Model-independent measurement of the CKM angle $γ$ using $B^0 \to D
K^{\ast 0}$ decays with $D \to K_{S}^{0} π^{+} π^{-}$ and $K_{S}^{0}
K^{+} K^{-}$
JHEP 06 131-131
Authors:
R Aaij, CA Beteta, B Adeva, M Adinolfi, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, S Ali, G Alkhazov, PA Cartelle, AAA Jr, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, JE Andrews, RB Appleby, OA Gutierrez, F Archilli, P d'Argent, A Artamonov, M Artuso, E Aslanides, G Auriemma, M Baalouch, S Bachmann, JJ Back, A Badalov, C Baesso, S Baker, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, V Batozskaya, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, LJ Bel, V Bellee, N Belloli, I Belyaev, E Ben-Haim, G Bencivenni, S Benson, J Benton, A Berezhnoy, R Bernet, A Bertolin, F Betti, M-O Bettler, MV Beuzekom, S Bifani, P Billoir, T Bird, A Birnkraut, A Bizzeti, T Blake, F Blanc, J Blouw, S Blusk, V Bocci, A Bondar, N Bondar, W Bonivento, A Borgheresi, S Borghi, M Borisyak, M Borsato, M Boubdir, TJV Bowcock, E Bowen, C Bozzi, S Braun, M Britsch, T Britton, J Brodzicka, E Buchanan, C Burr, A Bursche, J Buytaert, S Cadeddu, R Calabrese, M Calvi, MC Gomez, P Campana, DC Perez, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, P Carniti, L Carson, KC Akiba, G Casse, L Cassina, LC Garcia, M Cattaneo, C Cauet, G Cavallero, R Cenci, M Charles, P Charpentier, G Chatzikonstantinidis, M Chefdeville, S Chen, S-F Cheung, V Chobanova, M Chrzaszcz, XC Vidal, G Ciezarek, PEL Clarke, M Clemencic, HV Cliff, J Closier, V Coco, J Cogan, E Cogneras, V Cogoni, L Cojocariu, G Collazuol, P Collins, A Comerma-Montells, A Contu, A Cook, S Coquereau, G Corti, M Corvo, B Couturier, GA Cowan, DC Craik, A Crocombe, MC Torres, S Cunliffe, R Currie, C D'Ambrosio, E Dall'Occo, J Dalseno, PNY David, A Davis, ODA Francisco, KD Bruyn, SD Capua, MD Cian, JMD Miranda, LD Paula, PD Simone, C-T Dean, D Decamp, M Deckenhoff, LD Buono, N Déléage, M Demmer, D Derkach, O Deschamps, F Dettori, B Dey, AD Canto, H Dijkstra, F Dordei, M Dorigo, AD Suárez, A Dovbnya, K Dreimanis, L Dufour, G Dujany, K Dungs, P Durante, R Dzhelyadin, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, IE Rifai, C Elsasser, S Ely, S Esen, HM Evans, T Evans, A Falabella, C Färber, N Farley, S Farry, R Fay, D Fazzini, D Ferguson, VF Albor, F Ferrari, FF Rodrigues, M Ferro-Luzzi, S Filippov, M Fiore, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, F Fleuret, K Fohl, M Fontana, F Fontanelli, DC Forshaw, R Forty, M Frank, C Frei, M Frosini, J Fu, E Furfaro, AG Torreira, D Galli, S Gallorini, S Gambetta, M Gandelman, P Gandini, Y Gao, JG Pardiñas, JG Tico, L Garrido, PJ Garsed, D Gascon, C Gaspar, L Gavardi, G Gazzoni, D Gerick, E Gersabeck, M Gersabeck, T Gershon, P Ghez, S Gianì, V Gibson, OG Girard, L Giubega, VV Gligorov, C Göbel, D Golubkov, A Golutvin, A Gomes, C Gotti, MG Gándara, RG Diaz, LAG Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, P Griffith, L Grillo, O Grünberg, E Gushchin, Y Guz, T Gys, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, SC Haines, S Hall, B Hamilton, X Han, S Hansmann-Menzemer, N Harnew, ST Harnew, J Harrison, J He, T Head, A Heister, K Hennessy, P Henrard, L