3,934 research outputs found
Prospects of searches for long-lived charged particles with MoEDAL
We study the prospects of searches for exotic long-lived particles with the
MoEDAL detector at the LHC, assuming the integrated luminosity of 30 fb
that is expected at the end of Run 3. MoEDAL incorporates nuclear track
detectors deployed a few metres away from the interaction point, which are
sensitive to any highly-ionizing particles. Hence MoEDAL is able to detect
singly- or doubly-charged particles with low velocities or , respectively, and lifetimes larger than . We
examine the MoEDAL sensitivity to various singly-charged supersymmetric
particles with long lifetimes and to several types of doubly-charged long-lived
particles with different spins and SU(2) charges. We compare the prospective
MoEDAL mass reaches to current limits from ATLAS and CMS, which involve
auxiliary analysis assumptions. MoEDAL searches for doubly-charged fermions are
particularly competitive.Comment: 19 pages, 5 figure
Prospects for discovering supersymmetric long-lived particles with MoEDAL
We present a study on the possibility of searching for long-lived
supersymmetric partners with the MoEDAL experiment at the LHC. MoEDAL is
sensitive to highly ionising objects such as magnetic monopoles or massive
(meta)stable electrically charged particles. We focus on prospects of directly
detecting long-lived sleptons in a phenomenologically realistic model which
involves an intermediate neutral long-lived particle in the decay chain. This
scenario is not yet excluded by the current data from ATLAS or CMS, and is
compatible with astrophysical constraints. Using Monte Carlo simulation, we
compare the sensitivities of MoEDAL versus ATLAS in scenarios where MoEDAL
could provide discovery reach complementary to ATLAS and CMS, thanks to looser
selection criteria combined with the virtual absence of background. It is also
interesting to point out that, in such scenarios, in which charged staus are
the main long-lived candidates, the relevant mass range for MoEDAL is
compatible with a potential role of Supersymmetry in providing an explanation
for the anomalous events observed by the ANITA detector.Comment: 12 pages, 6 figures; preliminary results presented in
arXiv:1903.11022; matches published version in EPJ
Heavy Ion Physics at the LHC with the ATLAS Detector
The ATLAS detector at CERN will provide a high-resolution
longitudinally-segmented calorimeter and precision tracking for the upcoming
study of heavy ion collisions at the LHC (sqrt(s_NN)=5520 GeV). The calorimeter
covers |eta|<5 with both electromagnetic and hadronic sections, while the inner
detector spectrometer covers |eta|<2.5. ATLAS will study a full range of
observables necessary to characterize the hot and dense matter formed at the
LHC. Global measurements (particle multiplicities, collective flow) will
provide access into its thermodynamic and hydrodynamic properties. Measuring
complete jets out to 100's of GeV will allow detailed studies of energy loss
and its effect on jets. Quarkonia will provide a handle on deconfinement
mechanisms. ATLAS will also study the structure of the nucleon and nucleus
using forward physics probes and ultraperipheral collisions, both enabled by
segmented Zero Degree Calorimeters.Comment: 9 pages, 8 figures, submitted to the Proceedings of Quark Matter
2006, Shanghai, China, November 14-20, 200
Search for massive rare particles with the SLIM experiment
The search for magnetic monopoles in the cosmic radiation remains one of the
main aims of non-accelerator particle astrophysics. Experiments at high
altitude allow lower mass thresholds with respect to detectors at sea level or
underground. The SLIM experiment is a large array of nuclear track detectors at
the Chacaltaya High Altitude Laboratory (5290 m a.s.l.). The results from the
analysis of 171 m exposed for more than 3.5 y are here reported. The
completion of the analysis of the whole detector will allow to set the lowest
flux upper limit for Magnetic Monopoles in the mass range 10 - 10
GeV. The experiment is also sensitive to SQM nuggets and Q-balls, which are
possible Dark Matter candidates.Comment: Presented at the 29-th ICRC, Pune, India (2005
Search for Intermediate Mass Magnetic Monopoles and Nuclearites with the SLIM experiment
SLIM is a large area experiment (440 m2) installed at the Chacaltaya cosmic
ray laboratory since 2001, and about 100 m2 at Koksil, Himalaya, since 2003. It
is devoted to the search for intermediate mass magnetic monopoles (107-1013
GeV/c2) and nuclearites in the cosmic radiation using stacks of CR39 and
Makrofol nuclear track detectors. In four years of operation it will reach a
sensitivity to a flux of about 10-15 cm-2 s-1 sr-1. We present the results of
the calibration of CR39 and Makrofol and the analysis of a first sample of the
exposed detector.Comment: Presented at the 22nd ICNTS, Barcelona 200
Qualitative analysis of mental health service usersâ reported experiences of discrimination
SUSY discovery prospects with MoEDAL
We present a preliminary study on the possibility to search for massive
long-lived electrically charged particles at the MoEDAL detector. MoEDAL is
sensitive to highly ionising objects such as magnetic monopoles or massive
(meta-)stable electrically charged particles and we focus on the latter in this
