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Journal articleDAS I, SAMPATHKUMARAN EV, 1995,
MAGNETORESISTANCE BEHAVIOR OF TERNARY CE ALLOYS
, PHYSICAL REVIEW B, Vol: 51, Pages: 1308-1310, ISSN: 0163-1829- Author Web Link
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- Citations: 11
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Journal articleAlbajar C, Andlinger M, Arefiev A, et al., 1995,
Measurement of hadronic shower punchthrough in magnetic field
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 415-425, ISSN: 0170-9739The total punchthrough probability of showers produced by negative pions, positive pions, positive kaons and protons, has been measured as a function of depth in an absorber in a magnetic field ranging from 0 to 3 Tesla. The incident particle momentum varied from 10 to 300 GeV/c. The lateral shower development and particle multiplicity at several absorber depths have been determined. The measurements are compared with the predictions of Monte Carlo simulation programs. © 1996 Springer-Verlag.
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Conference paperFolkner WM, Hellings RW, Maleki L, et al., 1995,
LISA: Laser Interferometer Space Antenna for gravitational wave measurements
The capability of observing gravitational radiation over a wide range of frequencies will open up major new opportunities in fundamental physics and astronomy. The Laser Interferometer Space Antenna (LISA) will be able to detect gravitational radiation over the frequency range from 0.1 mHz to 0.1 Hz with high sensitivity. Signals from hundreds to thousands of galactic binaries will be detectable. In addition, the coalescence of massive black hole binaries, which may have been produced by mergers of galaxies or of pregalactic structures, would be observable out to large redshifts. Such signals would allow the study of the interactions of large masses at small distances, which would not be possible in any other manner. LISA was proposed initially by a group of European and US scientists as a possible joint ESA/NASA mission, but has been studied recently as a candidate for a predominantly European mission. The results of the study indicated that the technology for the mission is available or will soon be available. The main part of the study team report given here summarizes the scientific objectives and the mission concept.
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Journal articleMiller T, Beaman J, Evenson PA, et al., 1995,
Initial analysis of coincident events between the SPASE and AMANDA detectors
, Nuclear Physics B (Proceedings Supplements), Vol: 43, Pages: 245-248, ISSN: 0920-5632We report on the status of the SPASE-AMANDA coincidence experiment. © 1995 Elsevier Science B.V. All rights reserved.
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Journal articleAskebjer P, Barwick SW, Bergström L, et al., 1995,
AMANDA: status report from the 1993-94 campaign and optical properties of the South Pole ice
, Nuclear Physics B (Proceedings Supplements), Vol: 38, Pages: 287-292, ISSN: 0920-5632We report the first results of the AMANDA detector. During the antarctic summer 1993-94 four strings were deployed between 0.8 an 1 km depth, each equipped with 20 photomultiplier tubes (PMTs). A laser source was used to investigate the optical properties of the ice in situ. We find that the ice is intrinsically extremely transparent. The measured absorption length is 59 ± 3 m, i.e. comparable with the quality of the ultra-pure water used in the IMB and Kamiokande proton-decay and neutrino experiments [1,2] and more than two times longer than the best value reported for laboratory ice [3]. Due to a residual density of air bubbles at these depths, the motion of photons in the medium is randomized. For spherical, smooth bubbles we find that, at 1 km depth, the average distance between collisions is about 25 cm. The measured inverse scattering length on bubbles decreases linearly with increasing depth in the volume of ice investigated. © 1995 Elsevier Science B.V. All rights reserved.
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Conference paperBaird A, Dowell J, Duthie P, et al., 1995,
Analog lightwave links for detector front-ends at the LHC
, Pages: 251-255Lightwave links are being developed for volume application in the transfer of analog signals from the tracking detector front-ends to the readout electronics. The links are based on electro-optic intensity modulators which are mounted on detectors and connected by optical fibers to remotely located transceivers (lasers and photoreceivers). The modulators are III-V semiconductor reflective devices based on multi-quantum well structures. The transceivers will be integrated devices of a novel design. Modulator prototypes have been fabricated and tested. Neutron and γ-ray irradiation studies have been performed on modulators and fibers. The main results achieved so far are reported. This work is part of the CERN DRDC project RD23 [1].
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Journal articleBuskulic D, Casper D, De Bonis I, et al., 1995,
Measurements of the charged particle multiplicity distribution in restricted rapidity intervals
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 15-25, ISSN: 0170-9739Charged particle multiplicity distributions have been measured with the ALEPH detector in restricted rapidity intervals |Y| ≤0.5, 1.0, 1.5, 2.0 along the thrust axis and also without restriction on rapidity. The distribution for the full range can be parametrized by a log-normal distribution. For smaller windows one finds a more complicated structure, which is understood to arise from perturbative effects. The negative-binomial distribution fails to describe the data both with and without the restriction on rapidity. The JETSET model is found to describe all aspects of the data while the width predicted by HERWIG is in significant disagreement. © 1996 Springer-Verlag.
