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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 834 more authors) , Alexander, M, Albero, A Alfonso, Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barrand, GC, Barsuk, S, Barter, W, Bartolini, M, baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, 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, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bifani, S, Billoir, P, Birnkraut, A, Bizzeti, A, Bjorn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Bocci, V, Boente Garcia, O, Boettcher, T, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Bossu, F, Boubdir, M, Bowcock, TJV 
ORCID: 0000-0002-3505-6915, Bozzi, C, Braun, S, Brodski, M, Brodzicka, J, Gonzalo, A Brossa, Brundu, D, Buchanan, E, Buonaura, A, Burr, C, Bursche, A, Buytaert, J, Byczynski, W, Cadeddu, S, Cai, H, Calabrese, R, Calladine, R, Calvi, M, Calvo Gomez, M, Camboni, A, Campana, P, Perez, DH Campora, Capriotti, L, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carniti, P, Carvalho Akiba, K, 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, Chekalina, V, Chen, C, Chen, S, Chitic, S-G, Chobanova, V, Chrzaszcz, M, Chubykin, A, Ciambrone, P, Cid Vidal, X, Ciezarek, G, Cindolo, F, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Coco, V, Coelho, JAB, Cogan, J, Cogneras, E, Cojocariu, L, Collins, P, 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, Cruz Torres, M, Currie, R, D'Ambrosio, C, Da Cunha Marinho, F, 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, P, Dean, CT, Decamp, D, Del Buono, L, Delaney, B, Dembinski, H-P, Demmer, M, Dendek, A, Derkach, D, Deschamps, O, Desse, F, Dettori, F, Dey, B, Di Canto, A, Di Nezza, P, Didenko, S, Dijkstra, H, Dordei, F, Dorigo, M, Dosil Suarez, A, Douglas, L, Dovbnya, A, Dreimanis, K, Dufour, L, Dujany, G, Durante, P, 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, T, Falabella, A, Farley, N, Farry, S, Fazzini, D, Declara, P Fernandez, Fernandez Prieto, A, Ferrari, F, Lopes, L Ferreira, Ferreira Rodrigues, F, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiorini, M, Firlej, M, Fitzpatrick, C, Fiutowski, T, Fleuret, F, Fontana, M, Fontanelli, F, Forty, R, Lima, V Franco, Frank, M, Frei, C, Fu, J, Funk, W, Farber, C, Feo, M, Gabriel, E, Gallas Torreira, A, Galli, D, Gallorini, S, Gambetta, S, Gan, Y, Gandelman, M, Gandini, P, Gao, Y, Garcia Martin, LM, Garcia Plana, B, Pardinas, J Garcia, Tico, J Garra, Garrido, L, Gascon, D, Gaspar, C, Gavardi, L, Gazzoni, G, Gerick, D, Gersabeck, E, Gersabeck, M, Gershon, T, Gerstel, D, Ghez, Ph, Gibson, V, Girard, OG, Gironella Gironell, P, Giubega, L, Gizdov, K, Gligorov, VV, Golubkov, D, Golutvin, A, Gomes, A, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Graciani Diaz, R, Cardoso, LA Granado, Grauges, E, Graverini, E, Graziani, G, Grecu, A, Greim, R, Griffith, P, Grillo, L, Gruber, L, Cazon, BR Gruberg, Gruenberg, O, Gu, C, Gushchin, E, Guth, A, Guz, Yu, Gys, T, Gobel, C, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haines, SC, Hamilton, B, Han, X, Hancock, TH, Hansmann-Menzemer, S, Harnew, N, Harrison, T, Hasse, C, Hatch, M, He, J, Hecker, M, Heinicke, K, Heister, A, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, van