Showing papers by "Hermann Kolanoski published in 1994"
TL;DR: In this paper, the H1 detector at HERA was used for a class of deep inelastic electron-proton scattering (DIS) events (5 < Q2 < 120 GeV2) at low Bjorken-x (10−4 < x < 10−2) which have almost no hadronic energy flow in a large interval of pseudo-rapidity around the proton remnant direction and which cannot be attributed to our present understanding of DIS and fluctuations in final state hadronic fragmentation.
139 citations
01 Jan 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, the energy calibration of the H1 liquid argon calorimeter modules with electrons from a test beam in the energy range of 3.7 GeV to 80 GeV is presented.
Abstract: Results are presented on the energy calibration of the H1 liquid argon calorimeter modules with electrons from a test beam in the energy range of 3.7 GeV to 80 GeV. The method to determine the calibration for the Hl experiment from these measurements by the use of detailed simulations is described . Various systematic checks of this calibration are given. The calorimeter response is uniform in space within ±1% and linear with energy within ±1%. An average energy resolution of about 11.5%/ E [GeV] is achieved .
87 citations
TL;DR: In this paper, the cross section of the charged current process e − p → v e + hadrons is measured at HERA for transverse momenta of the hadron system larger than 25 GeV.
50 citations
TL;DR: In this article, the exclusive decay B → J/ψK ∗ was measured using the ARGUS detector at the e+e− storage ring DORIS II and the ratio of the transverse to the total decay width was found to be ΓT/Γ = 0.03±0.15.
44 citations
TL;DR: In this paper, the authors used the ARGUS detector at the e + e − storage ring DORIS II at DESY to study the decay of B 0 → D ∗+ l − v by exploiting a partial reconstruction technique and determined the branching ratio for this mode was determined to be (4.5 ± 0.4)%.
41 citations
TL;DR: In this paper, a study of meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY, is presented.
39 citations
15 May 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, the performances of the H1 liquid argon calorimeter modules for the energy measurements and identification of electrons are studied with test data taken at CERN in the energy range 5 to 166 GeV.
Abstract: The performances of the H1 liquid argon calorimeter modules for the energy measurements and identification of electrons are studied with test data taken at CERN in the energy range 5 to 166 GeV. Various electron identification estimators exploiting global or detailed shower characteristics are studied and compared. The usage of impact position measurements is also discussed. A best combination of robust shower estimators leads typically to π-misidentification probabilities in the range 1.5 to 5.0 × 10−3 at 30 GeV for 95% electron detection efficiency. This further reduces to ∼ 10−4 for these pions to be misidentified as electrons below 25 GeV.
29 citations
TL;DR: In this article, scaling violations of the proton structure function F 2 ( x, Q 2 ) measured with the H1 detector at HERA in the range of Bjorken x values between x = 3 × 10 −4 and 10 −2 for four-momentum transfers Q > 2 larger than 8.7 GeV 2.
26 citations
TL;DR: In this article, cross sections for the production of charged particles measured in electron-proton collisions at low Q 2 with the H1 detector at HERA were presented for the inclusive production of particles.
26 citations
TL;DR: In this article, global properties of the hadronic final state in deep inelastic scattering events at HERA are investigated and the data are corrected for detector effects and are compared directly with QCD phenomenology.
Abstract: Global properties of the hadronic final state in deep inelastic scattering events at HERA are investigated. The data are corrected for detector effects and are compared directly with QCD phenomenology. Energy flows in both the laboratory frame and the hadronic centre of mass system and energy-energy correlations in the laboratory frame are presented. Comparing various QCD models, the colour dipole model provides the only satisfactory description of the data. In the hadronic centre of mass system the momentum components of charged particles longitudinal and transverse to the virtual boson direction are measured and compared with lower energy lepton-nucleon scattering data as well as withe+e− dat from LEP.
25 citations
TL;DR: In this article, the ARGUS detector has been used to study the production of quark and gluonic Υ(1S) decays and ϕ meson and baryon fragmentation.
Abstract: The production ofK
*+(892),K
*0(892),ρ
0(770) andω(783) vector mesons inρ
0(770) events as well as in the gluonic Υ(1S) decays andρ
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 ons quark and vector meson suppression (s/u=0.37±0.04,V/(V+P)
π=0.21±0.04 andV/(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.
TL;DR: A search for direct production of new leptons in the mass range from 10 GeV up to 225 GeV is presented by the H1 experiment at HERA in this article.
15 Oct 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, the properties of four PbF2 crystals of size 21 × 21 × 175 mm3 were studied with electron and pion beams in the energy range from 1 to 6 GeV.
