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From the same journal

Exclusive measurement of the η→π +π -γ decay

Research output: Contribution to journalArticlepeer-review

Published copy (DOI)

Author(s)

  • P. Adlarson
  • C. Adolph
  • W. Augustyniak
  • W. Bardan
  • T. Bednarski
  • F. S. Bergmann
  • M. Berłowski
  • H. Bhatt
  • K. T. Brinkmann
  • M. Büscher
  • H. Calén
  • H. Clement
  • D. Coderre
  • E. Czerwiński
  • E. Doroshkevich
  • R. Engels
  • W. Erven
  • W. Eyrich
  • P. Fedorets
  • K. Föhl
  • K. Fransson
  • F. Goldenbaum
  • P. Goslawski
  • K. Grigoryev
  • C. O. Gullström
  • C. Hanhart
  • L. Heijkenskjöld
  • J. Heimlich
  • V. Hejny
  • F. Hinterberger
  • M. Hodana
  • B. Höistad
  • M. Jacewicz
  • A. Jany
  • B. R. Jany
  • L. Jarczyk
  • T. Johansson
  • B. Kamys
  • G. Kemmerling
  • O. Khakimova
  • A. Khoukaz
  • S. Kistryn
  • J. Klaja
  • H. Kleines
  • B. Kłos
  • F. Kren
  • W. Krzemień
  • P. Kulessa
  • A. Kupść
  • K. Lalwani
  • S. Leupold
  • B. Lorentz
  • A. Magiera
  • R. Maier
  • B. Mariański
  • P. Marciniewski
  • U. G. Meißner
  • M. Mikirtychiants
  • H. P. Morsch
  • P. Moskal
  • B. K. Nandi
  • S. Niedźwiecki
  • H. Ohm
  • A. Passfeld
  • C. Pauly
  • E. Perez del Rio
  • T. Petri
  • Y. Petukhov
  • N. Piskunov
  • P. Pluciński
  • P. Podkopał
  • A. Povtoreyko
  • D. Prasuhn
  • A. Pricking
  • K. Pysz
  • A. Pyszniak
  • T. Rausmann
  • C. F. Redmer
  • J. Ritman
  • Z. Rudy
  • S. Sawant
  • S. Schadmand
  • A. Schmidt
  • T. Sefzick
  • V. Serdyuk
  • M. Siemaszko
  • R. Siudak
  • T. Skorodko
  • M. Skurzok
  • J. Smyrski
  • V. Sopov
  • R. Stassen
  • J. Stepaniak
  • G. Sterzenbach
  • H. Stockhorst
  • F. Stollenwerk
  • H. Ströher
  • A. Szczurek
  • A. Täschner
  • C. Terschlüsen
  • T. Tolba
  • A. Trzciński
  • R. Varma
  • P. Vlasov
  • G. J. Wagner
  • W. Weglorz
  • A. Winnemöller
  • A. Wirzba
  • M. Wolke
  • A. Wrońska
  • P. Wüstner
  • P. Wurm
  • X. Yuan
  • L. Yurev
  • J. Zabierowski
  • M. J. Zieliński
  • W. Zipper
  • J. Złomańczuk
  • P. Zuprański

Department/unit(s)

Publication details

JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
DatePublished - 20 Jan 2012
Issue number2
Volume707
Number of pages7
Pages (from-to)243-249
Original languageEnglish

Abstract

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.

    Research areas

  • η meson, Box anomaly, Exclusive measurement

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