首页|Measurement of $CP$ violation in $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$ decays

Measurement of $CP$ violation in $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$ decays

来源：

Arxiv

英文摘要

A measurement is presented of decay-time-dependent $CP$ violation in the decays $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$, where the $J/\psi$ is reconstructed from two electrons and the $\psi(2S)$ from two muons. The analysis uses a sample of $pp$ collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\mathrm{fb}^{-1}$. The $CP$-violation observables are measured to be \begin{equation*} \begin{aligned} C\left(B^0\rightarrow J/\psi K^0_\mathrm{S}\right)&=\phantom{+}\,0.12\,\pm\,0.07\pm\,0.02\,, S\left(B^0\rightarrow J/\psi K^0_\mathrm{S}\right)&=\phantom{+}\,0.83\,\pm\,0.08\pm\,0.01\,, C\left(B^0\rightarrow\psi(2S) K^0_\mathrm{S}\right)&=-\,0.05\,\pm\,0.10\pm\,0.01\,, S\left(B^0\rightarrow\psi(2S) K^0_\mathrm{S}\right)&=\phantom{+}\,0.84\,\pm\,0.10\pm\,0.01\,, \end{aligned} \end{equation*} where $C$ describes $CP$ violation in the direct decay, and $S$ describes $CP$ violation in the interference between the amplitudes for the direct decay and for the decay after $B^0$-$\overline{B}^0$ oscillation. The first uncertainties are statistical and the second are systematic. The two sets of results are compatible with the previous LHCb measurement using $B^0\rightarrow J/\psi K^0_\mathrm{S}$ decays, where the $J/\psi$ meson was reconstructed from two muons. The averages of all three sets of LHCb results are \begin{equation*} \begin{aligned} C\left(B^0\rightarrow[c\bar{c}]K^0_\mathrm{S}\right)&=-0.017 \pm 0.029\,, S\left(B^0\rightarrow[c\bar{c}]K^0_\mathrm{S}\right)&=\phantom{+}0.760 \pm 0.034\,, \end{aligned} \end{equation*} under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions.

