منابع مشابه
Scalar mesons and Adler zeros
A simple unitarized quark-meson model, recently applied with success to light and charmed scalar mesons, is shown to encompass Adler-type zeros in the amplitude, due to the use of relativistic kinematics in the scattering sector. These zeros turn out to be crucial for the description of the K∗ 0 (800) resonance, as well as the new charmed scalar mesons D∗ s0(2317) and D ∗ 0(2300). The light sca...
متن کاملThe inverse amplitude method in Chiral Perturbation Theory
Based on a dispersive approach, we apply the inverse amplitude method to unitarize one-loop SU(2) and SU(3) Chiral Perturbation Theory. Numerically, we find that this unitarization technique yields the correct complex analytic structure in terms of cuts and poles. Indeed, using the chiral parameter estimates obtained from low energy experiments we obtain the poles associated with the ρ(770) and...
متن کاملZeroing in on Supersymmetric Radiation Amplitude Zeros
Radiation amplitude zeros have long been used to test the Standard Model. Here, we consider the supersymmetric radiation amplitude zero in chargino-neutralino associated production, which can be observed at the luminosity upgraded LHC. Such an amplitude zero only occurs if the neutralino has a large wino fraction and hence this observable can be used to determine the neutralino eigenstate conte...
متن کاملAmplitude zeros in W+/-Z production.
We demonstrate that the Standard Model amplitude for f1f̄2 → WZ at the Born-level exhibits an approximate zero located at cos θ = (g1 − + g f2 − )/(g f1 − − g2 − ) at high energies, where the g fi − (i = 1, 2) are the left-handed couplings of the Z-boson to fermions and θ is the center of mass scattering angle of the W -boson. The approximate zero is the combined result of an exact zero in the d...
متن کاملExact and Approximate Radiation Amplitude Zeros — Phenomenological Aspects
We review the phenomenological aspects of the exact and approximate Radiation Amplitude Zeros (RAZ) and discuss the prospects of searches for these zeros at current and future collider experiments. I. EXACT AND APPROXIMATE RADIATION AMPLITUDE ZEROS More than 15 years ago, the pioneer studies on vector-boson pair production [1–3] revealed a surprise: the angular distribution for f1f̄2 → Wγ develo...
متن کاملذخیره 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: 2008
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.77.056006