Observation of the Decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu)over-bar(tau) [Observation of the Decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}]

Aaij, R.; Abdelmotteleb, A.S.W.; Beteta, C.A.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Albero, A.A.; Aliouche, Z.; Alkhazov, G.; Cartelle, P.A.; Amato, S.; Amey, J.L.; 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, J.J.; Rodriguez, P.B.; Balagura, V.; Baldini, W.; Baptista de Souza Leite, J.; Barbetti, M.; Barlow, R.J.; Barsuk, S.; Barter, W.; Bartolini, M.; Baryshnikov, F.; Basels, J.M.; 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, H.C.; Bertella, C.; Bertolin, A.; Betancourt, C.; Betti, F.; Bezshyiko, I.; Bhasin, S.; Bhom, J.; Bian, L.; Bieker, M.S.; Biesuz, N.V.; Bifani, S.; Billoir, P.; Biolchini, A.; Birch, M.; Bishop, F.C.R.; Bitadze, A.; Bizzeti, A.; Bjørn, M.; Blago, M.P.; Blake, T.; Blanc, F.; Blusk, S.; Bobulska, D.; Boelhauve, J.A.; Garcia, O.B.; Boettcher, T.; Boldyrev, A.; Bondar, A.; Bondar, N.; Borghi, S.; Borisyak, M.; Borsato, M.; Borsuk, J.T.; Bouchiba, S.A.; Bowcock, T.J.V.; Boyer, A.; Bozzi, C.; Bradley, M.J.; Braun, S.; Rodriguez, A.B.; Brodzicka, J.; Gonzalo, A.B.; Brundu, D.; Buonaura, A.; Buonincontri, L.; Burke, A.T.; Burr, C.; Bursche, A.; Butkevich, A.; Butter, J.S.; Buytaert, J.; Byczynski, W.; Cadeddu, S.; Cai, H.; Calabrese, R.; Calefice, L.; Cali, S.; Calladine, R.; Calvi, M.; Gomez, M.C.; Magalhaes, P.C.; Campana, P.; Quezada, A.F.C.; Capelli, S.; Capriotti, L.; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carli, I.; Carniti, P.; Carus, L.; Akiba, K.C.; Vidal, A.C.; Caspary, R.; Casse, G.; Cattaneo, M.; Cavallero, G.; Celani, S.; Cerasoli, J.; Cervenkov, D.; Chadwick, A.J.; Chapman, M.G.; Charles, M.; Charpentier, P.; Barajas, C.A.C.; Chefdeville, M.; Chen, C.; Chen, S.; Chernov, A.; Chobanova, V.; Cholak, S.; Chrzaszcz, M.; Chubykin, A.; Chulikov, V.; Ciambrone, P.; Cicala, M.F.; Vidal, X.C.; Ciezarek, G.; Clarke, P.E.L.; Clemencic, M.; Cliff, H.V.; Closier, J.; Cobbledick, J.L.; Coco, V.; Coelho, J.A.B.; Cogan, J.; Cogneras, E.; Cojocariu, L.; Collins, P.; Colombo, T.; Congedo, L.; Contu, A.; Cooke, N.; Coombs, G.; Corredoira, I.; Corti, G.; Sobral, C.M.C.; Couturier, B.; Craik, D.C.; Crkovská, J.; Torres, M.C.; Currie, R.; Da Silva, C.L.; Dadabaev, S.; Dai, L.; Dall'Occo, E.; Dalseno, J.; D'Ambrosio, C.; Danilina, A.; D'Argent, P.; Dashkina, A.; Davies, J.E.; Davis, A.; Francisco, O.D.A.; De Bruyn, K.; De Capua, S.; De Cian, M.; Da Graca, U.D.F.C.; De Lucia, E.; De Miranda, J.M.; De Paula, L.; De Serio, M.; De Simone, D.; De Simone, P.; De Vellis, F.; de Vries, J.A.; Dean, C.T.; Debernardis, F.; Decamp, D.; Dedu, V.; Del Buono, L.; Delaney, B.; Dembinski, H.; Denysenko, V.; Derkach, D.; Deschamps, O.; Dettori, F.; Dey, B.; Di Cicco, A.; Di Nezza, P.; Didenko, S.; Maronas, L.D.; Dijkstra, H.; Dobishuk, V.; Dong, C.; Donohoe, A.M.; Dordei, F.; Dos Reis, A.C.; Douglas, L.; Dovbnya, A.; Downes, A.G.; Dudek, M.W.; Dufour, L.; Duk, V.; Durante, P.; Durham, J.M.; 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, L.N.; Fan, Y.; Fang, B.; Farry, S.; Fazzini, D.; Féo, M.; Prieto, A.F.; Fernez, A.D.; Ferrari, F.; Lopes, L.F.; Rodrigues, F.F.; Sole, S.F.; Ferrillo, M.; Ferro-Luzzi, M.; Filippov, S.; Fini, R.A.; Fiorini, M.; Firlej, M.; Fischer, K.M.; Fitzgerald, D.S.; Fitzpatrick, C.; Fiutowski, T.; Fkiaras, A.; Fleuret, F.; Fontana, M.; Fontanelli, F.; Forty, R.; Foulds-Holt, D.; Lima, V.F.; Sevilla, M.F.; Frank, M.; Franzoso, E.; Frau, G.; Frei, C.; Friday, D.A.; Fu, J.; Fuehring, Q.; Gabriel, E.; Galati, G.; Torreira, A.G.; Galli, D.; Gambetta, S.; Gan, Y.; Gandelman, M.; Gandini, P.; Gao, Y.; Garau, M.; Martin, L.M.G.; Moreno, P.G.; García