Coherent pair creation from beam-beam interaction

Conference · Fri Sep 01 04:00:00 EDT 1989

OSTI ID:5369697

Chen, Pisin

It has recently been recognized that in future linear colliders, there is a finite probability that the beamstrahlung photons will turn into e{sup +}e{sup {minus}} pairs induced by the same beam-beam field, and this would potentially cause background problems. In this paper, we first review the probability of such a coherent pair creation process. It is seen that the constraint on the beamstrahlung parameter, {Upsilon}, is tight of these coherent pairs to be totally suppressed. We then point out that there exists a minimum energy for the pair-created particles, which scales as {approximately}1/5{Upsilon}. When combining this condition with the deflection angle for the low-energy particles, the constraint on the allowable {Upsilon} value is much relaxed. Finally, we calculate the effective cross section for producing the weak bosons by the low-energy e{sup +}e{sup {minus}} pairs. It is shown that these cross sections are substantial for {Upsilon} > 1. We suggest that this effect can help to autoscan the particle spectrum in the high energy frontier. 10 refs., 2 figs.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 5369697
• Report Number(s): SLAC-PUB-5086; CONF-890803--39; ON: DE90001817
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BEAM DYNAMICS
BEAM-BEAM INTERACTIONS
BOSONS
BREMSSTRAHLUNG
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-LEPTON INTERACTIONS
LINEAR ACCELERATORS
LINEAR COLLIDERS
PAIR PRODUCTION
PARTICLE INTERACTIONS
RADIATIONS
SPECTRA