Spin-3/2 baryons in lattice QCD
نویسندگان
چکیده
We present first results for masses of spin-3/2 baryons in lattice QCD, using a novel fat-link clover fermion action in which only the irrelevant operators are constructed using fat links. In the isospin-1/2 sector, we observe, after appropriate spin and parity projection, a strong signal for the J = 3 2 − state, and find good agreement between the 1 2 + mass and earlier nucleon mass simulations with a spin-1/2 interpolating field. For the isospin-3/2 ∆ states, clear mass splittings are observed between the various 1 2 ± and 3 2 ± channels, with the calculated level orderings in good agreement with those observed empirically.
منابع مشابه
ar X iv : h ep - l at / 0 30 70 25 v 1 1 6 Ju l 2 00 3 SHEP - 0319 Spectroscopy of Doubly - Charmed Baryons in Lattice QCD UKQCD Collaboration
We present results for masses of spin-1/2 and spin-3/2 double-charm baryons in quenched lattice QCD, from an exploratory study using a non-perturbatively improved clover action at β = 6.2. We have studied local operators and we observe, after appropriate projections, a good signal for the ground states. We also present results for single-charmed baryons and spin-splittings for both double-and s...
متن کاملCharmed baryons in lattice QCD
Masses of singly and doubly charmed baryons are calculated in quenched lattice QCD using an improved action of the D234 type on an anisotropic lattice. The mass differences between spin 3/2 and spin 1/2 baryon states are calculated and compared to mass differences between vector and pseudoscalar mesons. The suppression of spin splittings in mesons containing heavy quarks, characteristic of quen...
متن کاملSpectroscopy of triply-charmed baryons from lattice QCD
The spectrum of excitations of triply-charmed baryons is computed using lattice QCD including dynamical light quark fields. The spectrum obtained has baryonic states with well-defined total spin up to 7 2 and the low-lying states closely resemble the expectation from models with an SU(6)×O(3) symmetry. Energy splittings between extracted states, including those due to spin-orbit coupling in the...
متن کاملHeavy Quark Fragmentation into Baryons in a Quark-diquark Model
In the framework of the nonrelativistic QCD and a quark-diquark model of baryons we have obtained the fragmentation functions for heavy quark to split into spin-1/2 and spin-3/2 double heavy baryons. It was predicted the production rates as well as the shape of the energy spectra for the cc− and bc−baryons in the region of Zo peak at LEP collider.
متن کاملSpin splittings among charmed hadrons
The mass differences between the lightest vector and pseudoscalar mesons containing one or two heavy quarks are persistently smaller in quenched lattice simulations than the experimental values[1–3]. Studies of the unquenched theory have found that the discrepancy persists[4]. Fewer lattice simulations have been performed for the mass differences between spin-3/2 and spin-1/2 baryons containing...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002