Pardiñas, J.; Plana, B.G.; Rosales, F.A.G.; Garrido, L.; Gaspar, C.; Geertsema, R.E.; Gerick, D.; Gerken, L.L.; Gersabeck, E.; Gersabeck, M.; Gershon, T.; Gerstel, D.; Giambastiani, L.; Gibson, V.; Giemza, H.K.; Gilman, A.L.; Giovannetti, M.; Gioventù, A.; Gironell, P.G.; Giugliano, C.; Gizdov, K.; Gkougkousis, E.L.; Gligorov, V.V.; Göbel, C.; Golobardes, E.; Golubkov, D.; Golutvin, A.; Gomes, A.; Fernandez, S.G.; Abrantes, F.G.; Goncerz, M.; Gong, G.; Gorbounov, P.; Gorelov, I.V.; Gotti, C.; Grabowski, J.P.; Grammatico, T.; Cardoso, L.A.G.; Graugés, E.; Graverini, E.; Graziani, G.; Grecu, A.; Greeven, L.M.; Grieser, N.A.; Grillo, L.; Gromov, S.; Cazon, B.R.G.; Gu, C.; Guarise, M.; Guittiere, M.; Günther, P.A.; Gushchin, E.; Guth, A.; Guz, Y.; Gys, T.; Hadavizadeh, T.; Haefeli, G.; Haen, C.; Haimberger, J.; Haines, S.C.; Halewood-Leagas, T.; Hamilton, P.M.; Hammerich, J.P.; Han, Q.; Han, X.; Hansen, E.B.; Hansmann-Menzemer, S.; Harnew, N.; Harrison, T.; Hasse, C.; Hatch, M.; He, J.; Hecker, M.; Heijhoff, K.; Heinicke, K.; Henderson, R.D.L.; Hennequin, A.M.; Hennessy, K.; Henry, L.; Heuel, J.; Hicheur, A.; Hill, D.; Hilton, M.; Hollitt, S.E.; Hou, R.; Hou, Y.; Hu, J.; Hu, J.; Hu, W.; Hu, X.; Huang, W.; Huang, X.; Hulsbergen, W.; Hunter, R.J.; Hushchyn, M.; Hutchcroft, D.; 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, B.K.; Jawahery, A.; Jevtic, V.; Jiang, X.; John, M.; Johnson, D.; Jones, C.R.; Jones, T.P.; Jost, B.; Jurik, N.; Kadavath, S.H.K.; Kandybei, S.; Kang, Y.; Karacson, M.; Karpenkov, D.; Karpov, M.; Kautz, J.W.; Keizer, F.; Keller, D.M.; Kenzie, M.; Ketel, T.; Khanji, B.; Kharisova, A.; Kholodenko, S.; Kirn, T.; Kirsebom, V.S.; Kitouni, O.; Klaver, S.; Kleijne, N.; Klimaszewski, K.; Kmiec, M.R.; 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, R.D.; Kreps, M.; Kretzschmar, S.; Krokovny, P.; Krupa, W.; Krzemien, W.; Kubat, J.; Kucharczyk, M.; Kudryavtsev, V.; Kuindersma, H.S.; Kunde, G.J.; Kvaratskheliya, T.; Lacarrere, D.; Lafferty, G.; Lai, A.; Lampis, A.; Lancierini, D.; Lane, J.J.; Lane, R.; Lanfranchi, G.; Langenbruch, C.; Langer, J.; Lantwin, O.; Latham, T.; Lazzari, F.; Le Gac, R.; Lee, S.H.; 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.L.; Loi, A.; Lollini, R.; Castro, J.L.; Longstaff, I.; Lopes, J.H.; Soliño, S.L.; Lovell, G.H.; Lu, Y.; Lucarelli, C.; Lucchesi, D.; Luchuk, S.; Martinez, M.L.; 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, L.R.M.; Maev, O.; Maevskiy, A.; Maisuzenko, D.; Majewski, M.W.; Malczewski, J.J.; Malde, S.; Malecki, B.; Malinin, A.; Maltsev, T.; Malygina, H.; Manca, G.; Mancinelli, G.; Manuzzi, D.; Marangotto, D.; Maratas, J.; Marchand, J.F.; Marconi, U.; Mariani, S.; Benito, C.M.; Marinangeli, M.; Marks, J.; Marshall, A.M.; Marshall, P.J.; Martelli, G.; Martellotti, G.; Martinazzoli, L.; Martinelli, M.; Santos, D.M.; Vidal, F.M.; Massafferri, A.; Materok, M.; Matev, R.; Mathad, A.; Matiunin, V.; Matteuzzi, C.; Mattioli, K.R.; Mauri, A.; Maurice, E.; Mauricio, J.; Mazurek, M.; Mccann, M.; Mcconnell, L.; Mcgrath, T.H.; Mchugh, N.T.; Mcnab, A.; Mcnulty, R.; Mead, J.V.; Meadows, B.; Meier, G.; Melnychuk, D.; Meloni, S.; Merk, M.; Merli, A.; Garcia, L.M.; Mikhasenko, M.; Milanes, D.A.; Millard, E.; Milovanovic, M.; Minard, M.; 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doi:10.1103/PhysRevLett.128.191803

