Predictive ability of QCD sum rules for excited baryons
نویسندگان
چکیده
منابع مشابه
Predictive Ability of QCD Sum Rules for Excited Baryons
The masses of octet baryons are calculated by the method of QCD sum rules. Using generalized interpolating fields, three independent sets of QCD sum rules are derived which allow the extraction of low-lying N* states with spin-parity 1/2+, 1/2and 3/2in both the non-strange and strange channels. The predictive ability of the sum rules is examined by a Monte-Carlo based analysis procedure in whic...
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QCD sum rules for decuplet baryon two-point functions are investigated using a comprehensive Monte-Carlo based procedure. In this procedure, all uncertainties in the QCD input parameters are incorporated simultaneously, resulting in realistic estimates of the uncertainties in the extracted phenomenological parameters. Correlations between the QCD input parameters and the phenomenological parame...
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In this talk, we focus on the L = 1 excited charm mesons. It is heuristic to illustrate them in the following way, although it is not accurate (L is not a conserved quantity). For the ground state (L = 0) mesons which we are familiar with, there are two states with the J quantum numbers: D(0) and D(1). Their difference only lies in the heavy quark spin direction. For the L = 1 case, there are f...
متن کاملErratum: Isospin violation in QCD sum rules for baryons
PACS number(s): 11.55.Hx. , 11.30.Hv, 14.20.Dh, 99.10.+g In a recent paper [1], it was brought to our attention that some numerical factors in our equations were in error. In Eq. (3.12), the second sum rule for the nucleon, the term reading —za2 should read —za . As a consequence, the term sa2 in Eq. (3.34) is replaced by &a . There is also a change in the sum rule for the Z hyperons. In Eq. (3...
متن کاملIsospin violation in QCD sum rules for baryons.
We thoroughly analyze isospin-violating effects in QCD sum rules for the masses of nucleons, X, and :hyperons. After comparing with experimental mass splittings in isotopic multiplets, we obtain for the isospin breaking in the quark condensate (0~uu —dd ~0) /(0~uu ~0) =(2+1)X 10 ', a value significantly smaller than the one usually adopted. We present arguments in favor of our result and critic...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2002
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.66.014014