Consistency of data on soft photon production in hadronic interactions

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.6824· OSTI ID:6941705

Lichard, P ^[1]

---

1. Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)

The glob model of Lichard and Van Hove and the modified soft annihilation model (MSAM) of Lichard and Thompson are used as a phenomenological tool for relating results from various experiments on soft photon production in high energy collisions. The total phenomenological expectation is composed of contributions from classical bremsstrahlung, the soft annihilation model, and the glob model. The empirical excess above the background from hadronic decays at very small longitudinal momenta of photons is well reproduced, as well as that for transverse momenta [ital p][sub [ital T]][approx gt]10 MeV/[ital c]. Some data do not require the glob model and MSAM components in the phenomenological mixture, but do not exclude them. On the basis of consistency of all data with the total theoretical expectation we argue that the results of all experiments are mutually consistent. The models are unable to describe the excess of ultrasoft photons ([ital p][sub [ital T]][approx lt]10 MeV/[ital c]), seen by some, but not all, experiments. This may indicate an as yet unknown projectile-mass-dependent production mechanism. Possible relations of soft photon production to other phenomena are discussed. A simple-to-use, but physically equivalent version of the glob model is developed, which enables an easy check of presented results.

• DOE Contract Number: FG02-88ER40388
• OSTI ID: 6941705
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 50:11; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HADRON-HADRON INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
ANNIHILATION
BREMSSTRAHLUNG
DEEP INELASTIC SCATTERING
TRANSVERSE MOMENTUM
WEAK HADRONIC DECAY
BASIC INTERACTIONS
BOSONS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
PARTICLE DECAY
PARTICLE INTERACTIONS
RADIATIONS
SCATTERING
WEAK PARTICLE DECAY
662340* - Hadron Interactions- (1992-)
662230 - Quantum Chromodynamics- (1992-)
662240 - Models for Strong Interactions- (1992-)