arXiv subjects

Ignacio Bediaga

Publications and source records attributed to Ignacio Bediaga.

22 records · Page 2Linked to original sources

arXiv2002

Light Scalar Mesons $σ(500)$, $f_0(980)$ and $κ$ in Charm Meson Decays

We present recent results on scalar light mesons based on Dalitz plot analyses of charm decays from Fermilab experiment E791. Scalar mesons are found to have large contributions to the decays studied, $D^+\to K^-π^+π^+$ and $D^+, D_s^+\toπ^-π^+π^+$. From the first decay, we find good evidence for the existence of the light and broad $κ$ meson and we measure its mass and width. We find strong evidence for the $σ(500)$ meson from $D^+\toπ^-π^+π^+$ decay and measure its mass and width. We also present the results obtained for the $f_0(980)$ parameters through the $D^+_s \toπ^-π^+π^+$ decay. These results demonstrate the importance of charm decays as a new environment for the study of light meson physics.

hep-ex↗

arXiv2002

Light Scalar Mesons in Charm Decays

We present recent results on scalar light mesons based on Dalitz plot analyses of charm decays from Fermilab experiment E791. Low mass scalar mesons are found to have large contributions to the decays studied, D^+\to K^-π^+π^+ and D^+, D_s^+\toπ^-π^+π^+. These results demonstrate the importance of charm decays as a new environment for the study of light meson physics.

hep-ex↗

arXiv2000

Dalitz plot analysis and branching fraction measurement of D+ and Ds+ -> pi+pi-pi+

Fermilab fixed target experiment E791 obtained a sample of $1172 \pm 61$ events of $D^+ \to π^- π^+ π^+$ and 848 $\pm 44$ events of $D_s^+ \to π^- π^+ π^+$ decays. We find respectively $B (D^+ \to π^- π^+ π^+) / B (D^+ \to K^- π^+ π^+) = 0.0311 \pm 0.0018 ^ {+0.0016}_{-0.0026}$ and $B(D_s^+ \to π^+ π^- π^+) / B(D_s^+ \to ϕπ^+) = 0.245 \pm 0.028^{+0.019}_{-0.012}$. Using a coherent amplitude analysis to fit the Dalitz plot of the $D^+ \to π^- π^+ π^+$ decay, we find strong evidence for a scalar resonance of mass $478^{+24}_{-23} \pm 17 $MeV/$c^2$ and width $324^{+42}_{-40} \pm 21$ MeV/$c^2$, compatible with what is expected for the isoscalar meson $σ$ >. The $D^+ \to σ(500) π^+$ fraction accounts for approximately half of all three-charged-pion decays of the $D^+$ . From the Dalitz plot analysis of the $D_s^+ \to π^- π^+ π^+$ decay events, we find significant contributions from the channels $ρ^0(770)π^+$, $ρ^0(1450)π^+$, $f_0(980)π^+$, $f_2(1270)π^+$, and $f_0(1370)π^+$. We also present new measurement of the masses and widths of the isoscalar resonances $f_0(980)$ and $f_0(1370)$.

hep-ex↗

arXiv1997

A Phenomenological Analysis of Non-resonant Charm Meson Decays

We analyse the consequences of the usual assumption of a constant function to fit non-resonant decays from experimental Dalitz plot describing charmed meson decays. We first show, using the $D^+\to \bar{K}^0π^+π^0$ decay channel as an example, how an inadequate extraction of the non-resonant contribution could yield incorrect measurements for the resonant channels. We analyse how the correct study of this decay will provide a test for the validity of factorization in D meson decays. Finally, we show how form factors could be extracted from non-resonant decays. We particularly discuss about the form factor that can be measured from the $D^+_s\to π^-π^+π^+$ decay. We emphasize on its relevance for the study of the decay $τ\to ν_τ 3π$ and the extraction of the $a_1$ meson width.

hep-ph↗