The first observation of the semileptonic b-baryon decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau) with a significance of 6.1 sigma, 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 tau(-) lepton is reconstructed in the hadronic decay to three charged pions. The ratio K = B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau))/B(Lambda(0)(b) -> Lambda(+)(c)pi(-)pi(+)pi(-)) is measured to be 2.46 +/- 0.27 +/- 0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau)) (1.50 +/- 0.16 +/- 0.25 +/- 0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Lambda(0)(b) -> Lambda(+)(c)pi(-)pi(+)pi(-). The ratio of semileptonic branching fractions R(Lambda(+)(c)) B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau))/B(Lambda(0)(b) -> Lambda(+)(c)mu(-)(nu) over bar (tau)) is derived to be 0.242 +/- 0.026 +/- 0.040 +/- 0.059, where the external branching fraction uncertainty from the channel Lambda(0)(b) -> Lambda(+)(c)mu(-)(nu) over bar (tau) contributes to the last term. This result is in agreement with the standard model prediction.

Observation of the Decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu)over-bar(tau) [Observation of the Decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}] / R. Aaij, A.S.W. Abdelmotteleb, C.A. Beteta, F. Abudinén, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Agapopoulou, C.A. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A.A. Albero, Z. Aliouche, G. Alkhazov, P.A. Cartelle, S. Amato, J.L. Amey, Y. Amhis, L. An, L. Anderlini, M. Andersson, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J.J. Back, P.B. Rodriguez, V. Balagura, W. Baldini, J. Baptista de Souza Leite, M. Barbetti, R.J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J.M. Basels, S. Bashir, G. Bassi, B. Batsukh, A. Battig, A. Bay, A. Beck, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H.C. Bernstein, C. Bertella, A. Bertolin, C. Betancourt, F. Betti, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M.S. Bieker, N.V. Biesuz, S. Bifani, P. Billoir, A. Biolchini, M. Birch, F.C.R. Bishop, A. Bitadze, A. Bizzeti, M. Bjørn, M.P. Blago, T. Blake, F. Blanc, S. Blusk, D. Bobulska, J.A. Boelhauve, O.B. Garcia, T. Boettcher, A. Boldyrev, A. Bondar, N. Bondar, S. Borghi, M. Borisyak, M. Borsato, J.T. Borsuk, S.A. Bouchiba, T.J.V. Bowcock, A. Boyer, C. Bozzi, M.J. Bradley, S. Braun, A.B. Rodriguez, J. Brodzicka, A.B. Gonzalo, D. Brundu, A. Buonaura, L. Buonincontri, A.T. Burke, C. Burr, A. Bursche, A. Butkevich, J.S. Butter, J. Buytaert, W. Byczynski, S. Cadeddu, H. Cai, R. Calabrese, L. Calefice, S. Cali, R. Calladine, M. Calvi, M.C. Gomez, P.C. Magalhaes, P. Campana, A.F.C. Quezada, S. Capelli, L. Capriotti, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, I. Carli, P. Carniti, L. Carus, K.C. Akiba, A.C. Vidal, R. Caspary, G. Casse, M. Cattaneo, G. Cavallero, S. Celani, J. Cerasoli, D. Cervenkov, A.J. Chadwick, M.G. Chapman, M. Charles, P. Charpentier, C.A.C. Barajas, M. Chefdeville, C. Chen, S. Chen, A. Chernov, V. Chobanova, S. Cholak, M. Chrzaszcz, A. Chubykin, V. Chulikov, P. Ciambrone, M.F. Cicala, X.C. Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, J.L. Cobbledick, V. Coco, J.A.B. Coelho, J. Cogan, E. Cogneras, L. Cojocariu, P. Collins, T. Colombo, L. Congedo, A. Contu, N. Cooke, G. Coombs, I. Corredoira, G. Corti, C.M.C. Sobral, B. Couturier, D.C. Craik, J. Crkovská, M.C. Torres, R. Currie, C.L. Da Silva, S. Dadabaev, L. Dai, E. Dall'Occo, J. Dalseno, C. D'Ambrosio, A. Danilina, P. D'Argent, A. Dashkina, J.E. Davies, A. Davis, O.D.A. Francisco, K. De Bruyn, S. De Capua, M. De Cian, U.D.F.C. Da Graca, E. De Lucia, J.M. De Miranda, L. De Paula, M. De Serio, D. De Simone, P. De Simone, F. De Vellis, J.A. de Vries, C.T. Dean, F. Debernardis, D. Decamp, V. Dedu, L. Del Buono, B. 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Observation of the Decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu)over-bar(tau) [Observation of the Decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}]

