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Observation of overlapping spin-1 and spin-3 $\overline{D}^0 K^-$ resonances at mass $2.86 {\rm GeV}/c^2$

The resonant substructure of $B_s^0 \rightarrow \overline{D}^0 K^- \pi^+$ decays is studied using a data sample corresponding to an integrated luminosity of $3.0\,{\rm fb}^{-1}$ of $pp$ collision data recorded by the LHCb detector. An excess at $m(\overline{D}^0 K^-) \approx 2.86 {\rm GeV}/c^2$ is f...

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Vollhardt, Achim, Volyanskyy, Dmytro, Voong, David, Vorobyev, Alexey, Vorobyev, Vitaly, Voß, Christian, Voss, Helge, de Vries, Jacco, Waldi, Roland, Wallace, Charlotte, Wallace, Ronan, Walsh, John, Wandernoth, Sebastian, Wang, Jianchun, Ward, David, Watson, Nigel, Websdale, David, Whitehead, Mark, Wicht, Jean, Wiedner, Dirk, Wilkinson, Guy, Williams, Matthew, Williams, Mike, Wilson, Fergus, Wimberley, Jack, Wishahi, Julian, Wislicki, Wojciech, Witek, Mariusz, Wormser, Guy, Wotton, Stephen, Wright, Simon, Wu, Suzhi, Wyllie, Kenneth, Xie, Yuehong, Xing, Zhou, Xu, Zhirui, Yang, Zhenwei, Yuan, Xuhao, Yushchenko, Oleg, Zangoli, Maria, Zavertyaev, Mikhail, Zhang, Liming, Zhang, Wen Chao, Zhang, Yanxi, Zhelezov, Alexey, Zhokhov, Anatoly, Zhong, Liang, Zvyagin, Alexander
Lenguaje:eng
Publicado: 28 0
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.113.162001
http://cds.cern.ch/record/1746548
Descripción
Sumario:The resonant substructure of $B_s^0 \rightarrow \overline{D}^0 K^- \pi^+$ decays is studied using a data sample corresponding to an integrated luminosity of $3.0\,{\rm fb}^{-1}$ of $pp$ collision data recorded by the LHCb detector. An excess at $m(\overline{D}^0 K^-) \approx 2.86 {\rm GeV}/c^2$ is found to be an admixture of spin-1 and spin-3 resonances. Therefore the $D^*_{sJ}(2860)^-$ state previously observed in inclusive $e^+e^- \rightarrow \overline{D}^0 K^- X$ and $pp \rightarrow \overline{D}^0 K^- X$ processes consists of at least two particles. This is the first observation of a heavy flavoured spin-3 resonance, and the first time that any spin-3 particle has been seen to be produced in $B$ decays. The masses and widths of the new states and of the $D^*_{s2}(2573)^-$ meson are measured, giving the most precise determinations to date.