B baryon production and decays and B hadron lifetimes

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In this paper we review the most recent results concerning B Baryons at CDF and D0, including the observation and the study of the properties of the {Omega}{sub b}{sup -}, {Xi}{sub b}{sup -} and {Sigma}{sub b}{sup {+-}(*)}, the observation of new {Lambda}{sub b}{sup 0} decay modes, and a new measurement of the lifetime of the b hadrons in decays with a J/{Psi}. The {Omega}{sub b}{sup -} baryon is observed through the decay chain {Omega}{sub b}{sup -} {yields} J/{Psi}{Omega}{sup -}, where J/{Psi} {yields} {mu}{sup +}{mu}{sup -}, {Omega}{sup -} {yields} {Lambda}K{sup -}, and {Lambda} {yields} pK{sup -}, using 4.2 fb{sup -1} of ... continued below

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7 pages

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Donati, S. & /Pisa U. /INFN, Pisa January 1, 2010.

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In this paper we review the most recent results concerning B Baryons at CDF and D0, including the observation and the study of the properties of the {Omega}{sub b}{sup -}, {Xi}{sub b}{sup -} and {Sigma}{sub b}{sup {+-}(*)}, the observation of new {Lambda}{sub b}{sup 0} decay modes, and a new measurement of the lifetime of the b hadrons in decays with a J/{Psi}. The {Omega}{sub b}{sup -} baryon is observed through the decay chain {Omega}{sub b}{sup -} {yields} J/{Psi}{Omega}{sup -}, where J/{Psi} {yields} {mu}{sup +}{mu}{sup -}, {Omega}{sup -} {yields} {Lambda}K{sup -}, and {Lambda} {yields} pK{sup -}, using 4.2 fb{sup -1} of data. The {Omega}{sub b}{sup -} mass is measured to be 6054.4 {+-} 6.8(stat.) {+-} 0.9(syst.) MeV/c{sup 2}, and the lifetime 1.13{sub -0.40}{sup +0.53}(stat.) {+-} 0.02(syst.) ps. For the {Xi}{sub b}{sup -} the mass is measured 5790.9 {+-} 2.6(stat.) {+-} 0.8(syst.) MeV/c{sup 2} and the lifetime 1.56{sub -0.25}{sup +0.27}(stat.) {+-} 0.02(syst.) ps. A new accurate measurement of the properties of the resonances {Sigma}{sub b}{sup +}, {Sigma}{sub b}{sup -}, {Sigma}*{sub b}{sup +}, and {Sigma}*{sub b}{sup -} has been performed in 6 fb{sup -1} of data, and the masses have been determined, m({Sigma}{sub b}{sup +}) = 5811.2{sub -0.8}{sup +0.9}(stat.) {+-} 1.7(syst.), m({Sigma}{sub b}{sup -}) = 5815.5{sub -0.5}{sup +0.6}(stat.) {+-} 1.7(syst.), m({Sigma}*{sub b}{sup +}) = 5832.0 {+-} 0.7(stat.) {+-} 1.8(syst.), and m({Sigma}*{sub b}{sup -}) = 5835.0 {+-} 0.6(stat.) {+-} 1.8(syst.). The {Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}(2595){sup +}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, {Lambda}{sub b}{sup 0} {yields} {Lambda}{sub c}(2625){sup +}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, {Lambda}{sub b}{sup 0} {yields} {Sigma}{sub c}(2455){sup ++}{pi}{sup -}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, and {Lambda}{sub b}{sup 0} {yields} {Sigma}{sub c}(2455){sup 0}{pi}{sup +}{pi}{sup -} {yields} {Lambda}{sub c}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}. CDF has performed new measurements of the b hadron lifetimes in decays with a J/{Psi}. The measured lifetimes are the currently most precise determination of the B{sup +}, B{sup 0} and {Lambda}{sub b}{sup 0} lifetimes. The measured values are c{tau}(B{sup +}) = 491.4 {+-} 2.6(stat.) {+-} 2.6(syst.) {micro}m, c{tau}(B) = 451.7 {+-} 3.0(stat.) {+-} 2.5(syst.) {micro}m, and c{tau}({Lambda}{sub b}{sup 0}) = 460.8 {+-} 13.4(stat.) {+-} 4.1(syst.) {micro}m.

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7 pages

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  • Journal Name: PoS FPCP2010:019,2010; Conference: Prepared for Flavor Physics and CP Violation 2010 (FPCP 2010), Turin, Italy, 25-29 May 2010

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  • Report No.: FERMILAB-CONF-10-607-E
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 1016893
  • Archival Resource Key: ark:/67531/metadc840153

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  • January 1, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 25, 2016, 2:59 p.m.

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Donati, S. & /Pisa U. /INFN, Pisa. B baryon production and decays and B hadron lifetimes, article, January 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc840153/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.