Henry, JAH Morata, EV Herwijnen, M Heß, A Hicheur, D Hill, M Hoballah, C Hombach, L Hongming, W Hulsbergen, T Humair, M Hushchyn, N Hussain, D Hutchcroft, M Idzik, P Ilten, R Jacobsson, A Jaeger, J Jalocha, E Jans, A Jawahery, M John, D Johnson, CR Jones, C Joram, B Jost, N Jurik, S Kandybei, W Kanso, M Karacson, TM Karbach, S Karodia, M Kecke, M Kelsey, IR Kenyon, M Kenzie, T Ketel, E Khairullin, B Khanji, C Khurewathanakul, T Kirn, S Klaver, K Klimaszewski, M Kolpin, I Komarov, RF Koopman, P Koppenburg, M Kozeiha, L Kravchuk, K Kreplin, M Kreps, P Krokovny, F Kruse, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, AK Kuonen, K Kurek, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, D Lambert, G Lanfranchi, C Langenbruch, B Langhans, T Latham, C Lazzeroni, RL Gac, JV Leerdam, J-P Lees, R Lefèvre, A Leflat, J Lefrançois, EL Cid, O Leroy, T Lesiak, B Leverington, Y Li, T Likhomanenko, R Lindner, C Linn, F Lionetto, B Liu, X Liu, D Loh, I Longstaff, JH Lopes, D Lucchesi, ML Martinez, H Luo, A Lupato, E Luppi, O Lupton, N Lusardi, A Lusiani, X Lyu, F Machefert, F Maciuc, O Maev, K Maguire, S Malde, A Malinin, G Manca, G Mancinelli, P Manning, A Mapelli, J Maratas, JF Marchand, U Marconi, CM Benito, P Marino, J Marks, G Martellotti, M Martin, M Martinelli, DM Santos, FM Vidal, DM Tostes, LM Massacrier, A Massafferri, R Matev, A Mathad, Z Mathe, C Matteuzzi, A Mauri, B Maurin, A Mazurov, M McCann, J McCarthy, A McNab, R McNulty, B Meadows, F Meier, M Meissner, D Melnychuk, M Merk, A Merli, E Michielin, DA Milanes, M-N Minard, DS Mitzel, JM Rodriguez, IA Monroy, S Monteil, M Morandin, P Morawski, A Mordà , MJ Morello, J Moron, AB Morris, R Mountain, F Muheim, D Müller, J Müller, K Müller, V Müller, M Mussini, B Muster, P Naik, T Nakada, R Nandakumar, A Nandi, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, M Neuner, AD Nguyen, C Nguyen-Mau, V Niess, S Nieswand, R Niet, N Nikitin, T Nikodem, A Novoselov, DP O'Hanlon, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, O Okhrimenko, R Oldeman, CJG Onderwater, BO Rodrigues, JMO Goicochea, A Otto, P Owen, A Oyanguren, A Palano, F Palombo, M Palutan, J Panman, A Papanestis, M Pappagallo, LL Pappalardo, C Pappenheimer, W Parker, C Parkes, G Passaleva, GD Patel, M Patel, C Patrignani, A Pearce, A Pellegrino, G Penso, MP Altarelli, S Perazzini, P Perret, L Pescatore, K Petridis, A Petrolini, M Petruzzo, EP Olloqui, B Pietrzyk, M Pikies, D Pinci, A Pistone, A Piucci, S Playfer, MP Casasus, T Poikela, F Polci, A Poluektov, I Polyakov, E Polycarpo, A Popov, D Popov, B Popovici, C Potterat, E Price, JD Price, J Prisciandaro, A Pritchard, C Prouve, V Pugatch, AP Navarro, G Punzi, W Qian, R Quagliani, B Rachwal, JH Rademacker, M Rama, MR Pernas, MS Rangel, I Raniuk, G Raven, F Redi, S Reichert, ACD Reis, V Renaudin, S Ricciardi, S Richards, M Rihl, K Rinnert, VR Molina, P Robbe, AB Rodrigues, E Rodrigues, JAR Lopez, PR Perez, A Rogozhnikov, S Roiser, V Romanovsky, AR Vidal, JW Ronayne, M Rotondo, T Ruf, PR Valls, JJS Silva, N Sagidova, B Saitta, VS Guimaraes, CS Mayordomo, BS Sedes, R Santacesaria, CS Rios, M Santimaria, E Santovetti, A Sarti, C Satriano, A Satta, DM Saunders, D