Study of the reaction $pi$$sup +$n $Yields$ p$pi$$sup 0$$pi$$sup 0$ at 2.1 GeV/c

Journal Article · Sat Dec 01 04:00:00 EST 1973 · Phys. Rev., D, v. 8, no. 11, pp. 3794-3807

OSTI ID:4306182

Braun, K J; Cline, D B

Using the reaction pi /sup + d yields pp (MM) at 2.13 GeV/c with photons from the final-state pi /sup o'/s detected by tantalum plates in the 30- in. ANL bubble chamber, a 2 pi /sup o/ mass spectrum has been obtained in several ways. This spectrum is found to be in good agreement with phase-space expectations and presents no evidence for the production of a narrow'' epsilon ( GAMMA <200 MeV). The 2 pi /sup o/ cross section for DELTA /sup 2/ < 15 mu / sup 2/ is 386 plus or minus 80 mu b. pi pi production and scattering angular distributions are presented. Good agreement with the onc-pion-exchange model is noted. Assuming that the ratios of peripheral pion-production cross sections are equal to their pole values, a new method for extracting pi pi seattering parameters is discussed. Using this method the I = O s-wave phase shift is uniquely determined from threshold to I GeV/c/sup 2/ and found to be similar to the so-called UP-DOWN solutions of s-p wave interference analyses. In addition, the ratios of I = 0 to I = 2 s-wave scattering phase shifts and scattering lengths are found to be equal to -(3.2/sup +1.5//sub -1.0/) near pi pi threshold. Using a dispersion sum rule, t he pi pi scattering lengths are found to be a/sub o/= +(0.15 plus or minus 0.08) mu /sup -1/ and a/ sub 2/ = - (0.05 plus or minus 0.01) mu /sup -1/. (auth)

• Research Organization: University of Wisconsin, Madison, Wisconsin 53706
• NSA Number: NSA-29-027818
• OSTI ID: 4306182
• Journal Information: Phys. Rev., D, v. 8, no. 11, pp. 3794-3807, Journal Name: Phys. Rev., D, v. 8, no. 11, pp. 3794-3807; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

CROSS SECTIONS-- GEV RANGE 01-10-- MISSING MASS-- OPE MODEL-- PHASE SPACE-- PION-DEUTERON INTERACTIONS-- PION-NEUTRON INTERACTIONS-- PIONS NEUTRAL-- PIONS PLUS-- PROTONS
N64140* --Physics (High Energy)--Particle Interactions &amp; Properties (Experimental)--Strong (Meson-induced)
PHASE SHIFT-- PION-PION INTERACTIONS-- PIONS NEUTRAL-- S WAVES-- SCATTERING LENGTHS
PION-DEUTERON INTERACTIONS