222 research outputs found
RAZVOJ PRVIN NA DROGU GLEDE NA JAPONSKE VIRE
No full textMore recently a total of 800 elements have been recorded in the Gymnastics Code of Points. However few of theses elements made gymnastics history. As such we wonder by whom, when or where these various elements are performed. The purpose of this study was to collate data elements on the Horizontal Bar (HB) in men’s artistic gymnastics and to suggest new elements in the future. The method of study was undertaken by bibliographic analysis. This article refers mainly to journals that were published by the Japan Gymnastic Association, and a list that was made regarding the occurrence of new elements on HB in Men’s artistic gymnastics. From the analysis, the author gatherd data regarding various elememts that were performed. For example, Swing forward and vault backward straddle to hang (Tkatchev) was performed by Tkatchev A. in the 1979 World cup. A Tkatchev stretch was performed by Liukin V. and Nishikawa D. in the 1988 Seoul Olympics. In conclusion, developments of HB elements are greatly influenced by the improvement of apparatus, rules of the era. In the near future, directions of new occurring elements on the HB may add twists to the existing elements.V današnjem pravilniku FIG za ocenjevanje v moški orodni telovadbi je okoli 800 prvin. Za malo teh prvin se natančno ve, kdaj so bile prvič izvedene, kdo jih je prvič izvedel in kje jih je izvedel. Namen članka je bil raziskati pojavnost prvin na drogu z namenom predvideti nove prvine. Uporabljena je bila bibliografska metoda. V članku so predvsem uporabljeni japonski viri, izdani s strani Japonske telovadne zveze in narejen je bil seznam glede na čas pojavitve posamezne nove prvine. Upoštevane so bile različne izvedbe posameznih prvin, npr. Tkačev je izvedel iz predkoleba skok nazaj raznožno v ponovni prijem leta 1979 na svetovnem pokala. Prvič sta stegnjenega Tkačeva izvedla Ljukin in Nišikava na olimpijskih igrah leta 1988 v Seulu. Napredek na drogu so omogočili predvsem razvoj orodja in razvoj prvin. V prihodnosti lahko predvsem pričakujemo prvine z dodanimi obrati
A study of intermittency in Hadronic Z Decays
No full textA study on the modifications of the relation between author and lector due to the translation from text to hypertex
Search for single top quark production via contact interactions at LEP2
No full textSingle top quark production via four-fermion contact interactions associated to flavour-changing neutral currents was searched for in data taken by the DELPHI detector at LEP2. The data were accumulated at centre-ofmass energies ranging from 189 to 209 GeV, with an integrated luminosity of 598.1 pb−1. No evidence for a signal was found. Limits on the energy scale Λ, were set for scalar-, vector- and tensor-like coupling scenarios. © The Author(s) 2011
Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays
No full textAn analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones. © 2010 The Author(s)
A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole
No full textThe nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementarymethods are used to reconstruct the energy of weakly decaying b-hadrons, EweakB. The average value of xweakB = EweakB/Ebeam is measured to be 0.699 ± 0.011. The resulting xweakB distribution is then analysed in the framework of two choices for the perturbative contribution (parton shower and Next to Leading Log QCD calculation) in order to extract measurements of the non-perturbative contribution to be used in studies of bhadron production in other experimental environments than LEP. In the parton shower framework, data favour the Lund model ansatz and corresponding values of its parameters have been determined within PYTHIA 6.156 from DELPHI data: a=1.84+0.23-0.21 and b=0.642+0.073-0.063 GeV-2, with a correlation factor ρ=92.2%. Combining the data on the b-quark fragmentation distributions with those obtained at the Z peak by ALEPH, OPAL and SLD, the average value of xweakB is found to be 0.7092 ± 0.0025 and the non-perturbative fragmentation component is extracted. Using the combined distribution, a better determination of the Lund parameters is also obtained: a = 1.48+0.11-0.10 and b = 0.509+0.024-0.023 GeV-2, with a correlation factor ρ 92.6%. © The Author(s) 2011
Searches for invisibly decaying Higgs bosons with the DELPHI detector at LEP
No full textGeneral rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 29 Jun 2019 Digital Object Identifier (DOI) 10.1140/epjc/s2003-01469-8 Eur. Phys. J. C 32, 475-492 (2004) Abstract. Searches for HZ production with the Higgs boson decaying into an invisible final state were performed using the data collected by the DELPHI experiment at centre-of-mass energies between 188 GeV and 209 GeV. Both hadronic and leptonic final states of the Z boson were analysed. In addition to the search for a heavy Higgs boson, a dedicated search for a light Higgs boson down to 40 GeV/c 2 was performed. No signal was found. Assuming the Standard Model HZ production cross-section, the mass limit for invisibly decaying Higgs bosons is 112.1 GeV/c 2 at 95% confidence level. An interpretation in the Minimal Supersymmetric extension of the Standard Model (MSSM) and in a Majoron model is also given
Kaon interference in the hadronic decays of the Z
No full textLink to publication Citation for published version (APA): Abreu, P., Agasi, E. E., Boudinov, E., Hao, W., Holthuizen, D. J., Kluit, P. M., ... van Eldik, J. E. (1996). Kaon interference in the hadronic decays of the Z. Physics Letters B, 379, 330. https://doi.org/10.1016/0370-2693(96)00572-2 General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. EB ELSEWJER PHYSICS LETTERS B Physics Letters B 379 (1996) [330][331][332][333][334][335][336][337][338][339][340] Kaon interference in the hadronic decays of the Z" Abstract The first measurement of like-sign charged kaon correlations in hadronic decays of the p is presented, based on data collected by the DELPHI detector. The charged kaons are identified by means of ring imaging Cherenkov detectors. A significant enhancement at small values of the four:momentum difference is observed in the ratio of like-sign to unlikesign KK pairs and in the ratio of like-sign pairs to a simulated reference sample. An update of the measurement of KiK:!, interference is also presented. An enhancement is found in the production of pairs of Ki of similar momenta, as compared with a simulated reference sample. The measured Bose-Einstein correlation parameters A and r are similar for charged and neutral kaon pairs. The value of the Bose-Einstein correlation strength A is consistent with unity. ' On leave of absence from IHEP Serpukhov
Exclusive rho(0) muoproduction on transversely polarised protons and deuterons
No full textAdolph C, Alekseev MG, Alexakhin VY, et al. Exclusive rho(0) muoproduction on transversely polarised protons and deuterons. Nuclear Physics B. 2012;865(1):1-20.The transverse target spin azimuthal asymmetry A(UT)(sin(phi-phi s)) in hard exclusive production of rho(0) mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E-q, which are related to the orbital angular momentum of quarks in the nucleon. The Q(2), x-B-j and p(T)(2) dependence of A(UT)(sin(phi-phi s)) is presented in a wide kinematic range: 1 (GeV/c)(2) < Q(2) < 10 (GeV/c)(2), 0.003 < xB(j) < 0.3 and 0.05 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2) for protons or 0.10 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2) for deuterons. Results for deuterons are obtained for the first time. The measured asymmetry is small in the whole kinematic range for both protons and deuterons, which is consistent with the theoretical interpretation that contributions from GPDs E-u and E-d approximately cancel. (C) 2012 Elsevier B.V. All rights reserved
Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering
No full textAlekseev MG, Alexakhin VY, Alexandrov Y, et al. Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering. Phys.Lett. B. 2010;693(3):227-235.Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH_3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, \Delta u-bar - \Delta d-bar, is found to be slightly positive, about 1.5 standard deviations away from zero
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