I. Danko | Researchain

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Featured researches published by I. Danko.

Physical Review D | 2007

Measurement of B({upsilon}(5S){yields}B{sub s}{sup ()}B{sub s}{sup ()}) using {phi} mesons

G. S. Huang; D. H. Miller; V. Pavlunin; B. Sanghi; I. P. J. Shipsey; B. Xin; G. S. Adams; M. Anderson; J. P. Cummings; I. Danko; J. Napolitano; Q. He; J. Insler; H. Muramatsu; Cheol Park; E. H. Thorndike; F. Yang; T. E. Coan; Yuqing Gao; F. Liu

Knowledge of the B{sub s} decay fraction of the {upsilon}(5S) resonance, f{sub S}, is important for B{sub s} meson studies at the {upsilon}(5S) energy. Using a data sample collected by the CLEO III detector at CESR consisting of 0.423 fb{sup -1} on the {upsilon}(5S) resonance, 6.34 fb{sup -1} on the {upsilon}(4S) and 2.32 fb{sup -1} in the continuum below the {upsilon}(4S), we measure B({upsilon}(5S){yields}{phi}X)=(13.8{+-}0.7{sub -1.5}{sup +2.3})% and B({upsilon}(4S){yields}{phi}X)=(7.1{+-}0.1{+-}0.6)%; the ratio of the two rates is (1.9{+-}0.1{sub -0.2}{sup +0.3}). This is the first measurement of the {phi} meson yield from the {upsilon}(5S). Using these rates, and a model dependent estimate of B(B{sub s}{yields}{phi}X), we determine f{sub S}=(24.6{+-}2.9{sub -5.3}{sup +11.0})%. We also update our previous independent measurement of f{sub S} made using the inclusive D{sub s} yields to now be (16.8{+-}2.6{sub -3.4}{sup +6.7})%, due to a better estimate of the number of hadronic events. We also report the total {upsilon}(5S) hadronic cross section above continuum to be {sigma}(e{sup +}e{sup -}{yields}{upsilon}(5S))=(0.301{+-}0.002{+-}0.039) nb. This allows us to extract the fraction of B mesons as (58.9{+-}10.0{+-}9.2)%, equal to 1-f{sub S}. Averaging the three methods gives a model dependent result of f{sub S}=(21{sub -3}{sup +6})%.

Physical Review D | 2006

Branching fraction for the doubly-Cabibbo-suppressed decay D{sup +}{yields}K{sup +}{pi}{sup 0}

S. A. Dytman; W. Love; V. Savinov; O. Aquines; Zheng Li; Angel Lopez; S. Mehrabyan; H. Mendez; J. Ramirez; G. S. Huang; D. H. Miller; V. Pavlunin; B. Sanghi; I. P. J. Shipsey; B. Xin; G. S. Adams; M. Anderson; J. P. Cummings; I. Danko; J. Napolitano

We present a measurement of the branching fraction for the doubly-Cabibbo-suppressed decay D{sup +}{yields}K{sup +}{pi}{sup 0}, using 281 pb{sup -1} of data accumulated with the CLEO-c detector on the {psi}(3770) resonance. We find B(D{sup +}{yields}K{sup +}{pi}{sup 0})=(2.28{+-}0.36{+-}0.15{+-}0.08)x10{sup -4}, where the first uncertainty is statistical, the second is systematic, and the last error is due to the uncertainty in the reference mode branching fraction.

Physical Review D | 2005

Measurement of the branching fractions for J/{psi}{yields}l{sup +}l{sup -}

Zheng Li; Angel Lopez; H. Mendez; J. Ramirez; G. S. Huang; D. H. Miller; V. Pavlunin; B. Sanghi; E. I. Shibata; I. P. J. Shipsey; G. S. Adams; M. Chasse; M. Cravey; J. P. Cummings; I. Danko; J. Napolitano; Q. He; H. Muramatsu; Cheol Park; Wounjhang Park

We present measurements of the branching fractions for J/psi --> e+e- and mu+mu- using 3M psi(2S) decays collected with the CLEO detector operating at the CESR e+e- collider. We obtain B(J/psi --> e+e-) = (5.945 +- 0.067 +- 0.042 )% and B(J/psi --> mu+mu-) = (5.960 +- 0.065 +- 0.050)%, leading to an average of B(J/psi --> l+l-) = (5.953 +- 0.056 +- 0.042)% and a ratio of B(J/psi --> e+e-) / B(J/psi --> mu+mu-) = (99.7 +- 1.2 +- 0.6)%, all consistent with, but more precise than, previous measurements.