共查询到20条相似文献,搜索用时 15 毫秒
1.
P. Crochet 《Pramana》2003,60(5):1051-1054
The physics capabilitites of the ALICE forward muon spectrometer are reviewed. 相似文献
2.
Z. Conesa del Valle 《The European Physical Journal C - Particles and Fields》2007,49(1):149-154
The ALICE capabilities for W and Z detection at LHC are discussed. The contributions to single muon transverse momentum distribution
are evaluated. The expected performance of the muon spectrometer for detecting W and Z bosons via their muonic decay is presented.
Possible application for the study of in-medium effects in ultrarelativistic heavy ion collisions is discussed. 相似文献
3.
N. Bastid 《Physics of Atomic Nuclei》2008,71(9):1505-1513
ALICE, the dedicated heavy-ion experiment at the LHC, has also an important proton-proton physics program. The ALICE muon
spectrometer will be presented and the corresponding physics analysis will be reviewed. A particular emphasis will be placed
on heavy-flavor measurement.
(for the ALICE Collaboration)
The text was submitted by the author in English. 相似文献
4.
J. C. Hill 《Czechoslovak Journal of Physics》2005,55(12):1655-1658
The PHENIX forward upgrade adds nosecone calorimeters and level-1 trigger (LVL-1) detectors to the muon forward spectrometers.
The muon detector will trigger on high pT muons from W decay and reject background. This will enable study of quark and anti-quark polarizations in the proton. The
upgrade will add momentum and timing information to the present muon trigger. Signals from 3 Resistive Plate Chambers (RPCs)
will provide momentum and timing information for the LVL-1 trigger. Each RPC carries a plane with coarse structure to establish
a space point for timing and one with radial cathode strips for azimuthal resolution. Timing resolution of ≈ 2 ns rejects
beam-related backgrounds and tracking from RPCs minimizes muons from hadron decays. RPC information is sent by optical. bers
to LVL-1 trigger processors. A discussion of physics measurements possible, layout of the upgrade and details of RPC design
and tests are given below.
for the PHENIX collaboration
Presented in the Poster Session “Future Experiments and Facilities” at the 18th International Conference “Quark Matter 2005”,
Budapest, Hungary, 4–9 August 2005. 相似文献
5.
E. Scomparin 《Indian Journal of Physics》2011,85(6):935-940
The study of quarkonium polarization at hadron colliders represents an important test of the production models. Recent results,
obtained at CDF, are in striking disagreement with NRQCD predictions, although such a model correctly reproduces the production
cross sections. Furthermore, in nucleus-nucleus collisions, the observed degree of polarization may be related to the characteristics
of deconfined matter. Because of these interesting features, quarkonium polarization will surely represent an interesting
observable at LHC energies. In ALICE, the polarization of the Ω and Γ states can be measured in the dilepton channel, both in the central barrel and in the forward (2.5<y<4) muon arm. We present
the results of a feasibility study, relative to the muon channel, concerning p-p and Pb-Pb collisions, showing the expected
performance for the measurement of J/Ω and Γ polarization, both as a function of transverse momentum and centrality. 相似文献
6.
We report on the development of a spectrometer for Muon Spin Rotation based on multiwire proportional chambers. The coordinates provided by telescopes each composed of two chambers are used to reconstruct the muon and the positron trajectories in
+
e++ve+
decay. A real-time analysis program verifies that the two tracks intersect within the target: this constitutes a very stringent test to veto events which do not correspond to a muon decay. The results of some experiments are given in order to illustrate the field of application of this spectrometer. 相似文献
7.
R. Vernet 《Physics of Atomic Nuclei》2008,71(9):1523-1534
The study of strangeness production at LHC will bring significant information on the bulk chemical properties, its dynamics,
and the hadronization mechanisms involved at these energies. The ALICE experiment will measure strange particles from topology
(secondary vertices) and from resonance decays over a wide range in transverse momentum and shed light on this new QCD regime.
These motivations will be presented as well as the identification performance of ALICE for strange hadrons.
(for the ALICE Collaboration)
The text was submitted by the author in English. 相似文献
8.
The efficiency for the detection and identification of photons with the ALICE PHOton Spectrometer PHOS has been studied with the Monte-Carlo generated data. In particular, the influence on the efficiency of the PHOS-module edge-effect and of the material in front of PHOS have been examined. 相似文献
9.
The efficiency for the detection and identification of photons with the ALICE PHOton Spectrometer PHOS has been studied with the Monte-Carlo generated data. In particular, the influence on the efficiency of the PHOS-module edge-effect and of the material in front of PHOS have been examined. 相似文献
10.
F. Giordano 《Physics of Particles and Nuclei》2014,45(1):320-322
In the last decade PHENIX has accessed via longitudinal double spin asymmetries the gluon helicity inside the proton, started probing flavor dependent valence and sea quark helicity distributions and started to explore the proton transverse spin structure. A major upgrade is planned for the next decade that will provide an increased acceptance and additional tracking and electromagnetic plus hadronic calorimetry in the forward region. Here, the layout of the new forward detector system will be discussed, together with the new insights in the proton spin structure that the new forward PHENIX spectrometer will provide. 相似文献
11.
