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Register a new userStudy of Three-Body Y(10860) Decays
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We report preliminary results on the analysis of the three-body Y(10860)=> B barB pi, Y(10860) => (B barB* + c.c.) pi and Y(10860)=> B* barB* pi decays including an observation of the Y(10860)=> Zb(10610)+- pi-+ => [B barB*+c.c]+- pi-+ and Y(10860)=> Zb(10650)+- pi-+ => [B* barB*]+- pi-+ decays as intermediate channels. We measure branching fractions of the three-body decays to be Br(Y(10860)=> [B barB*+c.c.]+- pi-+)=(28.3+-2.9+-4.6)x10^{-3} and Br(Y(10860)=> [B* barB*]+- pi-+)=(14.1+-1.9+-2.4)x10^{-3} and set 90% C.L. upper limit Br(Y(10860)=> [B barB]+- pi-+)<4.0x10^{-3}. We also report results on the amplitude analysis of the three-body Y(10860)=>Y(nS)pi+pi-, n=1,2,3 decays and the analysis of the internal structure of the three-body Y(10860)=>hb(mP)pi+pi-, m=1,2 decays. The results are based on a 121.4 1/fb data sample collected with the Belle detector at a center-of-mass energy near the Y(10860).
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Results are presented on the study of three body decays of D0 -> K0s h+ h-, where h=pi/K and DS+ -> K0S K0S pi+. The data have been collected by the BaBar experiment at SLAC and are extracted from continuum e+ e- annihilations at the Upsilon(4S) energy.
Decays of the Y(5S) resonance to channels with B^+ and B^0 mesons are studied using a 23.6 fb^-1 data sample collected on the Y(5S) resonance with the Belle detector at the KEKB asymmetric energy e^+ e^- collider. The fully reconstructed B^+ -> J/psi K^+, B^0 -> J/psi K^{*0}, B^+ -> bar_D^0 pi^+ and B^0 -> D^- pi^+ decays are used to obtain the B^+ and B^0 production rates per bb_bar event, f(B^+) = (67.5 pm 3.6 pm 4.8)% and f(B^0)=(70.4^{+5.2}_{-5.1} pm 6.2)%$. Assuming equal rates to B^+ and B^0 mesons in all channels produced at the Y(5S) energy, we measure the fractions for bb_bar event transitions to the two-body and multi-body channels with B^{+/0} meson pairs, f(Bbar{B}) = (5.1 pm 0.9 pm 0.4)%, f(Bbar{B}^*+B^*bar{B}) = (12.6^{+1.2}_{-1.1} pm 1.0)%, f(B^*bar{B}^*) = (34.5^{+1.9}_{-1.8} pm 2.7)%, f(B^{(*)}bar{B}^{(*)}pi(pi)) = (16.4^{+1.6}_{-1.5} pm 1.2)%, f(Bbar{B} pi) = (0.0 pm 1.1 pm 0.2)%, f(Bbar{B}^*pi+B^*bar{B}pi) = (6.8^{+2.1}_{-2.0} pm 0.7)%, and f(B^*bar{B}^*pi) = (1.0^{+1.3}_{-1.2} pm 0.3)%.
The three body pion decays ${pi}^+{rightarrow}l^+{ u}X~(l=e,{mu})$, where $X$ is a weakly interacting neutral boson, were searched for using the full data set from the PIENU experiment. An improved limit on ${Gamma}({pi}^+{to}e^+{ u}X)/{Gamma}({pi}^+{to}{mu}^+{ u}_{mu})$ in the mass range $0<m_X<120$ MeV/$c^2$ and a first result for ${Gamma}({pi}^+{to}{mu}^+{ u}X)/{Gamma}({pi}^+{to}{mu}^+{ u}_{mu})$ in the region $0<m_X<33.9$ MeV/$c^2$ were obtained. The Majoron-neutrino coupling model was also constrained using the current experimental result of the ${pi}^+{to}e^+{ u}_e({gamma})$ branching ratio.
The decays of light vector mesons into three pseudoscalar mesons are calculated to leading order in the recently proposed counting scheme that is based on the hadrogenesis conjecture. Fully differential as well as integrated decay widths are presented. Since the required parameters have been fixed by other processes, the considered three-body decays are predictions of the presented approach. The decay width of the omega meson into three pions agrees very well with experiment. The partial decay widths of the K^* into its three K-pi-pi channels are predicted.
We present a general formalism to write the decay amplitude for multibody reactions with explicit separation of the rotational degrees of freedom, which are well controlled by the spin of the decay particle, and dynamic functions on the subchannel invariant masses, which require modeling. Using the three-particle kinematics we demonstrate the proposed factorization, named the Dalitz-plot decomposition. The Wigner rotations, that are subtle factors needed by the isobar modeling in the helicity framework, are simplified with the proposed decomposition. Consequently, we are able to provide them in an explicit form suitable for the general case of arbitrary spins. The only unknown model-dependent factors are the isobar lineshapes that describe the subchannel dynamics. The advantages of the new decomposition are shown through three examples relevant for the recent discovery of the exotic charmonium candidate $Z_c(4430)$, the pentaquarks $P_c$, and the intriguing $Lambda_c^+to pK^-pi^+$ decay.
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