OPEN CHARM ANALYSIS FOR ENERGY LOSS STUDIES WITH ALICE AT LHC

2011 ◽  
Vol 20 (07) ◽  
pp. 1635-1640
Author(s):  
◽  
CHIARA BIANCHIN
Keyword(s):  
Particle Production ◽  
Tracking System ◽  
High Energy ◽  
Open Charm ◽  
Particle Identification ◽  
Identification Performance ◽  
Alice Experiment ◽  
The Status ◽  
Vertex Reconstruction ◽  
Beauty Mesons

In high energy Pb - Pb collisions at LHC a deconfined QCD medium is expected to be produced. The open charm and beauty mesons are a powerful probe to investigate the medium properties and its effects on particle production since they experience all the deconfined phase. The ALICE experiment is well suited to perform open charm analysis thanks to the excellent tracking system, its high resolution secondary vertex reconstruction capabilities and particle identification performance. In this proceeding the status of the analysis of p - p collisions at [Formula: see text] and the perspectives for Pb - Pb measurements will be presented.

scholarly journals ULTRA-LOW INTENSITY PROTON BEAMS FOR RADIATION RESPONSE RELATED EXPERIMENTS AT THE U-120M CYCLOTRON

2018 ◽  
Vol 14 ◽  
pp. 21
Author(s):  
Tomas Matlocha ◽  
Filip Krizek
Keyword(s):  
Proton Beam ◽  
Nuclear Physics ◽  
High Energy Physics ◽  
Tracking System ◽  
Operation Mode ◽  
High Energy ◽  
Ion Source ◽  
Alice Experiment ◽  
Physics Institute ◽  
Academy Of Sciences

The U-120M cyclotron at the Nuclear Physics Institute (NPI) of the Czech Academy of Sciences in Rez is used for radiation hardness tests of electronics for high-energy physics experiments. These tests are usually carried out with proton fluxes of the order of 10<sup>5</sup>–10<sup>9</sup> proton·cm<sup>−2</sup>·s<sup>−1</sup>. Some tests done for the upgrade of the Inner Tracking System of the ALICE experiment at CERN, however, required proton beam intensities several orders of magnitude lower. This paper presents a method which has been developed to achieve the proton beam flux of the order of 1 proton · cm<sup>−2</sup>·s<sup>−1</sup>. The method is mainly based on reduction of the discharge current in the cyclotron internal Penning type ion source. Influence of this new operation mode on the lifetime of ion source cathodes is discussed.

scholarly journals Anti- and Hyper-Nuclei Production at the LHC with ALICE

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 47
Author(s):  
Luca Barioglio
Keyword(s):  
High Energy Physics ◽  
Hadron Collider ◽  
Theoretical Models ◽  
High Energy ◽  
Particle Identification ◽  
Track Reconstruction ◽  
Alice Experiment ◽  
Proton Proton ◽  
Open Question ◽  
Production Mechanisms

At the Large Hadron Collider (LHC) a significant production of (anti-)(hyper-)nuclei is observed in proton-proton (pp), proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions. The measurement of the production yields of light (anti-)nuclei is extremely important to provide insight into the production mechanisms of nuclear matter, which is still an open question in high energy physics. The outstanding particle identification (PID) capabilities of the ALICE detectors allow the identification of rarely produced particles such as deuterons, 3 He and their antiparticles. From the production spectra measured for light (anti-)nuclei with ALICE, the key observables of the production mechanisms (antimatter/matter ratio, coalescence parameter, nuclei/protons ratio) are computed and compared with the available theoretical models. Another open question is the determination of the hypertriton lifetime: published experimental values show a lifetime shorter than the expected one, which should be close to that of the free Λ hyperon. Thanks to the high-resolution track reconstruction capabilities of the ALICE experiment, it has been possible to determine the hypertriton lifetime at the highest Pb-Pb collisions energy with the highest precision ever reached.

scholarly journals Constraints of the Low-x Structure of Protons and Nuclei

2020 ◽  
Vol 235 ◽  
pp. 03001
Author(s):  
Thomas Peitzmann
Keyword(s):  
Particle Production ◽  
Open Charm ◽  
The Status ◽  
Recent Developments ◽  
Electromagnetic Probes ◽  
Low X

I review recent developments in the study of the low-x partonic content of pro- tons and nuclei, with a focus on the latter, as one expects possible deviations from linear QCD evolution to be most pronounced in that case. I give examples of recent theoretical descriptions of HERA measurements with a focus on the role of BFKL evolution. I then concentrate on the status and assumptions of nuclear PDFs and the possibility to use for- ward particle production at the LHC as further constraint, in particular measurements of open charm and the potential of electromagnetic probes.