J. Cvach V. I. Ilyushchenko I. A. Savin S. B. Vorozhtsov 《Czechoslovak Journal of Physics》1981,31(7):709-718
Conclusions The calculations of magnetic field in the NA4 spectrometer provided the magnetic field map for the reconstruction program. The field in iron is toroidal and decreases approximately logarithmically from 2·11 T at the inner edge to 1·77 T at the outer edge. The support of the magnet introduces a small disturbance at a level of 2% in the lower part of the magnet. A flow of the field through the support introduces a normal component of field in a narrow sector around the support leg. The multipole field in the hole has been neglected in the reconstruction program presently used.Dedicated to the 25th anniversary of the Joint Institute for Nuclear Research.On leave of absence fromInstitute of Physics, Czechosl. Acad. Sci., Prague, Czechoslovakia. 相似文献
12.
K. Nishiyama T. Azuma K. Ishida T. Matsuzaki J. Imazato T. Yamazaki K. Nagamine 《Hyperfine Interactions》1986,32(1-4):887-892
The 500 MHz muon resonance was newly developed. The system was constructed with 500MHz resonance cavity, pulsed high power
RF-source and the superconducting helmholz coil. This system provide the oppotunity to achieve the diamagnetic muon spectroscopy
at 37KG and 500MHz. Also muonic radical resonance and muonium resonance at magnetic field corresponding to the 500MHz resonance
frequency. Some preliminary but important result was also reported. 相似文献
13.
M. Lunardon 《The European Physical Journal C - Particles and Fields》2007,49(1):163-167
We present a strategy for the detection of electrons coming from the semi-electronic decay of beauty particles generated in
Pb–Pb and p–p collisions at LHC using the ALICE detector. The experiment’s performance for this measurement is evaluated in
terms of accessible pt range and expected uncertainties.
PACS 25.75.-q, 12.38.Mh, 13.20.He 相似文献
14.
15.
Based on cosmic ray events without a magnetic field taken with the BESIII detector during the summer shutdown of BEPCII in 2012 and di-muon events from a data sample taken at center-of-mass energy of 3.686 GeV in 2009, we compare the coordinates of hits registered in the BESIII muon counter with the expected interaction point extrapolated from reconstructed tracks from the inner tracking system in the absence of a magnetic field. By minimizing the difference, we align the muon counter with the inner tracking system. Moreover, the strength of the magnetic field in the muon counter is measured for the first time with di-muon events from data taken at a center-of-mass energy of 3.686 GeV. After the alignment and the magnetic field strength measurement, the offsets in the reconstructed hit positions for muon tracks are reduced, which improves the muon identification. The alignment and magnetic field strength measurement have been adopted in the latest version of the BESIII offline software system. This addition to the software reduces the systematic uncertainty for the physics analysis in cases where the muon counter information is used. 相似文献
16.
Brown HN Bunce G Carey RM Cushman P Danby GT Debevec PT Deile M Deng H Deninger W Dhawan SK Druzhinin VP Duong L Efstathiadis E Farley FJ Fedotovich GV Giron S Gray F Grigoriev D Grosse-Perdekamp M Grossmann A Hare MF Hertzog DW Hughes VW Iwasaki M Jungmann K Kawall D Kawamura M Khazin BI Kindem J Krienen F Kronkvist I Larsen R Lee YY Logashenko I McNabb R Meng W Mi J Miller JP Morse WM Nikas D Onderwater CJ Orlov Y Ozben CS Paley JM Polly C Pretz J Prigl R zu Putlitz G Redin SI Rind O 《Physical review letters》2001,86(11):2227-2231
A precise measurement of the anomalous g value, a(mu) = (g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a(mu+) = 11 659 202(14) (6) x 10(-10) (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a(mu)(SM) = 11 659 159.6(6.7) x 10(-10) (0.57 ppm) and a(mu)(exp) - a(mu)(SM) = 43(16) x 10(-10) in which a(mu)(exp) is the world average experimental value. 相似文献
17.
We point out that the component of the nucleon wave function is vital to the interpretation of the recent H1 data for leading baryon production.
While the n/p ratio is equal to two with the component alone, the inclusion of the component brings this ratio very near to unity, as observed in the experiment. This result demonstrates that pion exchange
can not only account for leading neutron but also for a large fraction of the leading proton production.
Received: 4 December 1998 / Revised version: 1 February 1999 / Published online: 27 April 1999 相似文献
18.
19.
20.
P. Abreu S. Andringa P. Assis A. Blanco V. Barbosa Martins P. Brogueira N. Carolino L. Cazon M. Cerda G. Cernicchiaro R. Colalillo R. Conceição O. Cunha R. M. de Almeida V. de Souza F. Diogo C. Dobrigkeit J. Espadanal C. Espirito-Santo M. Ferreira P. Ferreira P. Fonte U. Giaccari P. Gonçalves F. Guarino O. C. Lippmann L. Lopes R. Luz D. Maurizio F. Marujo P. Mazur L. Mendes A. Pereira Mario Pimenta R. R. Prado J. R̆ídký R. Sarmento C. Scarso R. Shellard J. Souza B. Tomé P. Trávníc̆ek J. Vícha H. Wolters E. Zas 《The European Physical Journal C - Particles and Fields》2018,78(4):333
A new concept for the direct measurement of muons in air showers is presented. The concept is based on resistive plate chambers (RPCs), which can directly measure muons with very good space and time resolution. The muon detector is shielded by placing it under another detector able to absorb and measure the electromagnetic component of the showers such as a water-Cherenkov detector, commonly used in air shower arrays. The combination of the two detectors in a single, compact detector unit provides a unique measurement that opens rich possibilities in the study of air showers. 相似文献