Aaij, R;Abdelmotteleb, A S W;Beteta, C Abellán;Abudinén, F;Ackernley, T;Adeva, B;Adinolfi, M;Afsharnia, H;Agapopoulou, C;Aidala, C A;S. Aiola^{Membro del Collaboration Group};Ajaltouni, Z;Akar, S;Albrecht, J;Alessio, F;Alexander, M;Albero, A Alfonso;Aliouche, Z;Alkhazov, G;Cartelle, P Alvarez;Amato, S;Amey, J L;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, J J;Rodriguez, P Baladron;Balagura, V;Baldini, W;Baptista de Souza Leite, J;Barbetti, M;Barlow, R J;Barsuk, S;Barter, W;Bartolini, M;Baryshnikov, F;Basels, J M;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, H C;Bertella, C;Bertolin, A;Betancourt, C;Betti, F;Bezshyiko, Ia;Bhasin, S;Bhom, J;Bian, L;Bieker, M S;Biesuz, N V;Bifani, S;Billoir, P;Biolchini, A;Birch, M;Bishop, F C R;Bitadze, A;Bizzeti, A;Bjørn, M;Blago, M P;Blake, T;Blanc, F;Blusk, S;Bobulska, D;Boelhauve, J A;Garcia, O Boente;Boettcher, T;Boldyrev, A;Bondar, A;Bondar, N;Borghi, S;Borisyak, M;Borsato, M;Borsuk, J T;Bouchiba, S A;Bowcock, T J V;Boyer, A;Bozzi, C;Bradley, M J;Braun, S;Rodriguez, A Brea;Brodzicka, J;Gonzalo, A Brossa;Brundu, D;Buonaura, A;Buonincontri, L;Burke, A T;Burr, C;Bursche, A;Butkevich, A;Butter, J S;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, A F 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;Caspary, R;Casse, G;Cattaneo, M;Cavallero, G;Celani, S;Cerasoli, J;Cervenkov, D;Chadwick, A J;Chapman, M G;Charles, M;Charpentier, Ph;Barajas, C A Chavez;Chefdeville, M;Chen, C;Chen, S;Chernov, A;Chobanova, V;Cholak, S;Chrzaszcz, M;Chubykin, A;Chulikov, V;Ciambrone, P;Cicala, M F;Vidal, X Cid;Ciezarek, G;Clarke, P E L;Clemencic, M;Cliff, H V;Closier, J;Cobbledick, J L;Coco, V;Coelho, J A B;Cogan, J;Cogneras, E;Cojocariu, L;Collins, P;Colombo, T;Congedo, L;Contu, A;Cooke, N;Coombs, G;Corredoira, I;Corti, G;Sobral, C M Costa;Couturier, B;Craik, D C;Crkovská, J;Torres, M Cruz;Currie, R;Da Silva, C L;Dadabaev, S;Dai, L;Dall'Occo, E;Dalseno, J;D'Ambrosio, C;Danilina, A;d'Argent, P;Dashkina, A;Davies, J E;Davis, A;Francisco, O De Aguiar;De Bruyn, K;De Capua, S;De Cian, M;Da Graca, U De Freitas Carneiro;De Lucia, E;De Miranda, J M;De Paula, L;De Serio, M;De Simone, D;De Simone, P;De Vellis, F;de Vries, J A;Dean, C T;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;Maronas, L Dieste;Dijkstra, H;Dobishuk, V;Dong, C;Donohoe, A M;Dordei, F;Dos Reis, A C;Douglas, L;Dovbnya, A;Downes, A G;Dudek, M W;Dufour, L;Duk, V;Durante, P;Durham, J