124699225
Total cross-section measurement at the ISR
SummaryWe present the first results of an experiment at the CERN intersecting storage rings, which measures the total cross-section in proton-proton collisions. The equivalent laboratory momenta are 291, 496, 1068 and 1480 GeV/c. We have made a direct measurement of αT as the ratio between the total interaction rate and the machine luminosity. The present paper gives a detailed description of the experimental apparatus and of the analysis procedure. We find that αT increases by about 10% in the energy region studied.RiassuntoSi presentano i primi risultati di un esperimento agli anelli di accumulazione per protoni del CERN, che misura la sezione d'urto totale delle collisioni protone-protone. Gli impulsi equivalenti nel laboratorio sono di 291, 496, 1068 e 1480 GeV/c. Si è eseguita una misura diretta di αT come rapporto fra frequenza totale di interazione e luminosità della macchina. Questo articolo dà una descrizione dettagliata dell'apparato sperimentale e del procedimento di analisi. Si trova che αT aumenta di circa il 10% nell'intervallo di energia studiato.РезюмеМы предлагаем первые результаты эксперимента в ЦЕРНе на встречных накопительных пучках. В эксперименте проводилось измерение полного поперечного сечения в протон-протонных соударениях. Эквивалентный лабораторный импульс составляет 291, 496, 1068 и 1480 ГэВ/с. Мы провели прямое измерение αT как отношения между полной интенсивностью взаимодействия и светимостью машины. В этой работе приводится подробное описание экспериментальной аппаратуры и анализ методики. Мы обнаружили, что αT возрастает на 10% в исследованной области энергий.
117089603
Measurements of the A2- and A2+ Mass Spectra
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.
126286321
Observation of the Upsilon''' at CESR
120228621
Observation of the Transition $\Upsilon^\prime \to \Upsilon \pi^+ \pi^- \to e^+ e^- \pi^+ \pi^-$
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.
120292237
Test of a small prototype of the KLOE drift chamber in magnetic field
Abstract We report on a beam test of a small prototype of the KLOE drift chamber in magnetic field. The chamber was operated with a 90% He–10% iC 4 H 10 gas mixture. Drift space–time relations were studied. The average spatial resolution is about 110 μm in the absence of magnetic field and 120 μm in a 0.6 T magnetic field. Measurements of the primary ionization and drift velocity are reported. The measurement of d E /d x in a He-based gas mixture is also discussed.
56098294
Review of measurements of the angles of the CKM matrix from the BaBar experiment
Experimental results on CP violation measurements in the B meson system from the BABAR experiment at the PEP-II asymmetric B Factory are reviewed.
121829651
Beam test of scintillation tiles with MPPC readout
Abstract This paper describes measurements made using counters composed of a small (3 by 3 by 0.5 cm 3 ) scintillation tile coupled to a Multi-Photon Pixel Counter (MPPC) produced by Hamamatsu and exposed to an electron beam at the Beam Test Facility in Frascati. We show our first results for charge spectra and efficiency, and a very preliminary measurement of device linearity.
110466342
Performance and Aging Studies of BaBar Resistive Plate Chambers
The BaBar detector is currently operating nearly 200 Resistive Plate Chambers (RPCs), constructed as part of an upgrade of the forward endcap muon detector in 2002. Although the average RPC efficiency remains high, numerous changes in the RPC performance (increased currents and rates) have been observed. A few of the highest rate RPCs have suffered efficiency losses of more than 15%. Several types of efficiency loss have been observed. Tests with humidified gas have shown that some of the lost efficiency is recoverable. However, efficiency losses in the highest rate regions have not yet improved with humid gases.
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.