Abstract: The properties of four PbF2 crystals of size 21 × 21 × 175 mm3 were studied with electron and pion beams in the energy range from 1 to 6 GeV An energy resolution for electrons of 63%/√E/GeV was achieved with a 2 × 2 matrix of four PbF2 crystals, which corresponds to 56%/√E/GeV when corrected for lateral leakage by Monte Carlo simulations The deviation from linearity was smaller than 05% The time resolution was found to be better than 06 ns We studied also optical properties, radiation hardness, position resolution and spatial homogeneity An efficient separation of electromagnetic and hadronic showers was achieved
TL;DR: In this paper, a search in the H1 experiment at HERA for scalar and vector leptoquarks, leptogluons and squarks coupling to first generation fermions is presented in a data sample corresponding to an integrated luminosity of 425 nb−1.
Abstract: A search in the H1 experiment at HERA for scalar and vector leptoquarks, leptogluons and squarks coupling to first generation fermions is presented in a data sample corresponding to an integrated luminosity of 425 nb−1. For masses ranging up to ∼275 GeV, no significant evidence for the direct production of such particles is found in various possible decay channels. At high masses and beyond the centre of mass energy of 296 GeV a contact interaction analysis is used to further constrain the couplings and masses of new vector leptoquarks and to set lower limits on compositeness scales.
TL;DR: In this article, the authors used the ARGUS detector at the DORIS II storage ring to investigate the Lorentz structure of the electroweak interaction in semi-hadronic τ decays.
TL;DR: In this article, the JADE jet clustering algorithm was used to determine the jet rates for momentum transfer squared up to 500 GeV2 using the H1 detector at HERA.
Abstract: Multi-jet production is observed in deep-inelastic electron proton scattering with the H1 detector at HERA. Jet rates for momentum transfers squared up to 500 GeV2 are determined using the JADE jet clustering algorithm. They are found to be in agreement with predictions from QCD based models.
TL;DR: In this paper, an analysis of the reaction yy ~ r/c was l~erformed in five different decay channels of the R/c: /~sK+~r ~, K+K-Tr+~ "-, 27r+21r -, ~b~b and 2K+2K -.
TL;DR: Using the ARGUS detector at the e+ e− storage ring DORIS II, this article measured the absolute branching ratios of the D0 meson, Br(D0→K− π+)=(3.41±0.28)%, Br(d0→k−π�+ π+π+π+ ))=(6.80± 0.57)%, and Br (D 0 → K 0 π + π − )=(5.03±
TL;DR: In this article, the ARGUS detector at DORIS II was used to study Cabibbo-suppressed D0 decay modes resulting in the K+K−π+π− final state and two-body D0 modes with a ϕ meson in the final state.
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied Cabibbo-suppressedD0 decay modes resulting in theK+K−π+π− final state and two-bodyD0 decay modes with a ϕ meson in the final state. TheBR(D0→KS0KS0π+π− was measured for the first time. We also present a measurement of theD+→KS0KS0K+ branching ratio. The values are compared with other experimental results and model predictions.
TL;DR: In this article, the ARGUS detector at the e + e − storage ring DORIS II at DESY has been used to study two-photon production of the hadronic final states K + K − π + π − and K + γγ → oϱ 0.
TL;DR: Using the ARGUS detector at DORIS II, flavour-dependent kaon production in B meson decays has been studied as discussed by the authors using the leptons as flavour tags, and it has been possible to separately measure the multiplicities of K+,K− and Ks0 in inclusiveB decays and in semileptonic B decays.
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− andKs0 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.
01 Dec 1994
TL;DR: In this paper, the polarization of the Λ daughter baryon from Λc+ → Λl+ vl decay has been measured for the first time using the ARGUS detector at the DORIS II ϵ+ϵ− storage ring.
31 Dec 1994
TL;DR: In this article, feed-forward networks, trained on the topological energy sums from the H1 calorimeter and on first level tracking trigger information, provide an additional background suppression factor.
Abstract: At the HERA e-p collider the expected machine background rates are 10{sup 5} times higher than the rates from physics. The greatest challenge in the trigger is finding methods which suppress the machine background without using lengthy pattern recognition algorithms. The authors present investigations show that feed-forward networks, trained on the topological energy sums from the H1 calorimeter and on first level tracking trigger information, provide an additional background suppression factor.
TL;DR: In this paper, a partial reconstruction of the decay channel B − → D j (∗) π − performed using the ARGUS detector operating at the e+e− storage-ring DORIS II is presented.