scholarly journals OPEN CHARM RECONSTRUCTION IN ALICE: D+ → K−π+π+

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2097-2102 ◽  
Author(s):  
◽  
ELENA BRUNA
Keyword(s):  
Cross Section ◽  
Relative Yield ◽  
High Energy ◽  
Open Charm ◽  
Azimuthal Anisotropy ◽  
Absolute Cross Section ◽  
Charm Mesons ◽  
Alice Experiment ◽  
Selection Strategies ◽  
Time Projection

Open charm mesons produced in high energy A-A interactions are expected to be powerful probes to investigate the medium produced in the collision. In this context it is important to measure the production of as many charmed hadrons as possible, such as D 0, D +, [Formula: see text] and Λc, because the measurement of their relative yield can provide information on the hadronization mechanism and is necessary to reduce the systematic error on the absolute cross section. The ALICE experiment at the LHC is designed to perform such measurements at midrapidity down to pT below 1 GeV/c, mainly by means of the silicon vertex and tracker detector, the time projection chamber and the time of flight detector. One of the main channels for the detection of charm production in ALICE is the exclusive reconstruction of the D + meson through its three charged body decay K−π+π+ in Pb - Pb [Formula: see text] and pp [Formula: see text] collisions. The selection strategies for this analysis and the results of a feasibility study on Monte Carlo events will be presented together with the perspectives for the study of D + quenching and azimuthal anisotropy measurements.

scholarly journals Particle production at RHIC and LHC energies

2015 ◽  
Vol 30 (22) ◽  
pp. 1550131 ◽  
Author(s):  
A. Tawfik ◽  
E. Gamal ◽  
A. G. Shalaby
Keyword(s):  
Particle Production ◽  
Hadron Collider ◽  
Center Of Mass ◽  
System Size ◽  
Alice Experiment ◽  
Center Of Mass Energy ◽  
Particle Ratios ◽  
Strangeness Enhancement ◽  
Homogeneous Particle ◽  
Energy Formula

The production of pion, kaon and proton was measured in Pb–Pb collisions at nucleus–nucleus center-of-mass energy [Formula: see text] by the ALICE experiment at Large Hadron Collider (LHC). The particle ratios of these species compared to the RHIC measurements are confronted to the hadron resonance gas (HRG) model and to simulations based on the event generators PYTHIA 6.4.21 and HIJING 1.36. It is found that the homogeneous particle–antiparticle ratios (same species) are fully reproducible by means of HRG and partly by PYTHIA 6.4.21 and HIJING 1.36. The mixed kaon–pion and proton–pion ratios measured at RHIC and LHC energies seem to be reproducible by the HRG model. On the other hand, the strange abundances are underestimated in both event generators. This might be originated to strangeness suppression in the event generators and/or possible strangeness enhancement in the experimental data. It is apparent that the values of kaon–pion ratios are not sensitive to the huge increase of [Formula: see text] from 200 (RHIC) to 2760 GeV (LHC). We conclude that the ratios of produced particle at LHC seem not depending on the system size.

scholarly journals REVIEW OF THE PHENOMENOLOGY OF NONCOMMUTATIVE GEOMETRY

2004 ◽  
Vol 19 (02) ◽  
pp. 179-204 ◽  
Author(s):  
I. HINCHLIFFE ◽  
N. KERSTING ◽  
Y. L. MA
Keyword(s):  
Electric Dipole ◽  
Particle Physics ◽  
Extra Dimensions ◽  
Linear Collider ◽  
Dipole Moments ◽  
High Energy ◽  
Low Energy ◽  
Electric Dipole Moments ◽  
The Status ◽  
High Energy Scattering

We present a pedagogical review of particle physics models that are based on the noncommutativity of space–time, [Formula: see text], with specific attention to the phenomenology these models predict in particle experiments either in existence or under development. We summarize results obtained for high energy scattering such as would occur, for example, in a future e+e-linear collider with [Formula: see text], as well as low energy experiments such as those pertaining to elementary electric dipole moments and other CP violating observables, and finally comment on the status of phenomenological work in cosmology and extra dimensions.

Very-high-energy light charged-particle production near 0° in heavy-ion collisions, 9≤E/A≤40 MeV

1990 ◽  
Vol 42 (4) ◽  
pp. 1519-1529 ◽  
Author(s):  
S. Shaheen ◽  
F. D. Becchetti ◽  
D. A. Roberts ◽  
J. W. Jänecke ◽  
R. L. Stern ◽  
...  
Keyword(s):  
Charged Particle ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
Heavy Ion ◽  
High Energy ◽  
Light Charged Particle ◽  
Ion Collisions ◽  
Charged Particle Production ◽  
Very High Energy ◽  
Very High
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