Observation of the $Λ_b^0\rightarrow J/ψp π^-$ decay

Autor: collaboration, L, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Cartelle, PA, Jr, AAA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Gutierrez, OA, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Băbeanu, A, Bachmann, S, Back, JJ, Badalov, A, Balagura, V, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Battista, V, Bay, A, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Belogurov, S, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Benton, J, Berezhnoy, A, Bernet, R, Bettler, M-O, Beuzekom, MV, Bien, A, Bifani, S, Bird, T, Bizzeti, A, Bjørnstad, PM, Blake, T, Blanc, F, Blouw, J, Blusk, S, Bocci, V, Bondar, A, Bondar, N, Bonivento, W, Borghi, S, Borgia, A, Borsato, M, Bowcock, TJV, Bowen, E, Bozzi, C, Brambach, T, Brand, JVD, Bressieux, J, Brett, D, Britsch, M, Britton, T, Brodzicka, J, Brook, NH, Brown, H, Bursche, A, Busetto, G, Buytaert, J, Cadeddu, S, Calabrese, R, Calvi, M, Gomez, MC, Camboni, A, Campana, P, Perez, DC, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carranza-Mejia, H, Carson, L, Akiba, KC, Casse, G, Cassina, L, Garcia, LC, Cattaneo, M, Cauet, C, Cenci, R, Charles, M, Charpentier, P, Chen, S, Cheung, S-F, Chiapolini, N, Chrzaszcz, M, Ciba, K, Vidal, XC, Ciezarek, G, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Coco, V, Cogan, J, Cogneras, E, Collins, P, Comerma-Montells, A, Contu, A, Cook, A, Coombes, M, Coquereau, S, Corti, G, Corvo, M, Counts, I, Couturier, B, Cowan, GA, Craik, DC, Torres, MC, Cunliffe, S, Currie, R, D'Ambrosio, C, Dalseno, J, David, P, David, PNY, Davis, A, Bruyn, KD, Capua, SD, Cian, MD, Miranda, JMD, Paula, LD, Silva, WD, Simone, PD, Decamp, D, Deckenhoff, M, Buono, LD, Déléage, N, Derkach, D, Deschamps, O, Dettori, F, Canto, AD, Dijkstra, H, Donleavy, S, Dordei, F, Dorigo, M, Suárez, AD, Dossett, D, Dovbnya, A, Dreimanis, K, Dujany, G, Dupertuis, F, Durante, P, Dzhelyadin, R, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Eitschberger, U, Ekelhof, R, Eklund, L, Rifai, IE, Elsasser, C, Ely, S, Esen, S, Evans, H-M, Evans, T, Falabella, A, Färber, C, Farinelli, C, Farley, N, Farry, S, Fay, RF, Ferguson, D, Albor, VF, Rodrigues, FF, Ferro-Luzzi, M, Filippov, S, Fiore, M, Fiorini, M, Firlej, M, Fitzpatrick, C, Fiutowski, T, Fontana, M, Fontanelli, F, Forty, R, Francisco, O, Frank, M, Frei, C, Frosini, M, Fu, J, Furfaro, E, Torreira, AG, Galli, D, Gallorini, S, Gambetta, S, Gandelman, M, Gandini, P, Gao, Y, Garofoli, J, Tico, JG, Garrido, L, Gaspar, C, Gauld, R, Gavardi, L, Gavrilov, G, Gersabeck, E, Gersabeck, M, Gershon, T, Ghez, P, Gianelle, A, Giani', S, Gibson, V, Giubega, L, Gligorov, VV, Göbel, C, Golubkov, D, Golutvin, A, Gomes, A, Gordon, H, Gotti, C, Gándara, MG, Diaz, RG, Cardoso, LAG, Graugés, E, Graziani, G, Grecu, A, Greening, E, Gregson, S, Griffith, P, Grillo, L, Grünberg, O, Gui, B, Gushchin, E, Guz, Y, Gys, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haines, SC, Hall, S, Hamilton, B, Hampson, T, Han, X, Hansmann-Menzemer, S, Harnew, N, Harnew, ST, Harrison