作者：M. Adinolfi、A. Weiden、P. Tsopelas、C. Marin Benito、B. Meadows、K. Hennessy、T. Fiutowski、A. Rollings、J. A. Rodriguez Lopez、T. Shears、M. Rama、L. Capriotti、U. Eitschberger、S. A. Wotton、T. H. Hancock、F. Pisani、J. Wicht、J. W. Ronayne、G. Alkhazov、M. Pepe Altarelli、X. Han、O. Gr¨1nberg、A. Dovbnya、P. Seyfert、P. Ibis、M. Idzik、K. Gizdov、C. Gaspar、M. Dziewiecki、P. Vazquez Regueiro、S. Eidelman、D. M. Saunders、M. Corvo、W. Byczynski、F. Toriello、T. J. V. Bowcock、A. A. Alves Jr、M. Gandelman、T. Nikodem、S. Stone、B. Rachwal、H. M. Wark、E. Luppi、I. T. Smith、Y. Shcheglov、S. F. Cheung、G. Wilkinson、M. Vesterinen、J. A. de Vries、A. Malinin、C. Santamarina Rios、S. T'Jampens、W. Funk、D. Gascon、P. H. Hopchev、J. Maratas、I. Bordyuzhin、O. De Aguiar Francisco、Z. Li、Y. Xie、E. Gushchin、L. Douglas、Y. Gao、J. Closier、C. Joram、F. Archilli、A. Ossowska、D. A. Milanes、A. B. Rodrigues、J. Cogan、E. Gersabeck、J. H. Lopes、T. Ruf、S. Malde、A. Mauri、M. Schmelling、E. Smith、A. Popov、D. C. Forshaw、R. B. Appleby、V. Battista、B. Leverington、M. Petruzzo、B. R. Gruberg Cazon、I. Polyakov、S. Roiser、G. Bencivenni、M. Smith、A. Pearce、M. W. Majewski、M. Kozeiha、A. Carbone、F. Ratnikov、A. Gomes、L. Gruber、G. Simi、M. Andreotti、S. Bifani、N. Tuning、T. Blake、J. Wang、I. V. Gorelov、E. Maurice、L. Sun、N. Farley、A. Palano、M. Demmer、J. Marks、H. Stevens、D. Johnson、S. Gallorini、F. Blanc、L. Carson、D. Hutchcroft、T. Momb?cher、A. Zhelezov、A. Pastore、E. Ben-Haim、P. Krokovny、I. Raniuk、T. Humair、V. Shevchenko、E. Bertholet、K. M¨1ller、V. Macko、G. J. Pomery、J. Smith、X. Yuan、A. Valassi、C. Hombach、T. Williams、L. L. Pappalardo、J. Arnau Romeu、X. Vilasis-Cardona、G. Manca、S. Eisenhardt、V. Bocci、A. Bay、M. Traill、F. Kress、M. John、G. Auriemma、A. Romero Vidal、R. Currie、W. Sutcliffe、A. Vagner、A. Badalov、R. A. Fini、W. Wislicki、Y. Amhis、A. Di Canto、J. M. De Miranda、M. Firlej、O. Lupton、L. Cassina、L. Cojocariu、S. Ponce、C. Hasse、M. Merk、R. Graciani Diaz、K. Wraight、T. Hadavizadeh、T. Kirn、S. Braun、A. Nogay、T. Lesiak、M. McCann、R. Jacobsson、J. Fu、A. Seuthe、M. E. Stramaglia、L. 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Betti、D. M¨1ller、P. Ruiz Valls、E. Khairullin、V. Renaudin、G. Valenti、E. Furfaro、A. Baranov、C. Meaux、Z. Yang、S. Akar、T. Colombo、O. Maev、I. Belyaev、V. Syropoulos、N. Bondar、L. Anderlini、I. Bediaga、W. Krzemien、B. G. Siddi、M. Stepanova、M. Zavertyaev、S. Farry、J. Garra Tico、D. Galli、M. -H. Schune、R. Kopecna、K. Klimaszewski、I. Shapoval、R. Dzhelyadin、N. Neri、F. Bossu、P. Perret、A. Lai、A. Petrolini、S. Monteil、S. De Capua、U. Straumann、B. Khanji、B. Voneki、S. Kotriakhova、D. Marangotto、M. Ebert、P. Gandini、M. Vernet、V. Vorobyev、G. Wormser、Z. Ajaltouni、C. G?bel、M. Schiller、C. D'Ambrosio、V. Kudryavtsev、S. Richards、K. Carvalho Akiba、J. J. Back、D. Melnychuk、C. Fitzpatrick、M. De Serio、A. Chubykin、S. Reichert、S. Perazzini、M. Veltri、R. Forty、F. Dettori、G. Carboni、W. Barter、V. Gibson、E. Santovetti、C. Prouve、F. Kruse、L. Silva de Oliveira、R. Lef¨¨vre、S. Coquereau、L. Henry、R. J. Barlow、C. J. G. Onderwater、U. Uwer、B. Sciascia、J. Garc¨aa Pardi?as、A. Ukleja、F. Redi、M. Shapkin、S. Esen、M. Ravonel Salzgeber、S. Baker、M. Calvi、S. Gian¨?、L. Zhang、B. Adeva、E. Tournefier、J. Jalocha、G. Veneziano、H. F. Schreiner、M. Clemencic、H. V. Cliff、N. Beliy、G. A. Cowan、I. Babuschkin、R. Tourinho Jadallah Aoude、K. Heinicke、L. M. Garcia Martin、M. G. Chapman、H. M. Evans、E. Bowen、M. Wilkinson、K. Dreimanis、B. Hamilton、P. Collins、R. Cenci、R. Bernet、D. Brundu、C. Satriano、L. Minzoni、K. Swientek、N. K. Watson、A. Oblakowska-Mucha、R. Cardinale、S. Sridharan、M. Rihl、R. Lindner、V. Egorychev、U. Egede、P. Mackowiak、A. Leflat、D. Lucchesi、T. Evans、A. Piucci、A. Beiter、L. An、LHCb collaboration、S. Amato、J. Dalseno、S. T. Harnew、M. Cattaneo、S. Cadeddu、A. Trisovic、J. Albrecht、L. Tomassetti、W. Hulsbergen、B. Saitta、A. Loi、G. Corti、O. G. Girard、S. Easo、D. C. Craik、M. Szymanski、R. Silva Coutinho、H. Yin、S. Ely、M. Winn、V. Cogoni、L. Garrido、A. Mogini、H. Cai、A. Papanestis、P. Durante、G. Tellarini、O. Steinkamp、D. Chamont、M. He?、B. Schmidt、J. Brodzicka、R. Le Gac、D. Berninghoff、I. A. Monroy、A. Camboni、U. Marconi、A. Fernandez Prieto、E. Gabriel、R. 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作者单位：

DOI：10.1007/JHEP11(2017)170

学科分类：物理学

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Measurement of $CP$ violation in $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$ decays

Measurement of $CP$ violation in $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$ decays

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