We present a new, model-independent method to analyze radiative decays of mesons to a vector, isovector pair of pions of invariant mass square below the first significant ππ threshold in the vector ...channel. It is based on a combination of chiral perturbation theory and dispersion theory. This allows for a controlled inclusion of resonance physics without the necessity to involve vector meson dominance explicitly. As an example, the method is applied to an analysis of the reactions η→π+π−γ and η′→π+π−γ.
Dispersive analysis for η→γγ Hanhart, C.; Kupść, A.; Meißner, U.-G. ...
The European physical journal. C, Particles and fields,
2013/12, Letnik:
73, Številka:
12
Journal Article
Recenzirano
A dispersion integral is derived that connects data on
η
→
π
+
π
−
γ
to the
η
→
γγ
∗
transition form factor. A detailed analysis of the uncertainties is provided. We find for the slope of the
η
...transition form factor at the origin
. Using an additional, plausible assumption, one finds for the corresponding slope of the
η
′ transition form factor,
. Both values are consistent with all recent data, but differ from some previous theoretical analyses.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A dispersion integral is derived that connects data on eta arrow right pi super(+) pi super(-) gamma to the eta arrow right ...gamma gamma super() transition form factor. A detailed analysis of the uncertainties is provided. We find for the slope of the eta transition form factor at the origin ... Using an additional, plausible assumption, one finds for the corresponding slope of the eta ' transition form factor, ... Both values are consistent with all recent data, but differ from some previous theoretical analyses.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) A dispersion integral is derived that connects data on ηarrow rightπ ^sup +^ π ^sup -^ γ to the ηarrow rightγγ ^sup ^ ...transition form factor. A detailed analysis of the uncertainties is provided. We find for the slope of the η transition form factor at the origin ... Using an additional, plausible assumption, one finds for the corresponding slope of the η' transition form factor, ... Both values are consistent with all recent data, but differ from some previous theoretical analyses.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Dispersive analysis for η → γ[γ.sup.] Hanhart, C; Kupsc, A; Meissner, U.-G ...
The European physical journal. C, Particles and fields,
12/2013, Letnik:
73, Številka:
12
Journal Article
Recenzirano
A dispersion integral is derived that connects data on η → π.sup.+π.sup.-γ to the η → γγ.sup.* transition form factor. A detailed analysis of the uncertainties is provided. We find for the slope of ...the η transition form factor at the origin b.sub.η = (2.05.sup.+0.22.sub.-0.10 GeV.sup.-2. Using an additional, plausible assumption, one finds for the corresponding slope of the η' transition form factor, b.sub.η' = (1.53.sup.+0.15.sub.-0.08) GeV.sup.- 2. Both values are consistent with all recent data, but differ from some previous theoretical analyses.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
An exclusive measurement of the decay η→π+π−γ has been performed at the WASA facility at COSY. The η mesons were produced in the fusion reaction pd→He3 X at a proton beam momentum of 1.7 GeV/c. ...Efficiency corrected differential distributions have been extracted based on 13960±140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of η→π+π−γ. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the π+π− system.
Dispersive analysis for eta ->gamma gamma Hanhart, C.; Kupsc, Andrzej; Meissner, U-G ...
The European physical journal. C, Particles and fields,
2013, Letnik:
73, Številka:
12
Journal Article
Recenzirano
A dispersion integral is derived that connects data on eta ->pi (+) pi (-) gamma to the eta ->gamma gamma (au) transition form factor. A detailed analysis of the uncertainties is provided. We ...find for the slope of the eta transition form factor at the origin . Using an additional, plausible assumption, one finds for the corresponding slope of the eta' transition form factor, . Both values are consistent with all recent data, but differ from some previous theoretical analyses.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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