Herwijnen, E, Heuel, J, Hess, M, Hicheur, A, Charman, R Hidalgo, Hill, D, Hilton, M, Hopchev, PH, Hu, J, Hu, W, Huang, W, Huard, ZC, Hulsbergen, W, Humair, T, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Hynds, D, Ibis, P, Idzik, M, Ilten, P, Inglessi, A, Inyakin, A, Ivshin, K, Jacobsson, R, Jalocha, J, Jans, E, Jashal, BK, Jawahery, A, Jiang, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Karacson, M, Kariuki, JM, Karodia, S, Kazeev, N, Kecke, M, Keizer, F, Kelsey, M, Kenzie, M, Ketel, T, Khairullin, E, Khanji, B, Khurewathanakul, C, Kim, KE, Kirn, T, Kirsebom, VS, Klaver, S, Klimaszewski, K, Klimkovich, T, Koliiev, S, Kolpin, M, Kopecna, R, Koppenburg, P, Kostiuk, I, Kotriakhova, S, Kozeiha, M, Kravchuk, L, Kreps, M, Kress, F, Krokovny, P, Krupa, W, Krzemien, W, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kuonen, AK, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, A, Lancierini, D, Lanfranchi, G, Langenbruch, C, Latham, T, Lazzeroni, C, Le Gac, R, At, Le, Lefevre, R, Lemaitre, F, Leroy, O, Lesiak, T, Leverington, B, Li, P-R, Li, Y, Li, Z, Liang, X, Likhomanenko, T, Lindner, R, Lionetto, F, Lisovskyi, V, Liu, G, Liu, X, Loh, D, Loi, A, Longstaff, I, Lopes, JH, Lovell, GH, Lucchesi, D, Lucio Martinez, M, Lupato, A, Luppi, E, Lupton, O, Lusiani, A, Lyu, X, Machefert, F, Maciuc, F, Macko, V, Mackowiak, P, Maddrell-Mander, S, Maev, O, Maguire, K, Maisuzenko, D, Majewski, MW, Malde, S, Malecki, B, Malinin, A, Maltsev, T, Manca, G, Mancinelli, G, Marangotto, D, Maratas, J, Marchand, JF, Marconi, U, Benito, C Marin, Marinangeli, M, Marino, P, Marks, J, Marshall, PJ, Martellotti, G, Martinelli, M, Martinez Santos, D, Martinez Vidal, F, Massafferri, A, Materok, M, Matev, R, Mathad, A, Mathe, Z, Matteuzzi, C, Mauri, A, Maurice, E, Maurin, B, McCann, M, Mcnab, A, McNulty, R, Mead, JV ORCID: 0000-0003-0875-2533, Meadows, B, Meaux, C, Meinert, N, Melnychuk, D, Merk, M, Merli, A, Michielin, E, Milanes, DA, Millard, E, Minard, M-N, Minzoni, L, Mitzel, DS, Mogini, A, Moise, RD, Mombaecher, T, Monroy, IA, Monteil, S, Morandin, M, Morello, G, Morello, MJ, Morgunova, O, Moron, J, Morris, AB, Mountain, R, Muheim, F, Mukherjee, M, Mulder, M, Murphy, CH, Murray, D, Moedden, A, Mueller, D, Mueller, J, Mueller, K, Mueller, V, Naik, P, Nakada, T, Nandakumar, R, Nandi, A, Nanut, T, Nasteva, I, Needham, M, Neri, N, Neubert, S, Neufeld, N, Newcombe, R, Nguyen, TD, Nguyen-Mau, C, Nieswand, S, Niet, R, Nikitin, N, Nogay, A, Nolte, NS, O'Hanlon, DP, Oblakowska-Mucha, A, Obraztsov, V, Oldeman, R, Onderwater, CJG, Ossowska, A, Otalora Goicochea, JM, Ovsiannikova, T, Owen, P, Oyanguren, A, Pais, PR, Pajero, T, Palano, A, Palutan, M, Panshin, G, Papanestis, A, Pappagallo, M, Pappalardo, LL, Parker, W, Parkes, C, Passaleva, G, Pastore, A, Patel, M, Patrignani, C, Pearce, A, Pellegrino, A, Penso, G, Altarelli, M Pepe, Perazzini, S, Pereima, D, Perret, P, Pescatore, L, Petridis, K, Petrolini, A, Petrov, A, Petrucci, S, Petruzzo, M, Pietrzyk, B, Pietrzyk, G, Pikies, M, Pili, M, Pinci, D, Pinzino, J, Pisani, F, Piucci, A, Placinta, V, Playfer, S, Plews, J, Plo