Observation of muonic Dalitz decays of $\chi_{b}$ mesons and precise spectroscopy of hidden-beauty states

• Published in: The journal of high energy physics 2024-08, Vol.10
• Main Authors: Aaij, Roel, Abdelmotteleb, Ahmed Sameh Wagih, Abellan Beteta, Carlos, Abudinén, Fernando Jesus, Ackernley, Thomas, Adefisoye, Ayomide Matthew, Adeva, Bernardo, Adinolfi, Marco, Adlarson, Patrik Harri, Agapopoulou, Christina, Aidala, Christine Angela, Ajaltouni, Ziad, Akar, Simon, Akiba, Kazuyoshi, Albicocco, Pietro, Albrecht, Johannes, Alessio, Federico, Alexander, Michael, Aliouche, Zakariya, Alvarez Cartelle, Paula, Amalric, Renaud, Amato, Sandra, Amey, Jake Lewis, Amhis, Yasmine, An, Liupan, Anderlini, Lucio, Andersson, Martin, Andreianov, Aleksei, Andreola, Pasquale, Andreotti, Mirco, Andreou, Dimitra, Anelli, Alessia, Ao, Dong, Archilli, Flavio, Argenton, Matteo, Arguedas Cuendis, Sergio, Artamonov, Alexander, Artuso, Marina, Aslanides, Elie, Ataíde da Silva, Rita, Atzeni, Michele, Audurier, Benjamin, Bacher, David, Bachiller Perea, Irene, Bachmann, Sebastian, Bachmayer, Marie, Back, John, Baladron Rodriguez, Pablo, Balagura, Vladislav, Baldini, Wander, Balzani, Luca, Bao, Haoran, Baptista de Souza Leite, Juan, Barbero Pretel, Carlos Javier, Barbetti, Matteo, Barbosa, Ivanildo Rui, Barlow, Roger, Barnyakov, Mikhail, Barsuk, Sergey, Barter, William, Bartolini, Matteo, Bartz, Justin, Basels, Jan-Marc, Bashir, Saliha, Bassi, Giovanni, Batsukh, Baasansuren, Battista, Piera, Bay, Aurelio, Beck, Anja, Becker, Maik, Bedeschi, Franco, Bediaga, Ignacio, Behling, Noah Albin, Belin, Samuel, Bellee, Violaine, Belous, Konstantin, Belov, Ilia, Belyaev, Ivan, Benane, Gaya, Bencivenni, Giovanni, Ben-Haim, Eli, Berezhnoy, Alexander, Bernet, Roland, Bernet Andres, Sergi, Bertolin, Alessandro, Betancourt, Christopher, Betti, Federico, Bex, Josh, Bezshyiko, Iaroslava, Bhom, Jihyun, Bieker, Martin Stefan, Biesuz, Nicolo Vladi, Billoir, Pierre, Biolchini, Alice, Birch, Matthew, Bishop, Fionn Caitlin Ros, Bitadze, Alexander, Bizzeti, Andrea, Blake, Thomas, Blanc, Frederic
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 1126-6708; 1029-8479
• DOI: 10.1007/JHEP10(2024)122

The decays of the $\chi_{b1}(1P)$, $\chi_{b2}(1P)$, $\chi_{b1}(2P)$ and $\chi_{b2}(2P)$~mesons into the~$\Upsilon(1S)\mu^+\mu^-$ final state are observed with a high significance using proton-proton collision data collected with the LHCb detector and corresponding to an integrated luminosity of 9fb$^{-1}$. The newly observed decays together with the $\Upsilon(2S)\rightarrow \Upsilon(1S)\pi^+\pi^-$ and $\Upsilon(3S)\rightarrow \Upsilon(2S)\pi^+\pi^-$ decay modes are used for precision measurements of the mass and mass splittings for the hidden-beauty states.