Using data collected at the ψ(3770) resonance with the CLEO-c detector at the Cornell e+e− storage ring, we present searches for 25 charmless decay modes of the ψ(3770), mostly multibody final states. No evidence for charmless decays is found.Received 29 September 2005DOI:https://doi.org/10.1103/PhysRevLett.96.032003©2006 American Physical Society

10.1103/physrevlett.96.032003

Cite

Citations (27)

Measurement of lepton momentum moments in the decayB¯→Xlν¯

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (2003)

A. H. Mahmood S. E. Csorna I. Dankó G. Bonvicini D. Cinabro

We measure the primary lepton momentum spectrum in $\overline{B}\ensuremath{\rightarrow}X\mathcal{l}\overline{\ensuremath{\nu}}$ decays, for ${p}_{\mathcal{l}}>~1.5\mathrm{GeV}/c$ in the B rest frame. From this, we calculate various moments of the spectrum. In particular, we find ${R}_{0}\ensuremath{\equiv}{\ensuremath{\int}}_{1.7\mathrm{GeV}}(d\ensuremath{\Gamma}{/dE}_{\mathrm{sl}}{)dE}_{\mathcal{l}}/{\ensuremath{\int}}_{1.5\mathrm{GeV}}(d\ensuremath{\Gamma}{/dE}_{\mathrm{sl}}{)dE}_{\mathcal{l}}=0.6187\ifmmode\pm\else\textpm\fi{}{0.0014}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.0016}_{\mathrm{sys}}$ and ${R}_{1}\ensuremath{\equiv}{\ensuremath{\int}}_{1.5\mathrm{GeV}}{E}_{\mathcal{l}}(d\ensuremath{\Gamma}{/dE}_{\mathrm{sl}}{)dE}_{\mathcal{l}}/{\ensuremath{\int}}_{1.5\mathrm{GeV}}(d\ensuremath{\Gamma}{/dE}_{\mathrm{sl}}{)dE}_{\mathcal{l}}=(1.7810\ifmmode\pm\else\textpm\fi{}{0.0007}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.0009}_{\mathrm{sys}})\mathrm{GeV}.$ We use these moments to determine non-perturbative parameters governing the semileptonic width. In particular, we extract the heavy quark expansion parameters $\overline{\ensuremath{\Lambda}}=(0.39\ifmmode\pm\else\textpm\fi{}{0.03}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.06}_{\mathrm{sys}}\ifmmode\pm\else\textpm\fi{}{0.12}_{\mathrm{th}})\mathrm{GeV}$ and ${\ensuremath{\lambda}}_{1}=(\ensuremath{-}0.25\ifmmode\pm\else\textpm\fi{}{0.02}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.05}_{\mathrm{sys}}\ifmmode\pm\else\textpm\fi{}{0.14}_{\mathrm{th}}){\mathrm{GeV}}^{2}.$ The theoretical constraints used are evaluated through order ${1/M}_{B}^{3}$ in the non-perturbative expansion and ${\ensuremath{\beta}}_{0}{\ensuremath{\alpha}}_{s}^{2}$ in the perturbative expansion. We use these parameters to extract $|{V}_{\mathrm{cb}}|$ from the world average of the semileptonic width and find $|{V}_{\mathrm{cb}}|=(40.8\ifmmode\pm\else\textpm\fi{}{0.5}_{{\ensuremath{\Gamma}}_{\mathrm{sl}}}\ifmmode\pm\else\textpm\fi{}{0.4}_{({\ensuremath{\lambda}}_{1},\overline{\ensuremath{\Lambda}}{)}_{\mathrm{exp}}}\ifmmode\pm\else\textpm\fi{}{0.9}_{\mathrm{th}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}.$ In addition, we extract the short range b-quark mass ${m}_{b}^{1\mathrm{S}}=(4.82\ifmmode\pm\else\textpm\fi{}{0.07}_{\mathrm{exp}}\ifmmode\pm\else\textpm\fi{}{0.11}_{\mathrm{th}})\mathrm{GeV}{/c}^{2}.$ Finally, we discuss the implications of our measurements for the theoretical understanding of inclusive semileptonic processes.

10.1103/physrevd.67.072001

Cite

Citations (18)

Search forB→μν¯μγandB→e

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (1997)

T. E. Browder F. Li Y. Li J. L. Rodriguez T. Bergfeld

We have searched for the decays $B\ensuremath{\rightarrow}\ensuremath{\mu}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\gamma}$ and $B\ensuremath{\rightarrow}e{\overline{\ensuremath{\nu}}}_{e}\ensuremath{\gamma}$ in a sample of $2.7\ifmmode\times\else\texttimes\fi{}{10}^{6}$ charged $B$ decays collected with the CLEO II detector. In the muon channel, we observe no candidates in the signal region and set an upper limit on the branching fraction of $\mathcal{B}(B\ensuremath{\rightarrow}\ensuremath{\mu}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\gamma})<5.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at the 90% confidence level. In the electron channel, we observe five candidates in the signal region and set an upper limit on the branching fraction of $\mathcal{B}(B\ensuremath{\rightarrow}e{\overline{\ensuremath{\nu}}}_{e}\ensuremath{\gamma})<2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at the 90% confidence level.

