4,682 research outputs found
d-Au and p-p collisions at RHIC and the multichain Monte Carlo Dpmjet-III
In this paper we compare systematically the two-component Dual Parton Model
(DPM) event generator Dpmjet-III to d-Au and p-p data from RHIC. In this
process we are able to improve the model. The need for fusion of chains and a
recalibration of the model to obtain collision scaling in h-A and d-A
collisions was found already in previous comparisons. Here, comparing to
transverse momentum distributions of identified charged hadrons we find also
the need to modify the transverse momentum distributions in the decay of
hadronic strings, the basic building blocks of the model on soft hadronic
collisions.Comment: 8 pages, 13 figures, Based on a contribution to a workshop "QCD at
Cosmic Energies, Erice, Italie, Aug.29 to Sept.5 200
The Functional Transformation Buildings in The Old City Semarang Based on The Urban Sustainable-Conservation Concepts
Conservation and Sustainability are inspiring the region of the Old City in Semarang. As the meanings of both words, the aim of conservation and sustainability in this region is addressed to secure long-term harmony between man and nature, to achieve continuous enhancement in the environment, and to increase the quality of life for humans and other life forms. Several buildings in the Old City Semarang show sustainability in how they interacts with people and public activities. The buildings change into public facilities that serves people in daily public activities. The transformations of their functions are very closed to society.
This paper discusses cases on term how the buildings secure their conservation and sustainability by statistical methods and descriptive analyses. Respondents had been taken from customers who visited to the buildings. The results show that certain buildings have a better maintenance than others as public facilities. Moreover, the greater the interaction of buildings and public activities, the better the maintenances have been represented by the building
Partial wave analysis of J/psi to p pbar pi0
Using a sample of 58 million events collected with the BESII
detector at the BEPC, more than 100,000 events are
selected, and a detailed partial wave analysis is performed. The branching
fraction is determined to be . A long-sought `missing' , first observed in , is observed in this decay too, with mass and width of
MeV/c and MeV/c,
respectively. Its spin-parity favors . The masses, widths, and
spin-parities of other states are obtained as well.Comment: Add one author nam
High-energy emission from jet-cloud interactions in AGNs
Active galactic nuclei present continuum and line emission. The emission
lines are originated by gas located close to the central super-massive black
hole. Some of these lines are broad, and would be produced in a small region
called broad-line region. This region could be formed by clouds surrounding the
central black hole. In this work, we study the interaction of such clouds with
the base of the jets in active galactic nuclei, and we compute the produced
high-energy emission. We focus on sources with low luminosities in the inner
jet regions, to avoid strong gamma-ray absorption. We find that the resulting
high-energy radiation may be significant in Centaurus A. Also, this phenomenon
might be behind the variable gamma-ray emission detected in M87, if very large
dark clouds are present. The detection of jet-cloud interactions in active
galactic nuclei would give information on the properties of the jet base and
the very central regions.Comment: 6 pages, 3 figures. To appear in the proceeding of the conference:
"High Energy Phenomena in Relativistic Outflows (HEPRO) II", held in Buenos
Aires, Argentina, October 26-30 2009
and baryon production in Au+Au collisions at GeV
We report preliminary results on the centrality dependence of the
and production at mid-rapidity in GeV Au+Au
collisions from the STAR experiment. For the most central data the obtained
yields suggest a saturation of strangeness production per produced hadron. The
calculated inverse slope parameter may indicate an earlier freeze-out of these
particles.Comment: 4 pages, 3 figures, 1 table, Contribution to Quark Matter 2002,
Nantes, France, July 200
New experimental limit on Pauli Exclusion Principle violation by electrons (the VIP experiment)
The Pauli Exclusion Principle is one of the basic principles of modern
physics and is at the very basis of our understanding of matter: thus it is
fundamental importance to test the limits of its validity. Here we present the
VIP (Violation of the Pauli Exclusion Principle) experiment, where we search
for anomalous X-rays emitted by copper atoms in a conductor: any detection of
these anomalous X-rays would mark a Pauli-forbidden transition. ] VIP is
currently taking data at the Gran Sasso underground laboratories, and its
scientific goal is to improve by at least four orders of magnitude the previous
limit on the probability of Pauli violating transitions, bringing it into the
10**-29 - 10**-30 region. First experimental results, together with future
plans, are presented.Comment: To appear in proceedings of the XLVI International Winter Meeting on
Nuclear Physics, Bormio, Italy, January 20-26, 200
New experimental limit on Pauli Exclusion Principle violation by electrons (the VIP experiment)
The Pauli exclusion principle (PEP) represents one of the basic principles of
modern physics and, even if there are no compelling reasons to doubt its
validity, it still spurs a lively debate, because an intuitive, elementary
explanation is still missing, and because of its unique stand among the basic
symmetries of physics. A new limit on the probability that PEP is violated by
electrons was estabilished by the VIP (VIolation of the Pauli exclusion
principle) Collaboration, using the method of searching for PEP forbidden
atomic transitions in copper. The preliminary value, {1/2}\beta^{2} \textless
4.5\times 10^{-28}, represents an improvement of about two orders of magnitude
of the previous limit. The goal of VIP is to push this limit at the level of
.Comment: submitted to Journal of Physics: Conference Series, by the Institute
of Physic
Ultra High Energy Tau Neutrinos and Fluorescence Detectors: A Phenomenological Approach
We investigate the possibility of detecting ultra-high energy cosmic
tau-neutrinos by means of a process involving a double extensive air shower,
the so-called Double-Bang Phenomenon. In this process a primary tau-neutrino
interacts with an atmospheric quark creating a hadronic extensive air shower
that contains a tau which subsequently decays creating a second extensive air
shower. The number of these events strongly depends on the cross section and on
the flux of ultra-high energy tau-neutrinos arriving at the Earth's atmosphere.
We estimate the potential of optical detectors to observe Double-Bang events
induced by tau-neutrinos with energies of about 1 EeV whose detection may
confirm the maximal mixing observed in the atmospheric neutrinos also for
ultra-high energy neutrinos, and give information on the neutrino flux and
cross-section. For neutrino-nucleon Standard Model extrapolated cross-section
and thick source model of flux (MPR), we estimate an event rate of 0.48/yr for
an observatory with two fluorescence detectors with 90% efficiency in the
neutrino energy range 0.5 < E_nu < 5 EeV.Comment: 17 pages, 6 eps figures, revtex 4, new calculation for the
interaction probability end efficienc
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