TY - JOUR
T1 - Observation of Orbitally Excited (Formula presented) States
AU - Aaij, R.
AU - Abdelmotteleb, A. S.W.
AU - Abellan Beteta, C.
AU - Abudinén, F.
AU - Ackernley, T.
AU - Adefisoye, A. A.
AU - Adeva, B.
AU - Adinolfi, M.
AU - Adlarson, P.
AU - Agapopoulou, C.
AU - Aidala, C. A.
AU - Ajaltouni, Z.
AU - Akar, S.
AU - Akiba, K.
AU - Albicocco, P.
AU - Albrecht, J.
AU - Alessio, F.
AU - Aliouche, Z.
AU - Alvarez Cartelle, P.
AU - Amalric, R.
AU - Amato, S.
AU - Amey, J. L.
AU - Amhis, Y.
AU - An, L.
AU - Anderlini, L.
AU - Andersson, M.
AU - Andreola, P.
AU - Andreotti, M.
AU - Andres Estrada, S.
AU - Anelli, A.
AU - Ao, D.
AU - Archilli, F.
AU - Areg, Z.
AU - Argenton, M.
AU - Arguedas Cuendis, S.
AU - Artamonov, A.
AU - Artuso, M.
AU - Aslanides, E.
AU - Ataíde Da Silva, R.
AU - Atzeni, M.
AU - Audurier, B.
AU - Authier, J. A.
AU - Bacher, D.
AU - Bachiller Perea, I.
AU - Bachmann, S.
AU - Bachmayer, M.
AU - Back, J. J.
AU - Baladron Rodriguez, P.
AU - Balagura, V.
AU - Balboni, A.
AU - LHCb collaboration
AU - da silva Bolognani, Carolina
AU - Burgos Marcos, Marta
AU - Cámpora Pérez, Daniel Hugo
AU - Chiotopoulos, Xenofon
AU - de Vries, Jacco
AU - Nicotra, Davide
AU - Onderwater, Gerco
AU - Pawley, Chris
AU - Ruiz Vidal, Joan
AU - Vos, Keri
AU - Merk, Marcel
N1 - Publisher Copyright:
© 2025 CERN, for the LHCb Collaboration.
PY - 2025/12/5
Y1 - 2025/12/5
N2 - The observation of a wide peaking structure in the (Formula presented) mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of (Formula presented). The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at (Formula presented) and (Formula presented). The uncertainty terms are statistical, systematic, and associated to the knowledge of the (Formula presented) mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited (Formula presented)-wave (Formula presented) states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.
AB - The observation of a wide peaking structure in the (Formula presented) mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of (Formula presented). The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at (Formula presented) and (Formula presented). The uncertainty terms are statistical, systematic, and associated to the knowledge of the (Formula presented) mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited (Formula presented)-wave (Formula presented) states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.
U2 - 10.1103/fc8j-tb8k
DO - 10.1103/fc8j-tb8k
M3 - Article
SN - 0031-9007
VL - 135
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 231902
ER -