4,575 Works

MULTI-HADRONS PRODUCTION THROUGH THE PHOTON-PHOTON INTERACTION

G.BARBIELLINI, F.CERADINI, M.L.FERRER, S.ORITO, L.PAOLUZI, R.SANTONICO & T.TSURU

Common origin of the shoulder structure and of the oscillations of moments in multiplicity distributions in e(+)e(-) annihilations

Alberto Giovannini, Sergio Lupia & Roberto Ugoccioni
We show, via a simple parametrization of the multiplicity distribution of charged particles in e(+)e(-) annihilation at the Z0 peak in terms of the weighted superposition of two negative binomial distributions, that both the shoulder structure in the intermediate multiplicity range and the oscillation in sign of the ratio of factorial cumulants over factorial moments of increasing order are related to hard gluon radiation.

The Single Reflection Regime of X-Rays Travelling into a Monocapillary

S.B. Dabagov & A. Marcelli
In this manuscript an analysis of the transmission of x-rays through a single monocapillary under the single reflection regime is presented and discussed. Because ray tracing does not allow to explain the experimental data, a first qualitative interpretation of the observed behavior is given in the framework of the wave theory.

EXAFS STUDIES ON NANOCRYSTALLINE MATERIALS WITH DOPED GRAIN BOUNDARIES

F. BOSCHERINI, T. HAUBOLD, S. PASCARELLI, S. MOBILIO & H. GLEITER
We present an EXAFS study of the local environment of Co dopant atoms in nanocrystalline Cu. Due to the low solubility of Co atoms in bulk Cu, these measurements yield information on the local atomic structure of grain boundaries in nanocrystalline Cu. Previous EXAFS studies on pure nanocrystalline metals have indicated an atomic arrangement in the grain boundary component exhibiting a broad distribution of interatomic spacings which differs from the atomic structure of the crystalline...

PERFORMANCES OF HEAD-ON Pb-SCIFI CALORIMETRIC MODULES

D. BABUSCI, A. BARILE, S. BIANCO, R. CASACCIA, L. E. CASANO, M. CAPOGNI, A. D' ANGELO, L. DANIELLO, D. FABBRI, F. L. FABBRI, G. GATTA, M. GIARDONI, B. GIROLAMI, D. HERTZOG, S. HUGHES, M. LINDOZZI, D. MORICCIANI, L. PASSAMONTI, N. I. QAZI, P. REIMER, V. RUSSO, S. SARWAR, R. TAYLOE, M. VENTURA, L. VOTANO … & A. ZALLO
The article reports on performances of head-on Pb-scintillating fibres e.m. calorimetric modules ('H.O.P.S. ') exposed to a 20-80 MeV tagged photon beam. Good linearity and energy resolution better than 6%/ \\sqrt{E} were achieved therefore showing that this technique is suitable for experimentation at ϕ-factories, even at the lowest end of the photon energy range.

REFFREDDAMENTO CON ELETTRONI AL LEAR p - ANTI p COLLIDER

U. BIZZARRI, M. CONTE, R. SCRIMAGLIO, L. TECCHIO & A. VIGNATI

PHYSICS ITEMS, DIFFERENT FROM ε'/ε, AT A ϕ-FACTORY

R. BALDINI & FERROLI
Some physics items, differend from ε'/ε, are briefly summarized with some emphasis on the experimental point of view, as they have been presented at this workshop. Namely: structure functions of weak and e.m. Kaon decays, radiative ϕ decays into scalar and pseudoscalar mesons, spectroscopy of excited vector mesons, γγ interactions, Kaon-Nucleon and Kaon-Nucleus interactions at very low energies, Hypernuclei formation with stopped Kaons, measurement of the hadronic contribution to the muon anomalous magnetic moment.

Nbn: A Fast, Low Cost, Mini Data Acquisition System for Nuclear Physics

Antonio Ordine
A multiparametric data acquisition system, based on VME system and Macintosh desktop computer, has been developed as an evolution towards smaller size (few tens of raw parameters) nuclear physics experiments of an acquisition system implemented for heavy ion induced nuclear reactions (few hundreds of parameters and high counting rates) using VME, CAMAC-FERA modules and middle size Work-Station (as Digital alpha station and/or HP WS). The system acquires data from VME ADCs, processes and stores them...

