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Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA et al (show 998 more authors) , Aiola, S, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Aliouche, Z, Alkhazov, G, Cartelle, P Alvarez, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andersson, M, Andreianov, A, Andreotti, M, Archilli, F, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Bachmayer, M, Back, JJ, Baladron Rodriguez, P, Balagura, V, Baldini, W, de Souza 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, Biesuz, NV, Bifani, S, Billoir, P, Biolchini, A, Birch, M, Bishop, FCR, Bitadze, A, Bizzeti, A, Bjorn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Boelhauve, JA, Boente Garcia, O, 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, Brea Rodriguez, A, 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, 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, Casais Vidal, A, Caspary, R, Casse, G 
ORCID: 0000-0002-8516-237X, Cattaneo, M, Cavallero, G, Celani, S, Cerasoli, J, Cervenkov, D, Chadwick, AJ, Chapman, MG, Charles, M, Charpentier, Ph, 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, Crkovska, J, Torres, M Cruz, Currie, R, Da Silva, CL, Dadabaev, S, Dai, L, Dall'Occo, E, Dalseno, J, D'Ambrosio, C, Danilina, A, D'Argent, P, Dashkina, A, Davies, JE, Davis, A, Francisco, O De Aguiar, De Bruyn, K, De Capua, S, De Cian, M, Carneiro Da Graca, U De Freitas, De Lucia, E, De Miranda, JM, De Paula, L, De Serio, M, De Simone, D, De Simone, P, De Vellis, F, de Vries, JA, Dean, CT, Debernardis, F, Decamp, D, Dedu, V, Del Buono, L, Delaney, B, Dembinski, H-P, Denysenko, V, Derkach, D, Deschamps, O, Dettori, F, Dey, B, Di Cicco, A, Di Nezza, P, Didenko, S, Dieste Maronas, L, Dijkstra, H, Dobishuk, V, Dong, C, Donohoe, AM, Dordei, F, dos Reis, AC, 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, Falcao, LN, Fan, Y, Fang, B, Farry, S, Fazzini, D, Feo, M, Fernandez Prieto, A, Fernez, AD, Ferrari, F, Ferreira Lopes, L, Ferreira Rodrigues, F, Ferreres Sole, S, 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, Galati, G, Gallas Torreira, A, Galli, D, Gambetta, S, Gan, Y, Gandelman, M, Gandini, P, Gao, Y, Garau, M, Garcia Martin, LM, Garcia Moreno, P, Garcia Pardinas, J, Garcia Plana, B, Garcia Rosales, FA, Garrido, L, Gaspar, C, Geertsema, RE, Gerick, D, Gerken, LL, Gersabeck, E, Gersabeck, M, Gershon, T, Gerstel, D, Giambastiani, L, Gibson, V, Giemza, HK, Gilman, AL, Giovannetti, M, Gioventu, A, Gironella Gironell, P, Giugliano, C, Gizdov, K, Gkougkousis, EL, Gligorov, VV, Gobel, C, Golobardes, E, Golubkov, D, Golutvin, A, Gomes, A, Gomez Fernandez, S, Abrantes, F Goncalves, Goncerz, M, Gong, G, Gorbounov, P, Gorelov, IV, Gotti, C, Grabowski, JP, Grammatico, T, Cardoso, LA Granado, Grauges, E, Graverini, E, Graziani, G, Grecu, A, Greeven, LM, Grieser, NA, Grillo, L, Gromov, S, Cazon, BR Gruberg, Gu, C, Guarise, M, Guittiere, M, Gunther, PA, Gushchin, E, Guth, A, Guz, Y, Gys, T, Hadavizadeh, T, Haefeli, G, Haen, C, Haimberger, J, Haines, SC, Halewood-leagas, T, Hamilton, PM, Hammerich, JP ORCID: 