Study of η ′ → η π + π − Dalitz plot Dorofeev, V.; Dzheliadin, R.; Ekimov, A. ...
Physics letters. B,
07/2007, Letnik:
651, Številka:
1
Journal Article
Recenzirano
The Dalitz plot of the
η
′
→
η
π
+
π
−
decay is studied using the data collected with the VES spectrometer in two different exclusive reactions,
π
−
p
→
η
′
n
(charge-exchange) and
π
−
N
→
η
′
π
−
N
...(diffractive-like production). The
η mesons from
η
′
decays were detected in the
η
→
γ
γ
mode. The coefficients for the matrix element squared decomposition are measured on the largest statistics of
η
′
decays reported so far; there are
∼
13.6
×
10
3
and
∼
6.5
×
10
3
decays after background subtraction in charge-exchange and diffractive-like production, respectively.
The isospin-violating decay
f
1
(1285) → π
+
π
-
π
0
has been studied at the VES facility. This study is based on the statistics acquired in π
-
Be
interactions at 27, 36.6 and 41 GeV/
c
in the ...diffractive reaction π
-
N
→ (
f
1
π
-
)
N
. The
f
1
(1285) → π
+
π
-
π
0
decay is observed. The preliminary ratio of decay probabilities
BR
(
f
1
(1285) → π
+
π
-
π
0
) to
BR
(
f
1
(1285) → ηπ
+
π
-
)
.
BR
(η → γγ) is ∼ 2% .
The isospin violating decay $f_1(1285)\to\pi^+\pi^-\pi^0$ has been studied at
VES facility. This study is based at the statistics acquired in $\pi^- Be$
interactions at 27, 36.6 and 41 GeV/c in ...diffractive reaction $\pi^- N \to (f_1
\pi^-) N$. The $f_1(1285) \to \pi^+\pi^-\pi^0$ decay is observed. The ratio of
decay probabilities $BR(f_1(1285) \to \pi^+\pi^-\pi^0)$ to $BR(f_1(1285) \to
\eta \pi^+\pi^-) \cdot BR(\eta \to \gamma\gamma)$ is $\sim\:1.4%$.
Phys.Lett.B651:22-26,2007 Dalitz plot of the $\eta' \to \eta\pi^+\pi^-$ decay is studied using the data
collected with the VES spectrometer in two different exclusive reactions. The
coefficients for ...the matrix element squared decomposition are measured on the
largest statistics of $\eta'$ decays reported so far.
The isospin violating decay \(f_1(1285)\to\pi^+\pi^-\pi^0\) has been studied at VES facility. This study is based at the statistics acquired in \(\pi^- Be\) interactions at 27, 36.6 and 41 GeV/c in ...diffractive reaction \(\pi^- N \to (f_1 \pi^-) N\). The \(f_1(1285) \to \pi^+\pi^-\pi^0\) decay is observed. The ratio of decay probabilities \(BR(f_1(1285) \to \pi^+\pi^-\pi^0)\) to \(BR(f_1(1285) \to \eta \pi^+\pi^-) \cdot BR(\eta \to \gamma\gamma)\) is \(\sim\:1.4%\).
Dalitz plot of the \(\eta' \to \eta\pi^+\pi^-\) decay is studied using the data collected with the VES spectrometer in two different exclusive reactions. The coefficients for the matrix element ...squared decomposition are measured on the largest statistics of \(\eta'\) decays reported so far.
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