Casasus, M, Polci, F, Lener, M Poli, Poluektov, A, Polukhina, N, Polyakov, I, Polycarpo, E, Pomery, GJ, Ponce, S, Popov, A, Popov, D, Poslavskii, S, Price, E, Prisciandaro, J, Prouve, C, Pugatch, V, Navarro, A Puig, Pullen, H, Punzi, G, Qian, W, Qin, J, Quagliani, R, Quintana, B, Raab, NV, Rachwal, B, Rademacker, JH, Rama, M, Ramos Pernas, M, Rangel, MS, Ratnikov, F, Raven, G, Salzgeber, M Ravonel, Reboud, M, Redi, F, Reichert, S, dos Reis, AC, Reiss, F, Remon Alepuz, C, Ren, Z, Renaudin, V, Ricciardi, S, Richards, S, Rinnert, K, Robbe, P, Robert, A, Rodrigues, AB, Rodrigues, E, Rodriguez Lopez, JA, Roehrken, M, Roiser, S, Rollings, A, Romanovskiy, V, Romero Vidal, A, Rotondo, M, Rudolph, MS, Ruf, T, Ruiz Vidal, J, Saborido Silva, JJ, Sagidova, N, Saitta, B, Salustino Guimaraes, V, Gras, C Sanchez, Sanchez Mayordomo, C, Sanmartin Sedes, B, Santacesaria, R, Santamarina Rios, C, Santimaria, M, Santovetti, E, Sarpis, G, Sarti, A, Satriano, C, Satta, A, Saur, M, Savrina, D, Schael, S, Schellenberg, M, Schiller, M, Schindler, H, Schmelling, M, Schmelzer, T, Schmidt, B, Schneider, O, Schopper, A, Schreiner, HF, Schubiger, M, Schulte, S, Schune, MH, Schwemmer, R, Sciascia, B, Sciubba, A, Semennikov, A, Sepulveda, ES, Sergi, A, Serra, N, Serrano, J, Sestini, L, Seuthe, A, Seyfert, P, Shapkin, M, Shcheglov, Y, Shears, T ORCID: 0000-0002-2653-1366, Shekhtman, L, Shevchenko, V, Shmanin, E, Siddi, BG, Coutinho, R Silva, Silva de Oliveira, L, Simi, G, Simone, S, Skiba, I, Skidmore, N, Skwarnicki, T, Slater, MW, Smeaton, JG, Smith, E, Smith, IT, Smith, M, Soares, M, Soares Lavra, L, Sokoloff, MD, Soler, FJP, Souza De Paula, B, Spaan, B, Norella, E Spadaro, Spradlin, P, Stagni, F, Stahl, M, Stahl, S, Stefko, P, Stefkova, S, Steinkamp, O, Stemmle, S, Stenyakin, O, Stepanova, M, Stevens, H, Stocchi, A, Stone, S, Storaci, B, Stracka, S, Stramaglia, ME, Straticiuc, M, Straumann, U, Strokov, S, Sun, J, Sun, L, Sun, Y, Swientek, K, Szabelski, A, 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, Tou, DY, Tourinho Jadallah Aoude, R, Tournefier, E, Traill, M, Tran, MT, Trisovic, A, Tsaregorodtsev, A, Tuci, G, Tully, A, Tuning, N, Ukleja, A, Usachov, A, Ustyuzhanin, A, Uwer, U, Vagner, A, Vagnoni, V, Valassi, A, Valat, S, Valenti, G, Gomez, R Vazquez, Vazquez Regueiro, P, Vecchi, S, van Veghel, M, Velthuis, JJ, Veltri, M, Veneziano, G, Venkateswaran, A, Vernet, M, Veronesi, M, Vesterinen, M, Barbosa, JV Viana, Vieira, D, Vieites Diaz, M, Viemann, H, Vilasis-Cardona, X, Vitkovskiy, A, Vitti, M, Volkov, V, Vollhardt, A, Bruch, D Vom, Voneki, B, Vorobyev, A, Vorobyev, V, Voropaev, N, de Vries, JA, Sierra, C Vazquez, 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, Wilkinson, G, Wilkinson, M, Williams, I, Williams, MRJ, Williams, M, Williams, T, Wilson, FF, Winn, M, 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, Yeomans, LE, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zarebski, KA, Zavertyaev, M, Zhang, D, Zhang, L, Zhang, WC, Zhang, Y, Zhelezov, A, Zheng, Y, Zhu, X, Zhukov, V, Zonneveld, JB and Zucchelli, S
(2021)
Observation of the decay Λb0<i>→</i> χ<sub>c1</sub>pπ<SUP><i>-</i></SUP>.
JOURNAL OF HIGH ENERGY PHYSICS, 2021 (5).
95-.
