T. Živko

Publications (70)38.81 Total impact

• Article: V0 production in p+A collisions at GeV

  The HERA-B Collaboration, I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S. J. Aplin, V. Aushev, [......], A. Wurz, S. Xella-Hansen, Yu. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli
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  ABSTRACT: Inclusive doubly differential cross sections d 2 σ pA /dx F   dp T 2 as a function of Feynman-x (x F ) and transverse momentum (p T ) for the production of K S 0, Λ and [`\varLambda]\bar{\varLambda} in proton-nucleus interactions at 920GeV are presented. The measurements were performed by HERA-B in the negative x F range (−0.12<x F <0.0) and for transverse momenta up to p T =1.6GeV/c. Results for three target materials: carbon, titanium and tungsten are given. The ratios of production cross sections are presented and discussed. The Cronin effect is clearly observed for all three V 0 species. The atomic number dependence is parameterized as σ pA =σ pN ⋅A α where σ pN is the proton-nucleon cross section. The measured values of α are all near one. The results are compared with EPOS1.67 and PYTHIA6.3. EPOS reproduces the data to within ≈20% except at very low transverse momentum. PACS13.85.Hd-14.20.Jn-14.40.Aq
  European Physical Journal C 05/2012; 61(2):207-221. · 3.63 Impact Factor
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  Available from: Mikhail Negodaev

  Article: Kinematic distributions and nuclear effects of J/ψ production in 920 GeV fixed-target proton-nucleus collisions

  The HERA-B Collaboration, I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S. J. Aplin, V. Aushev, [......], A. Wurz, S. Xella-Hansen, Yu. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli
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  ABSTRACT: Measurements of the kinematic distributions of J/ψ mesons produced in p–C, p–Ti and p–W collisions at Ös=41.6GeV\sqrt{s}=41.6~\mathrm{GeV} in the Feynman-x region −0.34<x F <0.14 and for transverse momentum up to p T =5.4GeV/c are presented. The x F and p T dependencies of the nuclear suppression parameter, α, are also given. The results are based on 2.4×105 J/ψ mesons reconstructed in both the e + e − and μ + μ − decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of x F for the first time. The average value of α in the measured x F region is 0.981±0.015. The data suggest that the strong nuclear suppression of J/ψ production previously observed at high x F turns into an enhancement at negative x F .
  European Physical Journal C 04/2012; 60(4):525-542. · 3.63 Impact Factor
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  Available from: Mikhail Negodaev

  Article: Angular distributions of leptons from J/ψ’s produced in 920 GeV fixed-target proton-nucleus collisions

  I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S. J. Aplin, V. Aushev, Y. Bagaturia, [......], A. Wurz, S. Xella-Hansen, Yu. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli
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  ABSTRACT: A study of the angular distributions of leptons from decays of J/ψ’s produced in p-C and p-W collisions at Ös=41.6GeV\sqrt{s}=41.6\mbox{~GeV} has been performed in the J/ψ Feynman-x region −0.34<x F <0.14 and for J/ψ transverse momenta up to 5.4GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3×105 J/ψ’s reconstructed in both the e + e − and μ + μ − decay channels, indicate that J/ψ’s are produced polarized. The magnitude of the effect is maximal at lowp T . For p T >1GeV/c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Soper frame and almost vanishes in the helicity frame, where, instead, asignificant azimuthal anisotropy arises.
  European Physical Journal C 04/2012; 60(4):517-524. · 3.63 Impact Factor
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  Available from: Mikhail Negodaev

  Article: K*0 and φ meson production in proton–nucleus interactions at

  I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S.J. Aplin, V. Aushev, Y. Bagaturia, [......], R. Wurth, A. Wurz, Y. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli
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  ABSTRACT: The inclusive production cross sections of the strange vector mesons K*0, K̄*0, and φ have been measured in interactions of 920GeV protons with C, Ti, and W targets with the HERA-B detector at the HERA storage ring. Differential cross sections as a function of rapidity and transverse momentum have been measured in the central rapidity region and for transverse momenta up to pT = 3.5GeV/c. The atomic number dependence is parametrised as σpA=σpN*Aα, where σpN is the proton–nucleon cross section. Within the phase space accessible, α(K*0)=0.86±0.03, α(K̄*0)=0.87±0.03, and α(φ)=0.96±0.02. The total proton–nucleon cross sections, determined by extrapolating the differential measurements to full phase space, are σpN→K*0=(5.06±0.54) mb, σpN→K̄*0=(4.02±0.45) mb, and σpN→φ=(1.17±0.11) mb. For all resonances the Cronin effect is observed; compared to the measurements of Cronin et al. for K± mesons, the measured values of α for φ mesons coincide with those of K+ mesons for all transverse momenta, while the enhancement for K*0/K̄*0 mesons is smaller.
  European Physical Journal C 04/2012; 50(2):315-328. · 3.63 Impact Factor
• Article: Production of the charmonium states χc1 and χc2 in proton nucleus interactions at √s=41.6 GeV