M;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, L N;Fan, Y;Fang, B;Farry, S;Fazzini, D;Féo, M;Prieto, A Fernandez;Fernez, A D;Ferrari, F;Lopes, L Ferreira;Rodrigues, F Ferreira;Sole, S Ferreres;Ferrillo, M;Ferro-Luzzi, M;Filippov, S;Fini, R A;Fiorini, M;Firlej, M;Fischer, K M;Fitzgerald, D S;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, D A;Fu, J;Fuehring, Q;Gabriel, E;Galati, G;Torreira, A Gallas;Galli, D;Gambetta, S;Gan, Y;Gandelman, M;P. Gandini^{Membro del Collaboration Group};Gao, Y;Garau, M;Martin, L M Garcia;Moreno, P Garcia;García Pardiñas, J;Plana, B Garcia;Rosales, F A Garcia;Garrido, L;Gaspar, C;Geertsema, R E;Gerick, D;Gerken, L L;Gersabeck, E;Gersabeck, M;Gershon, T;Gerstel, D;Giambastiani, L;Gibson, V;Giemza, H K;Gilman, A L;Giovannetti, M;Gioventù, A;Gironell, P Gironella;Giugliano, C;Gizdov, K;Gkougkousis, E L;Gligorov, V V;Göbel, C;Golobardes, E;Golubkov, D;Golutvin, A;Gomes, A;Fernandez, S Gomez;Abrantes, F Goncalves;Goncerz, M;Gong, G;Gorbounov, P;Gorelov, I V;Gotti, C;Grabowski, J P;Grammatico, T;Cardoso, L A Granado;Graugés, E;Graverini, E;Graziani, G;Grecu, A;Greeven, L M;Grieser, N A;Grillo, L;Gromov, S;Cazon, B R Gruberg;Gu, C;Guarise, M;Guittiere, M;Günther, P A;Gushchin, E;Guth, A;Guz, Y;Gys, T;Hadavizadeh, T;Haefeli, G;Haen, C;Haimberger, J;Haines, S C;Halewood-Leagas, T;Hamilton, P M;Hammerich, J P;Han, Q;Han, X;Hansen, E B;Hansmann-Menzemer, S;Harnew, N;Harrison, T;Hasse, C;Hatch, M;He, J;Hecker, M;Heijhoff, K;Heinicke, K;Henderson, R D L;Hennequin, A M;Hennessy, K;L. Henry^{Membro del Collaboration Group};Heuel, J;Hicheur, A;Hill, D;Hilton, M;Hollitt, S E;Hou, R;Hou, Y;Hu, J;Hu, J;Hu, W;Hu, X;Huang, W;Huang, X;Hulsbergen, W;Hunter, R J;Hushchyn, M;Hutchcroft, D;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, B K;Jawahery, A;Jevtic, V;Jiang, X;John, M;Johnson, D;Jones, C R;Jones, T P;Jost, B;Jurik, N;Kadavath, S H Kalavan;Kandybei, S;Kang, Y;Karacson, M;Karpenkov, D;Karpov, M;Kautz, J W;Keizer, F;Keller, D M;Kenzie, M;Ketel, T;Khanji, B;Kharisova, A;Kholodenko, S;Kirn, T;Kirsebom, V S;Kitouni, O;Klaver, S;Kleijne, N;Klimaszewski, K;Kmiec, M R;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, R D;Kreps, M;Kretzschmar, S;Krokovny, P;Krupa, W;Krzemien, W;Kubat, J;Kucharczyk, M;Kudryavtsev, V;Kuindersma, H S;Kunde, G J;Kvaratskheliya, T;Lacarrere, D;Lafferty, G;Lai, A;Lampis, A;Lancierini, D;Lane, J J;Lane, R;Lanfranchi, G;Langenbruch, C;Langer, J;Lantwin, O;Latham, T;Lazzari, F;Le