First determination of the spin-parity of ${\Xi}_{c}(3055)^{+,0}$ baryons

The ${{\Xi}_{b}^{0(-)}\to{\Xi}_{c}(3055)^{+(0)}(\to D^{+(0)}{\Lambda}){\pi}^{-}}$ decay chains are observed, and the spin-parity of ${\Xi}_{c}(3055)^{+(0)}$ baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of $\sqrt{...

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Published in:Physical review letters Vol. 134; no. 8
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: Journal Article
Language:English
Published: American Physical Society 28.02.2025
Subjects:
High Energy Physics - Experiment
Physics
ISSN:0031-9007, 1079-7114
Online Access:Get full text
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Summary:The ${{\Xi}_{b}^{0(-)}\to{\Xi}_{c}(3055)^{+(0)}(\to D^{+(0)}{\Lambda}){\pi}^{-}}$ decay chains are observed, and the spin-parity of ${\Xi}_{c}(3055)^{+(0)}$ baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of $\sqrt{s}=13\,\text{TeV}$, corresponding to an integrated luminosity of $5.4\,\text{fb}^{-1}$, recorded by the~$\text{LHCb}$ experiment between 2016 and 2018. The spin-parity of the ${\Xi}_{c}(3055)^{+(0)}$ baryons is determined to be $3/2^{+}$ with a significance of more than $6.5\sigma$ ($3.5\sigma$) compared to all other tested hypotheses. The up-down asymmetries of the ${{\Xi}_{b}^{0(-)}\to{\Xi}_{c}(3055)^{+(0)}{\pi}^{-}}$ transitions are measured to be $-0.92\pm0.10\pm0.05$ ($-0.92\pm0.16\pm0.22$), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the ${\Xi}_{c}(3055)^{+(0)}$ baryons correspond to the first $D$-wave $\lambda$-mode excitation of the ${\Xi}_{c}$ flavor triplet.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.134.081901