0000-0002-5556-1775, Han, Q, Han, X, Hansen, EB, Hansmann-Menzemer, S, Harnew, N, Harrison, T, Hasse, C, Hatch, M, He, J, Hecker, M, Heijhoff, K, Heinicke, K, Henderson, RDL, Hennequin, AM, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, Heuel, J, Hicheur, A, Hill, D, Hilton, M, Hollitt, SE, Hou, R, Hou, Y, Hu, J, Hu, J, Hu, W, Hu, X, Huang, W, Huang, X, Hulsbergen, W, Hunter, RJ, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Hynds, D, Ibis, P, Idzik, M, Ilin, D, Ilten, P, Inglessi, A, Ishteev, A, Ivshin, K, Jacobsson, R, Jage, H, Jakobsen, S, Jans, E, Jashal, BK, Jawahery, A, Jevtic, V, Jiang, X, John, M, Johnson, D, Jones, CR, Jones, TP, Jost, B, Jurik, N, Kadavath, SH Kalavan, Kandybei, S, Kang, Y, Karacson, M, Karpenkov, D, Karpov, M, Kautz, JW, Keizer, F, Keller, DM, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Kholodenko, S, Kirn, T, Kirsebom, VS, Kitouni, O, Klaver, S, Kleijne, N, Klimaszewski, K, Kmiec, MR, Koliiev, S, Kondybayeva, A, Konoplyannikov, A, Kopciewicz, P, Kopecna, R, Koppenburg, P, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kozachuk, A, Kravchenko, P, Kravchuk, L, Krawczyk, RD, Kreps, M, Kretzschmar, S, Krokovny, P, Krupa, W, Krzemien, W, Kubat, J, Kucharczyk, M, Kudryavtsev, V, Kuindersma, HS, Kunde, 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, Le Gac, R, Lee, SH, Lefevre, 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, Lobo Salvia, A, Loi, A, Lollini, R, Lomba Castro, J, Longstaff, I, Lopes, JH, Lopez Solino, S, 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, Martinez Santos, D, Martinez Vidal, F, Massafferri, A, Materok, M, Matev, R, Mathad, A, 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, Melnychuk, D, Meloni, S, Merk, M, Merli, A, Garcia, L Meyer, Mikhasenko, M, Milanes, DA, Millard, E, Milovanovic, M, Minard, M-N, Minotti, A, Mitchell, SE, Mitreska, B, Mitzel, DS, Modden, A, Mohammed, RA, Moise, RD, Mokhnenko, S, Mombacher, 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, Muller, K, Murphy, CH, Murray, D, Murta, R, Muzzetto, P, Naik, P, Nakada, T, Nandakumar, R, Nanut, T, Nasteva, I, Needham, M, Neri, N, Neubert, S, Neufeld, N, Newcombe, R, Niel, EM, Nieswand, S, Nikitin, N, Nolte, NS, Normand, C, Nunez, C, Oblakowska-Mucha, A, Obraztsov, V, Oeser, T, O'Hanlon, DP, Okamura, S, Oldeman, R, Oliva, F, Olivares, ME, Onderwater, CJG, O'Neil, RH, Otalora Goicochea, JM, Ovsiannikova, T, Owen, P, Oyanguren, A, Ozcelik, O, Padeken, KO, Pagare, B, Pais, PR, Pajero, T, Palano, A, Palutan, M, Pan, Y, Panshin, G, Papanestis, A, Pappagallo, M, Pappalardo, LL, Pappenheimer, C, Parker, W, Parkes, C, Passalacqua, B, Passaleva, G, Pastore, A, Patel, M, Patrignani, C, Pawley, CJ, Pearce, A, Pellegrino, A, Altarelli, M Pepe, Perazzini, S, Pereima, D, Pereiro Castro, A, Perret, P, Petric, M, Petridis, K, Petrolini, A, Petrov, A, Petrucci, S, Petruzzo, M, Pham, TTH, Philippov, A, Piandani, R, Pica, L, Piccini, M, Pietrzyk, B, Pietrzyk, G, Pili, M, Pinci, D, Pisani, F, Pizzichemi, M, Resmi, PK, Placinta, V, Plews, J, Casasus, M Plo, Polci, F, Lener, M Poli, Poliakova, M, Poluektov, A, Polukhina, N, Polyakov, I, Polycarpo, E, Ponce, S, Popov, D, Popov, S, Poslavskii, S, Prasanth, K, Promberger, L, Prouve, C, Pugatch, V, Puill, V, Punzi, G, Qi, H, Qian, W, Qin, N, Quagliani, R, Raab, NV, Trejo, RI Rabadan, Rachwal, B, Rademacker, JH, Rajagopalan, R, Rama, M, Pernas, M Ramos, Rangel, MS, Ratnikov, F, Raven, G, Reboud, M, Redi, F, Reiss, F, Remon