Analysis Of Pi P Right Arrow Pi Pi0p Reaction Near Threshold

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (685 download)

DOWNLOAD NOW!

Download or read book Reaction [pi]N [yields] [pi][pi]N Near Threshold written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The LAMPF E1179 experiment used the [pi][sup 0] spectrometer and an array of charged particle range counters to detect and record [pi][sup +][pi][sup 0], [pi][sup 0]p, and [pi][sup +][pi][sup 0]p coincidences following the reaction [pi][sup +]p [yields] [pi][sup 0][pi][sup +]p near threshold. The total cross sections for single pion production were measured at the incident pion kinetic energies 190, 200, 220, 240, and 260 MeV. Absolute normalizations were fixed by measuring [pi][sup +]p elastic scattering at 260 MeV. A detailed analysis of the [pi][sup 0] detection efficiency was performed using cosmic ray calibrations and pion single charge exchange measurements with a 30 MeV [pi][sup [minus]] beam. All published data on [pi]N [yields] [pi][pi]N, including our results, are simultaneously fitted to yield a common chiral symmetry breaking parameter [xi] =[minus]0.25[plus-minus]0.10. The threshold matrix element [vert-bar][alpha][sub 0]([pi][sup 0][pi][sup +]p)[vert-bar] determined by linear extrapolation yields the value of the s-wave isospin-2 [pi][pi] scattering length [alpha][sub 0][sup 2]([pi][pi]) = [minus]0.041[plus-minus]0.003 m[sub [pi]][sup [minus]1], within the framework of soft-pion theory.