, J, Hartmann, T, He, J, Head, T, Heijne, V, Hennessy, K, Henrard, P, Henry, L, Morata, JAH, Herwijnen, EV, Heß, M, Hicheur, A, Hill, D, Hoballah, M, Hombach, C, Hulsbergen, W, Hunt, P, Hussain, N, Hutchcroft, D, Hynds, D, Idzik, M, Ilten, P, Jacobsson, R, Jaeger, A, Jalocha, J, Jans, E, Jaton, P, Jawahery, A, Jing, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kaballo, M, Kandybei, S, Kanso, W, Karacson, M, Karbach, TM, Karodia, S, Kelsey, M, Kenyon, IR, Ketel, T, Khanji, B, Khurewathanakul, C, Klaver, S, Kochebina, O, Kolpin, M, Komarov, I, Koopman, RF, Koppenburg, P, Korolev, M, Kozlinskiy, A, Kravchuk, L, Kreplin, K, Kreps, M, Krocker, G, Krokovny, P, Kruse, F, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kurek, K, Kvaratskheliya, T, Thi, VNL, Lacarrere, D, Lafferty, G, Lai, A, Lambert, D, Lambert, RW, Lanciotti, E, Lanfranchi, G, Langenbruch, C, Langhans, B, Latham, T, Lazzeroni, C, Gac, RL, Leerdam, JV, Lees, J-P, Lefèvre, R, Leflat, A, Lefrançois, J, Leo, S, Leroy, O, Lesiak, T, Leverington, B, Li, Y, Liles, M, Lindner, R, Linn, C, Lionetto, F, Liu, B, Liu, G, Lohn, S, Longstaff, I, Lopes, JH, Lopez-March, N, Lowdon, P, Lu, H, Lucchesi, D, Luo, H, Lupato, A, Luppi, E, Lupton, O, Machefert, F, Machikhiliyan, IV, Maciuc, F, Maev, O, Malde, S, Manca, G, Mancinelli, G, Maratas, J, Marchand, JF, Marconi, U, Benito, CM, Marino, P, Märki, R, Marks, J, Martellotti, G, Martens, A, Sánchez, AM, Martinelli, M, Santos, DM, Vidal, FM, Tostes, DM, Massafferri, A, Matev, R, Mathe, Z, Matteuzzi, C, Mazurov, A, McCann, M, McCarthy, J, McNab, A, McNulty, R, McSkelly, B, Meadows, B, Meier, F, Meissner, M, Merk, M, Milanes, DA, Minard, M-N, Moggi, N, Rodriguez, JM, Monteil, S, Morandin, M, Morawski, P, Mordà, A, Morello, MJ, Moron, J, Morris, A-B, Mountain, R, Muheim, F, Müller, K, Muresan, R, Mussini, M, Muster, B, Naik, P, Nakada, T, Nandakumar, R, Nasteva, I, Needham, M, Neri, N, Neubert, S, Neufeld, N, Neuner, M, Nguyen, AD, Nguyen, TD, Nguyen-Mau, C, Nicol, M, Niess, V, Niet, R, Nikitin, N, Nikodem, T, Novoselov, A, O'Hanlon, DP, Oblakowska-Mucha, A, Obraztsov, V, Oggero, S, Ogilvy, S, Okhrimenko, O, Oldeman, R, Onderwater, G, Orlandea, M, Goicochea, JMO, Owen, P, Oyanguren, A, Pal, BK, Palano, A, Palombo, F, Palutan, M, Panman, J, Papanestis, A, Pappagallo, M, Parkes, C, Parkinson, CJ, Passaleva, G, Patel, GD, Patel, M, Patrignani, C, Alvarez, AP, Pearce, A, Pellegrino, A, Altarelli, MP, Perazzini, S, Trigo, EP, Perret, P, Perrin-Terrin, M, Pescatore, L, Pesen, E, Petridis, K, Petrolini, A, Olloqui, EP, Pietrzyk, B, Pilař, T, Pinci, D, Pistone, A, Playfer, S, Casasus, MP, Polci, F, Poluektov, A, Polycarpo, E, Popov, A, Popov, D, Popovici, B, Potterat, C, Price, E, Prisciandaro, J, Pritchard, A, Prouve, C, Pugatch, V, Navarro, AP, Punzi, G, Qian, W, Rachwal, B, Rademacker, JH, Rakotomiaramanana, B, Rama, M, Rangel, MS, Raniuk, I, Rauschmayr, N, Raven, G, Reichert, S, Reid, MM, Reis, ACD, Ricciardi, S, Richards, S, Rihl, M, Rinnert, K, Molina, VR, Romero, DAR, Robbe, P, Rodrigues, AB, Rodrigues, E, Perez, PR, Roiser, S, Romanovsky, V, Vidal, AR, Rotondo, M, Rouvinet, J, Ruf, T, Ruffini, F, Ruiz, H, Valls, PR, Sabatino, G, Silva, JJS, Sagidova, N, Sail, P, Saitta, B, Guimaraes, VS, Mayordomo, CS, Sedes, BS, Santacesaria, R, Rios, CS, Santovetti, E, Sapunov, M, Sarti, A, Satriano, C, Satta, A, Saunders, DM, Savrie, M, Savrina, D, Schiller, M, Schindler, H, Schlupp, M, Schmelling, M, Schmidt, B, Schneider, O, Schopper, A, Schune, M-H, Schwemmer, R, Sciascia, B, Sciubba, A, Seco, M, Semennikov, A, Sepp, I, Serra, N, Serrano, J, Sestini, L, Seyfert, P, Shapkin, M, Shapoval, I, Shcheglov, Y, Shears, T, Shekhtman, L, Shevchenko, V, Shires, A, Coutinho, RS, Simi, G, Sirendi, M, Skidmore, N, Skwarnicki, T, Smith, NA, Smith, E, Smith, J, Smith, M, Snoek, H, Sokoloff, MD, Soler, FJP, Soomro, F, Souza, D, Paula, BSD, Spaan, B, Sparkes, A, Spradlin, P, Stagni, F, Stahl, M, Stahl, S, Steinkamp, O, Stenyakin, O, Stevenson, S, Stoica, S, Stone, S, Storaci, B, Stracka, S, Straticiuc, M, Straumann, U, Stroili, R, Subbiah, VK, Sun, L, Sutcliffe, W, Swientek, K, Swientek, S, Syropoulos, V, Szczekowski, M, Szczypka, P, Szilard, D, Szumlak, T, T'Jampens, S, Teklishyn, M, Tellarini, G, Teubert, F, Thomas, C, Thomas, E, Tilburg, JV, Tisserand, V, Tobin, M, Tolk, S, Tomassetti, L, Tonelli, D, Topp-Joergensen, S, Torr, N, Tournefier, E, Tourneur, S, Tran, MT, Tresch, M, Tsaregorodtsev, A, Tsopelas, P, Tuning, N, Garcia, MU, Ukleja, A, Ustyuzhanin, A, Uwer, U, Vagnoni, V, Valenti, G, Vallier, A, Gomez, RV, Regueiro, PV, Sierra, CV, Vecchi, S, Velthuis, JJ, Veltri, M, Veneziano, G, Vesterinen, M, Viaud, B, Vieira, D, Diaz, MV, Vilasis-Cardona, X, Vollhardt, A, Volyanskyy, D, Voong, D, Vorobyev, A, Vorobyev, V, Voß, C, Voss, H, Vries, JAD, Waldi, R, Wallace, C, Wallace, R, Walsh, J, Wandernoth, S, Wang, J, Ward, DR, Watson, NK, Websdale, D, Whitehead, M, Wicht, J, Wiedner, D, Wilkinson, G, Williams, MP, Williams, M, Wilson, FF, Wimberley, J, Wishahi, J, Wislicki, W, Witek, M, Wormser, G, Wotton, SA, Wright, S, Wu, S, Wyllie, K, Xie, Y, Xing, Z, Xu, Z, Yang, Z, Yuan, X, Yushchenko, O, Zangoli, M, Zavertyaev, M, Zhang, L, Zhang, WC, Zhang, Y, Zhelezov, A, Zhokhov, A, Zhong, L, Zvyagin, A
Rok vydání: 2014
Předmět:
Zdroj: Journal of High Energy Physics. (7)
ISSN: 1029-8479
Popis: The first observation of the Cabibbo-suppressed decay $\Lambda_b^0\rightarrow J/\psi p \pi^-$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\rm fb^{-1}$. A prominent signal is observed and the branching fraction relative to the decay mode $\Lambda_b^0\rightarrow J/\psi p K^-$ is determined to be $$ \frac{{\cal B}(\Lambda_b^0\rightarrow J/\psi p \pi^-)}{{\cal B}(\Lambda_b^0\rightarrow J/\psi p K^-)}=0.0824\pm0.0025\:(\text{stat})\pm0.0042\:(\text{syst}). $$ A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be $$ {\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p \pi^-)-{\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p K^-)=(+5.7\pm 2.4\:(\text{stat})\pm1.2\:(\text{syst}))\%, $$ which is compatible with CP symmetry at the $2.2\sigma$ level.
Databáze: OpenAIRE