X iv : h ep - p h / 03 11 27 5 v 1 2 1 N ov 2 00 3 Updated analysis of meson - nucleon sigma terms in the perturbative chiral quark model
نویسنده
چکیده
Updated analysis of meson-nucleon sigma terms in the perturbative chiral quark model Abstract We present an updated analysis of meson-baryon sigma terms in the per-turbative chiral quark model, which is based on effective chiral Lagrangian. The new feature concerns the inclusion of excited states in the quark prop-agator. Its influence on meson loops is shown to lead in particular for the pion-nucleon sigma term to an enhancement relevant for the current evaluation of this quantity. We also determine various flavor combinations of the scalar nucleon form factors and their respective low-momentum transfer limits.
منابع مشابه
ar X iv : h ep - p h / 04 11 20 4 v 1 1 6 N ov 2 00 4 OU - HET - 501 Chiral - Odd Twist - 3 Distribution Function e ( x )
We clarify the nonperturbative origin of the δ-function singularity at x = 0 in the chiral-odd twist-3 distribution function e(x) of the nucleon. We also compare a theoretical prediction for e(x) based on the chiral quark soliton model with the empirical information extracted from the CLAS semi-inclusive DIS measurement.
متن کامل2 00 4 Updated analysis of meson - nucleon sigma terms in the perturbative chiral quark model
We present an updated analysis of meson-baryon sigma terms in the per-turbative chiral quark model, which is based on effective chiral Lagrangian. The new feature concerns the inclusion of excited states in the quark prop-agator. Its influence on meson loops is shown to lead in particular for the pion-nucleon sigma term to an enhancement relevant for the current evaluation of this quantity. We ...
متن کاملar X iv : h ep - p h / 05 08 26 4 v 2 1 1 N ov 2 00 5 Scalar σ meson at finite temperature in nonlocal quark model
Properties and temperature behavior of π and σ bound states are studied in the framework of the nonlocal model with a separable interaction kernel based on the quark Dyson-Schwinger and the meson Bethe-Salpeter equations. Mπ(T ), fπ(T ), Mσ(T ) and Γσ→ππ(T ) are considered above and below the deconfinement and chiral restoration transitions.
متن کاملar X iv : h ep - p h / 98 11 38 7 v 1 1 8 N ov 1 99 8 Quark and Nuclear Matter in the Linear Chiral Meson Model ∗
The equation of state for quark and nuclear matter is encoded in the effective potential of a linear sigma model. We exploit an exact differential equation for its dependence upon the chemical potential µ associated to conserved baryon number. This equation describes the transitions from a nucleon gas to nuclear matter and from nuclear matter to quark matter within the same model. For vanishing...
متن کاملar X iv : h ep - p h / 02 08 24 2 v 2 1 3 N ov 2 00 2 Nucleon strangeness and spin crisis ?
We summarize three alternative extensions of the quark-valence picture of nucleon strangeness and spin, including (1) gluon spin in QCD, (2) Bjorken sum rule and QCD, (3) D–E meson mixing and tadpole leakage. All three approaches suggest that ∼ 40% of the nucleon’s spin (as well as its momentum) resides with quarks, but that less than 6% is due to strange quarks.
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 2003