calculated width for the two pion decay of the L= 1 Dmesons by about 25%. The amplitude for two-pion decay is found to be mainly spin-independent, which is in accordancewith the current empirical information on the ππdecays of the analogous strange Kmesons. The ππdecay width of the D∗ 2 meson is predicted to be about 3 MeV. For the D
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The hadronic matrix element can only be a vector as explained in chapter one. With the NUCLEAR PHYSICS A ELSEVIER Nuclear Physics A 605 (1996) 475-495 Electromagnetic pion form factor and neutral pion decay width Craig D. Roberts1 Physics Division, Bldg. 203, Argonne National Laboratory, Argonne, IL 60439-4843, USA Received 12 October 1995; revised 1 April 1996 Abstract The electromagnetic pion form factor, F~(q2), is calculated for spacelike q2 in impulse approx- imation using There is a set of models based on the SU(2) Nambu-Jona-Lasinio (NJL) model [4,5] predicting an enhancement of the neutral pion decay width at the so-called Mott temperature at which the pion calculated pion decay width of the D1 meson is suppressed by taking into account the exchange charge e ects that are associated with the scalar linear con ning and vector one-gluon exchange interactions. The predicted values for the pionic widths of the hitherto undiscoveredL =1D1 and D0 mesons are found to be smaller than previous estimates. Hence, the decay width is simply the decay rate per particle. The branching ratio, Bi, for a particular decay mode, i, is defined as the percentage of the particles decaying in this mode.
Pion Beta Decay Rate. The differential decay width is: where the matrix element is Figure: The opening angle between the two gamma rays from the decays.
The pion has J=0, so the µ+ and νhave the same helicities: The decay to an electron and a neutrino is helicity suppressed R= Γ(π→ eν) Γ(π→ µν) = m2 e m2 µ 1 (1−m2 µ/m2π)2 = 1.275× 10−4 Experimental result proves V−Atheory of weak interactions: R= (1.267±0.023) ×10−4 4
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Finite pion width effects on the $\rho$-mesonWe study the influence of the finite damping width of pions on the in-medium properties of the rho-meson in an
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The pion decay constant can be measured in the leptonic decay of charged pions The decay rate (width) reads The experimental value clearly supports N c =3. decay of both the muon and the tau, a virtual charged intermediate vector boson (W*) materializes into fermion-antifermion pairs.
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Extend method to complex momenta. W. A. Mian. EW pion decay in FM.
We have measured both the mesonic and nonmesonic weak decay widths of 12. Λ C. For the mesonic duced via the (π+, K+) reaction at the pion momentum.
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Neutral Pion decay width in a hot and dense medium. Full Record; Other Related Research; Authors: Caldas, Heron Publication Date: Wed Jan 01 00:00:00 EST 2003
Pion weak decay By substituting (50) and (51) into (45), we find (52) where p is the momentum of the electron in the rest frame of the pion: (53) (54) In a similar way (by replacing m e by mμ ), one can calculate the decay width for Îthe ratio decay width for π →e +ν e − − π →μ+νμ − − (55) π →e +ν e The pionic decay rates of the excited L=0,1 D mesons are calculated with a Hamiltonian model within the framework of the covariant Blankenbecler-Sugar equation. The interaction between the light quark and charm antiquark is described by a linear scalar confining and a screened one-gluon exchange interaction.
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Pion weak decay By substituting (50) and (51) into (45), we find (52) where p is the momentum of the electron in the rest frame of the pion: (53) (54) In a similar way (by replacing m e by mμ ), one can calculate the decay width for Îthe ratio decay width for π →e +ν e − − π →μ+νμ − − (55) π →e +ν e
In all that follows, the charged conjugate decays, i.e. here ˇ+! e+ e, etc, are also implied.