Author:
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ISBN:
Category :
Languages : en
Pages : 11
Book Description
Measurement of the Gamma Gamma* to Pi0 Transition Form Factor
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Book Description
Measurement of the Gamma Gamma* -] Pi0 Transition Form Factor
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
Measurement of the Gamma Gamma* to Eta_c Transition Form Factor
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ISBN:
Category :
Languages : en
Pages : 20
Book Description
The authors study the reaction ee− 2!ee− [eta]{sub c}, [eta]{sub c} 2!K{sub S}K{sup ±}[pi]{sup {-+}} and obtain [eta]{sub c} mass and width values 2982.2 ± 0.4 ± 1.6 MeV/c2 and 31.7 ± 1.2 ± 0.8 MeV, respectively. They find [Lambda]([eta]{sub c} 2![gamma][gamma])[Beta]([eta]{sub c} 2!K{bar K}[pi]) = 0.374 ± 0.009 {+-} 0.031 keV, and measure the [gamma][gamma]* 2![eta]{sub c} transition form factor in the momentum transfer range from 2 to 50 GeV2. The analysis is based on 469 fb−1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
The authors study the reaction ee− 2!ee− [eta]{sub c}, [eta]{sub c} 2!K{sub S}K{sup ±}[pi]{sup {-+}} and obtain [eta]{sub c} mass and width values 2982.2 ± 0.4 ± 1.6 MeV/c2 and 31.7 ± 1.2 ± 0.8 MeV, respectively. They find [Lambda]([eta]{sub c} 2![gamma][gamma])[Beta]([eta]{sub c} 2!K{bar K}[pi]) = 0.374 ± 0.009 {+-} 0.031 keV, and measure the [gamma][gamma]* 2![eta]{sub c} transition form factor in the momentum transfer range from 2 to 50 GeV2. The analysis is based on 469 fb−1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV.
Measurement of the Gamma Gamma* --] Eta and Gamma Gamma* --] Eta' Transition Form Factors
Author:
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ISBN:
Category :
Languages : en
Pages : 20
Book Description
We study the reactions ee− 2!e+e− [eta]{sup (/)} in the single-tag mode and measure the [gamma][gamma]* 2![eta]{sup (/)} transition form factors in the momentum transfer range from 4 to 40 GeV2. The analysis is based on 469 fb−1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
We study the reactions ee− 2!e+e− [eta]{sup (/)} in the single-tag mode and measure the [gamma][gamma]* 2![eta]{sup (/)} transition form factors in the momentum transfer range from 4 to 40 GeV2. The analysis is based on 469 fb−1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV.
Transition Form Factor Gamma Gamma* -] Pi(sup)0 and QCD Sum Rules
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Category :
Languages : en
Pages : 625
Book Description
We extend the QCD sum rule analysis of the form factor F(sub)(gamma*gamma* -> pi^0)(q(sub)1^2, q(sub)2^2) into the region of small virtuality of one of the photons.
Publisher:
ISBN:
Category :
Languages : en
Pages : 625
Book Description
We extend the QCD sum rule analysis of the form factor F(sub)(gamma*gamma* -> pi^0)(q(sub)1^2, q(sub)2^2) into the region of small virtuality of one of the photons.
Chiral Anomaly Effects And the BaBar Measurements of the $\gamma\gamma{̂*}\to \pi{̂0}$ Transition Form Factor
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ISBN:
Category :
Languages : en
Pages : 7
Book Description
Publisher:
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Category :
Languages : en
Pages : 7
Book Description
On the Physical Relevance of the Study of Gamma* Gamma -] Pi Pi at Small T and Large Q2
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Category :
Languages : en
Pages : 7
Book Description
We discuss the relevance of a dedicated measurement of exclusive production of a pair of neutral pions in a hard [gamma]*[gamma] scattering at small momentum transfer. In this case, the virtuality of one photon provides us with a hard scale in the process, enabling us to perform a QCD calculation of this reaction rate using the concept of Transition Distribution Amplitudes (TDA). Those are related by sum rules to the pion axial form factor F{sub A}{sup [pi]} and, as a direct consequence, a cross-section measurement of this process at intense beam electron-positron colliders such as CLEO, KEK-B and PEP-II, or Super-B would provide us with a unique measurement of the neutral pion axial form factor F{sub A}{sup [pi]0} at small scale. We believe that our models for the photon to meson transition distribution amplitudes are sufficiently constrained to give reasonable orders of magnitude for the estimated cross sections. Cross sections are large enough for quantitative studies to be performed at high luminosity ee− colliders. After verifying the scaling and the [phi] independence of the cross section, one should be able to measure these new hadronic matrix elements, and thus open a new gate to the understanding of the hadronic structure. In particular, we argued here that the study of [gamma]*[gamma] 2![pi]°{pi}° in the TDA regime could provide with a unique experimental measurement of the {pi}° axial form factor.
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
We discuss the relevance of a dedicated measurement of exclusive production of a pair of neutral pions in a hard [gamma]*[gamma] scattering at small momentum transfer. In this case, the virtuality of one photon provides us with a hard scale in the process, enabling us to perform a QCD calculation of this reaction rate using the concept of Transition Distribution Amplitudes (TDA). Those are related by sum rules to the pion axial form factor F{sub A}{sup [pi]} and, as a direct consequence, a cross-section measurement of this process at intense beam electron-positron colliders such as CLEO, KEK-B and PEP-II, or Super-B would provide us with a unique measurement of the neutral pion axial form factor F{sub A}{sup [pi]0} at small scale. We believe that our models for the photon to meson transition distribution amplitudes are sufficiently constrained to give reasonable orders of magnitude for the estimated cross sections. Cross sections are large enough for quantitative studies to be performed at high luminosity ee− colliders. After verifying the scaling and the [phi] independence of the cross section, one should be able to measure these new hadronic matrix elements, and thus open a new gate to the understanding of the hadronic structure. In particular, we argued here that the study of [gamma]*[gamma] 2![pi]°{pi}° in the TDA regime could provide with a unique experimental measurement of the {pi}° axial form factor.
Form-factor of the Process Gamma* Gamma* ---] Pi0 for Small Virtuality of One of the Photons and QCD Sum Rules
Author:
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ISBN:
Category :
Languages : en
Pages :
Book Description
We extend the QCD sum rule analysis of the F{sub [gamma]*{gamma}* → [pi]{sup o}} (q12, q22) form factor into the region where one of the photons has small virtuality:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We extend the QCD sum rule analysis of the F{sub [gamma]*{gamma}* → [pi]{sup o}} (q12, q22) form factor into the region where one of the photons has small virtuality:
Scientific and Technical Aerospace Reports
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ISBN:
Category : Aeronautics
Languages : en
Pages : 702
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
Book Description
High Energy Physics Index
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ISBN:
Category : Nuclear physics
Languages : en
Pages : 716
Book Description
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 716
Book Description