  I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S. J. Aplin, V. Aushev, Y. Bagaturia, [......], A. Wurz, S. Xella-Hansen, Yu. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli
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  ABSTRACT: A measurement of the ratio Rχc=(χc→J/ψ+γ)/J/ψ in pC, pTi, and pW interactions at 920 GeV/c (√s=41.6 GeV) in the Feynman-x range -0.35<xFJ/ψ<0.15 is presented. Both μ+μ- and e+e- J/ψ decay channels are observed with an overall statistics of about 15 000 χc events, which is by far the largest available sample in pA collisions. The result is Rχc=0.188±0.013st+0.024/-0.022sys averaged over the different materials, when no J/ψ and χc polarizations are considered. The χc1 to χc2 production ratio R12=Rχc1/Rχc2 is measured to be 1.02±0.40, leading to a cross section ratio σ(χc1)/σ(χc2)=0.57±0.23. The dependence of Rχc on the Feynman-x of the J/ψ, xFJ/ψ, and its transverse momentum, pTJ/ψ, is studied, as well as its dependence on the atomic number, A, of the target. For the first time, an extensive study of possible biases on Rχc and R12 due to the dependence of acceptance on the polarization states of J/ψ and χc is performed. By varying the polarization parameter, λobs, of all produced J/ψ’s by two sigma around the value measured by HERA-B, and considering the maximum variation due to the possible χc1 and χc2 polarizations, it is shown that Rχc could change by a factor between 1.02 and 1.21 and R12 by a factor between 0.89 and 1.16.
  Phys. Rev. D. 01/2009; 79(1).
• Article: Measurement of D0, D+, Ds+ and D*+ production in fixed target 920 GeV proton–nucleus collisions

  I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S.J. Aplin, V. Aushev, Y. Bagaturia, [......], S. Xella-Hansen, Y. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli, The HERA-B Collaboration
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  ABSTRACT: The inclusive production cross sections of the charmed mesons D0,D+,Ds + and D*+ have been measured in interactions of 920GeV protons on C, Ti, and W targets with the HERA-B detector at the HERA storage ring. Differential cross sections as a function of transverse momentum and Feynman’s x variable are given for the central rapidity region and for transverse momenta up to pT=3.5GeV/c. The atomic mass number dependence and the leading to non-leading particle production asymmetries are presented as well.
  European Physical Journal C 01/2007; 52(3):531-542. · 3.63 Impact Factor
• Article: A Measurement of the ψ′ to J/ψ production ratio in 920 GeV proton-nucleus interactions

  I. Abt, M. Adams, M. Agari, H. Albrecht, A. Aleksandrov, V. Amaral, A. Amorim, S.J. Aplin, V. Aushev, Y. Bagaturia, [......], A. Wurz, Y. Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli, The HERA-B Collaboration
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  ABSTRACT: Ratios of the ψ′ over the J/ψ production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The ψ′ and J/ψ states were reconstructed in both the μ+μ- and the e+e- decay modes. The measurements covered the kinematic range -0.35≤xF≤0.1 with transverse momentum pT≤4.5GeV/c. The angular dependence of the ratio has been used to measure the difference of the ψ′ and J/ψ polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is Rψ′(μ)/Rψ′(e)=1.00±0.08±0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B′(μ)B(e))/(B(μ)B′(e)), of ψ′ and J/ψ in the two channels. The ψ′ to J/ψ production ratio is almost constant in the covered xF range and shows a slow increase with pT.
  European Physical Journal C 12/2006; 49(2):545-558. · 3.63 Impact Factor
• Article: Two-photon production of ω pairs

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], A. Golutvin, O. Igonkina, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: A maximum likelihood analysis of ARGUS data on two-photon production of π+π+π0π0π-π- is presented. A small fraction of events is due to the production of omega pairs. The γγ -> ωω cross section has its maximum value close to threshold.
  Physics Letters B 01/1996; 374:265-270. · 3.95 Impact Factor
• Article: Measurement of the decay D* s2+ (2573) → D0K+

  ARGUS Collaboration, H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, [......], Yu Gershtein, A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, Lnn Tichomirov, Yu Zaitsev
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  ABSTRACT: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY we have measured the parameters of a charmed strange meson D* s2 + (2573) decaying into D0K+. The mass of this state was found to be (2574.5±3.3±1.6) MeV/c 2. The measured value of its width is (10.4±8.3±3.0) MeV and the product of the production cross section and branching ratio for this channel was determined to be (10.6±4.2 −1.2 +2.3 ) pb.
  Zeitschrift für Physik C 11/1995; 69(1):405-408.
• Article: A measurement of the electronic widths Γee of the ϒ(1S), ϒ(2S), and ϒ(4S) resonances, and of the total decay width Γ of the ϒ(4S)

