Transition distribution amplitudes and hard exclusive reactions with baryon number transfer
نویسندگان
چکیده
Baryon-to-meson and baryon-to-photon transition distribution amplitudes (TDAs) arise in the collinear factorized description of a class hard exclusive reactions characterized by exchange non-zero baryon number cross channel. These TDAs extend concepts generalized parton distributions (GPDs) (DAs). In this review we discuss general properties physical interpretation baryon-to-meson TDAs. We argue that these non-perturbative objects are convenient complementary tool to explore structure baryons at partonic level. present an overview admitting terms first signals from backward meson electroproduction JLab with 6 GeV electron beam further experimental opportunities access [email protected] GeV, P?ANDA, J-PARC EIC.
منابع مشابه
Baryon to meson transition distribution amplitudes and their spectral representation
We consider the problem of construction of a spectral representation for nucleon to meson transition distribution amplitudes (TDAs), non-diagonal matrix elements of nonlocal three quark operators between a nucleon and a meson states. We introduce the notion of quadruple distributions and generalize Radyshkin’s factorized Ansatz for this issue. Modelling of baryon to meson TDAs in the complete d...
متن کاملExclusive hard reactions and QCD
Exclusive reactions at large momentum transfer allow to probe the structure of hadrons, in particular of the pion and nucleon, on the amplitude level. They are challenging both the experimental measurements and the theoretical understanding of Quantum Chromodynamics. We shortly introduce the concept of factorization, emphasize the importance of new experimental nucleon and photon-to-pion form f...
متن کاملAnalytic Properties of Hard Exclusive Amplitudes
Analytic properties of hard exclusive processes described by Generalized Parton Distributions (GPD’s) are considered. The analytic continuation of GPD is provided by Generalized Distribution Amplitudes (GDA). The GDA’s for the production of two ρ−mesons may give an access to four-quark exotic states. The crucial role in the proof of analyticity is played by the Cavalieri conditions (polynomiali...
متن کاملHard Quark-quark Scattering with Exclusive Reactions
We present data from ir~p •*• elastic and p~p final states for scattering at 90° center of mass, -t = 9 GeV/c. A large p~p signal is seen and the p" are strongly polarized. This polarization tests a QCD prediction that quarks cannot flip helicity. The test fails dramatically. Exclusive two-body to two-body scattering at large momentum transfer represents a new laboratory for the study of hard s...
متن کاملBaryon Number Transfer Could Delay Quark–Hadron Transition in Cosmology
In the early Universe, strongly interacting matter was a quark–gluon plasma. Both lattice computations and heavy ion collision experiments, however, tell us that, in the absence of chemical potentials, no plasma survives at T <∼150 MeV. The cosmological Quark–Hadron transition, however, seems to have been a crossover; cosmological consequences envisaged when it was believed to be a phase transi...
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: Physics Reports
سال: 2021
ISSN: ['0370-1573', '1873-6270']
DOI: https://doi.org/10.1016/j.physrep.2021.09.002