Note on helicity amplitudes in D{yields}V semileptonic decays
Abstract
Motivated by the recent extraction of the helicity amplitudes for the D{sup +}{yields}K*{sup 0}{mu}{nu}{sub {mu}} decay, done by the FOCUS collaboration, we determine helicity amplitudes for the D{sup +}{yields}K*{sup 0}l{nu}{sub l}, D{sup +}{yields}{rho}{sup 0}l{nu}{sub l} and D{sub s}{sup +}{yields}{phi}l{nu}{sub l} semileptonic decays using the knowledge of the relevant form factors. The vector and axial form factors for D{yields}Vl{nu}{sub l} decays are parametrized by including contributions of charm meson resonances and using the HQET and SCET limits. In the case that the vector form factor receives contributions from two poles while axial form factors are dominated by a single pole for D{sup +}{yields}K*{sup 0}l{nu}{sub l}, we obtain better agreement with the experimental result then when all of them are dominated by single poles.
 Authors:
 J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana (Slovenia)
 (Slovenia)
 Publication Date:
 OSTI Identifier:
 20776915
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.73.057503; (c) 2006 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; AMPLITUDES; D PLUS MESONS; D S MESONS; FORM FACTORS; HELICITY; K*892 MESONS; NEUTRINOS; PHI1020 MESONS; PHI1680 MESONS; RESONANCE PARTICLES; RHO770 MESONS; SEMILEPTONIC DECAY; VECTORS
Citation Formats
Fajfer, Svjetlana, Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, and Kamenik, Jernej. Note on helicity amplitudes in D{yields}V semileptonic decays. United States: N. p., 2006.
Web. doi:10.1103/PhysRevD.73.057503.
Fajfer, Svjetlana, Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, & Kamenik, Jernej. Note on helicity amplitudes in D{yields}V semileptonic decays. United States. doi:10.1103/PhysRevD.73.057503.
Fajfer, Svjetlana, Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, and Kamenik, Jernej. Wed .
"Note on helicity amplitudes in D{yields}V semileptonic decays". United States.
doi:10.1103/PhysRevD.73.057503.
@article{osti_20776915,
title = {Note on helicity amplitudes in D{yields}V semileptonic decays},
author = {Fajfer, Svjetlana and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana and Kamenik, Jernej},
abstractNote = {Motivated by the recent extraction of the helicity amplitudes for the D{sup +}{yields}K*{sup 0}{mu}{nu}{sub {mu}} decay, done by the FOCUS collaboration, we determine helicity amplitudes for the D{sup +}{yields}K*{sup 0}l{nu}{sub l}, D{sup +}{yields}{rho}{sup 0}l{nu}{sub l} and D{sub s}{sup +}{yields}{phi}l{nu}{sub l} semileptonic decays using the knowledge of the relevant form factors. The vector and axial form factors for D{yields}Vl{nu}{sub l} decays are parametrized by including contributions of charm meson resonances and using the HQET and SCET limits. In the case that the vector form factor receives contributions from two poles while axial form factors are dominated by a single pole for D{sup +}{yields}K*{sup 0}l{nu}{sub l}, we obtain better agreement with the experimental result then when all of them are dominated by single poles.},
doi = {10.1103/PhysRevD.73.057503},
journal = {Physical Review. D, Particles Fields},
number = 5,
volume = 73,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2006},
month = {Wed Mar 01 00:00:00 EST 2006}
}

Extracting CP violation and strong phase in D decays by using quantum correlations in {psi}(3770){yields}D{sup 0}D{sup 0{yields}}(V{sub 1}V{sub 2})(V{sub 3}V{sub 4}) and {psi}(3770){yields}D{sup 0}D{sup 0{yields}}(V{sub 1}V{sub 2})(K{pi})
The charm quark offers interesting opportunities to cross check the mechanism of CP violation precisely tested in the strange and beauty sectors. In this paper, we exploit the angular and quantum correlations in the DD pairs produced through the decay of the {psi}(3770) resonance in a charm factory to investigate CPviolation in two different ways. We build CPviolating observables in {psi}(3770){yields}DD{yields}(V{sub 1}V{sub 2})(V{sub 3}V{sub 4}) to isolate specific new physics effects in the charm sector. We also consider the case of {psi}(3770){yields}DD{yields}(V{sub 1}V{sub 2})(K{pi}) decays, which provide a new way to measure the strong phase difference {delta} between Cabibbo favoredmore » 
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 the leptonic decays of pseudoscalar B,D and vector B*,D* mesons and of the semileptonic B{yields}D and B{yields}D* decays
We present results for different observables in weak decays of pseudoscalar and vector mesons with a heavy c or b quark. The calculations are done in a nonrelativistic constituent quark model improved at some instances by heavy quark effective theory constraints. We determine pseudoscalar and vector meson decay constants that within a few percent satisfy f{sub V}M{sub V}/f{sub P}M{sub P}=1, a result expected in heavy quark symmetry when the heavy quark masses tend to infinity. We also analyze the semileptonic B{yields}D and B{yields}D* decays for which we evaluate the different form factors. Here we impose heavy quark effective theory constraintsmore »