Low Energy Theorems and Neutrino-Nucleon Sum Rules

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Low-energy Compton scattering on the nucleon and sum rules

The Gerasimov-Drell-Hearn and Baldin-Lapidus sum rules are evaluated in a relativistic, unitary, crossing symmetric and gauge-invariant model for photon-induced reactions on the nucleon. The property of analyticity is partially incorporated through a dressing procedure for propagators and vertices. The sum α + β of the electric and magnetic polarisabilities and the forward spin polarisability γ...

متن کامل

Neutrino Mixing Sum Rules and Oscillation Experiments

The neutrino mixing sum rule θ 12 − θ 13 cos(δ) ≈ θ ν 12 provides a possibility to explore the structure of the neutrino mass matrix in the presence of charged lepton corrections, since it relates the 1-2 mixing angle from the neutrino mass matrix, θ ν 12 , to observable parameters of the PMNS mixing matrix. The neutrino mixing sum rule holds if the charged lepton mixing angles are CKM-like, i....

متن کامل

-Nucleon Scattering Lengths from QCD Sum Rules

The QCD sum rule method is applied to derive a formula for the ρ, ω, φ meson-nucleon spin-isospin-averaged scattering lengths aρ,ω,φ. We found that the crucial matrix elements are 〈q̄γμDνq〉N (q = u, d) (twist-2 nucleon matrix element) for aρ,ω and ms〈s̄s〉N for aφ, and obtained aρ = 0.14 ± 0.07 fm, aω = 0.11 ± 0.06 fm and aφ = 0.035 ± 0.020 fm. These small numbers originate from a common factor 1/...

متن کامل

Comment on "Nucleon-nucleon scattering lengths in QCD sum rules"

In a recent Letter [1], Kondo and Morimatsu present a QCD sum rule calculation of nucleon-nucleon scattering lengths. They also relate the empirical scattering lengths to the nucleon mass shift δM in nuclear matter to cast doubt on the " linear density approximation. " In this Comment, we point out flaws in both parts of their analysis. It is useful to start with the (nonrelativistic) optical p...

متن کامل

New Sum Rules for Nucleon Tensor Charges ∗

Two new sum rules for the quark tensor charges of the nucleon are proposed, based on a relation connecting the quark transversity distributions to the quark helicity distributions and the quark model spin distributions, and on the sum rules for the quark helicity distributions. The two sum rules are useful for an estimate of the values of the quark tensor charges δU and δD from the measured qua...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Progress of Theoretical Physics

سال: 1972

ISSN: 0033-068X

DOI: 10.1143/ptp.47.246