paper. Requirements on triggering or reducing the cosmic-ray and cavern
background, applied in the ATLAS and CMS analyses for long-lived particles, are
not necessary at MoEDAL, due to its completely different detector design and
extremely low background. On the other hand, MoEDAL requires slow-moving
particles, resulting in sensitivity to massive states with typically small
production cross sections. Using Monte Carlo simulations, we compare the
sensitivities of MoEDAL versus ATLAS/CMS for various long-lived particles in
supersymmetric models, and we seek a scenario where MoEDAL can provide
discovery reach complementary to ATLAS and CMS.Comment: 8 pages, 5 figures; invited talk in 6th Symposium on Prospects in the
Physics of Discrete Symmetries (DISCRETE 2018), 26-30 Nov 2018, Vienna,
Austria, presented by V.A.M.; minor changes matching published versio
Improved Experimental Limits on the Production of Magnetic Monopoles
We present new limits on low mass accelerator-produced point-like Dirac
magnetic monopoles trapped and bound in matter surrounding the D\O collision
region of the Tevatron at Fermilab (experiment E-882). In the context of a
Drell-Yan mechanism, we obtain cross section limits for the production of
monopoles with magnetic charge values of 1, 2, 3, and 6 times the minimum Dirac
charge of the order of picobarns, some hundred times smaller than found in
similar previous Fermilab searches. Mass limits inferred from these cross
section limits are presented.Comment: 5 pages, 4 eps figures, REVTe
Search for strange quark matter and Q-balls with the SLIM experiment
We report on the search for Strange Quark Matter (SQM) and charged Q-balls
with the SLIM experiment at the Chacaltaya High Altitude Laboratory (5230 m
a.s.l.) from 2001 to 2005. The SLIM experiment was a 427 m array of
Nuclear Track Detectors (NTDs) arranged in modules of cm
area. SLIM NTDs were exposed to the cosmic radiation for 4.22 years after which
they were brought back to the Bologna Laboratory where they were etched and
analyzed. We estimate the properties and energy losses in matter of nuclearites
(large SQM nuggets), strangelets (small charged SQM nuggets) and Q-balls; and
discuss their detection with the SLIM experiment. The flux upper limits in the
CR of such downgoing particles are at the level of /cm/s/sr
(90% CL).Comment: 4 pages, 7 eps figures. Talk given at the 24th International
Conference on Nuclear Tracks in Solids, Bologna, Italy, 1-5 September 200
Tripolitania under the Roman Empire
The reason the subject is chosen within this period is that an adequate study has never been given to it, probably because of the rarity of the references and the difficulty of their languages and the paucity of the specialists in this period of Libyan ancient history. So, as far as the writer is alare, no synthesis of materials is available in English. The fact that many publications have been utilised gives this project a claim to be regarded as up to date. The work is divided into two parts.
The first consists of five chapters:-
Chapter I deals with the conditions of the region before Roman rule (46 B.C.).
Chapter II is concerned with the civil war and its effects
, on the region of Tripolitania. Light is thrown on the
political history of Tripolitania during the period from Julius Caesar to Augustus (47 B.C. to 14 A.D.). In this Chapter the Roman policy towards the region, taken by Caesar, and the reâarrangement of the Numidian Kingdom by Augustus and its relationships with the region is discussed.
Chapter III deals in detail with the revolts of the indigenous people of the conquered districts and the Roman attempts to quell these risings.
Chapter IV is concerned with political conditions of the region under the Antonine regime from Trajan to Commodus and treats the tribal limitatio and settlement.
Chapter V deals with the conditions of the region under the Severan emperors from Septimius Severus to Alexanaer Severus' (A.D. 193 â 235). The political attitude of the founder of this regime Septimius Severus, and his successors, from this family)
towards the region is looked into, together with the defensive system (limes Tripolitanus) which he had initiated and which was completed by his successors (Chap. VI).
The fifty years followinc, the assassination of Alexander' Severus (235 A.D.) saw the decline of the Roman Empire economically politically and socially. During this period the throne was much contested.
The second part of this thesis is concerned with the important aspects of civilization of the region under the Roman rule.
Chapter VI is a comprehensive study of the limes Tripolitanus in the region, in its historical context and it is concerned
with the dating of the fortifications in southern Tripolitania.
Chapter VII is concerned with the administrative organization of. Roman Tripolitania and special attention is paid to the municipal development and the existence of Punic administration
in the Roman period, at least till Hadrian's time.
Chapter VIII, a study of the economy of Roman Tripolitania and technical in nature is concerned with agricultural, industrial and commercial advances made in this period (4734.-235A.D.) and also with the trade routes used
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