Characterization of the PEP-II Colliding-Beam Phase Space by the Boost Method

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We present a novel approach to characterize the colliding-beam phase space at the interaction point of the energy-asymmetric PEP-II B-Factory. The method exploits the fact that the transverse-boost distribution of e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -} events reconstructed in the BABAR detector reflects that of the colliding electrons and positrons. The mean boost direction, when combined with the measured orientation of the luminous ellipsoid, determines the e{sup +}-e{sup -} crossing angles. The average angular spread of the transverse boost vector provides an accurate measure of the angular divergence of the incoming high-energy beam, confirming the presence of a sizeable ... continued below

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3 pages

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Weaver, M.; /SLAC; Kozanecki, W.; /DAPNIA, Saclay; Viaud, B. & U., /Montreal July 19, 2006.

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We present a novel approach to characterize the colliding-beam phase space at the interaction point of the energy-asymmetric PEP-II B-Factory. The method exploits the fact that the transverse-boost distribution of e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -} events reconstructed in the BABAR detector reflects that of the colliding electrons and positrons. The mean boost direction, when combined with the measured orientation of the luminous ellipsoid, determines the e{sup +}-e{sup -} crossing angles. The average angular spread of the transverse boost vector provides an accurate measure of the angular divergence of the incoming high-energy beam, confirming the presence of a sizeable dynamic-{beta} effect. The longitudinal and transverse dependence of the boost angular spread also allow to extract from the continuously-monitored distributions detailed information about the emittances and IP {beta}-functions of both beams during high-luminosity operation.

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3 pages

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  • Contributed to European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006

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  • Report No.: SLAC-PUB-11906
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 887069
  • Archival Resource Key: ark:/67531/metadc886207

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  • July 19, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 10:20 p.m.

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Weaver, M.; /SLAC; Kozanecki, W.; /DAPNIA, Saclay; Viaud, B. & U., /Montreal. Characterization of the PEP-II Colliding-Beam Phase Space by the Boost Method, article, July 19, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc886207/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.