Published 1981 | Version v1
Report Open

Observation of pion excited state- a new pseudoscalar meson

Creators

  • 1. Joint Inst. for Nuclear Research, Dubna (USSR). Lab. of Nuclear Problems
  • 2. Milan Univ. (Italy). Ist. di Fisica

Description

Performing a partial wave analysis of the π+π-π- system produced in a diffraction dissociation of an incident 40 GeV/c π- meson on Be, C, Al, Si, Ti, Cu, Ag, Ta, Pb nuclei a new pseudoscalar meson of 1.205+-0.007 GeV/c2 mass and of 0.320+-0.035 GeV/c2 width with pion quantum numbers which are radial excitations of quark structure of pion has been observed. The experiment has been carried out using JINR magnetic spectrometers on Serpukhov accelerator. 110,000 events have been analysed. As a result, it has been observed that phase variation of the 3π system with O-S quantum numbers is 85 deg on the width of resonance and it is constant relative to resonance phase of 1+S wave. Mass spectra of the O-S state are well described by the Breit-Wigner relativistic formula with slowly varying exponential background

Availability note (English)

MF available from INIS under the Report Number.

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Additional details

Additional titles

Original title (Russian)
Обнаружение возбужденного состояния пиона нового псевдоскалярного мезона
Augmented title (English)
Be, C, Al, Si, Ti, Cu, Ag, Ta, Pb targets

Publishing Information

Imprint Pagination
4 p.
Report number
JINR-R--1-81-556

INIS

Country of Publication
USSR
Country of Input or Organization
USSR
INIS RN
13704796
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
EXCITED STATES; EXPERIMENTAL DATA; GEV RANGE 10-100; MASS; MASS SPECTRA; MULTIPERIPHERAL MODEL; NUCLEI; PARTIAL WAVES; PARTICLE PRODUCTION; PARTICLE WIDTHS; PION MINUS REACTIONS; PIONS MINUS; PIONS PLUS; PSEUDOSCALAR MESONS; QUANTUM NUMBERS
Descriptors DEC
ANTIMATTER; ANTIMESONS; ANTIPARTICLES; BOSONS; DATA; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; GEV RANGE; HADRON REACTIONS; HADRONS; INFORMATION; INTERACTIONS; MATHEMATICAL MODELS; MATTER; MESON REACTIONS; MESONS; NUCLEAR REACTIONS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PROPERTIES; PERIPHERAL MODELS; PION REACTIONS; PIONS; PSEUDOSCALAR ANTIMESONS; SPECTRA

Optional Information

Notes
4 refs.; 2 figs.; submitted to the journal JETP Lett. and 6. All-union conference on problems of high energy physics, Dubna, 1981.