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], Yu. Gershtein, A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: The partial decay width into electrons, ee , of the (1S) and (2S) resonances have been measured with the detector ARGUS at thee + e – storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: ee ((1S))= (1.320.040.03) keV and ee ((2S))=(0.520.030.01) keV. The total decay width of the (4S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width (s) and a mass shift functionm(s), we obtain the following resonance parameters: (M 2)=(10.02.82.7) MeV, ee =(0.280.050.01)keV andB ee =(2.770.500.49)10–5. We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed (4S) resonance cross section.
  Zeitschrift für Physik C 11/1995; 65(4):619-625.
• Article: A measurement of the electronic widths Γ ee of the ϒ(1 S), ϒ(2 S), and ϒ(4 S) resonances, and of the total decay width Γ of the ϒ(4 S)

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], Yu. Gershtein, A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: The partial decay width into electrons, Γ ee , of the ϒ(1 S) and ϒ(2 S) resonances have been measured with the detector ARGUS at the e + e - storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: Γ ee (ϒ(1 S))= (1.32±0.04±0.03) keV and Γ ee (ϒ(2 S))=(0.52±0.03±0.01) keV. The total decay width of the ϒ(4 S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width Γ( s) and a mass shift function m(s), we obtain the following resonance parameters: Γ( M 2)=(10.0±2.8±2.7) MeV, Γ ee =(0.28±0.05±0.01)keV and B ee =(2.77±0.50±0.49)·10-5. We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed ϒ(4 S) resonance cross section.
  Zeitschrift für Physik C 11/1995; 65:619-625.
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  Available from: cdsweb.cern.ch

  Article: A search for the lepton-flavour violating decays τ → eα, τ → μα

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], A. Golutvin, O. Igonkina, I. Korolko, G. Kostina, D. Litvintsev, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: Lepton spectra in decays have been studied with the ARGUS detector at thee + e – storage ring DORIS II at DESY using the pseudo-rest-frame technique. We have improved upper limits for two-body -decays into a lepton and an unobservable particle.
  Zeitschrift für Physik C 02/1995; 68(1):25-28.
• Article: Measurement of the decay fractions ofD* mesons

  H. Albrecht, H. Ehrlichmann, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, [......], G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, A. Undrus, Yu. Zaitsev, V. Zhilich
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  ABSTRACT: Using the ARGUS detector at the DORIS II electron-positron storage ring at DESY, we have measured BR(D *+D 0+)=(68.82.41.3)%, BR(D *+D +0)=(31.21.10.8)%, BR(D *+D +)D *0D 00)=(59.63.52.8)%, and BR(D *0D 0)=(40.43.52.8)%, and the mass difference m 0=m(D *0)–m(D 0)=(142.20.30.2)MeV/c 2.
  Zeitschrift für Physik C 01/1995; 66(1):63-70.
• Article: Determination of the structure of τ decays in the reaction e+e- --> τ+τ- --> ϱ+vτϱ-vτ and a precision measurement of the τ-neutrino helicity

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e+e- --> τ+τ- --> vτπ+ π0 vτπ-π0 are exploited for a measurement of the normalized product of the vector (gV) and axial vector (gA) couplings of the τ lepton, γinAV = 2 Re{gAgV*}/(gV2). The correlations are sensitive to the product of the couplings in both τ decays: γAV2 = γAV(τ- --> ντW-) AV = -h(vτ)h(vτ). The measured value, γAV2 = 1.044+/-0.057+/-0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value γAV = 1.022+/-0.028+/-0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar (gs) or pseudoscalar (gP) couplings was also investigated. No evidence for a scalar-like coupling was found. Supported by the Ministry of Science and Technology of the Republic of Slovenia and the Internationales Büro KfA, Jülich.
  Physics Letters B 09/1994; 337:383-392. · 3.95 Impact Factor
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  Available from: citeseerx.ist.psu.edu

  Article: Study ofD0 andD+ decays into final states with two or three kaons

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: Using the ARGUS detector at thee + e – storage ring DORIS II, we have studied Cabibbo-suppressedD 0 decay modes resulting in theK + K – + – final state and two-bodyD 0 decay modes with a meson in the final state. TheBR(D 0K S 0 K S 0 +– was measured for the first time. We also present a measurement of theD + K S 0 K S 0 K + branching ratio. The values are compared with other experimental results and model predictions.
  Zeitschrift für Physik C 08/1994; 64(3):375-380.
• Article: Study of D 0 and D + decays into final states with two or three kaons

