Observation of a Charmed Baryon Decaying to D0 p at a Mass Near 2.94 GeV/c2

Aubert, B.

Stanford Linear Accelerator Center

关键词: Experiment-Hep,Hepex;    Decay Experiment-Hep,Hepex;    Annihilation;    72 Physics Of Elementary Particles And Fields;    Baryons;   

DOI  :  10.2172/878345
RP-ID  :  SLAC-PUB-11786
RP-ID  :  AC02-76SF00515
RP-ID  :  878345

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来源: UNT Digital Library

【 摘 要 】

A search for charmed baryons decaying to D{sup 0}p reveals two states: the {Lambda}{sub c}(2880){sup +} baryon and a previously unobserved state at a mass of [2939.8 {+-} 1.3 (stat.) {+-} 1.0 (syst.)] MeV/c{sup 2} and with an intrinsic width of [17.5 {+-} 5.2 (stat.) {+-} 5.9 (syst.)] MeV. Consistent and significant signals are observed for the K{sup -}{pi}{sup +} and K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} decay modes of the D{sup 0} in 287 fb{sup -1} annihilation data recorded by the BABAR detector at a center-of-mass energy of 10.58 GeV. There is no evidence in the D{sup +}p spectrum of doubly-charged partners. The mass and intrinsic width of the {Lambda}{sub c}(2880){sup +} baryon and relative yield of the two baryons are also measured.