Branching fraction

10.1103/physrevd.56.11

Cite

Citations (9)

Bounds on theCPAsymmetry inb→sγDecays

Physical Review Letters (2001)

T. E. Coan V. Fadeyev Y. Maravin I. Narsky R. Stroynowski

We have measured the CP asymmetry A(CP) identical with[gamma(b-->sgamma)-gammab-->sgamma)]/[gamma(b-->sgamma)+gamma(b-->sgamma)] to be A(CP) = (-0.079+/-0.108+/-0.022) (1.0+/-0.030), implying that, at 90% confidence level, A(CP) lies between -0.27 and +0.10. These limits rule out some extreme non-standard-model predictions, but are consistent with most, as well as with the standard model.

10.1103/physrevlett.86.5661

Cite

Citations (51)

Study of the Semileptonic Charm DecaysD0→π−ℓ+νandD0→

Physical Review Letters (2005)

G. S. Huang D. H. Miller V. Pavlunin B. Sanghi E. I. Shibata

We investigate the decays D(0)-->pi(-)l(+)nu and D(0)-->K(-)l(+)nu, where l is e or mu, using approximately 7 fb(-1) of data collected with the CLEO III detector. We find R(0) identical with B(D(0)-->pi(-)e(+)nu)/B(D(0)-->K(-)e(+)nu)=0.082+/-0.006+/-0.005. Fits to the kinematic distributions of the data provide parameters describing the form factor of each mode. Combining the form factor results and R(0) gives |f(pi)(+)(0)|(2)|V(cd)|(2)/|f(K)(+)(0)|(2)|V(cs)|(2)=0.038(+0.006+0.005)(-0.007-0.003).

Charm (quantum number)

Semileptonic decay

10.1103/physrevlett.94.011802

Cite

Citations (46)

Erratum: Searches for CP violation and ππ S wave in the Dalitz-plot analysis of D0→π+π-π0 (Physical Review D - Particles, Fields, Gravitation and Cosmology (2005) 72, (031102))

arXiv (Cornell University) (2007)

D. Cronin-Hennessey K. Y. Gao D. T. Gong J. Hietala Y. Kubota

Dalitz plot

Source

Cite

Citations (3)

Measurement of the cross section for γγ→pp¯

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (1994)

M. Artuso D. He M. Goldberg N. Horwitz R. Kennett

A measurement of the cross section for γγ→pp¯ is performed at two-photon center-of-mass energies between 2.00 and 3.25 GeV. These results are obtained using e+e−→e+e−pp¯ events selected from 1.31 fb−1 of data taken with the CLEO II detector. The measured cross section is in reasonable agreement with previous measurements and is in excellent agreement with recent calculations based on a diquark model. However, leading order QCD calculations performed using the Brodsky-Lepage formalism are well below the measured cross section.Received 1 September 1993DOI:https://doi.org/10.1103/PhysRevD.50.5484©1994 American Physical Society

Formalism (music)

Diquark

10.1103/physrevd.50.5484

Cite

Citations (26)

Flavor-Specific InclusiveBDecays to Charm

Physical Review Letters (1998)

T. E. Coan V. Fadeyev I. Korolkov Y. Maravin I. Narsky

We have measured the branching fractions for B -> D_bar X, B -> D X, and B -> D_bar X \ell^+ \nu, where ``B'' is an average over B^0 and B^+, ``D'' is a sum over D^0 and D^+, and``D_bar'' is a sum over D^0_bar and D^-. From these results and some previously measured branching fractions, we obtain Br(b -> c c_bar s) = (21.9 $\pm$ 3.7)%, Br(b -> s g) < 6.8% @ 90% c.l, and Br(D^0 -> K^- \pi^+) = (3.69 $\pm$ 0.20)%. Implications for the ``B semileptonic decay problem'' (measured branching fraction being below theoretical expectations) are discussed. The increase in the value of Br(b -> c c_bar s) due to $B -> D X$ eliminates 40% of the discrepancy.

Bar (unit)

Branching fraction

Branching (polymer chemistry)

10.1103/physrevlett.80.1150

Cite

Citations (60)

WIDE-ANGLE ELECTRON-ELECTRON SCATTERING ON THE PRINCETON-STANFORD STORAGE RINGS

William C. Barber B. Gittelman Gerard K. O'Neill B. Richter

Abstract : The angular distribution of 416 electron-electron scattering events occurring when beams of 300 MeV electrons collide has been measured. The experimental angular distribution was compared with that predicted by the Moller formula with a cut-off on the photon propagator. The best fit occurs for 1/K = about 0.18 Fermi. The value 1/K = O (no breakdown of quantum electrodynamics) is only one standard deviation from the best fit.

Electron scattering

Propagator

Source

Cite

Citations (0)