Study of Charmed Baryon Sigma(C)(2800) Production at the BaBar Experiment

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This dissertation reports on a study of search for an orbitally excited state of charmed baryons {Sigma}{sub c}{sup 0}(2800) and {Sigma}{sub c}{sup ++}(2800). They measure the widths, momentum spectrum and production cross-section for these states decaying into a {Lambda}{sub c}{sup +} and a charged {pi}. The analysis uses 230 fb{sup -1} of data collected at BABAR detector operating at PEP-II collider at Stanford Linear Accelerator Center. The data is collected in the region of {Upsilon}(4S) an {approx} 40 MeV below the resonance. {Lambda}{sub c}{sup +} baryon is reconstructed in the decay mode pK{sup -}{pi}{sup +}. The {Sigma}{sub c}(2800) baryon production ... continued below

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198 pages

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Ahmded, Shamona & /SUNY, Stony Brook February 29, 2008.

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This dissertation reports on a study of search for an orbitally excited state of charmed baryons {Sigma}{sub c}{sup 0}(2800) and {Sigma}{sub c}{sup ++}(2800). They measure the widths, momentum spectrum and production cross-section for these states decaying into a {Lambda}{sub c}{sup +} and a charged {pi}. The analysis uses 230 fb{sup -1} of data collected at BABAR detector operating at PEP-II collider at Stanford Linear Accelerator Center. The data is collected in the region of {Upsilon}(4S) an {approx} 40 MeV below the resonance. {Lambda}{sub c}{sup +} baryon is reconstructed in the decay mode pK{sup -}{pi}{sup +}. The {Sigma}{sub c}(2800) baryon production at continuum is observed to be quite significant for x{sub p} > 0.7, where x{sub p} = p/{radical}E{sup 2}+M{sup 2} is the scaled momentum and varies from 0.0 to 1.0. The momentum spectrum is measured by considering the corrected yield for momentum bins above x{sub p} > 0.5 and can be parameterized very well by a Peterson function, given by: dN/dx{sub p} {proportional_to} 1/x{sub p}(1 - 1/x{sub p} - {epsilon}/1-x{sub p}){sup 2}. The values for the peterson parameter {epsilon}, are found to be 0.050 {+-} 0.010 for {Sigma}{sub c}{sup 0}(2800) and 0.057 {+-} 0.012 for {Sigma}{sub c}{sup ++}(2800). They use the momentum spectrum to evaluate the production cross-sections to be: {sigma}(e{sup +}e{sup -} {yields} {Sigma}{sub c}{sup 0}(2800)X). {Beta}({Sigma}{sub c}{sup 0}(2800) {yields} {Lambda}{sub c}{sup +}{pi}{sup -}) = 1.36 {+-} 0.42 pb and {sigma}(e{sup +}e{sup -} {yields} {Sigma}{sub c}{sup ++}(2800)X).{Beta}({Sigma}{sub c}{sup ++}(2800){yields} {Lambda}{sub c}{sup +}{pi}{sup +}) = 1.68 {+-} 0.54 pb. The authors also measure the width to be 65.6 {+-} 14.9 MeV and 67.7 {+-} 16 MeV, for the neutral and charged modes, respectively, and the corresponding observed mass differences ({Lambda}{sub c}{sup +}{pi} - {Lambda}{sub c} + 2.285), are 2.8008 {+-} 0.0023GeV/c{sup 2} and 2.7980 {+-} 0.0028GeV/c{sup 2}. The uncertainty here is statistical only.

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198 pages

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  • Report No.: SLAC-R-887
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 924757
  • Archival Resource Key: ark:/67531/metadc895744

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 29, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 10:34 p.m.

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Ahmded, Shamona & /SUNY, Stony Brook. Study of Charmed Baryon Sigma(C)(2800) Production at the BaBar Experiment, thesis or dissertation, February 29, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc895744/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.