Exclusive processes e{sup +}e{sup }{yields}VP in k{sub T} factorization
Abstract
The exclusive processes e{sup +}e{sup }{yields}VP, in the region of which the final state meson momentum is much larger than the hadronic scale {lambda}{sub QCD}, are studied in the framework of the perturbative quantum chromodynamics (PQCD) approach based on the k{sub T} factorization. Including the transverse momentum distribution in the lightcone wave functions, our results are consistent with the experimental measurements. According to our results, many processes have large enough cross sections to be detected at {radical}(s)=10.58 GeV. The s dependence of the cross section has been directly studied and our result indicates that the 1/s{sup 3} scaling is more favored than 1/s{sup 4}. We also find that the gluonic contribution for the processes involving {eta}{sup (')} is tiny.
 Authors:
 CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)
 (4), 100049 (China)
 Institute of High Energy Physics, CAS, P.O. Box 918(4), 100049 (China)
 Publication Date:
 OSTI Identifier:
 21020492
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.094020; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; DISTRIBUTION; ELECTRONPOSITRON INTERACTIONS; ELECTRONS; ETA PRIME958 MESONS; EXCLUSIVE INTERACTIONS; FACTORIZATION; GEV RANGE; LIGHT CONE; PERTURBATION THEORY; POSITRONS; QUANTUM CHROMODYNAMICS; TRANSVERSE MOMENTUM; VECTOR MESONS; WAVE FUNCTIONS
Citation Formats
Lue Caidian, Institute of High Energy Physics, CAS, P.O. Box 918, Wang Wei, and Wang Yuming. Exclusive processes e{sup +}e{sup }{yields}VP in k{sub T} factorization. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVD.75.094020.
Lue Caidian, Institute of High Energy Physics, CAS, P.O. Box 918, Wang Wei, & Wang Yuming. Exclusive processes e{sup +}e{sup }{yields}VP in k{sub T} factorization. United States. doi:10.1103/PHYSREVD.75.094020.
Lue Caidian, Institute of High Energy Physics, CAS, P.O. Box 918, Wang Wei, and Wang Yuming. Tue .
"Exclusive processes e{sup +}e{sup }{yields}VP in k{sub T} factorization". United States.
doi:10.1103/PHYSREVD.75.094020.
@article{osti_21020492,
title = {Exclusive processes e{sup +}e{sup }{yields}VP in k{sub T} factorization},
author = {Lue Caidian and Institute of High Energy Physics, CAS, P.O. Box 918 and Wang Wei and Wang Yuming},
abstractNote = {The exclusive processes e{sup +}e{sup }{yields}VP, in the region of which the final state meson momentum is much larger than the hadronic scale {lambda}{sub QCD}, are studied in the framework of the perturbative quantum chromodynamics (PQCD) approach based on the k{sub T} factorization. Including the transverse momentum distribution in the lightcone wave functions, our results are consistent with the experimental measurements. According to our results, many processes have large enough cross sections to be detected at {radical}(s)=10.58 GeV. The s dependence of the cross section has been directly studied and our result indicates that the 1/s{sup 3} scaling is more favored than 1/s{sup 4}. We also find that the gluonic contribution for the processes involving {eta}{sup (')} is tiny.},
doi = {10.1103/PHYSREVD.75.094020},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

This paper is devoted to consideration of the hard exclusive processes e{sup +}e{sup }{yields}VP, where V={rho}, {phi}; P={eta}, {eta}{sup '}. Experimental measurement of the cross section of the process e{sup +}e{sup }{yields}{phi}{eta} at the BABAR Collaboration at large center of mass energy {radical}(s)=10.6 GeV and some low energy experimental data {radical}(s){approx}24 GeV give us the possibility to study the cross section in the broad energy region. As a result, we have determined the asymptotic behavior of the cross section of e{sup +}e{sup }{yields}{phi}{eta} in the limit s{yields}{infinity}, which is in agreement with perturbative QCD prediction. Assuming that the same asymptoticmore »

Study of the Decays D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e}, D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e}, D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e}, and D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e}
By using 1.8x10{sup 6} DD pairs, we have measured B(D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e})=0.299(11)(9)%, B(D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e})=0.373(22)(13)%, B(D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e})=3.56(3)(9)%, and B(D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e})=8.53(13)(23)% and have studied the q{sup 2} dependence of the form factors. By combining our results with recent lattice calculations, we obtain V{sub cd}=0.217(9)(4)(23) and V{sub cs}=1.015(10)(11)(106) 
Study of the semileptonic charm decays D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e}, D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e}, D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e}, and D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e}
Using a sample of 1.8 million DD mesons collected at the {psi}(3770) with the CLEOc detector, we study the semileptonic decays D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e}, D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e}, D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e}, and D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e}. For the total branching fractions we find B(D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e})=0.299(11)(9)%, B(D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e})=0.373(22)(13)%, B(D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e})=3.56(3)(9)%, and B(D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e})=8.53(13)(23)%, where the first error is statistical and the second systematic. In addition, form factors are studied through fits to the partial branching fractions obtained in five q{sup 2} ranges. Bymore » 
Study of D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e}, D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e}, D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e}, and D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e} in tagged decays of the {psi}(3770) resonance
Using {psi}(3770){yields}DD events collected with the CLEOc detector at the Cornell e{sup +}e{sup } storage ring, tagged by fully reconstructing one D meson in a hadronic decay mode, we measure absolute branching fractions and differential decay rates for D{sup 0}{yields}{pi}{sup }e{sup +}{nu}{sub e}, D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e}, D{sup 0}{yields}K{sup }e{sup +}{nu}{sub e}, and D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e}. The measured decay rates are used to study semileptonic form factors governing these transitions and to test unquenched Lattice QCD (LQCD) calculations. We average our results with previously published CLEOc measurements of the same quantities using a neutrino reconstruction technique. Combiningmore » 
Nexttoleadingorder corrections to exclusive processes in k{sub T} factorization
We calculate nexttoleadingorder corrections to exclusive processes in the k{sub T} factorization theorem, taking {pi}{gamma}*{yields}{gamma} as an example. Partons off shell by k{sub T}{sup 2} are considered in both the quark diagrams from full QCD and the effective diagrams for the pion wave function. The gauge dependences in the above two sets of diagrams cancel, when deriving the k{sub T}dependent hard kernel as their difference. The gauge invariance of the hard kernel is then proven to all orders by induction. The lightcone singularities in the k{sub T}dependent pion wave function are regularized by rotating the Wilson lines away from themore »