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Abstract
<jats:title>A<jats:sc>bstract</jats:sc>
</jats:title><jats:p>The Cabibbo-suppressed decay <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Lambda}_{\mathrm{b}}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula><jats:italic>→</jats:italic> χ<jats:sub>c1</jats:sub>pπ<jats:sup><jats:italic>−</jats:italic></jats:sup> is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Lambda}_{\mathrm{b}}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula><jats:italic>→</jats:italic> χ<jats:sub>c2</jats:sub>pπ<jats:sup><jats:italic>−</jats:italic></jats:sup> decay is also found. Using the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Lambda}_{\mathrm{b}}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula><jats:italic>→</jats:italic> χ<jats:sub>c1</jats:sub>pK<jats:sup><jats:italic>−</jats:italic></jats:sup> decay as normalisation channel, the ratios of branching fractions are measured to be<jats:disp-formula><jats:alternatives><jats:tex-math>$$ {\displaystyle \begin{array}{c}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=\left(6.59\pm 1.01\pm 0.22\right)\times {10}^{-2},\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}=0.95\pm 0.30\pm 0.04\pm 0.04,\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\mathrm{K}}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=1.06\pm 0.05\pm 0.04\pm 0.04,\end{array}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mtable>
<mml:mtr>
<mml:mtd>
<mml:mfrac>
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mfenced>
<mml:mrow>
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
<mml:mo>→</mml:mo>
<mml:msub>
<mml:mi>χ</mml:mi>
<mml:mrow>
<mml:mi>c</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msup>
<mml:mi>pπ</mml:mi>
<mml:mo>−</mml:mo>
</mml:msup>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mfenced>
<mml:mrow>
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
<mml:mo>→</mml:mo>
<mml:msub>
<mml:mi>χ</mml:mi>
<mml:mrow>
<mml:mi>c</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msup>
<mml:mi>pK</mml:mi>
<mml:mo>−</mml:mo>
</mml:msup>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mfrac>
<mml:mo>=</mml:mo>
<mml:mfenced>
<mml:mrow>
<mml:mn>6.59</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>1.01</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.22</mml:mn>
</mml:mrow>
</mml:mfenced>
<mml:mo>×</mml:mo>
<mml:msup>
<mml:mn>10</mml:mn>
<mml:mrow>
<mml:mo>−</mml:mo>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msup>
<mml:mo>,</mml:mo>
</mml:mtd>
</mml:mtr>
<mml:mtr>
<mml:mtd>
<mml:mfrac>
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mfenced>
<mml:mrow>
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
<mml:mo>→</mml:mo>
<mml:msub>
<mml:mi>χ</mml:mi>
<mml:mrow>
<mml:mi>c</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msup>
<mml:mi>pπ</mml:mi>
<mml:mo>−</mml:mo>
</mml:msup>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mfenced>
<mml:mrow>
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
<mml:mo>→</mml:mo>
<mml:msub>
<mml:mi>χ</mml:mi>
<mml:mrow>
<mml:mi>c</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msup>
<mml:mi>pπ</mml:mi>
<mml:mo>−</mml:mo>
</mml:msup>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mfrac>
<mml:mo>=</mml:mo>
<mml:mn>0.95</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.30</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.04</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.04</mml:mn>
<mml:mo>,</mml:mo>
</mml:mtd>
</mml:mtr>
<mml:mtr>
<mml:mtd>
<mml:mfrac>
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mfenced>
<mml:mrow>
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
<mml:mo>→</mml:mo>
<mml:msub>
<mml:mi>χ</mml:mi>
<mml:mrow>
<mml:mi>c</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msup>
<mml:mi>pK</mml:mi>
<mml:mo>−</mml:mo>
</mml:msup>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
<mml:mrow>
<mml:mi>B</mml:mi>
<mml:mfenced>
<mml:mrow>
<mml:msubsup>
<mml:mi>Λ</mml:mi>
<mml:mi>b</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
<mml:mo>→</mml:mo>
<mml:msub>
<mml:mi>χ</mml:mi>
<mml:mrow>
<mml:mi>c</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msup>
<mml:mi>pK</mml:mi>
<mml:mo>−</mml:mo>
</mml:msup>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mfrac>
<mml:mo>=</mml:mo>
<mml:mn>1.06</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.05</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.04</mml:mn>
<mml:mo>±</mml:mo>
<mml:mn>0.04</mml:mn>
<mml:mo>,</mml:mo>
</mml:mtd>
</mml:mtr>
</mml:mtable>
</mml:math></jats:alternatives></jats:disp-formula></jats:p><jats:p>where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χ<jats:sub>c1<jats:italic>,</jats:italic>2</jats:sub><jats:italic>→</jats:italic> J<jats:italic>/</jats:italic>ψγ decays.</jats:p>
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