1. Observation of the suppressed $Λ_b^0\to D p K^-$ decay with $D\to K^+ π^-$ and measurement of its $C\!P$ asymmetry
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collaboration, LHCb, Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellán, Gallego, FJ Abudinen, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Albero, A Alfonso, Aliouche, Z, Alkhazov, G, Cartelle, P Alvarez, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andreianov, A, Andreotti, M, Archilli, F, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Bachmayer, M, Back, JJ, Rodriguez, P Baladron, Balagura, V, Baldini, W, Leite, J Baptista, Barbetti, M, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Basels, JM, Bashir, S, Bassi, G, Batsukh, B, Battig, A, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Belavin, V, Belin, S, Bellee, V, Belous, K, Belov, I, Belyaev, I, Bencivenni, G, Ben-Haim, E, Berezhnoy, A, Bernet, R, Berninghoff, D, Bernstein, HC, Bertella, C, Bertolin, A, Betancourt, C, Betti, F, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bian, L, Bieker, MS, Bifani, S, Billoir, P, Birch, M, Bishop, FCR, Bitadze, A, Bizzeti, A, Bjørn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Boelhauve, JA, Garcia, O Boente, Boettcher, T, Boldyrev, A, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Borsuk, JT, Bouchiba, SA, Bowcock, TJV, Boyer, A, Bozzi, C, Bradley, MJ, Braun, S, Rodriguez, A Brea, Brodski, M, Brodzicka, J, Gonzalo, A Brossa, Brundu, D, Buonaura, A, Buonincontri, L, Burke, AT, Burr, C, Bursche, A, Butkevich, A, Butter, JS, Buytaert, J, Byczynski, W, Cadeddu, S, Cai, H, Calabrese, R, Calefice, L, Diaz, L Calero, Cali, S, Calladine, R, Calvi, M, Gomez, M Calvo, Magalhaes, P Camargo, Campana, P, Quezada, AF Campoverde, Capelli, S, Capriotti, L, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carli, I, Carniti, P, Carus, L, Akiba, K Carvalho, Vidal, A Casais, Casse, G, Cattaneo, M, Cavallero, G, Celani, S, Cerasoli, J, Cervenkov, D, Chadwick, AJ, Chapman, MG, Charles, M, Charpentier, Ph, Chatzikonstantinidis, G, Barajas, CA Chavez, Chefdeville, M, Chen, C, Chen, S, Chernov, A, Chobanova, V, Cholak, S, Chrzaszcz, M, Chubykin, A, Chulikov, V, Ciambrone, P, Cicala, MF, Vidal, X Cid, Ciezarek, G, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Cobbledick, JL, Coco, V, Coelho, JAB, Cogan, J, Cogneras, E, Cojocariu, L, Collins, P, Colombo, T, Congedo, L, Contu, A, Cooke, N, Coombs, G, Corredoira, I, Corti, G, Sobral, CM Costa, Couturier, B, Craik, DC, Crkovská, J, Torres, M Cruz, Currie, R, Silva, CL Da, Dadabaev, S, Dai, L, Dall'Occo, E, Dalseno, J, D'Ambrosio, C, Danilina, A, d'Argent, P, Davies, JE, Davis, A, Francisco, O De Aguiar, Bruyn, K De, Capua, S De, Cian, M De, Miranda, JM De, Paula, L De, Serio, M De, Simone, D De, Simone, P De, Vries, JA de, Dean, CT, Decamp, D, Dedu, V, Buono, L Del, Delaney, B, Dembinski, H-P, Dendek, A, Denysenko, V, Derkach, D, Deschamps, O, Desse, F, Dettori, F, Dey, B, Cicco, A