Gac, R;Lee, S H;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;Lollini, R;Castro, J Lomba;Longstaff, I;Lopes, J H;Soliño, S López;Lovell, G H;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, L R Madhan;Maev, O;Maevskiy, A;Maisuzenko, D;Majewski, M W;Malczewski, J J;Malde, S;Malecki, B;Malinin, A;Maltsev, T;Malygina, H;Manca, G;Mancinelli, G;Manuzzi, D;D. Marangotto^{Membro del Collaboration Group};Maratas, J;Marchand, J F;Marconi, U;Mariani, S;Benito, C Marin;Marinangeli, M;Marks, J;Marshall, A M;Marshall, P J;Martelli, G;Martellotti, G;Martinazzoli, L;Martinelli, M;Santos, D Martinez;Vidal, F Martinez;Massafferri, A;Materok, M;Matev, R;Mathad, A;Matiunin, V;Matteuzzi, C;Mattioli, K R;Mauri, A;Maurice, E;Mauricio, J;Mazurek, M;McCann, M;Mcconnell, L;Mcgrath, T H;Mchugh, N T;McNab, A;McNulty, R;Mead, J V;Meadows, B;Meier, G;Melnychuk, D;Meloni, S;Merk, M;A. Merli;Garcia, L Meyer;Mikhasenko, M;Milanes, D A;Millard, E;Milovanovic, M;Minard, M-N;Minotti, A;Mitchell, S E;Mitreska, B;Mitzel, D S;Mödden, A;Mohammed, R A;Moise, R D;Mokhnenko, S;Mombächer, T;Monroy, I A;Monteil, S;Morandin, M;Morello, G;Morello, M J;Moron, J;Morris, A B;Morris, A G;Mountain, R;Mu, H;Muheim, F;Mulder, M;Müller, K;Murphy, C H;Murray, D;Murta, R;Muzzetto, P;Naik, P;Nakada, T;Nandakumar, R;Nanut, T;Nasteva, I;Needham, M;N. Neri^{Membro del Collaboration Group};Neubert, S;Neufeld, N;Newcombe, R;Niel, E M;Nieswand, S;Nikitin, N;Nolte, N S;Normand, C;Nunez, C;Oblakowska-Mucha, A;Obraztsov, V;Oeser, T;O'Hanlon, D P;Okamura, S;Oldeman, R;Oliva, F;Olivares, M E;Onderwater, C J G;O'Neil, R H;Goicochea, J M Otalora;Ovsiannikova, T;Owen, P;Oyanguren, A;Ozcelik, O;Padeken, K O;Pagare, B;Pais, P R;Pajero, T;Palano, A;Palutan, M;Pan, Y;Panshin, G;Papanestis, A;Pappagallo, M;Pappalardo, L L;Pappenheimer, C;Parker, W;Parkes, C;Passalacqua, B;Passaleva, G;Pastore, A;Patel, M;Patrignani, C;Pawley, C J;Pearce, A;Pellegrino, A;Altarelli, M Pepe;Perazzini, S;Pereima, D;Castro, A Pereiro;Perret, P;Petric, M;Petridis, K;Petrolini, A;Petrov, A;Petrucci, S;M. Petruzzo^{Membro del Collaboration Group};Pham, T T H;Philippov, A;Piandani, R;Pica, L;Piccini, M;Pietrzyk, B;Pietrzyk, G;Pili, M;Pinci, D;Pisani, F;Pizzichemi, M;Resmi, P K;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, N V;Trejo, R I Rabadan;Rachwal, B;Rademacker, J H;Rajagopalan, R;Rama, M;Pernas, M Ramos;Rangel, M S;Ratnikov, F;Raven, G;Reboud, M;Redi, F;Reiss, F;Alepuz, C