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Journal articleBuskulic D, Casper D, De Bonis I, et al., 1995,
Production of excited beauty states in Z decays
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 393-404, ISSN: 0170-9739A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227±140±252 B* mesons in the decay B*→Bγ and 1944±108±161 B** u,d mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B** u,d denotes the eight L=1(bū) and (bd) states and their charge conjugate. For the well established B* meson the following quantities are obtained:ΔM=M B*-MB=(45.30±0.35±0.87) MeV/c2 and N B*/(N B+N B*)=(77.1±2.6±7.0)%. The angular distribution of the photons in the B* rest frame is used to measure the relative contribution of longitudinal B* polarization states to be σ L/(σ L+σ T)=(33±6±5)%. In the M(Bπ)-M(B) mass difference resonance structure is observed at (424±4±10) MeV/c2, for which the shape and position is consistent with the expectation for B** u,d states decaying into B(*)π ±. The relative production rate is determined to be {Mathematical expression} where the third error reflects the uncertainty due to different production and decay models for the broad B** u,d states. © 1996 Springer-Verlag.
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Journal articleBuskulic D, Casper D, De Bonis I, et al., 1995,
First measurement of the quark-to-photon fragmentation function
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 365-377, ISSN: 0170-9739Earlier measurements at LEP of isolated hard photons in hadronic Z decays, attributed to radiation from primary quark pairs, have been extended in the ALEPH experiment to include hard photon production inside hadron jets. Events are selected where all particles combine democratically to form hadron jets, one of which contains a photon with a fractional energy z≥0.7. After statistical subtraction of non-prompt photons, the quark-to-photon fragmentation function, D(z), is extracted directly from the measured 2-jet rate. By taking into account the perturbative contributions to D(z) obtained from an O(ααs) QCD calculation, the unknown non-perturbative component of D(z) is then determined at high z. Provided due account is taken of hadronization effects near z=1, a good description of the other event topologies is then found. © 1996 Springer-Verlag.
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Journal articleBuskulic D, Casper D, De Bonis I, et al., 1995,
Inclusive production of neutral vector mesons in hadronic Z decays
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 379-392, ISSN: 0170-9739Data on the inclusive production of the neutral vector mesons ρ 0(770), ω(782), K*0(892), and φ(1020) in hadronic Z decays recorded with the ALEPH detector at LEP are presented and compared to Monte Carlo model predictions. Bose-Einstein effects are found to be important in extracting a reliable value for the ρ 0 production rate. An average ρ 0 multiplicity of 1.45±0.21 per event is obtained. The ω is detected via its three pion decay mode ω→π + π - π 0 and has a total rate of 1.07±0.14 per event. The multiplicity of the K*0 is 0.83±0.09, whilst that of the φ is 0.122±0.009, both measured using their charged decay modes. The measurements provide information on the relative production rates of vector and pseudoscalar mesons, as well as on the relative probabilities for the production of hadrons containing u, d, and s quarks. © 1996 Springer-Verlag.
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Journal articleBuskulic D, Casper D, De Bonis I, et al., 1995,
Measurement of D<inf> s</inf><sup> +</sup> meson production in Z decays and of the B<inf> s</inf><sup> 0</sup> lifetime
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 585-595, ISSN: 0170-9739D s + mesons produced in Z 0→bb events were separated from the Z 0→cc component using a lifetime tag. Using a sample of 1.5 million hadronic Z decays collected with the Aleph detector the B s 0 and D s + yields have been measured: {Mathematical expression} The B s 0 lifetime was measured in a B s 0 enriched sample reconstructing the decay length from the vertex of the D s + with a hadron from the B s 0 decay. The result obtained is: {Mathematical expression} ps. © 1996 Springer-Verlag.
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Conference paperCHEPEL VY, ARAUJO HM, LOPES MI, et al., 1995,
LOW-TEMPERATURE TEST OF PHOTOMULTIPLIER TUBES
, 6th International Symposium on Radiation Physics (ISRP-6), Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 495-496, ISSN: 0969-8043- Author Web Link
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- Citations: 1
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Journal articleBACCI C, BENCZE C, CARDARELLI R, et al., 1995,
TEST OF A RESISTIVE PLATE CHAMBER OPERATING WITH LOW GAS AMPLIFICATION AT HIGH-INTENSITY BEAMS
, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Vol: 352, Pages: 552-556, ISSN: 0168-9002- Author Web Link
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- Citations: 26
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Conference paperDavies G J, 1995,
RECENT RESULTS FROM UK DARK MATTER EXPERIMENTS IN THE BOULBY MINE
, European Physical Society, Pages: 397-398 -
Journal articleBuskulic D, Casper D, De Bonis I, et al., 1995,
Improved tau polarisation measurement
, Zeitschrift für Physik C: Particles and Fields, Vol: 69, Pages: 183-193, ISSN: 0170-9739Using 22 pb-1 of data collected at LEP in 1992 on the peak of the Z resonance, the ALEPH collaboration has measured the polarisation of the tau leptons decaying into {Mathematical expression}, πν, ρν and a1 ν from their individual decay product distributions. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters N τ and N e, where, in terms of the axial and vector couplings g Al and g Vl, N l=2 g Vl gAl/(g Vl 2 +g Al 2 ). This analysis follows to a large extent the methods devised for the 1990 and 1991 data but with improvements which bring a better understanding of the systematic uncertainties. Combining the 1992 measurements with our previously published results yields N τ=0.136±0.012±0.009 and N e=0.129±0.016±0.005. Assuming e-τ universality, the measurements imply an effective weak mixing angle of sin 2 θ W eff =0.2332±0.0014. © 1996 Springer-Verlag.
