18,115,675 research outputs found
Quarkonia and heavy flavors at the LHC
Perspectives for quarkonia and heavy flavors measurements in heavy ion
collisions at LHC are reviewedComment: 6 pages, Proceedings of the Hard Probes 2004 Conference, Ericeira,
Portugal, Nov 2004, replaced with revised versio
Two-pion Bose-Einstein correlations in central Pb-Pb collisions at = 2.76 TeV
The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb
collisions at TeV at the Large Hadron Collider is
presented. We observe a growing trend with energy now not only for the
longitudinal and the outward but also for the sideward pion source radius. The
pion homogeneity volume and the decoupling time are significantly larger than
those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/388
Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at TeV
Inclusive transverse momentum spectra of primary charged particles in Pb-Pb
collisions at = 2.76 TeV have been measured by the ALICE
Collaboration at the LHC. The data are presented for central and peripheral
collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross
section. The measured charged particle spectra in and GeV/ are compared to the expectation in pp collisions at the same
, scaled by the number of underlying nucleon-nucleon
collisions. The comparison is expressed in terms of the nuclear modification
factor . The result indicates only weak medium effects ( 0.7) in peripheral collisions. In central collisions,
reaches a minimum of about 0.14 at -7GeV/ and increases
significantly at larger . The measured suppression of high- particles is stronger than that observed at lower collision energies,
indicating that a very dense medium is formed in central Pb-Pb collisions at
the LHC.Comment: 15 pages, 5 captioned figures, 3 tables, authors from page 10,
published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/98
Nuclear Effects in Deep Inelastic Scattering of Charged-Current Neutrino off Nuclear
Nuclear effect in the neutrino-nucleus charged-Current inelastic scattering
process is studied by analyzing the CCFR and NuTeV data. Structure functions
and as well as differential cross sections are
calculated by using CTEQ parton distribution functions and EKRS and HKN nuclear
parton distribution functions, and compared with the CCFR and NuTeV data. It is
found that the corrections of nuclear effect to the differential cross section
for the charged-current anti-neutrino scattering on nucleus are negligible, the
EMC effect exists in the neutrino structure function in the large
region, the shadowing and anti-shadowing effect occurs in the distribution
functions of valence quarks in the small and medium region,respectively. It
is also found that shadowing effects on in the small region in
the neutrino-nucleus and the charged-lepton-nucleus deep inelastic scattering
processes are different. It is clear that the neutrino-nucleus deep inelastic
scattering data should further be employed in restricting nuclear parton
distributions.Comment: 24 pages, 5 figure
Experiments on Chute Flows of Granular Materials
Experiments on continuous, steady flows of granular materials down an inclined channel or chute were made with the object of acquiring information on the rheological properties of the granular material flow and the nature of the boundary condition on the base of the channel. Specifically measurements were made of the mean material velocities and velocity profiles on all boundaries of the flow using cross-correlation of two neighboring fibre-optic displacement probes. The output from these probes was used to obtain (1) the unsteady or random component of the particle velocity in the longitudinal direction and (2) a measure of the volume fraction of the flow in contact with the base by counting the frequency of passage of the particles. Measurement was also made of the depth of the flow, the mass flow rate and the shear stress on the base. The latter employed a strain-gauged shear force plate built into the base.
The experiments are currently in progress and so further data will be presented at a later date. Nevertheless the preliminary data have yielded a number of interesting features
Book publishing and book selling in Vietnam
This article will begin with a brief introduction to Vietnam and will glance at the historical background to writing and publishing in the country. It will then examine the state of book publishing in contemporary Vietnam and suggest some of the opportunities and challenges facing anyone wanting to acquire Vietnamese books
What do people do with porn? qualitative research into the consumption, use and experience of pornography and other sexually explicit media
This article reviews qualitative research into the consumption of pornography and other sexually explicit media emerging from a range of subject areas. Taking a critique of quantitative methods and a focus on measuring sexual effects and attitudes as a starting point, it considers the proposition that qualitative work is more suited to an examination of the complex social, cultural and political constructions of sexuality. Examining studies into the way men, women and young people see, experience, and use explicit media texts, the article identifies the key findings that have emerged. Qualitative work shows that sexuality explicit media texts are experienced and understood in a variety of ways and evoke strong and often contradictory reactions, not all of which are represented in public debates about pornography. These texts function in a range of different ways, depending on context; as a source of knowledge, a resource for intimate practices, a site for identity construction, and an occasion for performing gender and sexuality. The article reviews these studies and their findings, identifying what they suggest about directions for future research, both in terms of developing methodology and refining approaches to sexuality and media consumption.</p
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