A Study of Xi_c(2980)^+ and Xi_c(3077)^+

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We present a study of two states decaying to {Lambda}{sub c}{sup +} K{sup -} {pi}{sup +} using the BABAR detector at the SLAC PEP-II asymmetric-energy e{sup +}e{sup -} storage rings. We use an integrated luminosity of 288.5 fb{sup -1} collected at the center-of-mass energy {radical}s = 10.58 GeV, near the peak of the {Upsilon}(4S) resonance, plus 27.2 fb{sup -1} collected approximately 40MeV below this energy. We search for the particles {Xi}{sub c}(2980){sup +} and {Xi}{sub c}(3077){sup +}, recently discovered by the Belle Collaboration, in their decays to {Lambda}{sub c}{sup +}K{sup -}{pi}{sup +}, where {Lambda}{sub c}{sup +} {yields} pK{sup -}{pi}{sup +}. ... continued below

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Aubert, B. August 18, 2006.

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We present a study of two states decaying to {Lambda}{sub c}{sup +} K{sup -} {pi}{sup +} using the BABAR detector at the SLAC PEP-II asymmetric-energy e{sup +}e{sup -} storage rings. We use an integrated luminosity of 288.5 fb{sup -1} collected at the center-of-mass energy {radical}s = 10.58 GeV, near the peak of the {Upsilon}(4S) resonance, plus 27.2 fb{sup -1} collected approximately 40MeV below this energy. We search for the particles {Xi}{sub c}(2980){sup +} and {Xi}{sub c}(3077){sup +}, recently discovered by the Belle Collaboration, in their decays to {Lambda}{sub c}{sup +}K{sup -}{pi}{sup +}, where {Lambda}{sub c}{sup +} {yields} pK{sup -}{pi}{sup +}. We find a signal with 7.0{sigma} significance for the {Xi}{sub c}(2980){sup +} state with a mass difference with respect to the {Lambda}{sub c}{sup +} of (680.6 {+-} 1.9 {+-} 1.0)MeV/c{sup 2} (first error is statistical and second error is systematic). The measured width for this state is (23.6 {+-} 2.8 {+-} 1.3)MeV, and the yield is 284 {+-} 45 {+-} 46 events. We find a signal with 8.6{sigma} significance for the {Xi}{sub c}(3077){sup +} state with a mass difference with respect to the {Lambda}{sub c}{sup +} of (790.0 {+-} 0.7 {+-} 0.2) MeV/c{sup 2}, a width of (6.2 {+-} 1.6 {+-} 0.5)MeV, and a yield of 204 {+-} 35 {+-} 12 events. The {Xi}{sub c}(2980){sup +} is found to decay resonantly through the intermediate state {Sigma}{sub c}(2455){sup ++}K{sup -} with 4.9{sigma} significance and non-resonantly to {Lambda}{sub c}{sup +} with 4.1{sigma} significance. With 5.8{sigma} significance, the {Xi}{sub c}(3077){sup +} is found to decay resonantly through {Sigma}{sub c}(2455){sup ++}K{sup -}, and with 4.6{sigma} significance, it is found to decay through {Sigma}{sub c}(2520){sup ++}K{sup -}. The significance of the signal for the non-resonant decay {Xi}{sub c}(3077){sup +} {yields} {Lambda}{sub c}{sup +} K{sup -} {pi}{sup +} is 1.4{sigma}. These results are preliminary.

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  • Contributed to 33rd International Conference on High Energy Physics (ICHEP 06), Moscow, Russia, 26 Jul - 2 Aug 2006

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  • Report No.: SLAC-PUB-11980
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 889672
  • Archival Resource Key: ark:/67531/metadc874447

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  • August 18, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 10:41 p.m.

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Aubert, B. A Study of Xi_c(2980)^+ and Xi_c(3077)^+, article, August 18, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc874447/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.