Di, Nezza, P Di, Didenko, S, Maronas, L Dieste, Dijkstra, H, Dobishuk, V, Dong, C, Donohoe, AM, Dordei, F, Reis, AC dos, Douglas, L, Dovbnya, A, Downes, AG, Dudek, MW, Dufour, L, Duk, V, Durante, P, Durham, JM, Dutta, D, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Ek-In, S, Eklund, L, Ely, S, Ene, A, Epple, E, Escher, S, Eschle, J, Esen, S, Evans, T, Falabella, A, Fan, J, Fan, Y, Fang, B, Farry, S, Fazzini, D, Féo, M, Prieto, A Fernandez, Fernez, AD, Ferrari, F, Lopes, L Ferreira, Rodrigues, F Ferreira, Sole, S Ferreres, Ferrillo, M, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiorini, M, Firlej, M, Fischer, KM, Fitzgerald, DS, Fitzpatrick, C, Fiutowski, T, Fkiaras, A, Fleuret, F, Fontana, M, Fontanelli, F, Forty, R, Foulds-Holt, D, Lima, V Franco, Sevilla, M Franco, Frank, M, Franzoso, E, Frau, G, Frei, C, Friday, DA, Fu, J, Fuehring, Q, Gabriel, E, Torreira, A Gallas, Galli, D, Gambetta, S, Gan, Y, Gandelman, M, Gandini, P, Gao, Y, Garau, M, Martin, LM Garcia, Moreno, P Garcia, Pardiñas, J García, Plana, B Garcia, Rosales, FA Garcia, Garrido, L, Gaspar, C, Geertsema, RE, Gerick, D, Gerken, LL, Gersabeck, E, Gersabeck, M, Gershon, T, Gerstel, D, Ghez, Ph, Giambastiani, L, Gibson, V, Giemza, HK, Gilman, AL, Giovannetti, M, Gioventù, A, Gironell, P Gironella, Giubega, L, Giugliano, C, Gizdov, K, Gkougkousis, EL, Gligorov, VV, Göbel, C, Golobardes, E, Golubkov, D, Golutvin, A, Gomes, A, Fernandez, S Gomez, Abrantes, F Goncalves, Goncerz, M, Gong, G, Gorbounov, P, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Grammatico, T, Cardoso, LA Granado, Graugés, E, Graverini, E, Graziani, G, Grecu, A, Greeven, LM, Grieser, NA, Grillo, L, Gromov, S, Cazon, BR Gruberg, Gu, C, Guarise, M, Guittiere, M, Günther, PA, Gushchin, E, Guth, A, Guz, Y, Gys, T, Hadavizadeh, T, Haefeli, G, Haen, C, Haimberger, J, Halewood-leagas, T, Hamilton, PM, Hammerich, JP, Han, Q, Han, X, Hancock, TH, Hansmann-Menzemer, S, Harnew, N, Harrison, T, Hasse, C, Hatch, M, He, J, Hecker, M, Heijhoff, K, 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GJ, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, A, Lampis, A, Lancierini, D, Lane, JJ, Lane, R, Lanfranchi, G, Langenbruch, C, Langer, J, Lantwin, O, Latham, T, Lazzari, F, Gac, R Le, Lee, SH, Lefèvre, R, Leflat, A, Legotin, S, Leroy, O, Lesiak, T, Leverington, B, Li, H, Li, P, Li, S, Li, Y, Li, Z, Liang, X, Lin, T, Lindner, R, Lisovskyi, V, Litvinov, R, Liu, G, Liu, H, Liu, Q, Liu, S, Salvia, A Lobo, Loi, A, Castro, J Lomba, Longstaff, I, Lopes, JH, Solino, S Lopez, Lovell, GH, Lu, Y, Lucarelli, C, Lucchesi, D, Luchuk, S, Martinez, M Lucio, Lukashenko, V, Luo, Y, Lupato, A, Luppi, E, Lupton, O, Lusiani, A, Lyu, X, Ma, L, Ma, R, Maccolini, S, Machefert, F, Maciuc, F, Macko, V, Mackowiak, P, Maddrell-Mander, S, Madejczyk, O, Mohan, LR Madhan, Maev, O, Maevskiy, A, Maisuzenko, D, Majewski, MW, Malczewski, JJ, Malde, S, Malecki, B, Malinin, A, Maltsev, T, Malygina, H, Manca, G, Mancinelli, G, Manuzzi, D, Marangotto, D, Maratas, J, Marchand, JF, Marconi, U, Mariani, S, Benito, C