  H. Albrecht, T. Hamacher, R. P. Hofmann, T. Kirchhoff, R. Mankel, A. Nau, S. Nowak, D. Reßing, H. Schröder, H. D. Schulz, [......], A. Golutvin, I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: Using the ARGUS detector at the e + e - storage ring DORIS II, we have studied Cabibbo-suppressed D 0 decay modes resulting in the K + K - π + π - final state and two-body D 0 decay modes with a ϕ meson in the final state. The BR( D 0→ K {/S 0} K {/S 0}π+π- was measured for the first time. We also present a measurement of the D + →K {/S 0} K {/S 0} K + branching ratio. The values are compared with other experimental results and model predictions.
  Zeitschrift für Physik C 08/1994; 64:375-380.
• Article: Inclusive production ofK*(892),ρ0, andω(783) mesons in theϒ energy region

  H. Albrecht, H. Ehrlichmann, T. Hamacher, R. P. Hofmann, T. Kirchhoff, A. Nau, S. Nowak, H. Schröder, H. D. Schulz, M. Walter, [......], I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, V. Soloshenko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: The production ofK *+(892),K *0(892), 0(770) and(783) vector mesons in 0(770) events as well as in the gluonic (1S) decays and 0(770) decays has been studied using the ARGUS detector. Combining these results with data on pseudoscalar meson, meson and baryon production collected with the same detector allow comprehensive studies of quark and gluon fragmentation. Model independent information ons quark and vector meson suppression (s/u=0.370.04,V/(V+P) =0.210.04 andV/(V+P) K =0.340.03)) are derived. The data are compared with predictions from the models Jetset 7.3 and UCLA 7.31.
  Zeitschrift für Physik C 02/1994; 61(1):1-17.
• Article: Inclusive production of K *(892), ρ 0, and ω(783) mesons in the ϒ energy region

  H. Albrecht, H. Ehrlichmann, T. Hamacher, R. P. Hofmann, T. Kirchhoff, A. Nau, S. Nowak, H. Schröder, H. D. Schulz, M. Walter, [......], I. Korolko, G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, S. Semenov, A. Snizhko, V. Soloshenko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: The production of K *+(892), K *0(892), ρ 0(770) and ω(783) vector mesons in ρ 0(770) events as well as in the gluonic Υ(1 S) decays and ρ 0(770) decays has been studied using the ARGUS detector. Combining these results with data on pseudoscalar meson, ϕ meson and baryon production collected with the same detector allow comprehensive studies of quark and gluon fragmentation. Model independent information on s quark and vector meson suppression ( s/u=0.37±0.04, V/(V+P) π=0.21±0.04 and V/(V+P) K =0.34±0.03)) are derived. The data are compared with predictions from the models Jetset 7.3 and UCLA 7.31.
  Zeitschrift für Physik C 02/1994; 61:1-17.
• Article: Kaons in flavour taggedB decays

  H. Albrecht, H. Ehrlichmann, T. Hamacher, R. P. Hofmann, T. Kirchhoff, A. Nau, S. Nowak, H. Schröder, H. D. Schulz, M. Walter, [......], G. Kostina, D. Litvintsev, V. Lubimov, P. Pakhlov, F. Ratnikov, S. Semenov, A. Snizhko, V. Soloshenko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: Using the ARGUS detector at thee + e – storage ring DORIS II, flavour-dependent kaon production inB meson decays has been studied. Using the leptons as flavour tags, it has been possible to separately measure the multiplicities ofK +,K – andK s 0 in inclusiveB decays and in semileptonicB decays. The kaon production in semileptonicB decays was further used to estimate the ratio of charmed decays over all decays, and thus also the fraction of charmlessB decays.
  Zeitschrift für Physik C 01/1994; 62(3):371-381.
• Article: Investigation of the decays and

  H. Albrecht, H. Ehrlichmann, T. Hamacher, R. P. Hofmann, T. Kirchhoff, A. Nau, S. Nowak, H. Schröder, H. D. Schulz, M. Walter, [......], I. Gorelov, G. Kostina, V. Lubimov, P. Pakhlov, F. Ratnikov, S. Semenov, V. Shibaev, V. Soloshenko, I. Tichomirov, Yu. Zaitsev
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  ABSTRACT: Exclusive semileptonicB decays with aD *+ meson in the final state have been studied using the ARGUS detector at the DORIS II storage ring. The branching ratio for the decay [`(B)]0 ® D* + l- [`(v)]\bar B^0 \to D^{* + } \ell ^ - \bar v , where [`(B)] ® D** l- [`(v)]\bar B \to D^{**} \ell ^ - \bar v has been observed. From an angular analysis of the cascade [`(B)]0 ® D* + ( ® D0 p+ )l- [`(v)]\bar B^0 \to D^{* + } ( \to D^0 \pi ^ + )\ell ^ - \bar v the forward-backward asymmetryA FB and theD *+ polarization parameter have been determined to beA FB=0.200.080.06 and =1.10.40.2.
  Zeitschrift für Physik C 11/1993; 57(4):533-540.