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.

Aaij, R., Abdelmotteleb, A., Beteta, C.a., Abudinen, F., Ackernley, T., Adeva, B., et al. (2022). Observation of the decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu)over-bar(tau). PHYSICAL REVIEW LETTERS, 128(19) [10.1103/PhysRevLett.128.191803].

Observation of the decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu)over-bar(tau)

Archilli, F.;Santovetti, E.
Membro del Collaboration Group
;
2022-01-01

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.
2022
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Aaij, R., Abdelmotteleb, A., Beteta, C.a., Abudinen, F., Ackernley, T., Adeva, B., et al. (2022). Observation of the decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu)over-bar(tau). PHYSICAL REVIEW LETTERS, 128(19) [10.1103/PhysRevLett.128.191803].
Aaij, R; Abdelmotteleb, Asw; Beteta, Ca; Abudinen, F; Ackernley, T; Adeva, B; Adinolfi, M; Afsharnia, H; Agapopoulou, C; Aidala, Ca; Aiola, S; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Alfonso Albero, A; Aliouche, Z; Alkhazov, G; Cartelle, Pa; 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, Jb; 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, I; Bhasin, S; Bhom, J; Bian, L; Bieker, Ms; Biesuz, N; V, ; 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, Tj; V, ; Boyer, A; Bozzi, C; Bradley, Mj; Braun, S; Brea Rodriguez, A; Brodzicka, J; Gonzalo, Ab; 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, Mc; Magalhaes, Pc; Campana, P; Quezada, Afc; Capelli, S; Capriotti, L; Carbone, A; Carboni, G; Cardinale, R; Cardini, A; Carli, I; Carniti, P; Carus, L; Akiba, Kc; Casais Vidal, A; Caspary, R; Casse, G; Cattaneo, M; Cavallero, G; Celani, S; Cerasoli, J; Cervenkov, D; Chadwick, Aj; Chapman, Mg; Charles, M; Charpentier, P; Barajas, Cac; Chefdeville, M; Chen, C; Chen, S; Chernov, A; Chobanova, V; Cholak, S; Chrzaszcz, M; Chubykin, A; Chulikov, V; Ciambrone, P; Cicala, Mf; Vidal, Xc; Ciezarek, G; Clarke, Pel; Clemencic, M; Cliff, H; V, ; 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, Cmc; Couturier, B; Craik, Dc; Crkovska, J; Torres, Mc; 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, Oda; De Bruyn, K; De Capua, S; De Cian, M; Carneiro Da Graca, Udf; 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; 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, Vf; Sevilla, Mf; 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, Fg; Goncerz, M; Gong, G; Gorbounov, P; Gorelov, I; V, ; Gotti, C; Grabowski, Jp; Grammatico, T; Cardoso, Lag; Grauges, E; Graverini, E; Graziani, G; Grecu, A; Greeven, Lm; Grieser, Na; Grillo, L; Gromov, S; Cazon, Brg; 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; 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; 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; 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, Shk; 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, Ml; 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, Lrm; 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, Cm; 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, J; V, ; Meadows, B; Meier, G; Melnychuk, D; Meloni, S; Merk, M; Merli, A; Garcia, Lm; Mikhasenko, M; Milanes, Da; Millard, E; Milovanovic, M; Minard, M; 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, Mp; 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, Mp; Polci, F; Lener, Mp; 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, Rir; Rachwal, B; Rademacker, Jh; Rajagopalan, R; Rama, M; Pernas, Mr; 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, Jr; Ryzhikov, A; Ryzka, J; Saborido Silva, Jj; Sagidova, N; Sahoo, N; Saitta, B; Salomoni, M; Gras, Cs; 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, Lgs; 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, Mh; Schwemmer, R; Sciascia, B; Sellam, S; Semennikov, A; Soares, Ms; Sergi, A; Serra, N; Sestini, L; Seuthe, A; Shang, Y; Shangase, Dm; Shapkin, M; Shchemerov, I; Shchutska, L; Shears, T; Shekhtman, L; Shen, Z; Sheng, S; Shevchenko, V; Shields, Eb; Shimizu, Y; Shmanin, E; Shupperd, Jd; Siddi, Bg; Coutinho, Rs; 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, Ls; Sokoloff, Md; Soler, Fjp; Solovev, A; Solovyev, I; Souza De Almeida, Fl; De Paula, Bs; Spaan, B; Norella, Es; 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, Pn; Swientek, K; Szabelski, A; Szumlak, T; Szymanski, M; Taneja, S; Tanner, Ar; Tat, Md; Terentev, A; Teubert, F; Thomas, E; Thompson, Djd; Thomson, Ka; Tilquin, H; Tisserand, V; T'Jampens, S; Tobin, M; Tomassetti, L; Tong, X; Machado, Dt; Tou, Dy; Trifonova, E; Trilov, Sm; Trippl, C; Tuci, G; Tully, A; Tuning, N; Ukleja, A; Unverzagt, Dj; Ursov, E; Usachov, A; Ustyuzhanin, A; Uwer, U; Vagner, A; Vagnoni, V; Valassi, A; Valenti, G; Canudas, Nv; van Beuzekom, M; Van Dijk, M; Van Hecke, H; van Herwijnen, E; van Veghel, M; Vazquez Gomez, R; Vazquez Regueiro, P; Vazquez Sierra, C; Vecchi, S; Velthuis, Jj; Veltri, M; Venkateswaran, A; Veronesi, M; Vesterinen, M; Vieira, D; Diaz, Mv; Viemann, H; Vilasis-Cardona, X; Figueras, Ev; Villa, A; Vincent, P; Volle, Fc; 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; Zunica, G
Articolo su rivista
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/316541
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 43
  • ???jsp.display-item.citation.isi??? 16
social impact