Observation of the decay Λ_b⁰ → Λ_c⁺p(p)over-barπ^-

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Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albicocco, R, Albrecht, J, Alessio, F, Alexander, M, Albero, A Alfonso et al (show 781 more authors) , Ali, S, Alkhazov, G, Cartelle, R Alvarez, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d'Argent, R, Romeu, J Arnau, Artamonov, A, Artuso, M, Aslanides, E, Atzeni, M, Auriemma, G, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barsuk, S, Barter, W, Baryshnikov, F, Batozskaya, V, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bershyiko, Ia, Bifani, S, Billoir, R, Birnkraut, A, Bizzeti, A, Bjorn, M, Blake, T, Blanc, F, Blusk, S, Bocci, V, Garcia, O Boente, Boettcher, T, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Bossu, F, Boubdir, M, Bowcock, TJV ORCID: 0000-0002-3505-6915, Bowen, E, Bozzi, C, Braun, S, Brodski, M, Brodzicka, J, Brundu, D, Buchanan, E, Burr, C, Bursche, A, Buytaert, J, Byczynski, W, Cadeddu, S, Cai, H, Calabrese, R, Calladine, R, Calvi, M, Gomez, M Calvo, Camboni, A, Campana, R, Perez, DH Campora, Capriotti, L, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carniti, R, Carson, L, Akiba, K Carvalho, Casse, G ORCID: 0000-0002-8516-237X, Cassina, L, Cattaneo, M, Cavallero, G, Cenci, R, Chamont, D, Chapman, MG, Charles, M, Charpentier, Ph, Chatzikonstantinidis, G, Chefdeville, M, Chen, S, Chitic, S-G, Chobanova, V, Chrzaszcz, M, Chubykin, A, Ciambrone, R, Vidal, X Cid, Ciezarek, G, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Coco, V, Cogan, J, Cogneras, E, Cogoni, V, Cojocariu, L, Collins, R, Colombo, T, Comerma-Montells, A, Contu, A, Coombs, G, Coquereau, S, Corti, G, Corvo, M, Sobral, CM Costa, Couturier, B, Cowan, GA, Craik, DC, Crocombe, A, Torres, M Cruz, Currie, R, D'Ambrosio, C, Marinho, F Da Cunha, Da Silva, CL, Dall'Occo, E, Dalseno, J, Danilina, A, Davis, A, Francisco, O De Aguiar, De Bruyn, K, De Capua, S, De Cian, M, De Miranda, JM, De Paula, L, De Serio, M, De Simone, R, Dean, CT, Decamp, D, Del Buono, L, Delaney, B, Dembinski, H-R, Demmer, M, Dendek, A, Derkach, D, Deschamps, O, Dettori, F, Dey, B, Di Canto, A, Di Nezza, R, Didenko, S, Dijkstra, H, Dordei, F, Dorigo, M, Suarez, A Dosil, Douglas, L, Dovbnya, A, Dreimanis, K, Dufour, L, Dujany, G, Durante, R, Durham, JM, Dutta, D, Dzhelyadin, R, Dziewiecki, M, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Eitschberger, U, Ekelhof, R, Eklund, L, Ely, S, Ene, A, Escher, S, Esen, S, Evans, HM, Evans, T, Falabella, A, Farley, N, Farry, S, Fazzini, D, Federici, L, Fernandez, G, Declara, R Fernandez, Prieto, A Fernandez, Ferrari, F, Lopes, L Ferreira, Rodrigues, F Ferreira, 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F, Lener, M Poli, Poluektov, A, Polukhina, N, Polyakov, I, Polycarpo, E, Pomery, GJ, Ponce, S, Popov, A, Popov, D, Poslayskii, S, Potterat, C, Price, E, Prisciandaro, J, Prouve, C, Pugatch, V, Navarro, A Puig, Pullen, H, Punzi, G, Qian, W, Qin, J, Quagliani, R, Quintana, B, Rachwal, B, Rademackers, JH, Rama, M, Pernas, M Ramos, Rangel, MS, Ratnikov, F, Raven, G, Salzgeber, M Ravonel, Reboud, M, Redi, F, Reichert, S, dos Reis, AC, Remon Alepuz, C, Renaudin, V, Ricciardi, S, Richards, S, Rinnert, K, Robbe, R, Robert, A, Rodrigues, AB, Rodrigues, E, Lopez, JA Rodriguez, Rogozhnikov, A, Roiser, S, Rollings, A, Romanovskiy, V, Romero Vidal, A, Rotondo, M, Rudolph, MS, Ruf, T, Vidal, J Ruiz, Silva, JJ Saborido, Sagidova, N, Saitta, B, Salustino Guimaraes, V, Sanchez Mayordomo, C, Sedes, B Sanmartin, Santacesaria, R, Santamarina Rios, C, Santimaria, M, Santovetti, E, Sarpis, G, Sarti, A, Satriano, C, Satta, A, Saunders, DM, Savrina, D, Schael, S, Schellenberg, M, Schiller, M, Schindler, H, Schmelling, M, Schmelzer, T, Schmidt, B, Schneider, O, Schopper, A, Schreiner, HF, Schubiger, M, Schune, MH, Schwemmer, R, Sciascia, B, Sciubba, A, Semennikov, A, Sepulveda, ES, Sergi, A, Serra, N, Serrano, J, Sestini, L, Seyfert, R, Shapkin, M, Shcheglov, Y, Shears, T ORCID: 0000-0002-2653-1366, Shekhtman, L, Shevchenko, V, Siddi, BG, Coutinho, R Silva, de Oliveira, L Silva, Simi, G, Simone, S, Skidmore, N, Skwarnicki, T, Smith, IT, Smith, M, Soares Lavra, I, Sokoloff, MD, Soler, FJP, De Paula, B Souza, Spaan, B, Spradlin, R, Stagni, F, Stahl, M, Stahl, S, Stefko, R, Steflova, S, Steinkamp, O, Stemmle, S, Stenyakin, O, Stepanova, M, Stevens, H, Stone, S, Storaci, B, Stracka, S, Stramaglia, ME, Straticiuc, M, Straumann, U, Strokov, S, Sun, J, Sun, L, Swientek, K, Syropoulos, V, Szumlak, T, Szymanski, M, T'Jampens, S, Tang, Z, Tayduganov, A, Tekampe, T, Tellarini, G, Teubert, F, Thomas, E, van Tilburg, J, Tilley, MJ, Tisserand, V, Tobin, M, Tolk, S, Tomassetti, L, Tonelli, D, Aoude, R Tourinho Jadallah, Tournefier, E, Traill, M, Tran, MT, Tresch, M, Trisovic, A, Tsaregorodtsev, A, Tully, A, Tuning, N, Ukleja, A, Usachov, A, Ustyuzhanin, A, Uwer, U, Vacca, C, Vagner, A, Vagnoni, V, Valassi, A, Valat, S, Valenti, G, Vazquez Gomez, R, Vazquez Regueiro, R, Vecchi, S, van Veghel, M, Velthuis, JJ, Veltri, M, Veneziano, G, Venkateswaran, A, Verlage, TA, Vernet, M, Vesterinen, M, Viana Barbosa, JV, Vieira, D, Vieites Diaz, M, Viemann, H, Vilasis-Cardona, X, Vitkovskiy, A, Vitti, M, Volkov, V, Vollhardt, A, Voneki, B, Vorobyev, A, Vorobyev, V, Voss, C, de Vries, JA, Vazquez Sierra, C, Waldi, R, Walsh, J, Wang, J, Wang, M, Wang, Y, Wang, Z, Ward, DR, Wark, HM, Watson, NK, Websdale, D, Weiden, A, Weisser, C, Whitehead, M, Wicht, J, Wilkinson, G, Wilkinson, M, Williams, MRJ, Williams, M, Williams, T, Wilson, FF, Wimberley, J, Winn, M, Wishahi, J, Wislicki, W, Witek, M, Wormser, G, Wotton, SA, Wyllie, K, Xiao, D, Xie, Y, Xu, A, Xu, M, Xu, Q, Xu, Z, Xu, Z, Yang, Z, Yang, Z, Yao, Y, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zarebski, KA, Zavertyaev, M, Zhang, L, Zhang, Y, Zhelezov, A, Zheng, Y, Zhu, X, Zhukov, V, Zonneveld, JB and Zucchelli, S (2018) Observation of the decay Λ_b⁰ → Λ_c⁺p(p)over-barπ^- PHYSICS LETTERS B, 784. pp. 101-111. ISSN 0370-2693, 1873-2445