Quantizable non-local gravity

Marin Diego
It's widely recognized that general relativity emerges if we impose invariance under local translations and local Lorentz transformations. In the same manner supergravity arises when we impose invariance under local supersymmetry. In this paper we show how to treat general relativity as a common gauge theory, without introducing a metric or a tetrad field. The price to pay for such simplification is the acceptance of non-locality. At first glance the resulting theory seems renormalizable. Finally...

Study of Tensile Response of Kapton and Mylar Strips to AR and CO2 Mixtures for the BteV Straw Tube Detector

E.Basile, F., Bellucci, M.Bertani, S.Bianco, M.A.Caponero, F.DiFalco, F.L.Fabbri, F.Felli, M.Giardoni, A., La, Monaca, G.Mensitieri, B.Ortenzi, M.Pallotta, A.Paolozzi, L.Passamonti, D.Pierluigi, A.Russo & S.Tomassin
Gas mixtures are known to affect mechanical properties of plastic materials of interest in HEP gas detectors. We have studied tensile properties of several materials for use in the straw tube detector of experiment BteV at the Fermilab Tevatron. A straw tube is a complex structure made up of two different layers of polymeric material with aluminium deposition and glue, therefore we have decoupled all these elements to better understand gas effect on each one....

The QCal Tile Calorimeter of KLOE

M. Adinolfi, F. Ambrosino, M. Antonelli, C. Bini, V. Bocci, F. Bossi, P. Branchini, G. Cabibbo, R. Caloi, G. Carboni, M. Casarsa, G. Cataldi, P. Ciambrone, S. Conetti, E. De Lucia, P. De Simone, S. Dell'Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, A. Ferrari, G. Finocchiaro, C. Forti … & A. Ventura
The quadrupole tile calorimeters of KLOE (QCAL) are two compact detectors placed close to the interaction point and surrounding the focusing quadrupoles. Their purpose is to increase the hermeticity of KLOE calorimetry. Each QCAL consists of a sampling structure of lead plates and scintillator tiles with wavelength shifter (WLS) fibers and mesh photomultiplier readout arranged in 16 azimuthal sectors. The arrangement of WLS fibers allows the measurement of the longitudinal position of the showers from...

VLT observations of Fermi pulsars

R. P. Mignani, A. Shearer, A. De Luca, P. Moran, S. Collins & M. Marelli
Many energetic gamma-ray pulsars discovered by Fermi are promising candidates for optical follow-ups. We present the results of the first deep optical observations of the two Vela-like Fermi pulsars PSR J1357-6429 and PSR J1048-5832 performed with the VLT. However, they have not been detected down to V~27 and V~27.6, respectively (3 sigma). These upper limits suggest an efficiency in converting spin-down power into optical luminosity < 7x10d-7 and <6x10d-6, respectively, lower than the Crab pulsar...

Holomorphic eigenfunctions of the vector field associated with the dispersionless Kadomtsev-Petviashvili equation

P. G. Grinevich & P. M. Santini
Vector fields naturally arise in many branches of mathematics and physics. Recently it was discovered that Lax pairs for many important multidimensional integrable partial differential equations (PDEs) of hydrodynamic type (also known as dispersionless PDEs) consist of vector field equations. These vector fields have complex coefficients and their analytic, in the spectral parameter, eigenfunctions play an important role in the formulations of the direct and inverse spectral transforms. In this paper we prove existence of...

Single transverse spin asymmetries for semi-inclusive pion production in DIS

M. Anselmino, M. Boglione & F. Murgia
We present a phenomenological approach to the description of single transverse spin asymmetries (STSA) in inclusive hadron production. It generalizes the pQCD formalism for high energies and large p_T inclusive hadron production processes, A+B -> C+X, by incorporating quark intrinsic motion in the spin dependent quark distribution and fragmentation functions. We concentrate here on spin and k_T effects in the fragmentation process of a polarized quark into the observed hadron, and give predictions for STSA...

Calibrating the Photosensors for the DCAL Extension of the Alice Electromagnetic Calorimeter: An Activity Report

F. Astuti, A.Badalà, A.Calivà , A.Grimaldi, V.Indelicato, P. La Rocca, F.Librizzi, G.S.Pappalardo, O.Parasole, C.Petta & F. Riggi
The activity carried out to characterize and assemble a final set of about 1700 Avalanche Photo Diodes (APD) to be used in the additional super-modules of the DCAL ALICE electromagnetic calorimeter is described

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