Showing papers by "Hermann Kolanoski published in 1992"
TL;DR: Using the ARGUS detector at the DORIS II storage ring, a new measurement of the mass of the τ lepton has been obtained using the tau pseudomass spectrum for decays of the type τ− → π−π−π+ντ as mentioned in this paper.
81 citations
TL;DR: In this paper, the final state in interactions of quasi-real photons with protons was investigated with the H1 detector at the HERA ep collider and the data can best be described by inclusion of resolved photon processess as predicted by QCD.
74 citations
Technical University of Dortmund1, University of Erlangen-Nuremberg2, University of Hamburg3, Heidelberg University4, Max Planck Society5, Natural Sciences and Engineering Research Council6, Karlsruhe Institute of Technology7, University of Ljubljana8, Swedish Research Council9, University of South Carolina10
TL;DR: In this paper, the ARGUS detector at the e + e − storage ring DORIS II at DESY has observed parity violation in the decay Λ ± c → Λπ ±.
30 citations
TL;DR: In this article, the ARGUS detector at DORIS II has been used to study the production of mesons in B meson decays, and inq\(\bar q\) continuum events.
Abstract: The production ofDS+ mesons inB meson decays, and inq\(\bar q\) continuum events, has been studied with the ARGUS detector at thee+e− storage ring DORIS II. In addition to the measurement of inclusiveDS+ production in γ(4S)→B\(\bar B\) decays, all eight two-body decay modesB→DS(*)D(*) have been measured with branching ratios between 1% and 3%. By comparing our inclusive and exclusive results to predictions of heavy quark effective theory, a value of (267±28) MeV × [2.7%/BR(Ds+→φπ+)]1/2 is obtained for the weak decay constant fDS(*), averaged overDS+ andDS*+ mesons.
29 citations
TL;DR: In this paper, the authors used the detector ARGUS at the storage ring DORIS II of DESY to find evidence for the production of the charmed and doubly strange baryon Ω c through its decay channel Ξ − K − π + π+.
18 citations
TL;DR: In this article, the ARGUS detector at the storage ring DORIS II was used to measure the ratio of the hadronic cross-section to the μ-pair cross section in lowest order QED, which was determined to beR=3.46±0.13.
Abstract: We have measured theR value in non-resonante+e− annihilation using the ARGUS detector at the storage ring DORIS II. At a centre-of-mass energy\(\sqrt s = 9.36\) GeV the ratio of the hadronic cross-section to the μ-pair cross section in lowest order QED has been determined to beR=3.46±0.03±0.13. In addition, we have measured the charged-particle multiplicities in non-resonant hadron production at\(\sqrt s = 10.47\) GeV just below theB\(\bar B\) threshold and in ϒ (4S) resonance decays. For the average charged-particle multiplicities in continuum events and ϒ(4S)→B\(\bar B\) decays we obtain cont=8.35±0.02±0.20 and ϒ(4s)=10.81±0.05±0.23.
18 citations
TL;DR: Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, this paper obtained a value for the branching ratio of BR (B − → D ∗0 l − λ )= (5.8 ± 1.3)%.
17 citations
TL;DR: Using the ARGUS detector at the DESY storage ring DORIS II at DESY, the authors showed that meson decays into baryonsp and Λ.
Abstract: Using the ARGUS detector at thee
+
e
− storage ring DORIS II at DESY, we have studiedB meson decays into baryonsp and Λ. From the simultaneous analysis ofp and Λ yields,p
$$\bar p$$
and Λ
$$\bar p$$
correlations, and various lepton-baryon and lepton-baryon-antibaryon correlations the inclusive branching ratio is found to be BR (B→baryons)=(6.8±0.5±0.3)%.
16 citations
TL;DR: Using the ARGUS detector at the DORIS II storage ring, this article studied τ decays with one or three charged particles in the final state, obtaining the following values for the branching ratios: BR(τ−→e istg−====== � )=(173±04±05)% BR(π−→μ−¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ � ) = 133±03±08%) and BR(β−→π−π−3-prong)=(133±03+08%) with a precision comparable to the
Abstract: Using the ARGUS detector at the DORIS II storage ring, we have studied τ decays with one or three charged particles in the final state, obtaining the following values for the branching ratios: BR(τ−→e
−
$$\bar v_e v_\tau $$
)=(173±04±05)% BR(τ−→μ−
$$\bar v_\mu v_\tau $$
)=(172±04±05)%,BR(τ−→π−
v
π)+BR(τ−→K
−
v
π)=(117±06±08)% and BR(π−→3-prong)=(133±03±08)% These measurements confirm the present world averages with a precision, in each case, comparable to the error on the combination of all previous results
14 citations
Technical University of Dortmund1, University of Erlangen-Nuremberg2, University of Hamburg3, Heidelberg University4, Max Planck Society5, Science and Engineering Research Council6, Karlsruhe Institute of Technology7, University of Ljubljana8, Swedish Research Council9, United States Department of Energy10
TL;DR: In this paper, the first evidence for B meson decays into χ c mesons was obtained using the ARGUS detector at the e + e − storage ring DORIS II at DESY.
