Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV - INSPIRE

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Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

G. Agakishiev
(
- Dubna, JINR
)
,
A. Balanda
(
- Jagiellonian U.
)
,
D. Belver
(
- Santiago de Compostela U.
)
,
A. Belyaev
(
- Dubna, JINR
)
,
J.C. Berger-Chen
(
- Munich, Tech. U., Universe
)

Mar 12, 2014

16 pages

Published in:

Eur.Phys.J.A 50 (2014) 82

Published: 2014

e-Print:

1403.3054 [nucl-ex]

DOI:

10.1140/epja/i2014-14082-1

View in:

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Abstract: (arXiv)

We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of

3.5

GeV based on data measured with HADES. The exclusive channels

pp \rightarrow np\pi^{+}

and

pp \rightarrow pp\pi^{0}

as well as

pp \rightarrow ppe^{+}e^{-}

are studied simultaneously for the first time. The invariant masses and angular distributions of the pion-nucleon systems were studied and compared to simulations based on a resonance model ansatz assuming saturation of the pion production by an incoherent sum of baryonic resonances (R) with masses

<2~

GeV/

c^2

. A very good description of the one-pion production is achieved allowing for an estimate of individual baryon-resonance production-cross-sections which are used as input to calculate the dielectron yields from

R\rightarrow pe^+e^-

decays. Two models of the resonance decays into dielectrons are examined assuming a point-like

RN \gamma^*

coupling and the dominance of the

\rho

meson. The results of model calculations are compared to data from the exclusive

ppe^{+}e^{-}

channel by means of the dielectron and

pe^+e^-

invariant mass distributions.

Note:

17 pages, 14 figures

baryon resonance: production
resonance: model
p p: inelastic scattering
nucleon resonance: decay
pi: hadroproduction
electron: pair production
angular distribution
mass spectrum
saturation
HADES

References(50)

Figures(36)

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