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Observation of an excited $B_c^+$ state

Using pp collision data corresponding to an integrated luminosity of 8.5  fb-1 recorded by the LHCb experiment at center-of-mass energies of s=7, 8, and 13 TeV, the observation of an excited Bc+ state in the Bc+π+π- invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat...

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Autores principales: Aaij, Roel, Abellán Beteta, Carlos, Adeva, Bernardo, Adinolfi, Marco, Aidala, Christine Angela, Ajaltouni, Ziad, Akar, Simon, Albicocco, Pietro, Albrecht, Johannes, Alessio, Federico, Alexander, Michael, Alfonso Albero, Alejandro, Alkhazov, Georgy, Alvarez Cartelle, Paula, Alves Jr, Antonio Augusto, Amato, Sandra, Amhis, Yasmine, An, Liupan, Anderlini, Lucio, Andreassi, Guido, Andreotti, Mirco, Andrews, Jason, Archilli, Flavio, d'Argent, Philippe, Arnau Romeu, Joan, Artamonov, Alexander, Artuso, Marina, Arzymatov, Kenenbek, Aslanides, Elie, Atzeni, Michele, Audurier, Benjamin, Bachmann, Sebastian, Back, John, Baker, Sophie, Balagura, Vladislav, Baldini, Wander, Baranov, Alexander, Barlow, Roger, Barsuk, Sergey, Barter, William, Bartolini, Matteo, Baryshnikov, Fedor, Batozskaya, Varvara, Batsukh, Baasansuren, Battig, Alexander, Battista, Vincenzo, Bay, Aurelio, Bedeschi, Franco, Bediaga, Ignacio, Beiter, Andrew, Bel, Lennaert, Belin, Samuel, Beliy, Nikita, Bellee, 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Kevin, Heister, Arno, Hennessy, Karol, Henry, Louis, van Herwijnen, Eric, Heuel, Johannes, Heß, Miriam, Hicheur, Adlène, Hidalgo Charman, Raoul, Hill, Donal, Hilton, Martha, Hopchev, Plamen Hristov, Hu, Jiangqiao, Hu, Wenhua, Huang, Wenqian, Huard, Zachary, Hulsbergen, Wouter, Humair, Thibaud, Hushchyn, Mikhail, Hutchcroft, David, Hynds, Daniel, Ibis, Philipp, Idzik, Marek, Ilten, Philip, Inglessi, Alexander, Inyakin, Alexander, Ivshin, Kuzma, Jacobsson, Richard, Jakobsen, Sune, Jalocha, Pawel, Jans, Eddy, Jashal, Brij Kishor, Jawahery, Abolhassan, Jiang, Feng, John, Malcolm, Johnson, Daniel, Jones, Christopher, Joram, Christian, Jost, Beat, Jurik, Nathan, Kandybei, Sergii, Karacson, Matthias, Kariuki, James Mwangi, Karodia, Sarah, Kazeev, Nikita, Kecke, Matthieu, Keizer, Floris, Kelsey, Matthew, Kenzie, Matthew, Ketel, Tjeerd, Khanji, Basem, Kharisova, Anastasiia, Khurewathanakul, Chitsanu, Kim, Kyung Eun, Kirn, Thomas, Kirsebom, Veronica Soelund, Klaver, Suzanne, Klimaszewski, Konrad, Koliiev, Serhii, Kolpin, Michael, Kopecna, Renata, Koppenburg, Patrick, Kostiuk, Igor, Kotriakhova, Sofia, Kozeiha, Mohamad, Kravchuk, Leonid, Kreps, Michal, Kress, Felix Johannes, Kretzschmar, Sophie Katharina, Krokovny, Pavel, Krupa, Wojciech, Krzemien, Wojciech, Kucewicz, Wojciech, Kucharczyk, Marcin, Kudryavtsev, Vasily, Kunde, Gerd Joachim, Kuonen, Axel Kevin, Kvaratskheliya, Tengiz, Lacarrere, Daniel, Lafferty, George, Lai, Adriano, Lancierini, Davide, Lanfranchi, Gaia, Langenbruch, Christoph, Latham, Thomas, Lazzeroni, Cristina, Le Gac, Renaud, Leflat, Alexander, Lefèvre, Regis, Lemaitre, Florian, Leroy, Olivier, Lesiak, Tadeusz, Leverington, Blake, Li, Hengne, Li, Pei-Rong, Li, Xuan, Li, Yiming, Li, Zhuoming, Liang, Xixin, Likhomanenko, Tatiana, Lindner, Rolf, Ling, Pan, Lionetto, Federica, Lisovskyi, Vitalii, Liu, Guoming, Liu, Xuesong, Loh, David, Loi, Angelo, Longstaff, Iain, Lopes, Jose, Loustau, Guillermo, Lovell, George Holger, Lucchesi, Donatella, Lucio Martinez, Miriam, Luo, Yiheng, Lupato, Anna, Luppi, Eleonora, Lupton, Oliver, Lusiani, Alberto, Lyu, Xiao-Rui, Ma, Rui, Machefert, Frederic, Maciuc, Florin, Macko, Vladimir, Mackowiak, Patrick, Maddrell-Mander, Samuel, Maev, Oleg, Maguire, Kevin, Maisuzenko, Dmitrii, Majewski, Maciej Witold, Malde, Sneha, Malecki, Bartosz, Malinin, Alexander, Maltsev, Timofei, Malygina, Hanna, Manca, Giulia, Mancinelli, Giampiero, Marangotto, Daniele, Maratas, Jan, Marchand, Jean François, Marconi, Umberto, Marin Benito, Carla, Marinangeli, Matthieu, Marino, Pietro, Marks, Jörg, Marshall, Phillip