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

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 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 DECAY CONSTANTS OF PSEUDOSCALAR MESONS IN BETHE–SALPETER FRAMEWORK WITH GENERALIZED STRUCTURE OF HADRON-QUARK VERTEX

2009 ◽  
Vol 18 (07) ◽  
pp. 1521-1533 ◽  
Author(s):  
SHASHANK BHATNAGAR ◽  
SHI-YUAN LI
Keyword(s):  
Power Counting ◽  
Meson Mass ◽  
Dirac Structure ◽  
Leading Order ◽  
Counting Rule ◽  
Decay Constants ◽  
Leptonic Decays ◽  
Pseudoscalar Mesons ◽  
Complete Set ◽  
Rule Order

We employ the framework of Bethe–Salpeter equation under Covariant Instantaneous Ansatz to study the leptonic decays of pseudoscalar mesons. The Dirac structure of hadron-quark vertex function Γ is generalized to include various Dirac covariants besides γ5 from their complete set. The covariants are incorporated in accordance with a power counting rule, order-by-order in powers of the inverse of the meson mass. The decay constants are calculated with the incorporation of leading order covariants. Most of the results are dramatically improved.

scholarly journals Radiative decays of heavy-light mesons and the $$ {f}_{H,{H}^{\ast },{H}_1}^{(T)} $$ decay constants

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Ben Pullin ◽  
Roman Zwicky
Keyword(s):  
Sum Rules ◽  
Form Factors ◽  
Radiative Decays ◽  
Matrix Elements ◽  
Leading Order ◽  
Sum Rule ◽  
Decay Constants ◽  
Leptonic Decays ◽  
Shell Matrix ◽  
First Time

Abstract The on-shell matrix elements, or couplings $$ {g}_{H{H}^{\ast}\left({H}_1\right)\upgamma} $$ g H H ∗ H 1 γ , describing the $$ B{(D)}_q^{\ast } $$ B D q ∗ → B(D)qγ and B1q → Bqγ (q = u, d, s) radiative decays, are determined from light-cone sum rules at next-to-leading order for the first time. Two different interpolating operators are used for the vector meson, providing additional robustness to our results. For the D*-meson, where some rates are experimentally known, agreement is found. The couplings are of additional interest as they govern the lowest pole residue in the B(D) → γ form factors which in turn are connected to QED-corrections in leptonic decays B(D) → ℓ$$ \overline{\nu} $$ ν ¯ . Since the couplings and residues are related by the decay constants $$ {f}_{H^{\ast}\left({H}_1\right)} $$ f H ∗ H 1 and $$ {f}_{H^{\ast}\left({H}_1\right)}^T $$ f H ∗ H 1 T , we determine them at next-leading order as a by-product. The quantities $$ \left\{{f}_{H^{\ast}}^T,{f}_{H_1}^T\right\} $$ f H ∗ T f H 1 T have not previously been subjected to a QCD sum rule determination. All results are compared with the existing experimental and theoretical literature.

scholarly journals Next-to-leading order QCD corrections toW+W−γandZZγproduction with leptonic decays

2010 ◽  
Vol 81 (9) ◽  
Author(s):  
G. Bozzi ◽  
F. Campanario ◽  
V. Hankele ◽  
D. Zeppenfeld
Keyword(s):  
Leading Order ◽  
Leptonic Decays
Sign in / Sign up

Export Citation Format

Share Document