120319443
Associated multiplicities in proton-proton collisions with a charged hadron atX=0 at the CERN ISR
SummaryCharged-particle multiplicities and angular distributions associated with a π±, K±, p and 

$$
\bar p
$$

 produced at 90°, have been measured at the CERN ISR. The triggering particle was identified by a magnetic spectrometer, within a range of transverse laboratory momentumpT which was different for different particles: 0.075<pT<3.0 GeV/c for pions, 0.075<pT<1.5 GeV/c for kaons, 0.075<pT<3.0 GeV/c for protons and antiprotons. Associated multiplicities have been obtained as a function ofpT at the different ISR beam energies. The distributions of the associated particles have been studied as functions of the azimuthal angleϕ and of the pseudorapidityη. In the high-pT region associated multiplicities increase for all particle types approximately linearly withpT. The momentum of a high-pT particle is seen to be balanced over a wide cone ofϕ andη in the opposite hemisphere. An increase in the multiplicities of secondaries in the same hemisphere near the triggering particle is also observed for the high-pT baryons. At lowpT there is an increase in associated multiplicity on the same side as the transverse momentum of the pion approaches zero.RiassuntoSi presentano le misure effettuate agli ISR del CERN delle molteplicità e distribuzioni angolari delle particelle associate a π±, K±, p e 

$$
\bar p
$$

 prodotti a 90°. La particella di trigger è identificata da uno spettrometro magnetico in grado di analizzare i seguenti intervalli di momento trasversopT nel laboratorio: 0.075<pT<3.0 GeV/c per i π, 0.075< <pT<1.5 GeV/c per K e 0.075<pT<3.0 GeV/c per i protoni e gli antiprotoni. Si studiano le molteplicità delle particelle associate in funzione dell’impulso trasversopT delle particelle di trigger alle varie energie dei fasci circolanti negli ISR. Si studiano anche le distribuzioni delle particelle associate in funzione dell’angoloϕ e della pseudorapiditàη. Ad alto impulso trasverso le molteplicità associate crescono pressapoco linearmente con l’impulsopT. L’impulso di una particella ad altopT è bilanciato su un ampio cono in ϕ e η nell’emisfero opposto. Ad altopT e quando la particella di trigger è un barione si osserva una crescità nella molteplicità delle particelle associate nello stesso emisfero e a piccolo angolo Δϕ e δη rispetto al barione di alto impulso. A bassopT la molteplicità delle particelle associate ai π aumenta quandopT tende a zero.РеэюмеB ЦEPHe на ISR были иэмерены множественности эаряженных частиц и угловые распределения, ассоциированные с π±, K±, p и 

$$
\bar p
$$

, рожденными под углом 90°. Триггерные частицы идентифицируются с помошью магнитного спектрометра в области поперечных импульсовpT в лабораторной системе, которая является раэличной для раэличных частиц: 0.075<pT<3.0 ГзB/c для пионов, 0.075<pT<1.5 ГзB/c для каонов, 0.075<pT<3.0 ГзB/c для протонов и антипротонов. Были определены ассоциированные множественности как функцииpT при раэличных знергиях ISR пучка. Было проведено исследование распределений ассоциированных частиц как функций аэимутального углаϕ и псевдобыстротыη. В области больщихpT ассоциированные множественности увеличиваются для всех типов частиц приблиэительно линейно сpT. По-видимому, импульс частиц с больщимиpT является скомпенсированным в щироком конусеϕ иη в противоположной полусфере. Для барионов с больщимиpT также наблюдается увеличение множественностей вторичных частиц в полусфере около триггерной частицы. При малых рT имеет место увеличение ассоциированной множественности в ту же сторону, как и в случае, когда поперечный импульс пиона стремится к нулю.
117089603
Measurements of the A2- and A2+ Mass Spectra
117830203
Observation of Upsilon, Upsilon', and Upsilon'' at the Cornell electron Storage Ring
The UPSILON, UPSILON', and UPSILON'' states have been observed at the Cornell Electron Storage Ring as narrow peaks in sigma(e/sup +/e/sup -/ ..-->.. hadrons) versus beam energy. Data were collected during a run of 1000 nb/sup -1/, using the Columbia University--Stony Brook segmented NaI detector. The measured mass differences are M(UPSILON')-M(UPSILON)=559 +- 1( +- 3) MeV and M(UPSILON'')-M(UPSILON)=889 +- 1( +- 5) MeV, where the errors in parentheses represent systematic uncertainties. Preliminary values for the leptonic width ratios were also obtained.
126286321
Observation of the Upsilon''' at CESR
121331255
Experimental tests of limiting fragmentation at the ISR
Abstract We present direct tests of the hypothesis of limiting fragmentation from an experiment at the CERN Intersecting Storage Rings at centre-of-mass energies between 31 and 53 GeV. Single-particle inclusive distributions and partial multiplicity distributions are observed for the case in which the energy of one beam is fixed while varying the energy of the other beam. Within cones around the beam, limiting fragmentation is shown to be valid.
120228621
Observation of the Transition $\Upsilon^\prime \to \Upsilon \pi^+ \pi^- \to e^+ e^- \pi^+ \pi^-$
116753469
The SuperB Project
The SuperB project for a next generation asymmetric e+e- flavor factory to be built in the Rome area with a baseline luminosity of 10^{36}cm-2s-1 is discussed. Some explicit examples are given to elucidate how such a facility can provide a uniquely sensitive probe of physics beyond the Standard Model. The basic accelerator concepts allowing luminosities 50-100 times larger than the existing B factories are briefly discussed, along with the main characteristics of the SuperB detector.
120063494
High precision limited streamer drift tubes
Abstract A tracking telescope employing six layers of Al drift tubes 50 cm long, with diameter d = 3 cm and wall thickness 500 μm, has been built and successfully operated with a 40% Ar-60% iC 4 H 10 gas mixture at atmospheric pressure. The tube cells, with a 100 μm thick CuBe wire strung along the axis, enter streamer mode operation at V = 4.6 kV, and feature full efficiency and local resolution of ≤60 μm.
14677203
Study of Solid State Photon Detectors Read Out of Scintillator Tiles
We present preliminary results on efficiency and light collection uniformity read out performances of different assemblies of scintillator tiles, coupled with solid state photon detectors of different make. Our test beam data suggest that the use of 2 mm scintillator tiles without wavelength shifting fibers may be possible in an ILC hadron calorimeter.
14377483
The RPC based IFR system at BaBar experiment: Preliminary results
Abstract The IFR system is a RPC-based detector used to identify muons and neutral hadrons in the BaBar experiment at PEP II machine in SLAC. The RPC system can be used to reconstruct the trajectory of muons, pions and neutral hadrons interacting in the iron of the IFR. The different range and hit pattern allow to discriminate different particles crossing the IFR. An overview of the system design and the preliminary results on the IFR performances are reported.
108905088
A 32 channels charge integrating ADC based on digital signal integration
Abstract A digital charge integrator with programmable gate width and range has been designed for use in the KLOE drift chamber front-end chain. The system has a resolution of 9 bits ranging from 600 fC / count up to ≈ 76  pC and integration time ranging from 100 ns to about 13 μ s . Thirty-two channels have been packaged in a single VME 9U board.