Realistic equivalent-photon yields in heavy-ion collisions

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.3690· OSTI ID:5834271

Cahn, R N ^[1]; Jackson, J D ^[2]

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1. Lawrence Berkeley Laboratory, University of California, Berkeley, CA (USA)
2. Physics Department, University of California at Berkeley, Berkeley, CA (USA) Lawrence Berkeley Laboratory, University of California, Berkeley, CA (USA)

Heavy-ion collisions are a potentially prolific source of {gamma}{gamma} collisions at very-high-energy colliders. However, their utility is limited to events in which the nuclei miss each other. The Weizsaecker-Williams approximation in impact-parameter space is used to evaluate the consequent reduction in photon flux below that obtained by including the effect of the size of the nucleus only through the elastic form factor. The effective luminosity ({tau}/{ital Z}{sup 4}){ital dL-script}/{ital d}{tau} is shown for all relevant circumstances to be a function of the single variable {ital z}={ital mR}/{gamma}, where {ital m} is the mass of the created system, {ital R} is the nuclear radius, and {gamma} is the center-of-mass-system Lorentz factor of each nucleus. A graph and a simple parametrization are given of ({tau}/{ital L-script}{sub 0}){ital dL-script}/{ital d}{tau} as a function of {ital z}. The effective cross section for production of a Higgs boson with a mass of 100 (150) GeV using Pb-Pb-generated {gamma}{gamma} collisions is reduced by a factor of roughly 1/2.4 (1/3) at the Superconducting Super Collider and a factor of 1/4.6 (1/7) at the CERN Large Hadron Collider by the exclusion of events in which the nuclei collide.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5834271
• Journal Information: Physical Review, D (Particles Fields); (USA), Vol. 42:11; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HEAVY ION REACTIONS
PARTICLE PRODUCTION
HIGGS BOSONS
PHOTON-PHOTON INTERACTIONS
ANNIHILATION
CROSS SECTIONS
ELASTIC SCATTERING
FORM FACTORS
IMPACT PARAMETER
LEAD
LUMINOSITY
MASS
NUCLEON-NUCLEON INTERACTIONS
SUPERCONDUCTING SUPER COLLIDER
TEV RANGE
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
CHARGED-PARTICLE REACTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
METALS
NUCLEAR REACTIONS
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
POSTULATED PARTICLES
SCATTERING
STORAGE RINGS
645202* - High Energy Physics- Particle Interactions & Properties-Theoretical- Electromagnetic Interactions & Properties
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