2,595 research outputs found
The status of the Silicon Pixel Detector readout for the ALICE experiment at CERN
No full textThe design of silicon pixel detector for the ALICE experiment at LHC approaches its final phase. The most complex part of the detector, the front-end readout chip was recently delivered for testing. In this paper, we describe the readout architecture of the detector. An overview of the test systems is presented
An MXI-II Based Setup for Controlling the ALICE TPC Front-End Digitizing Card (FEDC)
No full text Abstract The described software was developed to control the ALICE FEDC board [1]. Originally it was designed for low event rates while testing the GEM readout for Alice TPC [2]. It is written in LabView, using the VISA and VXI libraries [3]. The experimental setup is based on FEDC board and National Instruments PCI to VME Bridge, the MXI-2. The software described in this note was designed as a modular system carrying all the tasks from the board setup through data acquisition up to data monitoring. </HTML
ALICE Detector Control System
No full textThe Detector Control System (DCS) is responsible for SAFE and STABLE operation of the ALICE experiment. The DCS interacts with ALICE Online and Offline systems as well as with external services
Users' Guide to the ALICE Pixel Readout Prototypes Test Setup
No full text Abstract Pilot and Serlink cards are two basic prototypes of ALICE Pixel detector readout system [1]. This note describes the software used to debug and test the cards. This note is a "users guide" to the system. For more detailed information about Pilot and Serlink, please refer to [2,3] and references herein. A WWW version of this note is a part of the test software. It can be accessed directly from front panels, or at [4]. </HTML
A VME MXI-II Based Setup for Testing ALICE Pixel Readout Prototypes
No full text Abstract One of the possible readout scenarios for ALICE ITS pixel layers counts on in- situ zero suppression, performed by Pilot control chip. Preprocessed event will be then serialized and sent out via about 50 m long copper cable for further processing. The VME prototypes of Pilot chip and link (called "SHORTLINK") were developed in the frames of Alice collaboration. Here we describe the VME test system, developed to test the modules. </HTML
Study of the p–p–K + and p–p–K - dynamics using the femtoscopy technique
No full textThe interactions of kaons (K) and antikaons (K ̄) with few nucleons (N) were studied so far using kaonic atom data and measurements of kaon production and interaction yields in nuclei. Some details of the three-body KNN and K ̄ NN dynamics are still not well understood, mainly due to the overlap with multi-nucleon interactions in nuclei. An alternative method to probe the dynamics of three-body systems with kaons is to study the final state interaction within triplet of particles emitted in pp collisions at the Large Hadron Collider, which are free from effects due to the presence of bound nucleons. This Letter reports the first femtoscopic study of p–p–K + and p–p–K - correlations measured in high-multiplicity pp collisions at s = 13 TeV by the ALICE Collaboration. The analysis shows that the measured p–p–K + and p–p–K - correlation functions can be interpreted in terms of pairwise interactions in the triplets, indicating that the dynamics of such systems is dominated by the two-body interactions without significant contributions from three-body effects or bound states
Towards the understanding of the genuine three-body interaction for p-p-p and p-p-Lambda
No full textThree-body nuclear forces play an important role in the structure of nuclei and hypernuclei and are also incorporated in models to describe the dynamics of dense baryonic matter, such as in neutron stars. So far, only indirect measurements anchored to the binding energies of nuclei can be used to constrain the three-nucleon force, and if hyperons are considered, the scarce data on hypernuclei impose only weak constraints on the three-body forces. In this work, we present the first direct measurement of the p–p–p and p–p– Λ systems in terms of three-particle correlation functions carried out for pp collisions at s=13 TeV. Three-particle cumulants are extracted from the correlation functions by applying the Kubo formalism, where the three-particle interaction contribution to these correlations can be isolated after subtracting the known two-body interaction terms. A negative cumulant is found for the p–p–p system, hinting to the presence of a residual three-body effect while for p–p– Λ the cumulant is consistent with zero. This measurement demonstrates the accessibility of three-baryon correlations at the LHC
Study of the p–p–K and p–p–K dynamics using the femtoscopy technique
No full textThe interactions of kaons (K) and antikaons (K)
with few nucleons (N) were studied so far using kaonic
atom data and measurements of kaon production and interaction yields in nuclei. Some details of the three-body KNN
and KNN dynamics are still not well understood, mainly
due to the overlap with multi-nucleon interactions in nuclei.
An alternative method to probe the dynamics of three-body
systems with kaons is to study the final state interaction
within triplet of particles emitted in pp collisions at the Large
Hadron Collider, which are free from effects due to the presence of bound nucleons. This Letter reports the first femtoscopic study of p–p–K+ and p–p–K− correlations measured in high-multiplicity pp collisions at √s = 13 TeV
by the ALICE Collaboration. The analysis shows that the
measured p–p–K+ and p–p–K− correlation functions can be
interpreted in terms of pairwise interactions in the triplets,
indicating that the dynamics of such systems is dominated
by the two-body interactions without significant contributions from three-body effects or bound states
Inclusive measurements of the K+- and p / anti-p production in hadronic Z0 decays
No full textThis analysis, based on a sample of 170000 hadronic Z0 decays, provides a measurement of the K± and p/p̄ differential cross sections which is compared to string- and cluster fragmentation models. The total multiplicities for K± and p/p̄ per hadronic event were found to be: NK = 2.26 ± 0.18 and Np = 1.07 ± 0.14. The positions ξ* of the maxima of the differential cross sections as a function of ξ = In(1/xp) for K± and p/p̄ were determined to be 2.63 ± 0.07 and 2.96 ± 0.16 respectively. A comparison of the ξ* values for various identified particles measured at LEP with the prediction of the Modified Leading Logarithm Approximation with Local Parton Hadron Duality model has been performed. The measured ξ* position as a function of the hadron mass, after corrections due to particle decays, is in agreement with the model calculation.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Rapidity-rank structure of p anti-p pairs in hadronic Z0 decays
No full textThe rapidity-rank structure of pp̄ pairs is used to analyze the mechanism of baryon production in hadronic Z0 decay. The relative occurrence of the rapidity-ordered configuration p M p̄, where M is a meson, and that of pp̄ adjacent pairs is compared. The data are found to be consistent with predictions from a mechanism producing adjacent-rank pp̄ pairs, without requiring 'string-ordered' p M p̄ configurations. An upper limit of 15% at 90% confidence is determined for the p M p̄ contribution. (C) 2000 Elsevier Science B.V.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
- …
