OBSERVATION OF A NARROW STRUCTURE IN THE PP ELASTIC-SCATTERING OBSERVABLE A(OONN) AT T-KIN=2.11GEV

Authors
BALL J CHAMOUARD PA COMBET M FONTAINE JM KUNNE R LAGNIEL JM LEMAIRE JL MILLERET G SANS JL BYSTRICKY J LEHAR F DELESQUEN A DEMALI M DEMIERRE P HESS R JANOUT ZF LOMON EL RAPIN D VUARIDEL B BARABASH LS JANOUT Z KALINNIKOV VA KAZARINOV YM KHACHATUROV BA MATAFONOV VN PISAREV IL POPOV AA USOV YA BEDDO M GROSNICK D KASPRZYK T LOPIANO D SPINKA H BOUTEFNOUCHET A GHAZIKHANIAN V WHITTEN CA
Citation
J. Ball et al., OBSERVATION OF A NARROW STRUCTURE IN THE PP ELASTIC-SCATTERING OBSERVABLE A(OONN) AT T-KIN=2.11GEV, Physics letters. Section B, 320(1-2), 1994, pp. 206-210
Citations number
26
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
320
Issue
1-2
Year of publication
1994
Pages
206 - 210
Database
ISI
SICI code
0370-2693(1994)320:1-2<206:OOANSI>2.0.ZU;2-L
Abstract
The angular dependence of the pp elastic scattering spin correlation p arameter was measured in the angular range from 60 degrees to 97 degre es CM at 14 energies between 1.96 and 2.23 GeV. A rapid decrease of th e energy dependence of this observable at 90 degrees CM is observed ar ound 2.11 GeV kinetic energy. This agrees with the behavior of A(oonn) predicted on the basis of an exotic six-quark structure. The A(oonn) (90 degrees CM), together with the known differential cross section, a llows the determination of the absolute value of the pure spin-singlet amplitude. The energy dependence of this amplitude shows a shoulder c entered at 2.11 GeV, corresponding to a total mass of 2.735 GeV and an estimated width of 17 MeV.