13 citations
Technical University of Dortmund1, University of Erlangen-Nuremberg2, University of Hamburg3, Heidelberg University4, Max Planck Society5, Natural Sciences and Engineering Research Council6, Karlsruhe Institute of Technology7, University of Ljubljana8, Swedish Research Council9, University of South Carolina10
TL;DR: Using the ARGUS detector at the DORIS-II storage ring at DESY, this article measured the inclusive semileptonic branching ratio of charmed hadrons produced in e+e− annihilition at =10 GeV to be BR(c→eveX)=(9.8±0.5 0.6)%
TL;DR: Using the ARGUS detector at the e + e - storage ring using DORIS II at DESY, a new decay channel for the excited charm-strange meson D s1 (2536) + →D∗ O K + ǫ + K 0 s was observed in this paper.
TL;DR: In this paper, the ARGUS detector at thee+e−e− storage ring DORIS II at DESY has been used to perform a study of B0\(\bar B^0 \) oscillations using three different techniques.
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II at DESY, a study ofB0\(\bar B^0 \) oscillations has been performed using three different techniques. Besides the standard dilepton method, charge correlations betweenD* mesons and one or two leptons have also been investigated. The mixing parameterr is determined to be (20.6±7.0)%.
TL;DR: Using the ARGUS detector at thee+e− storage ring DORIS II, the authors studied nine decay modes of the D0 meson and observed several new channels for the first time.
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied nine decay modes of theD0 meson. In addition to a higher-precision determination of the branching ratios for these modes, several new channels, the decays\(D^0 \to \bar K^0 \eta '\),\(D^0 \to \bar K^{*0} \omega \) and\(D^0 \to \bar K\pi ^ + \omega \), have been observed for the first time.
TL;DR: In this article, the upper limits on branching ratios for six neutrinoless leptonic, 16 semileptonic (SLE), two radiative-leptonic and three purely hadronic τ decays have been determined.
Abstract: Upper limits on branching ratios for six neutrinoless leptonic, 16 semileptonic, two radiative-leptonic, two radiative-hadronic and three purely hadronic τ decays have been determined. The results improve over previously published ones by about a factor of two. For the first time the lepton and baryon number violating decays\(\tau ^ - \to \bar p\gamma ,\tau ^ - \to \bar p\pi ^0 \) and\(\tau ^ - \to \bar p\eta \) have been investigated. The 90% confidence level (CL) limits for the corresponding branching ratios amount to 2.9×10−4, 6.6×10−4 and 1.3×10−3 respectively.
TL;DR: In this paper, an analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring, and the branching ratio has been determined to be Br(τ→π −π 0vτ=(22.6±0.9)%).
Abstract: An analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring. The branching ratio has been determined to be Br(τ-→π-π0vτ=(22.6±0.4±0.9)%. The shape of the π-π0 invariant mass spectrum is found to be in good agreement with the predictions obtained using the conserved vector current (CVC) hypothesis, suggesting that the π-π0 system is produced in aJP=1− state. An analysis of the measured decay angular distribution of the pions with respect to the flight direction of the π-π0 system demonstrates the vector nature of the coupling at the τvτ vertex. With the assumption of zerovτ mass thevτ spin has been shown to be\(J_{v_\tau } = \tfrac{1}{2} \).
TL;DR: In this article, an analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring, and the branching ratio has been determined to be Br(τ→π −π 0vτ=(22.6±0.4± 0.9)%).
Abstract: An analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring. The branching ratio has been determined to be Br(τ-→π-π0vτ=(22.6±0.4±0.9)%. The shape of the π-π0 invariant mass spectrum is found to be in good agreement with the predictions obtained using the conserved vector current (CVC) hypothesis, suggesting that the π-π0 system is produced in aJP=1− state. An analysis of the measured decay angular distribution of the pions with respect to the flight direction of the π-π0 system demonstrates the vector nature of the coupling at the τvτ vertex. With the assumption of zerovτ mass thevτ spin has been shown to be\(J_{v_\tau}= \tfrac{1}{2} \).
TL;DR: In this paper, the authors obtained upper limits of BRdir (ϒ (1S)→D*(2010)±+X) 02 and BRdir(ϒ(1S),→J/ψ +X)<068×10−3 at the 90% confidence level.
Abstract: The production ofD*(2010)+ andJ/ψ mesons and prompt leptons has been investigated ine+e− interactions at the Ψ(1S) resonance energy The data were collected at the storage ring DORIS II at DESY with the ARGUS detector We obtain upper limits of BRdir (ϒ (1S)→D*(2010)±+X) 02) and BRdir (ϒ(1S)→J/ψ+X)<068×10−3, both at the 90% confidence level From the prompt lepton analysis, a model dependent limit of BRdir (ϒ(1S)→Yc+X)<0034 (Yc denoting a charm-containing particle) is derived
TL;DR: In this paper, the ARGUS detector at the storage ring DORIS II at DESY was used to detect decays in the decay channel, and the branching ratios were determined to be 1.0±0.4 and 1.2± 0.2.
Abstract: Using the ARGUS detector at thee
+
e
− storage ring DORIS II at DESY, we have observed the decaysD
+→K
−
K
0π+π+ andD
+
→K
−
K
0π+π+. The branching ratios were determined to be BR(D
+→K
−
K
0π+π+)=(1.0±0.5±0.3)% and BR(D
+
→K
−
K
0π+π+)/BR(D
+
→φπ+)=1.2±0.2±0.2. These decays are found to proceed mostly via the
$$\bar K*^0 K*^ + $$
decay channel, with BR(D
+→
$$\bar K*^0 K*^ + $$
)=2.6±0.8±0.7)% and BR(D
+
→
$$\bar K*^0 K*^ + $$
)/BR(D
+
→φπ+)=1.5±0.4±0.4.
01 Dec 1992