Remon;Ren, Z;Renaudin, V;Ribatti, R;Ricci, A M;Ricciardi, S;Rinnert, K;Robbe, P;Robertson, G;Rodrigues, A B;Rodrigues, E;Lopez, J A Rodriguez;Rodriguez, E R R Rodriguez;Rollings, A;Roloff, P;Romanovskiy, V;Lamas, M Romero;Vidal, A Romero;Roth, J D;Rotondo, M;Rudolph, M S;Ruf, T;Fernandez, R A Ruiz;Vidal, J Ruiz;Ryzhikov, A;Ryzka, J;Silva, J J 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, L G Scantlebury;Scarabotto, A;Schael, S;Scherl, S;Schiller, M;Schindler, H;Schmelling, M;Schmidt, B;Schmitt, S;Schneider, O;Schopper, A;Schubiger, M;Schulte, S;Schune, M H;Schwemmer, R;Sciascia, B;Sellam, S;Semennikov, A;Soares, M Senghi;Sergi, A;Serra, N;Sestini, L;Seuthe, A;Shang, Y;Shangase, D M;Shapkin, M;Shchemerov, I;Shchutska, L;Shears, T;Shekhtman, L;Shen, Z;Sheng, S;Shevchenko, V;Shields, E B;Shimizu, Y;Shmanin, E;Shupperd, J D;Siddi, B G;Coutinho, R Silva;Simi, G;Simone, S;Skidmore, N;Skuza, R;Skwarnicki, T;Slater, M W;Slazyk, I;Smallwood, J C;Smeaton, J G;Smith, E;Smith, M;Snoch, A;Lavra, L Soares;Sokoloff, M D;Soler, F J P;Solovev, A;Solovyev, I;De Almeida, F L Souza;De Paula, B Souza;Spaan, B;Norella, E Spadaro;Spradlin, P;Stagni, F;Stahl, M;Stahl, S;Stanislaus, S;Steinkamp, O;Stenyakin, O;Stevens, H;Stone, S;Strekalina, D;Suljik, F;Sun, J;Sun, L;Sun, Y;Svihra, P;Swallow, P N;Swientek, K;Szabelski, A;Szumlak, T;Szymanski, M;Taneja, S;Tanner, A R;Tat, M D;Terentev, A;Teubert, F;Thomas, E;Thompson, D J D;Thomson, K A;Tilquin, H;Tisserand, V;T'Jampens, S;Tobin, M;Tomassetti, L;Tong, X;Machado, D Torres;Tou, D Y;Trifonova, E;Trilov, S M;Trippl, C;Tuci, G;Tully, A;Tuning, N;Ukleja, A;Unverzagt, D J;Ursov, E;Usachov, A;Ustyuzhanin, A;Uwer, U;Vagner, A;Vagnoni, V;Valassi, A;Valenti, G;Canudas, N Valls;van Beuzekom, M;Van Dijk, M;Van Hecke, H;van Herwijnen, E;van Veghel, M;Gomez, R Vazquez;Regueiro, P Vazquez;Sierra, C Vázquez;Vecchi, S;Velthuis, J J;Veltri, M;Venkateswaran, A;Veronesi, M;Vesterinen, M;Vieira, D;Diaz, M Vieites;Viemann, H;Vilasis-Cardona, X;Figueras, E Vilella;Villa, A;Vincent, P;Volle, F C;Bruch, D Vom;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, J A;Watson, N K;Websdale, D;Weisser, C;Westhenry, B D C;White, D J;Whitehead, M;Wiederhold, A R;Wiedner, D;Wilkinson, G;Wilkinson, M K;Williams, I;Williams, M;Williams, M R J;Wilson, F F;Wislicki, W;Witek, M;Witola, L;Wormser, G;Wotton, S A;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, L E;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;Zunica, G

