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Quantum numbers of the $X(3872)$ state and orbital angular momentum in its $\rho^0 J/\psi$ decays

Angular correlations in $B^+\to X(3872) K^+$ decays, with $X(3872)\to \rho^0 J/\psi$, $\rho^0\to\pi^+\pi^-$ and $J/\psi \to\mu^+\mu^-$, are used to measure orbital angular momentum contributions and to determine the $J^{PC}$ value of the $X(3872)$ meson. The data correspond to an integrated luminosi...

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Velthuis, Jaap, Veltri, Michele, Veneziano, Giovanni, Vesterinen, Mika, Viaud, Benoit, Vieira, Daniel, Vieites Diaz, Maria, Vilasis-Cardona, Xavier, Vollhardt, Achim, Volyanskyy, Dmytro, Voong, David, Vorobyev, Alexey, Vorobyev, Vitaly, Voß, Christian, de Vries, Jacco, Waldi, Roland, Wallace, Charlotte, Wallace, Ronan, Walsh, John, Wandernoth, Sebastian, Wang, Jianchun, Ward, David, Watson, Nigel, Websdale, David, Weiden, Andreas, Whitehead, Mark, Wiedner, Dirk, Wilkinson, Guy, Wilkinson, Michael, Williams, Mark Richard James, Williams, Matthew, Williams, Mike, Wilson, Fergus, Wimberley, Jack, Wishahi, Julian, Wislicki, Wojciech, Witek, Mariusz, Wormser, Guy, Wotton, Stephen, Wright, Simon, Wyllie, Kenneth, Xie, Yuehong, Xu, Zhirui, Yang, Zhenwei, Yuan, Xuhao, Yushchenko, Oleg, Zangoli, Maria, Zavertyaev, Mikhail, Zhang, Liming, Zhang, Yanxi, Zhelezov, Alexey, Zhokhov, Anatoly, Zhong, Liang
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.92.011102
http://cds.cern.ch/record/2012165
Descripción
Sumario:Angular correlations in $B^+\to X(3872) K^+$ decays, with $X(3872)\to \rho^0 J/\psi$, $\rho^0\to\pi^+\pi^-$ and $J/\psi \to\mu^+\mu^-$, are used to measure orbital angular momentum contributions and to determine the $J^{PC}$ value of the $X(3872)$ meson. The data correspond to an integrated luminosity of 3.0 fb$^{-1}$ of proton-proton collisions collected with the LHCb detector. This determination, for the first time performed without assuming a value for the orbital angular momentum, confirms the quantum numbers to be $J^{PC}=1^{++}$. The $X(3872)$ is found to decay predominantly through S wave and an upper limit of $4\%$ at $95\%$ C.L. is set on the fraction of D wave.