The e sup + , e sup minus background at Relativistic Heavy Ion Collider (RHIC) generated by beam crossing

Conference · Fri Aug 10 04:00:00 EDT 1990

OSTI ID:6835765

Rhoades-Brown, M J; Ludlam, T ^[1]; Wu, J; Bottcher, C; Strayer, M ^[2]

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1. Brookhaven National Lab., Upton, NY (USA)
2. Oak Ridge National Lab., TN (USA)

At the Brookhaven Relativistic Heavy Ion Collider (RHIC), fully stripped heavy ions will circulate in each of two rings up to beam energies of 250 (Z/A) GeV/u. During the beam crossing, the peripheral electromagnetic interaction between the heavy ions is sufficient to induce copious production of di-lepton pairs. These pairs are a potential source of background for the detectors at RHIC. In this paper we discuss the expected number of e{sup +},e{sup {minus}} pairs, given the accepted initial luminosity value L of the collider. More importantly, we also calculate the differential cross sections for the angle, energy, rapidity and momentum distribution of the leptons. Using the luminosity L of the collider, these differential cross sections are normalized to the expected number of leptons per second. We restrict ourselves to e{sup +},e{sup {minus}} production, a discussion of {mu}{sup +},{mu}{sup {minus}} and {tau}{sup +}{tau}{sup {minus}} distributions will be published later. The results are presented for the expected worst case, namely {sup 197}Au{sup 79+} ions at a beam kinetic energy of 100 GeV/u. This is forseen to be the heaviest ion for high luminosity experiments at RHIC. We note for a given energy, the cross section for e{sup +},e{sup {minus}} production scales as Z{sup 4}, where Z is the atomic number of the ions.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6835765
• Report Number(s): BNL-45003; CONF-900772--2; ON: DE90017203
• Country of Publication: United States
• Language: English

Related Subjects

645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
651920* -- Nuclear Properties & Reactions
A=190-219
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
BEAM LUMINOSITY
BROOKHAVEN RHIC
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FORM FACTORS
GOLD 197 REACTIONS
GOLD 197 TARGET
HEAVY ION ACCELERATORS
HEAVY ION REACTIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
NUCLEAR REACTIONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
STORAGE RINGS
TARGETS