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Article
Partial widths for the decays η:(1295) →γγ and η:(1440) →γγ
We discuss γγ partial widths of pseudoscalar/isoscalar mesons η:(M) in the mass region M∼ 1000–1500 MeV. The transition amplitudes η:(1295) →γγ and η:(1440) →γγ are studied within an assumption that the decaying...
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Article
Evidence for two isospin zeroJ PC=2−+ mesons at 1645 and 1875 MeV
Data on \(\bar pp \to \eta \pi ^0 \pi ^0 \pi ^0 \) taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for t...
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Article
Meson radiative decays and anomaly physics, a test of QCD
We discuss in a wider context the connection of the results previously obtained on the decay processes η/η′→π+π−γ with respect to the ξ test of QCD proposed by Chanowitz. We show that one can add consistently to ...
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Article
First observations of Pontecorvo reactions with a recoiling neutron
We report the first observations of Pontecorvo reactions of the type ¯pd →Xn. We fully reconstruct the outgoing meson and, for antiprotons stopped in liquid deuterium, we measure: BR(¯pd→π0)=(7.03±0.72)×10−6, BR(...
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Article
Antiproton annihilation at rest in liquid deuterium into π−π0π0pS
With the Crystal Barrel detector, the final state π−π0π0pS at rest in liquid deuterium was measured for the first time. A preliminary partial-wave analysis was performed, which required two interesting features: ...
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Article
High-statistics analysis of \(\bar pp \to \pi ^0 \pi ^0 \pi ^0 \) at restat rest
Antiproton-proton annihilation at rest into 3π0 is analysed based on a data sample of about 500 000 high-quality 3π0 events. In this high-statistics Dalitz plot two structures in the region of π0π0 invariant mass...
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Article
Antiproton-proton annihilation in flight
This is an overview of the preliminary results of \(\bar pp\) annihilation at incident
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Article
Partial-wave analysis of ππη in \(\bar pp\) annihilation at restannihilation at rest
A new isovector scalar πη resonance with a mass of 1450 MeV is observed in a high-statistics study of \(\bar pp\) ...
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Article
Test of chiral perturbation theory in η decays
The decay of the η-meson into three pions plays an important role as a test of low-energy QCD calculations in the framework of chiral perturbation theory. Previous experiments show results that are inconclusiv...
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Article
\(\bar pp\) Annihilation at rest into K L 0 K S 0 π0π0Annihilation at rest into K L 0 K S 0 π0π0
Investigations of purely neutral final states in \(\bar pp\) annihilation are possible for the first time with the...
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Article
HADRON ’93: Experiments
In this summary, we briefly recall what may be considered as the main new experimental results that have been presented at HADRON ’93: on proton-proton and photon-proton cross-sections, on the first HERA resul...
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Article
Hidden and open \(\bar ss\) production in \(\bar pp\) annihilation at restannihilation at rest
New branching ratios for \(\bar pp\) annihilation at rest into final states with a
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Article
New results from crystal barrel
Results are presented on meson spectroscopy, two-body final states and meson decay modes observed in \(\bar pp\) a...
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Article
Antiproton-proton annihilation at rest into two-body final states
We report measurements of branching ratios for production of a series of two meson final states in \(\bar p\) p anni...
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Article
Bose-Einstein correlations inpp collisions at 400 GeV/c
Bose-Einstein correlations among identically charged pions produced inpp collisions at 400 GeV/c are studied using the EHS spectrometer. Empoying the Kopylov-Podgoretskii parametrization, the average size of the ...
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Article
Inclusive particle production in 400 GeV/c pp-interactions
We report on a study of inclusive particle production in pp-interactions at 400 GeV/c. The data are based on 472 K reconstructed events recorded in the NA 27 experiment using the LEBC-EHS facility at CERN. The...
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Article
Experimental results on proton diffractive dissociation
Properties of proton diffractive dissociation have been investigated for four-prong final states in proton-proton reactions at 360 GeV/c, in particular forpp→ppπ +π− mπ 0(m=0,1,2). Mass distributions and decay an...
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Article
Vector meson production in π− p interactions at 360 GeV/c
The inclusive production of vector mesons (charged ρ(770), ω(783), ϕ(1020) and neutralK *(892)) in π− p interactions at 360 GeV/c is studied. The data are based on 160 000 reconstructed events recorded in the NA ...
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Article
Bose-Einstein correlations for pions produced inp p collisions at 360 GeV/c
Correlations among identically charged pions were measured for pions produced inp p collisions at 360 GeV/c using the EHS spectrometer. The effective radius for pion production was determined to be 1.02±0.20 fm w...
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Article
Exclusive hadron branching ratios of theD meson