High-Energy Photoproduction of Pseudoscalar Mesons in a Quark Model

1970 ◽  
Vol 2 (9) ◽  
pp. 1952-1955 ◽  
Author(s):  
Ramesh Chand ◽  
A. Sundaram
Keyword(s):  
Quark Model ◽  
High Energy ◽  
Pseudoscalar Mesons

High-energy meson-baryon scattering in a quark model

1974 ◽  
Vol 9 (7) ◽  
pp. 2056-2063 ◽  
Author(s):  
Ramesh Chand
Keyword(s):  
Quark Model ◽  
High Energy

scholarly journals The low-energy effective theory of axions and ALPs

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Martin Bauer ◽  
Matthias Neubert ◽  
Sophie Renner ◽  
Marvin Schnubel ◽  
Andrea Thamm
Keyword(s):  
High Energy ◽  
New Physics ◽  
Mass Scale ◽  
Low Energy ◽  
Effective Theory ◽  
Loop Order ◽  
Flavor Changing ◽  
Effective Lagrangian ◽  
Anomalous Dimensions ◽  
Pseudoscalar Mesons

Abstract Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Λ of the new-physics sector. Starting from the most general dimension-5 interactions, we discuss in detail the evolution of the ALP couplings from the new-physics scale to energies at and below the scale of electroweak symmetry breaking. We derive the relevant anomalous dimensions at two-loop order in gauge couplings and one-loop order in Yukawa interactions, carefully considering the treatment of a redundant operator involving an ALP coupling to the Higgs current. We account for one-loop (and partially two-loop) matching contributions at the weak scale, including in particular flavor-changing effects. The relations between different equivalent forms of the effective Lagrangian are discussed in detail. We also construct the effective chiral Lagrangian for an ALP interacting with photons and light pseudoscalar mesons, pointing out important differences with the corresponding Lagrangian for the QCD axion.

Quark Model and High Energy Collisions

10.1142/0111 ◽  
1985 ◽  
Author(s):  
V Anisovich ◽  
M Kobrinsky ◽  
J Nyiri ◽  
Yu Shabelski
Keyword(s):  
Quark Model ◽  
High Energy ◽  
High Energy Collisions

scholarly journals The production of charged-kaon pairs in proton–antiproton collisions: The role of higher-twist mechanism

2018 ◽  
Vol 33 (28) ◽  
pp. 1850166 ◽  
Author(s):  
M. Demirci ◽  
A. I. Ahmadov
Keyword(s):  
Transverse Momentum ◽  
Pair Production ◽  
Quark Model ◽  
Inclusive Cross Section ◽  
Gluon Fusion ◽  
High Energy ◽  
Light Front ◽  
Charged Kaon ◽  
Proton Antiproton ◽  
Direct Production

The higher-twist (HT) contribution to the charged-kaon pair production in the high energy proton–antiproton collisions at large transverse momentum [Formula: see text] is investigated by using the frozen coupling constant approach for various kaon distribution amplitudes (DAs), which are predicted by light-cone formalism, the light-front quark model, the nonlocal chiral quark model and the light-front holographic AdS/CFT approach. In the numerics, the dependencies of the HT contribution on the transverse momentum [Formula: see text], the rapidity [Formula: see text], and the variable [Formula: see text] are discussed with special emphasis put on DAs. The HT contribution is also compared with the leading-twist ones. It is shown that the HT contributions are dependent on the kaon DAs and also some other phenomenological parameters such as momentum cutoff parameter [Formula: see text]. Inclusive kaon pair production presents a remarkable test case in which HT terms dominate those of LT in certain kinematic regions. The HT direct production process via gluon–gluon fusion contributes significantly to the inclusive cross-section at large [Formula: see text].

Born term for high-energy meson-hadron collisions from QCD and chiral quark model

1988 ◽  
Vol 215 (4) ◽  
pp. 757-762 ◽  
Author(s):  
Wolfgang Ochs ◽  
Tokuzo Shimada
Keyword(s):  
Quark Model ◽  
Born Term ◽  
High Energy ◽  
Chiral Quark Model
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