Results 161 to 170 of about 1,229,152 (269)

Collider sensitivity to SMEFT heavy-quark operators at one-loop in top-quark processes [PDF]

open access: yesarXiv
We study the effects of four-heavy-quark operators in the production of top quarks in the framework of the Standard Model Effective Field Theory (SMEFT) at the LHC. In particular, we compute for the first time the total contribution of the four-top-quark operator which enters only at the one-loop level in the top-quark pair production process ...
arxiv  

Finite modular subgroups for fermion mass matrices and baryon/lepton number violation

open access: yesPhysics Letters B, 2019
We study a flavor model that the quark sector has the S3 modular symmetry while the lepton sector has the A4 modular symmetry. Our model leads to characteristic quark mass matrices which are consistent with experimental data of quark masses, mixing ...
Tatsuo Kobayashi   +5 more
doaj  

An introduction to the quark model

open access: yes, 2012
This document contains a review on the quark model, prepared for lectures at the Niccolo Cabeo School at Ferrara in May 2012. It includes some historical aspects, the spectral properties of the 2-body and 3-body Schroedinger operators applied to mesons and baryons, the link between meson and baryon spectra, the role of flavour independence, and the ...
openaire   +3 more sources

Bridging the chiral symmetry and confinement with singularity

open access: yesPhysics Letters B, 2020
We consider a holographic quark model where the confinement is a consequence of the quark condensate. Surprisingly, the equation of motion of our holographic model can be mapped to the old spin-less bag model.
Yoon-Seok Choun, Sang-Jin Sin
doaj  

Does nuclear medium affect the transverse momentum-dependent parton distributions of valence quark of pions?

open access: yesPhysics Letters B
We calculate the valence quark transverse momentum-dependent parton distributions (TMDs) of the lightest pseudoscalar meson, pions, in isospin asymmetric nuclear matter at zero temperature by employing a light-cone quark model.
Navpreet Kaur   +5 more
doaj  

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