2022

Abstract

The first observation of the semileptonic b-baryon decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau) with a significance of 6.1 sigma, 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 tau(-) lepton is reconstructed in the hadronic decay to three charged pions. The ratio K = B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau))/B(Lambda(0)(b) -> Lambda(+)(c)pi(-)pi(+)pi(-)) is measured to be 2.46 +/- 0.27 +/- 0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau)) (1.50 +/- 0.16 +/- 0.25 +/- 0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Lambda(0)(b) -> Lambda(+)(c)pi(-)pi(+)pi(-). The ratio of semileptonic branching fractions R(Lambda(+)(c)) B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau))/B(Lambda(0)(b) -> Lambda(+)(c)mu(-)(nu) over bar (tau)) is derived to be 0.242 +/- 0.026 +/- 0.040 +/- 0.059, where the external branching fraction uncertainty from the channel Lambda(0)(b) -> Lambda(+)(c)mu(-)(nu) over bar (tau) contributes to the last term. This result is in agreement with the standard model prediction.

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				Settore FIS/01 - Fisica Sperimentale
			
	Data di pubblicazione
	
				13-mag-2022
			
	Rivista in ANCE
	
				PHYSICAL REVIEW LETTERS
			
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				https://dx.doi.org/10.1103/PhysRevLett.128.191803
			
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/940650

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