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12 results on '"PRECISION-MEASUREMENT"'

1. Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging

Author

Christian Weiss and Wim Cosyn

Subjects
Nuclear Theory, FOS: Physical sciences, PRECISION-MEASUREMENT, Electron, Spin structure, PROTON, 01 natural sciences, Nuclear physics, Nuclear Theory (nucl-th), ASYMMETRIES, High Energy Physics - Phenomenology (hep-ph), POWER CORRECTIONS, 0103 physical sciences, SPIN STRUCTURE, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Wave function, Nuclear Experiment, STRUCTURE FUNCTIONS G(2), HE-3, OPERATORS, Physics, 010308 nuclear & particles physics, Scattering, Deep inelastic scattering, High Energy Physics - Phenomenology, Physics and Astronomy, Deuterium, RULES, BJORKEN SUM, Nucleon
Abstract

Background: DIS on the polarized deuteron with detection of a proton in the nuclear breakup region (spectator tagging) represents a unique method for extracting the neutron spin structure functions and studying nuclear modifications. The tagged proton momentum controls the nuclear configuration during the DIS process and enables a differential analysis of nuclear effects. Such measurements could be performed with the future electron-ion collider (EIC) and forward proton detectors if deuteron beam polarization could be achieved. Purpose: Develop theoretical framework for polarized deuteron DIS with spectator tagging. Formulate procedures for neutron spin structure extraction. Methods: A covariant spin density matrix formalism is used to describe general deuteron polarization in collider experiments (vector/tensor, pure/mixed). Light-front (LF) quantum mechanics is employed to factorize nuclear and nucleonic structure in the DIS process. A 4-dimensional representation of LF spin structure is used to construct the polarized deuteron LF wave function and efficiently evaluate the spin sums. Free neutron structure is extracted using the impulse approximation and analyticity in the tagged proton momentum (pole extrapolation). Results: General expressions of the polarized tagged DIS observables in collider experiments. Analytic and numerical study of the polarized deuteron LF spectral function and nucleon momentum distributions. Practical procedures for neutron spin structure extraction from the tagged deuteron spin asymmetries. Conclusions: Spectator tagging provides new tools for precise neutron spin structure measurements. D-wave depolarization and nuclear binding effects can be eliminated through the tagged proton momentum dependence. The methods can be extended to tensor-polarized observables, spin-orbit effects, and diffractive processes., Comment: 52 pages, 19 figures

Published
2020

2. The Belgian Repository of Fundamental Atomic Data and Stellar Spectra (BRASS) identifying fruitful methods for producing atomic data

Author

M. David, Herman Hensberge, Thibault Merle, E. Thienpont, M. Laverick, Pierre Royer, C. Martayan, Alex Lobel, Peter A. M. van Hoof, and Mathieu Van Der Swaelmen

Subjects
PROBABILITIES, TI-I, Computer science, lcsh:Astronomy, atomic and molecular databases, RELATIVE OSCILLATOR-STRENGTHS, oscillator strengths, LINES, Astrophysics::Cosmology and Extragalactic Astrophysics, PRECISION-MEASUREMENT, Astronomy & Astrophysics, 01 natural sciences, Astronomical spectroscopy, stellar spectra, Brass, lcsh:QB1-991, 0103 physical sciences, atomic data, Astrophysics::Solar and Stellar Astrophysics, Physics::Atomic Physics, 010306 general physics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, A1D2 0.90 EV, Science & Technology, SI-I, Quality assessment, Physics, Astronomy, Astronomy and Astrophysics, LIFETIMES, Stars, FE-I TRANSITIONS, Homogeneous, visual_art, Physical Sciences, NI-I, visual_art.visual_art_medium, Astrophysics::Earth and Planetary Astrophysics, Atomic data
Abstract

The Belgian repository of fundamental atomic data and stellar spectra (BRASS) aims to provide the largest systematic and homogeneous quality assessment to-date of input atomic data required for stellar spectral synthesis. In addition to quality-assessed atomic data, BRASS shall also provide of a range of extremely high-quality benchmark stellar spectra spanning late B-type stars to early K-type stars. In this paper, we summarise the project&rsquo, s progress and available results to-date. We provide a brief comparison between our results and the BRASS project&rsquo, s compiled and cross-matched atomic literature, with the goal of providing useful feedback to the atomic community on which methods may produce more reliable and accurate atomic data. We hope that the examples presented here stimulate further investigation by the atomic physics community.

