R. Fulton

A search for exclusive penguin decays of B mesons

Abstract We have measured upper limits on branching fractions for rare exclusive decays of B mesons arising from one-loop diagrams in the standard model of electroweak interactions. We also obtain an upper limit for the lepton-number-violating decay B 0 → μ ± e ∓ .

Measurement of the isospin mass splitting Ξ+cΞ0c

Abstract Using the CLEO detector, we present a measurement of the mass of the charged charmed strange baryon Ξ + c and its neutral counterpart the Ξ 0 c . The Ξ + c is observed through its decay to Ξ - π + π + , and its mass is measured to be (2467±3±4) MeV. The isospin mass splitting of the Ξ c system is found to be M ( Ξ + c )- M ( Ξ 0 c )=(−5±4±1)MeV.

Determination of B(Ds+) via observation of Ds+l+1/2

Using the CLEO detector at the Cornell Electron Storage Ring (CESR), we have determined the ratio {Gamma}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital l}{sup +}{nu})/{Gamma}({ital D}{sub {ital s}}{sup +} {r arrow}{phi}{pi}{sup +})=0.49{plus minus}0.10{sub {minus}0.14}{sup +0.10}. We use this measurement to derive {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}).

Measurement of γγ widths of charmonium states

Abstract Using the CLEO detector at the Cornell Electron Storage Ring, we have searched for two-photon production of charmonium in four-track final states. We have measured Γ γγ ( η c )=5.9 +2.1 −1.8 ±1.9 keV, and we have obtained 95% CL upper limits of Γ γγ ( X c 0 ) Γ γγ ( X c 2 )

First observation of inclusive ψ production in ψ decays

The branching ratio for inclusive ψ production in ψ(1S) decays is measured to be (0.11 ± 0.04 ± 0.02)%.

Measurement of Ds decay modes

Abstract Using the CLEO detector, we have measured the branching ratios for the exclusive decays of the D s + meson into K ∗0 K + , K 0 K + , and K ∗+ K 0 relative to the decay D s + →φπ + to be close to unity. We have also measured the mass diference between the D s + and D + meson to be 98.5±1.5 MeV/ c 2 .

New Measurement of {ital B} {r_arrow} {ital D}{sup {asterisk}}{ital {pi}} Branching Fractions

The decays {Upsilon}(4S){r_arrow}B{ovr B} , followed by B{r_arrow}D{sup {asterisk}}{pi} and D{sup {asterisk}}{r_arrow}D{pi} , permit reconstruction of all kinematic quantities that describe the sequence without reconstruction of the D , with reasonably low backgrounds. Using an integrated e{sup +}e{sup {minus}} luminosity of 3.1 fb{sup {minus}1} accumulated at the {Upsilon}(4S) by the CLEO-II detector, we report measurements of B({ovr B}{sup 0}{r_arrow} D{sup {asterisk}+}{pi}{sup {minus}})=(2.81{plus_minus} 0.11{plus_minus}0.21{plus_minus}0.05){times}10{sup {minus}3} and B(B{sup {minus}}{r_arrow}D{sup {asterisk}0}{pi}{sup {minus}})=(4.34{plus_minus}0.33{plus_minus}0.34{plus_minus}0.1 8){times}10{sup {minus}3} . {copyright} {ital 1998} {ital The American Physical Society}The decays {Upsilon}(4S) {yields} B{bar B}, followed by B {yields} D*{pi} and D* {yields} D{pi}, permit reconstruction of all kinematic quantities that describe the sequence without reconstruction of the D, with reasonably low backgrounds. Using an integrated e{sup +}e{sup -} luminosity of 3.1 fb{sup -1} accumulated at the {Upsilon}(4S) by the CLEO-II detector, we report measurements of {Beta}({bar B}{sup 0} {yields} D*{sup +}{pi}{sup -}) = (2.81 {+-} 0.11 {+-} 0.21 {+-} 0.05) x 10{sup -3} and {Beta}(B{sup -} {yields} D*{sup 0}{pi}{sup -}) = (4.34 {+-} 0.33 {+-} 0.34 {+-} 0.18) x 10{sup -3}.

{Lambda}{bar {Lambda}} production in two-photon interactions

Using the CLEO detector at the Cornell e{sup +}e{sup {minus}} storage ring CESR we study the two-photon production of {Lambda}{bar {Lambda}}, making the first observation of {gamma}{gamma}{r_arrow}{Lambda}{bar {Lambda}}. We present the cross section for {gamma}{gamma}{r_arrow}{Lambda}{bar {Lambda}} as a function of the {gamma}{gamma} center of mass energy and compare it to that predicted by the quark-diquark model. {copyright} {ital 1997} {ital The American Physical Society}

Study of gluon versus quark fragmentation in {Upsilon}{r_arrow}gg{gamma} and e{sup +}e{sup {minus}}{r_arrow}q{bar q}{gamma} events at {radical}(s)=10 GeV

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we determine the ratio R(chrg) for the mean charged multiplicity observed in Upsilon(1S)->gggamma events, to the mean charged multiplicity observed in e+e- -> qqbar gamma events. We find R(chrg)=1.04+/-0.02+/-0.05 for jet-jet masses less than 7 GeV.

Measurement of the form factors for B-bar0-->D*+

Using a sample of 2.6 x 10{sup 67} {Upsilon}(4S) {yields} B{bar B} events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have measured the form factors for {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}. We perform a three-parameter fit to the joint distribution of four kinematic variables to obtain the form factor ratios R{sub 1} = 1.18 {+-} 0.30 {+-} 0.12 and R{sub 2} = 0.71 {+-} 0.22 {+-} 0.07; and the form-factor slope {rho}{sub A{sub 1}}{sup 2} = 0.91 {+-} 0.15 {+-} 0.06, which is closely related to the slope of the Isgur-Wise function. The form factor ratios are consistent with predicted corrections to the heavy-quark symmetry limit of R{sub 1} = R{sub 2} = 1.