Marin, Marinangeli, M, Marks, J, Marshall, AM, Marshall, PJ, Martelli, G, Martellotti, G, Martinazzoli, L, Martinelli, M, Santos, D Martinez, Vidal, F Martinez, Massafferri, A, Materok, M, Matev, R, Mathad, A, Mathe, Z, Matiunin, V, Matteuzzi, C, Mattioli, KR, Mauri, A, Maurice, E, Mauricio, J, Mazurek, M, McCann, M, Mcconnell, L, Mcgrath, TH, Mchugh, NT, McNab, A, McNulty, R, Mead, JV, Meadows, B, Meier, G, Meinert, N, Melnychuk, D, Meloni, S, Merk, M, Merli, A, Garcia, L Meyer, Mikhasenko, M, Milanes, DA, Millard, E, Milovanovic, M, Minard, M-N, Minotti, A, Minzoni, L, Mitchell, SE, Mitreska, B, Mitzel, DS, Mödden, A, Mohammed, RA, Moise, RD, Mokhnenko, S, Mombächer, T, Monroy, IA, Monteil, S, Morandin, M, Morello, G, Morello, MJ, Moron, J, Morris, AB, Morris, AG, Mountain, R, Mu, H, Muheim, F, Mulder, M, Müller, D, Müller, K, Murphy, CH, Murray, D, Muzzetto, P, Naik, P, Nakada, T, Nandakumar, R, Nanut, T, Nasteva, I, Needham, M, Neri, I, Neri, N, Neubert, S, Neufeld, N, Newcombe, R, 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D, Popov, S, Poslavskii, S, Prasanth, K, Promberger, L, Prouve, C, Pugatch, V, Puill, V, Pullen, H, Punzi, G, Qi, H, Qian, W, Qin, J, Qin, N, Quagliani, R, Quintana, B, Raab, NV, Trejo, RI Rabadan, Rachwal, B, Rademacker, JH, Rama, M, Pernas, M Ramos, Rangel, MS, Ratnikov, F, Raven, G, Reboud, M, Redi, F, Reiss, F, Alepuz, C Remon, Ren, Z, Renaudin, V, Ribatti, R, Ricciardi, S, Rinnert, K, Robbe, P, Robertson, G, Rodrigues, AB, Rodrigues, E, Lopez, JA Rodriguez, Rodriguez, ERR Rodriguez, Roehrken, M, Rollings, A, Roloff, P, Romanovskiy, V, Lamas, M Romero, Vidal, A Romero, Roth, JD, Rotondo, M, Rudolph, MS, Ruf, T, Fernandez, RA Ruiz, Vidal, J Ruiz, Ryzhikov, A, Ryzka, J, Silva, JJ Saborido, Sagidova, N, Sahoo, N, Saitta, B, Salomoni, M, Gras, C Sanchez, Santacesaria, R, Rios, C Santamarina, Santimaria, M, Santovetti, E, Saranin, D, Sarpis, G, Sarpis, M, Sarti, A, Satriano, C, Satta, A, Saur, M, Savrina, D, Sazak, H, Smead, LG Scantlebury, Scarabotto, A, Schael, S, Scherl, S, Schiller, 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High Energy Physics::Phenomenology ,High Energy Physics::Experiment - Abstract
A study of $\Lambda_b^0$ baryon decays to the $DpK^-$ final state is presented based on a proton-proton collision data sample corresponding to an integrated luminosity of 9 fb$^{-1}$ collected with the LHCb detector. Two $\Lambda_b^0$ decays are considered, $\Lambda_b^0\to DpK^-$ with $D\to K^-\pi^+$ and $D\to K^+\pi^-$, where $D$ represents a superposition of $D^0$ and $\overline{D}^0$ states. The latter process is expected to be suppressed relative to the former, and is observed for the first time. The ratio of branching fractions of the two decays is measured, and the $C\!P$ asymmetry of the suppressed mode, which is sensitive to the CKM angle $\gamma$, is also reported.
- Published
- 2021