymmetry is still affected by possible differences in detection efficiency for the two chargeconjugate final states and by backgrounds from otherwhere A det is the detection asymmetry, which is assessed from data using calibration samples, f bkg is the fraction of the b-hadron background, and A bkg the background asymmetry.The LHCb detector is a single-arm forward spectrometer designed for the study of particles containing b or c...

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Section: H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 73%

“…There is a small correlation coefficient [20,[28][29][30][31][32]. The yellow ellipse represents the D0 dimuon measurement with ΔΓ d =Γ d set to its SM expectation value [5].…”

Section: H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

Measurement of theCPAsymmetry inBs0−B¯s0Mixing

Aaij¹,

Adeva²,

Adinolfi³

et al. 2016

Phys. Rev. Lett.

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“…It is important to stress again that the almost O(10 −2 ) scale of that measured value is twenty times larger than SM expectations. On the other hand, the LHCb collaboration has recently started to measure the semileptonic asymmetry A s SL [4]; additional results concerning A s SL ± A d SL are also expected [23]. If the D0 measurement is to be interpreted as a clear signal of New Physics, LHCb results, in particular A s SL ± A d SL , should necessarily depart from the SM expectations…”

Section: Since the Mass Difference[20] Between The Eigenstates Of Hmentioning

confidence: 99%

“…The values reported by the D0 collaboration [1] are around "3σ" away from Standard Model expectations, and this triggered intense activity to explore the potential of an ample variety of models beyond the SM to produce such values. As A b SL can be expressed in terms of the individual asymmetries A d SL and A s SL of B 0 d -B 0 d and B 0 s -B 0 s systems [4], it is customary to discuss in terms of them. In particular, since it is a common thought that the B factories have left little space for New Physics (NP) to contribute new sources of CP violation in the B 0 d -B 0 d system, the focus [5] has been on A s SL .…”

Section: Introductionmentioning

confidence: 99%

“…Appendix A: Input Table I summarizes the experimental input [1,4,[38][39][40][41][42][43][44][45][46][47][48] used for the different calculations; measurements are interpreted as gaussians with the quoted values for the central value and the uncertainty. The ∆χ 2 [49]; although the results presented correspond to modelling the theoretical uncertainties in a gaussian manner, it has been checked that modelling them with uniform uncertainties restricted to 1σ or 2σ ranges produces no change.…”

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confidence: 99%

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Mixing asymmetries inBmeson systems, the D0 like-sign dimuon asymmetry, and generic new physics

et al. 2015

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The measurement of a large like-sign dimuon asymmetry A §L by the DO experiment at the Tevatron departs noticeably from Standard Model (SM) expectations and it may be interpreted as a hint of physics beyond the Standard Model contributing to AB ^ 0 transitions. In this work we analyze how the natural suppression of A$L in the SM can be circumvented by new physics. We consider generic Standard Model extensions where the charged current mixing matrix is enlarged with respect to the usual 3 x 3 unitary Cabibbo-Kobayashi-Maskawa matrix, and show how, within this framework, a significant enhancement over Standard Model expectations for A h SL is easily reachable through enhancements of the semileptonic asymmetries A(?L and AJL of both B°d-B°d and B°-B°s systems. Despite being insufficient to reproduce the DO measurement, such deviations from SM expectations may be probed by the LHCb experiment.

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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.

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Search forCPViolation inB0-B¯0Mixing Using Partial Reconst

Cited by 21 publications

References 17 publications

Measurement of theCPAsymmetry inBs0−B¯s0Mixing

Measurement of theCPAsymmetry inBs0−B¯s0Mixing

Mixing asymmetries inBmeson systems, the D0 like-sign dimuon asymmetry, and generic new physics

On new physics in ΔΓ d

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