scholarly journals Zγγproduction with leptonic decays and triple photon production at next-to-leading order QCD

2011 ◽  
Vol 84 (7) ◽  
Author(s):  
G. Bozzi ◽  
F. Campanario ◽  
M. Rauch ◽  
D. Zeppenfeld
Keyword(s):  
Photon Production ◽  
Leading Order ◽  
Leptonic Decays

scholarly journals AssociatedZ0H0production with leptonic decays at the LHC in next-to-leading order QCD

2012 ◽  
Vol 86 (3) ◽  
Author(s):  
Zhang Shi-Ming ◽  
Zhang Ren-You ◽  
Ma Wen-Gan ◽  
Guo Lei
Keyword(s):  
Leading Order ◽  
Leptonic Decays

Erratum: Direct photon production by polarized beam and target: Complete next-to-leading order corrections

1996 ◽  
Vol 54 (11) ◽  
pp. 7081-7081 ◽  
Author(s):  
A. P. Contogouris ◽  
B. Kamal ◽  
Z. Merebashvili ◽  
F. V. Tkachov
Keyword(s):  
Photon Production ◽  
Direct Photon ◽  
Leading Order ◽  
Polarized Beam ◽  
Direct Photon Production

Direct photon production by polarized beam and target: Complete next-to-leading-order corrections

1993 ◽  
Vol 48 (9) ◽  
pp. 4092-4102 ◽  
Author(s):  
A. P. Contogouris ◽  
B. Kamal ◽  
Z. Merebashvili ◽  
F. V. Tkachov
Keyword(s):  
Photon Production ◽  
Direct Photon ◽  
Leading Order ◽  
Polarized Beam ◽  
Direct Photon Production

scholarly journals ELECTROMAGNETIC RADIATION FROM BROKEN SYMMETRIES IN RELATIVISTIC NUCLEAR COLLISIONS

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2350-2355 ◽  
Author(s):  
GUANG-YOU QIN ◽  
CHARLES GALE ◽  
ABHIJIT MAJUMDER
Keyword(s):  
Charge Asymmetry ◽  
Gluon Plasma ◽  
Baryon Density ◽  
Photon Production ◽  
Leading Order ◽  
Broken Symmetries ◽  
Nuclear Collisions ◽  
Direct Photon Production ◽  
Relativistic Nuclear Collisions ◽  
A Charge

A new channel of direct photon production from a quark gluon plasma (QGP) is explored in the framework of high-temperature QCD. This process appears at next-to-leading order, in the presence of a charge asymmetry in the excited matter. The photon production rate from this new mechanism is suppressed compared to the QCD annihilation and Compton scattering at low baryon density but assumes importance in baryon-rich matter.

scholarly journals Wγγproduction with leptonic decays at next-to-leading order QCD

2011 ◽  
Vol 83 (11) ◽  
Author(s):  
G. Bozzi ◽  
F. Campanario ◽  
M. Rauch ◽  
D. Zeppenfeld
Keyword(s):  
Leading Order ◽  
Leptonic Decays

TWO PHOTON DECAYS OF PION IN BETHE–SALPETER FRAMEWORK WITH GENERALIZED STRUCTURE OF HADRON-QUARK VERTEX

2008 ◽  
Vol 17 (03) ◽  
pp. 519-530
Author(s):  
SHASHANK BHATNAGAR
Keyword(s):  
Power Counting ◽  
Meson Mass ◽  
Leading Order ◽  
Coupling Constant ◽  
Counting Rule ◽  
Leptonic Decays ◽  
Two Photon ◽  
Pseudoscalar Mesons ◽  
Complete Set ◽  
Photon Coupling

Two photon decays of pion are studied in the framework of the Bethe–Salpeter equation under Covariant Instantaneous Ansatz where the structure of hadron-quark vertex function Γ is generalized to include various Dirac covariants (other than γ5) from their complete set. These covariants are incorporated in accordance with a power counting rule (which was recently employed to calculate leptonic decays constants of pseudoscalar mesons and vector mesons) order by order in powers of the inverse of the meson mass. Pion-photon coupling constant Fπ is calculated with the incorporation of leading order covariants.

scholarly journals NEXT-TO-NEXT-TO-LEADING-ORDER SOFT-GLUON CORRECTIONS IN DIRECT PHOTON PRODUCTION

2004 ◽  
Vol 19 (01) ◽  
pp. 149-158 ◽  
Author(s):  
NIKOLAOS KIDONAKIS ◽  
J. F. OWENS
Keyword(s):  
Scale Dependence ◽  
Photon Production ◽  
Direct Photon ◽  
Experimental Results ◽  
Soft Gluon ◽  
Leading Order ◽  
Convergence Properties ◽  
Good Convergence ◽  
Order Calculation ◽  
Direct Photon Production

Previous work on soft-gluon resummation for direct photon production is extended to include additional subleading logarithmic terms through [Formula: see text] and some representative comparisons are made to experimental results from the E-706 and UA-6 Collaborations. The additional terms are small in magnitude, indicating good convergence properties to the level of accuracy calculated. The scale dependence remains much smaller than that of the next-to-leading-order calculation.

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