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Direct observation of the strange b baryon Xib-.

Abstract:

We report the first direct observation of the strange b baryon Xi(b)- (Xi(b)+). We reconstruct the decay Xi(b)- -->J/psiXi-, with J/psi-->mu+mu-, and Xi--->Lambdapi--->ppi-pi- in pp collisions at square root of s =1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(b)- candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of...

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Publication status:
Published

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Journal:
Physical review letters
Volume:
99
Issue:
5
Pages:
052001
Publication date:
2007-08-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:47101f8a-bc2f-4ebc-8905-eabd3fe3f42e
Source identifiers:
28679
Local pid:
pubs:28679
Language:
English
Keywords:

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