Alepuz, C, Ren, Z, Renaudin, V, Ribatti, R, Ricci, AM, Ricciardi, S, Rinnert, K, Robbe, P, Robertson, G, Rodrigues, AB, Rodrigues, E, Rodriguez Lopez, JA, Rodriguez Rodriguez, ERR, Rollings, A, Roloff, P, Romanovskiy, V, Romero Lamas, M, Romero Vidal, A, Roth, JD, Rotondo, M, Rudolph, MS, Ruf, T, Ruiz Fernandez, RA, Vidal, J Ruiz, Ryzhikov, A, Ryzka, J, Saborido Silva, JJ, Sagidova, N, Sahoo, N, Saitta, B, Salomoni, M, Gras, C Sanchez, Santacesaria, R, Santamarina Rios, C, 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 ORCID: 0000-0003-0528-2724, Schiller, M, Schindler, H, Schmelling, M, Schmidt, B, Schmitt, S, Schneider, O, Schopper, A, Schubiger, M, Schulte, S, Schune, MH, Schwemmer, R, Sciascia, B, Sellam, S, Semennikov, A, Soares, M Senghi, Sergi, A, Serra, N, Sestini, L, Seuthe, A, Shang, Y, Shangase, DM, Shapkin, M, Shchemerov, I, Shchutska, L, Shears, T ORCID: 0000-0002-2653-1366, Shekhtman, L, Shen, Z, Sheng, S, Shevchenko, V, Shields, EB, Shimizu, Y, Shmanin, E, Shupperd, JD, Siddi, BG, Coutinho, R Silva, Simi, G, Simone, S, Skidmore, N, Skuza, R, Skwarnicki, T, Slater, MW, Slazyk, I, Smallwood, JC, Smeaton, JG, Smith, E, Smith, M, Snoch, A, Lavra, L Soares, Sokoloff, MD, Soler, FJP, Solovev, A, Solovyev, I, Souza De Almeida, FL, De Paula, B Souza, 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Vom Bruch, D, Vorobyev, A, Vorobyev, V, Voropaev, N, Vos, K, Waldi, R, Walsh, J, Wang, C, Wang, J, Wang, J, Wang, J, Wang, J, Wang, M, Wang, R, Wang, Y, Wang, Z, Wang, Z, Wang, Z, Ward, JA, Watson, NK, Websdale, D, Weisser, C, Westhenry, BDC, White, DJ, Whitehead, M, Wiederhold, AR, Wiedner, D, Wilkinson, G, Wilkinson, MK, Williams, I, Williams, M, Williams, MRJ, Wilson, FF, Wislicki, W, Witek, M, Witola, L, Wormser, G, Wotton, SA, Wu, H, Wyllie, K, Xiang, Z, Xiao, D, Xie, Y, Xu, A, Xu, J, Xu, L, Xu, M, Xu, Q, Xu, Z, Xu, Z, Yang, D, Yang, S, Yang, Y, Yang, Z, Yang, Z, Yao, Y, Yeomans, LE, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zaffaroni, E, Zavertyaev, M, Zdybal, M, Zenaiev, O, Zeng, M, Zhang, D, Zhang, L, Zhang, S, Zhang, S, Zhang, Y, Zhang, Y, Zharkova, A, Zhelezov, A, Zheng, Y, Zhou, T, Zhou, X, Zhou, Y, Zhovkovska, V, Zhu, X, Zhu, X, Zhu, Z, Zhukov, V, Zou, Q, Zucchelli, S, Zuliani, D and Zunica, G
(2022)
Observation of the Decay Λ<i><sub>b</sub></i><SUP>0</SUP> → Λ<i><sub>c</sub></i><SUP>+</SUP> τ<SUP>-</SUP>(ν)over-bar<sub>τ</sub>.
PHYSICAL REVIEW LETTERS, 128 (19).
191803-.
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Abstract
The first observation of the semileptonic b-baryon decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb^{-1} of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ^{-} lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})/B(Λ_{b}^{0}→Λ_{c}^{+}π^{-}π^{+}π^{-}) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λ_{b}^{0}→Λ_{c}^{+}π^{-}π^{+}π^{-}. The ratio of semileptonic branching fractions R(Λ_{c}^{+})≡B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})/B(Λ_{b}^{0}→Λ_{c}^{+}μ^{-}ν[over ¯]_{μ}) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λ_{b}^{0}→Λ_{c}^{+}μ^{-}ν[over ¯]_{μ} contributes to the last term. This result is in agreement with the standard model prediction.
Dimensions
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