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Journal articleBUCHMAN S, QUINN T, KEISER GM, et al., 1995,
CHARGE MEASUREMENT AND CONTROL FOR THE GRAVITY-PROBE-B GYROSCOPES
, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 66, Pages: 120-129, ISSN: 0034-6748- Author Web Link
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- Citations: 54
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Journal articleSAMPATHKUMARAN EV, DAS I, HAYASHI A, et al., 1995,
LOW-TEMPERATURE LATTICE STRAIN IN PRNI2SI2
, SOLID STATE COMMUNICATIONS, Vol: 93, Pages: 123-125, ISSN: 0038-1098- Author Web Link
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- Citations: 2
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Journal articleRaymond M, Millmore M, Hall G, et al., 1995,
Radiation hard electronics for LHC
, Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, Vol: 360, Pages: 162-165, ISSN: 0168-9002 -
Journal articleChepel VY, Lopes MI, Araujo HM, et al., 1995,
Liquid xenon multiwire chamber for positron tomography
, Nucl. Instrum. Meth. Phys. Res. A, Vol: 367, Pages: 58-61 -
Conference paperQuenby JJ, Sumner TJ, Bewick A, et al., 1995,
NaI limits to cold Galactic dark matter interaction rates
, Urbino, 24th International Cosmic Ray Conference (XXIV ICRC), Publisher: Argalia Editore Delle Arti Grafiche Editoriali Srl, Pages: 874-877 -
Conference paperQuenby JJ, Sumner TJ, Bewick A, et al., 1995,
NaI limits to cold Galactic dark matter interaction rates
, Urbino, 24th international cosmic ray conference (xxiv icrc) AUG 28-SEP 08, 1995 ROME, ITALY, Publisher: Argalia Editore Delle Arti Grafiche Editoriali Srl, Pages: 874-877 -
Conference paperQuenby JJ, Sumner TJ, Bewick A, et al., 1995,
NaI limits to cold Galactic dark matter interaction rates
, Urbino, 24th international cosmic ray conference (xxiv icrc) AUG 28-SEP 08, 1995 ROME, ITALY, Publisher: Argalia Editore Delle Arti Grafiche Editoriali Srl, Pages: 874-877 -
Journal articleABREU P, ADAM W, ADYE T, et al., 1994,
J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z
, PHYSICS LETTERS B, Vol: 341, Pages: 109-122, ISSN: 0370-2693- Author Web Link
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- Citations: 33
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Journal articleRAYMOND M, HALL G, MILLMORE M, et al., 1994,
MEASUREMENTS OF TRANSISTORS AND SILICON MICROSTRIP DETECTOR READOUT CIRCUITS IN THE HARRIS AVLSIRA RAD-HARD CMOS PROCESS
, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Vol: 351, Pages: 449-459, ISSN: 0168-9002- Author Web Link
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- Citations: 10
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Conference paperDornan P, 1994,
Conference summary
, Pages: 248-252, ISSN: 0168-9002 -
Conference paperDAUNCEY PD, NAKADA T, PERROUD JP, 1994,
THE GAJET EXPERIMENT AT LHC
, 2nd International Workshop on B-Physics at Hadron Machines, Publisher: ELSEVIER SCIENCE BV, Pages: 147-160, ISSN: 0168-9002- Author Web Link
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- Citations: 7
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Journal articleDERRICK M, KRAKAUER D, MAGILL S, et al., 1994,
COMPARISON OF ENERGY FLOWS IN DEEP-INELASTIC SCATTERING EVENTS WITH AND WITHOUT A LARGE RAPIDITY GAP
, PHYSICS LETTERS B, Vol: 338, Pages: 483-496, ISSN: 0370-2693- Author Web Link
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- Citations: 48
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Journal articleDAS I, SAMPATHKUMARAN EV, 1994,
MAGNETIC-ORDERING IN CE2RHSI3
, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol: 137, Pages: L239-L242, ISSN: 0304-8853- Author Web Link
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- Citations: 34
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Journal articleBUSKULIC D, CASPER D, DEBONIS I, et al., 1994,
PRODUCTION OF K(0) AND LAMBDA IN HADRONIC Z-DECAYS
, ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, Vol: 64, Pages: 361-373, ISSN: 0170-9739- Author Web Link
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- Citations: 68
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Journal articleABREU P, ADAM W, ADYE T, et al., 1994,
MEASUREMENT OF TIME-DEPENDENT B-D(0) (B)OVER-BAR-D(0) MIXING
, PHYSICS LETTERS B, Vol: 338, Pages: 409-420, ISSN: 0370-2693- Author Web Link
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- Citations: 17
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