Applying the BS Approach for Vector Quarkonia Decays Into Pair of Leptons Via Virtual Photon

2021 ◽  
Author(s):  
Hluf Negash
Keyword(s):  
Virtual Photon

Heavy Flavour Effects in the Virtual Photon Structure Functions to NLO in QCD

2009 ◽  
Author(s):  
Tsuneo Uematsu ◽  
Yoshio Kitadono ◽  
Ken Sasaki ◽  
Takahiro Ueda
Keyword(s):  
Virtual Photon ◽  
Structure Functions ◽  
Photon Structure

scholarly journals Saturation effects in SIDIS at very forward rapidities

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
E. Iancu ◽  
A. H. Mueller ◽  
D. N. Triantafyllopoulos ◽  
S. Y. Wei
Keyword(s):  
Inelastic Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Virtual Photon ◽  
Large Fraction ◽  
Quark Distribution ◽  
High Energy ◽  
Longitudinal Momentum ◽  
Black Disk ◽  
Gluon Saturation

Abstract Using the dipole picture for electron-nucleus deep inelastic scattering at small Bjorken x, we study the effects of gluon saturation in the nuclear target on the cross-section for SIDIS (single inclusive hadron, or jet, production). We argue that the sensitivity of this process to gluon saturation can be enhanced by tagging on a hadron (or jet) which carries a large fraction z ≃ 1 of the longitudinal momentum of the virtual photon. This opens the possibility to study gluon saturation in relatively hard processes, where the virtuality Q2 is (much) larger than the target saturation momentum $$ {Q}_s^2 $$ Q s 2 , but such that z(1 − z)Q2 ≲ $$ {Q}_s^2 $$ Q s 2 . Working in the limit z(1 − z)Q2 ≪ $$ {Q}_s^2 $$ Q s 2 , we predict new phenomena which would signal saturation in the SIDIS cross-section. For sufficiently low transverse momenta k⊥ ≪ Qs of the produced particle, the dominant contribution comes from elastic scattering in the black disk limit, which exposes the unintegrated quark distribution in the virtual photon. For larger momenta k⊥ ≳ Qs, inelastic collisions take the leading role. They explore gluon saturation via multiple scattering, leading to a Gaussian distribution in k⊥ centred around Qs. When z(1 − z)Q2 ≪ Q2, this results in a Cronin peak in the nuclear modification factor (the RpA ratio) at moderate values of x. With decreasing x, this peak is washed out by the high-energy evolution and replaced by nuclear suppression (RpA< 1) up to large momenta k⊥ ≫ Qs. Still for z(1 − z)Q2 ≪ $$ {Q}_s^2 $$ Q s 2 , we also compute SIDIS cross-sections integrated over k⊥. We find that both elastic and inelastic scattering are controlled by the black disk limit, so they yield similar contributions, of zeroth order in the QCD coupling.

scholarly journals THE CONTINUUM AND INTERFERENCE EFFECT IN $e^+e^-\to D^0\bar{D}^0$, D+D- Processes

2008 ◽  
Vol 23 (36) ◽  
pp. 3113-3121 ◽  
Author(s):  
MAO-ZHI YANG
Keyword(s):  
Production Process ◽  
Interference Effect ◽  
Virtual Photon ◽  
Resonance Contribution ◽  
Text Production ◽  
Continuum Contribution ◽  
The Continuum

In the e+e- annihilation processes [Formula: see text], D+D- near or above the threshold of [Formula: see text], there are not only the resonance contribution [Formula: see text], D+D-, but also the continuum contribution through virtual photon directly [Formula: see text], D+D-. The amplitudes through virtual photon directly and through resonance can interfere seriously. We consider the continuum and interference effect in the [Formula: see text] production process in e+e- annihilation. We find that the effect is significant near and above the threshold of the [Formula: see text] mesons.

scholarly journals Virtual Photon-Photon Annihilation and the Pion Mass Difference

1971 ◽  
Vol 4 (11) ◽  
pp. 3523-3526 ◽  
Author(s):  
Tung-Mow Yan
Keyword(s):  
Virtual Photon ◽  
Pion Mass ◽  
Mass Difference ◽  
Photon Annihilation

scholarly journals Heavy Quark Effects in the Virtual Photon Structure Functions

2009 ◽  
Vol 121 (3) ◽  
pp. 495-510 ◽  
Author(s):  
Y. Kitadono ◽  
K. Sasaki ◽  
T. Ueda ◽  
T. Uematsu
Keyword(s):  
Heavy Quark ◽  
Virtual Photon ◽  
Structure Functions ◽  
Photon Structure

Virtual-photon tunnel effect and quantum noise in a one-atom micromaser

1996 ◽  
Vol 217 (4-5) ◽  
pp. 219-224 ◽  
Author(s):  
Zhengdong Liu ◽  
Liang Zeng ◽  
Ping Liu
Keyword(s):  
Virtual Photon ◽  
Quantum Noise ◽  
Tunnel Effect

Real and virtual photon interactions with nucleons and nuclei

2000 ◽  
Vol 663-664 ◽  
pp. 249c-256c
Author(s):  
A.W. Thomas
Keyword(s):  
Virtual Photon ◽  
Photon Interactions
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