Pion electroproduction amplitude relations in the1/Ncexpansion

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود 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

0 Two pion electroproduction ∗

We have extended a model for the γN → ππN reaction to virtual photons and selected the diagrams which have a ∆ in the final state. The agreement found with the γ v p → ∆ 0 π + and γ v p → ∆ ++ π − reactions is good. The sensitivity of the results to N ∆ transition form factors is also studied. The present reaction, selecting a particular final state, is an extra test for models of the γ v N → π...

متن کامل

Electroproduction of pion pairs

We study hard exclusive electroproduction of two pions in the QCD factorization approach at next-to-leading order (NLO) in the strong coupling. The pion pair can be produced both in an isovector and in an isoscalar state. The angular distribution of the produced pion pairs allows one to project out a component that depends on the interference of the isovector and isoscalar channels. Using speci...

متن کامل

Pion Electroproduction Using Clas

Measurements of the p(e;e p)πo reaction in the ∆(1232) resonance region have been performed with the CLAS detector at Jefferson Lab using beam energies of 1.645 and 2.445 GeV. Cross sections were measured over a range of four-momentum transfer Q2= 0.4-1.8 (GeV/c)2. Decay angular distributions in the πo p center-of-mass were obtained with full coverage in cosθ π and φ π. This permits the extract...

متن کامل

Pion charge radius from charged pion electroproduction

We analyze a low-energy theorem of threshold pion electroproduction which allows one to determine the charge radius of the pion. We show that at the same order where the radius appears, pion loops induce a correction to the momentum dependence of the longitudinal dipole amplitude L01 (2) . This model-independent correction amounts to an increase of the pion charge radius squared from the electr...

متن کامل

Pion Photoproduction Amplitude Relations in the 1 / N c Expansion

Abstract We derive expressions for pion photoproduction amplitudes in the 1/Nc expansion of QCD, and obtain linear relations directly from this expansion that relate electromagnetic multipole amplitudes at all energies. The leading-order relations in 1/Nc compare favorably with available data, while the next-to-leading order relations seem to provide only a small improvement. However, when reso...

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: Physical Review D

سال: 2009

ISSN: 1550-7998,1550-2368

DOI: 10.1103/physrevd.80.076006