Measurement of the CP-violating phase β in B0→J/ψπ+π− decays and limits on penguin effects

Measurement of the CP-violating phase β in B0→J/ψπ+π− decays and limits on penguin effects

Time-dependent CP violation is measured in the B▪0→J/ψπ+π− channel for each π+π− resonant final state using data collected with an integrated luminosity of 3.0 fb−1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle...

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Veröffentlicht in:Physics letters. B 2015-03, Vol.742, p.38-49
Hauptverfasser: Ajaltouni, Z., Amhis, Y., An, L., Anderlini, L., Andreotti, M., Aquines Gutierrez, O., Barlow, R.J., Beddow, J., Belyaev, I., Ben-Haim, E., Bencivenni, G., Bertolin, A.B., van Beuzekom, M., Blouw, J., Bocci, V., Britsch, M., Britton, T., Buytaert, J., Cadeddu, S., Campana, P., Cardinale, R., Cardini, A., Carson, L., Cattaneo, M., Cauet, Ch, Cenci, R., Comerma-Montells, A., Corvo, M., Dalseno, J., David, P.N.Y., De Bruyn, K., Dean, C.-T., Decamp, D., Derkach, D., Dettori, F., Dijkstra, H., El Rifai, I., Esen, S., Evans, H.-M., Ferreira Rodrigues, F., Frank, M., Gazzoni, G., Gianì, S., Giubega, L., Gotti, C., Gui, B., Hall, S., Harnew, N., Harrison, J., Head, T., Henrard, P., Hernando Morata, J.A., Hulsbergen, W., Hussain, N., Idzik, M., Johnson, D., Kelsey, M., Korolev, M., Lambert, R.W., Lanfranchi, G., Lees, J.-P., Lefrançois, J., Li, Y., Marconi, U., Marin Benito, C., Matteuzzi, C., Mazurov, A., McCann, M., McSkelly, B., Merk, M., Naik, P., Neri, N., Obraztsov, V., Oldeman, R., Palombo, F., Parkinson, C.J., Picatoste Olloqui, E., Pilař, T., Pistone, A., Polci, F., Price, E., Rachwal, B., Rama, M., Rauschmayr, N., Raven, G., Saitta, B., Seyfert, P., Shcheglov, Y., Shires, A., Simi, G., Sokoloff, M.D., Sridharan, S., Sterpka, F., Stevenson, S., Trisovic, A., Tsopelas, P., Veneziano, G., Vilasis-Cardona, X., Voß, C., Wilson, F.F.
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:Time-dependent CP violation is measured in the B▪0→J/ψπ+π− channel for each π+π− resonant final state using data collected with an integrated luminosity of 3.0 fb−1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6−6.3+2.8)°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, B▪s0→J/ψϕ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs is limited to be within the interval [−1.05°,+1.18°] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2015.01.008