John, Martellotti, Giuseppe, Martinelli, Maurizio, Martinez Santos, Diego, Martinez Vidal, Fernando, Massafferri, André, Materok, Marcel, Matev, Rosen, Mathad, Abhijit, Mathe, Zoltan, Matiunin, Viacheslav, Matteuzzi, Clara, Mattioli, Kara Renee, Mauri, Andrea, Maurice, Emilie, Maurin, Brice, McCann, Michael, McNab, Andrew, McNulty, Ronan, Mead, James Vincent, Meadows, Brian, Meaux, Cedric, Meinert, Nis, Melnychuk, 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Mark, Smeaton, John Gordon, Smith, Eluned, Smith, Iwan Thomas, Smith, Mark, Soares, Marcelo, Soares Lavra, Lais, Sokoloff, Michael, Soler, Paul, Souza De Paula, Bruno, Spaan, Bernhard, Spadaro Norella, Elisabetta, Spradlin, Patrick, Stagni, Federico, Stahl, Marian, Stahl, Sascha, Stefko, Pavol, Stefkova, Slavomira, Steinkamp, Olaf, Stemmle, Simon, Stenyakin, Oleg, Stepanova, Margarita, Stevens, Holger, Stocchi, Achille, Stone, Sheldon, Stracka, Simone, Stramaglia, Maria Elena, Straticiuc, Mihai, Straumann, Ulrich, Strokov, Sergey, Sun, Jiayin, Sun, Liang, Sun, Yipeng, Swientek, Krzysztof, Szabelski, Adam, Szumlak, Tomasz, Szymanski, Maciej Pawel, T'Jampens, Stephane, Tang, Zhipeng, Tekampe, Tobias, Tellarini, Giulia, Teubert, Frederic, Thomas, Eric, van Tilburg, Jeroen, Tilley, Matthew James, Tisserand, Vincent, Tobin, Mark, Tolk, Siim, Tomassetti, Luca, Tonelli, Diego, Tou, Da Yu, Tourinho Jadallah Aoude, Rafael, Tournefier, Edwige, Traill, Murdo, Tran, Minh Tâm, Trisovic, Ana, Tsaregorodtsev, Andrei, Tuci, Giulia, Tully, Alison, Tuning, Niels, Ukleja, Artur, Usachov, Andrii, Ustyuzhanin, Andrey, Uwer, Ulrich, Vagner, Alexander, Vagnoni, Vincenzo, Valassi, Andrea, Valat, Sebastien, Valenti, Giovanni, Van Hecke, Hubert, Van Hulse, Charlotte Barbara, Vasiliev, Alexander, Vazquez Gomez, Ricardo, Vazquez Regueiro, Pablo, Vecchi, Stefania, van Veghel, Maarten, Velthuis, Jaap, Veltri, Michele, Venkateswaran, Aravindhan, Vernet, Maxime, Veronesi, Michele, Vesterinen, Mika, Viana Barbosa, Joao Vitor, Vieira, Daniel, Vieites Diaz, Maria, Viemann, Harald, Vilasis-Cardona, Xavier, Vitkovskiy, Arseniy, Vitti, Marcela, Volkov, Vladimir, Vollhardt, Achim, Vom Bruch, Dorothea, Voneki, Balazs, Vorobyev, Alexey, Vorobyev, Vitaly, Voropaev, Nikolai, de Vries, Jacco, Vázquez Sierra, Carlos, Waldi, Roland, Walsh, John, Wang, Jianchun, Wang, Mengzhen, Wang, Yilong, Wang, Zhenzi, Ward, David, Wark, Heather Mckenzie, Watson, Nigel, Websdale, David, Weiden, Andreas, Weisser, Constantin, Whitehead, Mark, Wilkinson, Guy, Wilkinson, Michael, Williams, Ifan, Williams, Mark Richard James, Williams, Mike, Williams, Timothy, Wilson, Fergus, Winn, Michael Andreas, Wislicki, Wojciech, Witek, Mariusz, Wormser, Guy, Wotton, Stephen, Wyllie, Kenneth, Xiao, Dong, Xie, Yuehong, Xing, Hongxi, Xu, Ao, Xu, Menglin, Xu, Qingnian, Xu, Zehua, Xu, Zhirui, Yang, Zhenwei, Yang, Zishuo, Yao, Yuezhe, Yeomans, Lauren Emma, Yin, Hang, Yu, Jiesheng, Yuan, Xuhao, Yushchenko, Oleg, Zarebski, Kristian Alexander, Zavertyaev, Mikhail, Zeng, Ming, Zhang, Dongliang, Zhang, Liming, Zhang, Wen Chao, Zhang, Yanxi, Zhelezov, Alexey, Zheng, Yangheng, Zhu, Xianglei, Zhukov, Valery, Zonneveld, Jennifer Brigitta, Zucchelli, Stefano
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.122.232001
http://cds.cern.ch/record/2669666
Descripción
Sumario:Using pp collision data corresponding to an integrated luminosity of 8.5  fb-1 recorded by the LHCb experiment at center-of-mass energies of s=7, 8, and 13 TeV, the observation of an excited Bc+ state in the Bc+π+π- invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(Bc+)  MeV/c2, where the last uncertainty is due to the limited knowledge of the Bc+ mass. It is consistent with expectations of the Bc*(2S31)+ state reconstructed without the low-energy photon from the Bc*(1S31)+→Bc+γ decay following Bc*(2S31)+→Bc*(1S31)+π+π-. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(Bc+)  MeV/c2, and is consistent with the Bc(2S10)+ state. These mass measurements are the most precise to date.