Published
2018

3. Fe I oscillator strengths for transitions from high-lying odd-parity levels

Author

Ulrike Heiter, Juliet C. Pickering, M. P. Ruffoni, James E. Lawler, E. A. Den Hartog, A. Guzman, M. T. Belmonte, Imperial College Trust, Science and Technology Facilities Council (STFC), and Science and Technology Facilities Council

Subjects
MODEL ATMOSPHERES, PROBABILITIES, 0306 Physical Chemistry (Incl. Structural), ACCURACY, Fourier transform spectrometers, FOS: Physical sciences, PRECISION-MEASUREMENT, Astronomy & Astrophysics, Branching (polymer chemistry), 01 natural sciences, 0305 Organic Chemistry, methods: laboratory: atomic, LTE LINE FORMATION, 0103 physical sciences, atomic data, RADIATIVE LIFETIMES, 010306 general physics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Parity bit, Physics, Science & Technology, LATE-TYPE STARS, NEUTRAL HELIUM, Astronomy and Astrophysics, line: profiles, CRITICAL COMPILATION, 0201 Astronomical And Space Sciences, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Physical Sciences, Atomic physics, MULTIPLET TABLE, techniques: spectroscopic, Atomic data
Abstract

We report new experimental Fe I oscillator strengths obtained by combining measurements of branching fractions measured with a Fourier Transform spectrometer and time-resolved, laser-induced fluorescence lifetimes. This study covers the spectral region ranging from 213 to 1033 nm. A total of 120 experimental log( ) gf -values coming from 15 odd-parity energy levels are provided, 22 of which have not been reported previously and 63 of which have values with lower uncertainty than the existing data. The radiative lifetimes for 60 upper energy levels are presented, 39 of which have no previous measurements.

Published
2017

4. Non-LTE line formation of Fe in late-type stars IV: Modelling of the solar centre-to-limb variation in 3D

Author

Jorrit Leenaarts, Manuel A. Bautista, Karin Lind, Maria Bergemann, Martin Asplund, Tiago M. D. Pereira, Remo Collet, Anish M. Amarsi, Paul S. Barklem, and Dan Kiselman

Subjects
atmosphere [Sun], QUIET SUN, Astrophysics::High Energy Astrophysical Phenomena, RELATIVE OSCILLATOR-STRENGTHS, observational [methods], FOS: Physical sciences, Astrophysics, PRECISION-MEASUREMENT, I TRANSITIONS, 7. Clean energy, 01 natural sciences, CROSS-SECTIONS, formation [line], abundances [Sun], Astronomi, astrofysik och kosmologi, 0103 physical sciences, EXCITATION, atomic data, Astronomy, Astrophysics and Cosmology, Astrophysics::Solar and Stellar Astrophysics, 010306 general physics, Variation (astronomy), 010303 astronomy & astrophysics, Absolute zero, Astrophysics::Galaxy Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Physics, IRON ABUNDANCES, Solar spectra, Late type, Astronomy, Astronomy and Astrophysics, numerical [methods], Methods observational, SIMULATIONS, Stars, STELLAR ATMOSPHERES, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Physics::Space Physics, Critical test, Astrophysics::Earth and Planetary Astrophysics, Atomic data
Abstract

Our ability to model the shapes and strengths of iron lines in the solar spectrum is a critical test of the accuracy of the solar iron abundance, which sets the absolute zero-point of all stellar metallicities. We use an extensive 463-level Fe atom with new photoionisation cross-sections for FeI as well as quantum mechanical calculations of collisional excitation and charge transfer with neutral hydrogen; the latter effectively remove a free parameter that has hampered all previous line formation studies of Fe in non-local thermodynamic equilibrium (NLTE). For the first time, we use realistic 3D NLTE calculations of Fe for a quantitative comparison to solar observations. We confront our theoretical line profiles with observations taken at different viewing angles across the solar disk with the Swedish 1-m Solar Telescope. We find that 3D modelling well reproduces the observed centre-to-limb behaviour of spectral lines overall, but highlight aspects that may require further work, especially cross-sections for inelastic collisions with electrons. Our inferred solar iron abundance is log(eps(Fe))=7.48+-0.04., Comment: 13 pages, 8 figures, accepted for publication in MNRAS

Published
2017
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5. Fe I Oscillator Strengths for Transitions from High-lying Even-Parity Levels

Author

Karin Lind, Nicholas R. Brewer, E. A. Den Hartog, James E. Lawler, Juliet C. Pickering, M. P. Ruffoni, Science and Technology Facilities Council (STFC), and Science and Technology Facilities Council [2006-2012]

