Study of the reaction p + p $Yields$ $delta$$sup ++$(1236) + X$sup 0$ at 205 GeV/c
We have studied inclusive $delta$$sup ++$(1236) production for abs. value (t/sub p$delta$) <1.0 (GeV/c)$sup 2$ in a 50000 picture exposure of the 30- inch hydrogen bubble chamber to a 205 GeV/c proton beam. The inclusive $delta$$sup ++$ cross section for one hemisphere in the center-of-mass system is (1.30 +- 0.14) mb. The mean charged multiplicity of the system recoiling off the $delta$$sup ++$ is in agreement with that for laboratory $pi$$sup -$p interactions at the same energy in the center-of-mass frame. The inclusive $delta$$sup ++$ production is compared to inclusive lambda$sup 0$ and proton production in the same experiment. The connection between $delta$$sup ++$ production and diffraction is discussed. We find that not all $delta$$sup ++$ come from the decay of a diffractively-produced state. The P/subT/$sup 2$ distribution for the $delta$$sup ++$ has a slope of (10.5 +- 0.9) (GeV/c)$sup -2$ for P/sub T/$sup 2$ approximately-less-than0.2 (GeV/c)$sup 2$. This slope, together with the decay angular distribution of the $delta$$sup ++$ at small momentum transfer, suggests a strong pion-exchange contribution to the inclusive process. We compare the data to the expectation of a triple-Regge model with rho- and $pi$-exchange contributions. (AIP)
- Research Organization:
- Argonne National Laboratory, Argonne, Illinois 60439
- NSA Number:
- NSA-33-010385
- OSTI ID:
- 4123669
- Journal Information:
- Phys. Rev., D, v. 12, no. 5, pp. 1260-1271, Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
641003*
*DELTA-1236 RESONANCES- PARTICLE PRODUCTION
*PROTON-PROTON INTERACTIONS- CROSS SECTIONS
BOSON-EXCHANGE MODELS
CHARGE DISTRIBUTION
CRYOGENIC BUBBLE CHAMBERS
DIFFRACTION MODELS
GEV RANGE 100-1000
INCLUSIVE INTERACTIONS
LINEAR MOMENTUM TRANSFER
MULTIPLICITY
PARTICLE RAPIDITY
PIONS
REACTION KINETICS
REGGE POLES
TRANSVERSE MOMENTUM