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Abstract

The decay $Λ_b^0 \to Λ_c^+ p \overline{p} π^-$ is observed using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of $\sqrt{s}=$ 7 and 8 TeV, corresponding to an integrated luminosity of 3 $fb^{-1}$. The ratio of branching fractions between $Λ_b^0 \to Λ_c^+ p \overline{p} π^-$ and $Λ_b^0 \to Λ_c^+ π^-$ decays is measured to be \begin{equation*} \frac{\mathcal{B}(Λ_b^0 \to Λ_c^+ p \overline{p}π^-)}{\mathcal{B}(Λ_b^0 \to Λ_c^+ π^-)} = 0.0540 \pm 0.0023 \pm 0.0032. \end{equation*} Two resonant structures are observed in the $ Λ_c^+ π^-$ mass spectrum of the ${Λ_b^0 \to Λ_c^+ p\overline{p} π^-}$ decays, corresponding to the $Σ_c(2455)^0$ and $Σ_c^{*}(2520)^0$ states. The ratios of branching fractions with respect to the decay $Λ_b^0 \to Λ_c^+ p \overline{p} π^-$ are \begin{align*} \frac{\mathcal{B}(Λ_b^0 \to Σ_c^0 p\overline{p})\times\mathcal{B}(Σ_c^0\to Λ_c^+ π^-)}{\mathcal{B}(Λ_b^0 \to Λ_c^+ p \overline{p}π^-)} = 0.089\pm0.015\pm0.006, \frac{\mathcal{B}(Λ_b^0 \to Σ_c^{*0} p\overline{p})\times\mathcal{B}(Σ_c^{*0}\to Λ_c^+ π^-)}{\mathcal{B}(Λ_b^0 \to Λ_c^+ p \overline{p}π^-)} = 0.119\pm0.020\pm0.014. \end{align*} In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

Item Type:	Article
Additional Information:	All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-005.html
Uncontrolled Keywords:	hep-ex, hep-ex
Depositing User:	Symplectic Admin
Date Deposited:	03 Dec 2018 10:13
Last Modified:	21 Apr 2026 20:35
DOI:	10.1016/j.physletb.2018.07.033
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3029303
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