Savrina, S Schael, M Schiller, H Schindler, M Schlupp, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, M Schubiger, M-H Schune, R Schwemmer, B Sciascia, A Sciubba, A Semennikov, A Sergi, N Serra, J Serrano, L Sestini, P Seyfert, M Shapkin, I Shapoval, Y Shcheglov, T Shears, L Shekhtman, V Shevchenko, A Shires, BG Siddi, RS Coutinho, LSD Oliveira, G Simi, M Sirendi, N Skidmore, T Skwarnicki, E Smith, IT Smith, J Smith, M Smith, H Snoek, MD Sokoloff, FJP Soler, F Soomro, D Souza, BSD Paula, B Spaan, P Spradlin, S Sridharan, F Stagni, M Stahl, S Stahl, S Stefkova, O Steinkamp, O Stenyakin, S Stevenson, S Stoica, S Stone, B Storaci, S Stracka, M Straticiuc, U Straumann, L Sun, W Sutcliffe, K Swientek, S Swientek, V Syropoulos, M Szczekowski, T Szumlak, S T'Jampens, A Tayduganov, T Tekampe, G Tellarini, F Teubert, C Thomas, E Thomas, JV Tilburg, V Tisserand, M Tobin, S Tolk, L Tomassetti, D Tonelli, S Topp-Joergensen, E Tournefier, S Tourneur, K Trabelsi, M Traill, MT Tran, M Tresch, A Trisovic, A Tsaregorodtsev, P Tsopelas, N Tuning, A Ukleja, A Ustyuzhanin, U Uwer, C Vacca, V Vagnoni, S Valat, G Valenti, A Vallier, RV Gomez, PV Regueiro, CV Sierra, S Vecchi, MV Veghel, JJ Velthuis, M Veltri, G Veneziano, M Vesterinen, B Viaud, D Vieira, MV Diaz, X Vilasis-Cardona, V Volkov, A Vollhardt, D Voong, A Vorobyev, V Vorobyev, C Voß, JAD Vries, R Waldi, C Wallace, R Wallace, J Walsh, J Wang, DR Ward, NK Watson, D Websdale, A Weiden, M Whitehead, J Wicht, G Wilkinson, M Wilkinson, M Williams, MP Williams, M Williams, T Williams, FF Wilson, J Wimberley, J Wishahi, W Wislicki, M Witek, G Wormser, SA Wotton, K Wraight, S Wright, K Wyllie, Y Xie, Z Xu, Z Yang, H Yin, J Yu, X Yuan, O Yushchenko, M Zangoli, M Zavertyaev, L Zhang, Y Zhang, A Zhelezov, Y Zheng, A Zhokhov, L Zhong, V Zhukov, S Zucchelli
Abstract:
A binned Dalitz plot analysis of the decays $B^0 \to D K^{\ast 0}$, with $D
\to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0} K^{+} K^{-}$, is performed to
measure the observables $x_\pm$ and $y_\pm$, which are related to the CKM angle
$\gamma$ and the hadronic parameters of the decays. The $D$ decay strong phase
variation over the Dalitz plot is taken from measurements performed at the
CLEO-c experiment, making the analysis independent of the $D$ decay model. With
a sample of proton-proton collision data, corresponding to an integrated
luminosity of $3.0\,\rm{fb}^{-1}$, collected by the LHCb experiment, the values
of the $CP$ violation parameters are found to be $x_+ = 0.05 \pm 0.35 \pm
0.02$, $x_-=-0.31\pm 0.20 \pm 0.04$, $y_+=-0.81\pm 0.28\pm 0.06$ and
$y_-=0.31\pm 0.21 \pm 0.05$, where the first uncertainties are statistical and
the second systematic. These observables correspond to values $\gamma$ = $(71
\pm 20)^\circ$, $r_{B^0} = 0.56\pm 0.17$ and $\delta_{B^0} =
(204\,^{+21}_{-20})^\circ$. The parameters $r_{B^0}$ and $\delta_{B^0}$ are the
magnitude ratio and strong phase difference between the suppressed and favoured
$B^0$ decay amplitudes, and have been measured in a region of $\pm 50$
MeV/$c^2$ around the $K^{\ast}(892)^{0}$ mass and with the magnitude of the
cosine of the $K^{\ast}(892)^{0}$ helicity angle larger than 0.4.
