First Measurement of Γ(D*+)

Abstract

We present the first measurement of the D*(+) width using 9/fb of e(+)e(-) data collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical size of the Cornell Electron-positron Storage Ring beam spot to measure the energy release distribution from the D*(+)-->D(0)pi(+) decay. We find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. We also measure the energy release in the decay and compute Delta m identical with m(D*(+))-m(D(0)) = 145.412+/-0.002 (stat)+/-0.012 (syst) MeV/c(2).

DΞ and D*Ξ molecular states from one boson exchange

“…which is compatible with g 1 ¼ 0.59 AE 0.01 AE 0.07 as extracted from the D Ã → Dπ decay [50,51]. The coupling to the σ meson, in the case of the nucleonnucleon interaction, can be determined from the nonlinear sigma model [52], yielding…”

Heavy quark spin symmetry partners of theX(3872)

“…In the charm sector, g has been determined from the D * meson decays in Refs. [40,41] yielding g = 0.59 ± 0.01 ± 0.07, which we approximate by g ≃ 0.6. In the strict heavy quark limit, the latest lattice QCD results suggest the value g = 0.449 ± 0.047 ± 0.019, see Refs.…”

“…The finite range contribution is the well-known one pion exchange (OPE) potential, where g ≃ 0.6 is the axial coupling between the heavy meson and the pion (we have particularized its value for the charmed meson case, see Refs. [40,41] for a determination), f π ≃ 132 MeV the pion decay constant, and q the momentum exchanged by the heavy meson and antimeson. The sign η and the polarization operators a and b depend on whether the initial/final states is PP, PP * , P * P or P * P * .…”

“…However, had we re-expanded the propagator 1/(k 2 β − q 2 ) in inverse powers of k β (as mandated by power counting), the power-law divergence would have worsened to Λ 3 , see Eq. (40). Putting all the pieces together (and ignoring the propagator re-expansion), the total divergence in the energy shift is given by C 2 αβ Λ 3 .…”

Analysis of the nonleptonic charmonium modes Bs0→J/ψf2′(1525) and Morales1, Quintero2, Vera3 et al. 2017Phys. Rev. D8050View full textAdd to dashboardCite

“…The heavyflavor independent strong coupling g can be extracted from the CLEO measurement of the D * + decay width, |g| = 0.59 ± 0.07 [28]. For the pole mass and decay constants we will take the following numerical inputs: m B * = 5324.83 MeV [2] and f K = (155.6 ± 0.4) MeV [29], f Bs = (226.0 ± 2.2) MeV [29], f B * = (175 ± 6) MeV [30].…”