Subjects
MODEL ATMOSPHERES, PROBABILITIES, astro-ph.SR, stars: abundances, ENERGIES, ACCURACY, FOS: Physical sciences, LINES, PRECISION-MEASUREMENT, Astronomy & Astrophysics, Electromagnetic radiation, Spectral line, 0201 Astronomical and Space Sciences, Radiative transfer, atomic data, Sun: abundances, Instrumentation and Methods for Astrophysics (astro-ph.IM), Solar and Stellar Astrophysics (astro-ph.SR), Physics, 0306 Physical Chemistry (incl. Structural), Photosphere, Science & Technology, LATE-TYPE STARS, Branching fraction, Stellar atmosphere, Astronomy and Astrophysics, LIFETIMES, CRITICAL COMPILATION, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Physical Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic physics, 0.5-PERCENT, Luminescence, Astrophysics - Instrumentation and Methods for Astrophysics, Dimensionless quantity, astro-ph.IM
Abstract

New radiative lifetimes, measured to $\pm$ 5 % accuracy, are reported for 31 even-parity levels of Fe I ranging from 45061 cm$^{-1}$ to 56842 cm$^{-1}$. These lifetimes have been measured using single-step and two-step time-resolved laser-induced fluorescence on a slow atomic beam of iron atoms. Branching fractions have been attempted for all of these levels, and completed for 20 levels. This set of levels represents an extension of the collaborative work reported in Ruffoni et al. (2014). The radiative lifetimes combined with the branching fractions yields new oscillator strengths for 203 lines of Fe I. Utilizing a 1D-LTE model of the solar photosphere, spectral syntheses for a subset of these lines which are unblended in the solar spectrum yields a mean iron abundance of = 7.45 $\pm$ 0.06., Comment: 18 pages, 4 tables, 4 figures. Accepted for publication in the Astrophysical Journal Supplement Series

Published
2014

6. Leading-order QCD analysis of neutrino-induced dimuon events

Author

Vilain, P., Wilquet, G., Beyer, R., Flegel, W., Mouthuy, T., Øverås, H., Panman, J., Rozanov, A., Winter, K., Zacek, G., Zacek, V., Büsser, F. W., Foos, C., Gerland, L., Layda, T., Niebergall, F., Rädel, G., Stähelin, P., Voss, T., Favart, D., Grégoire, Gh, Knoops, E., Lemaître, V., Gorbunov, P., Grigoriev, E., Khovansky, V., Maslennikov, A., Lippich, W., Nathaniel, A., Staude, A., Vogt, J., Alfredo Giuseppe Cocco, Ereditato, A., Fiorillo, G., Marchetti-Stasi, F., Palladino, V., Strolin, P., Capone, A., Pedis, D., Dore, U., Frenkel-Rambaldi, A., Loverre, P. F., Macina, D., Piredda, G., Santacesaria, R., Di Capua, E., Ricciardi, S., Saitta, B., Akkus, B., Arik, E., Serin-Zeyrek, M., Sever, R., Tolun, P., Hiller, K., Nahnhauer, R., Roloff, H. E., P., Vilain, G., Wilquet, R., Beyer, W., Flegel, T., Mouthuy, H., Overa, J., Panman, A., Rozanov, K., Winter, G., Zacek, V., Zacek, F. W., Busser, C., Foo, L., Gerland, T., Layda, F., Niebergall, G., Radel, P., Stahelin, T., Vo, D., Favart, G., Gregoire, E., Knoop, V., Lemaitre, P., Gorbunov, E., Grigoriev, V., Khovansky, A., Maslennikov, W., Lippich, A., Nathaniel, A., Staude, J., Vogt, A. G., Cocco, A., Ereditato, Fiorillo, Giuliana, F., Marchetti Stasi, Palladino, Vittorio, P., Strolin, A., Capone, D. D., Pedi, U., Dore, A., Frenkel Rambaldi, P. F., Loverre, D., Macina, G., Piredda, R., Santacesaria, E. D., Capua, S., Ricciardi, B., Saitta, B., Akku, E., Arik, M., Serin Zeyrek, R., Sever, P., Tolun, K., Hiller, R., Nahnhauer, and H. E., Roloff

Subjects
Quark, Physics, Quantum chromodynamics, Strange quark, Particle physics, ELECTROWEAK MIXING ANGLE, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Order (ring theory), PRECISION-MEASUREMENT, CHARGED CURRENT, Charm quark, Nuclear physics, Content (measure theory), SCATTERING, High Energy Physics::Experiment, Production (computer science), HEAVY QUARKS, Charm (quantum number), Nuclear Experiment, DETECTOR, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The results of a leading-order QCD analysis of neutrino-induced charm production are presented. They are based on a sample of 4111 $\nu_\mu$ - and 871 $\bar \nu_\mu$ -induced opposite-sign dimuon events with $E_{\mu 1},E_{\mu 2} > 6{\rm GeV}$ , $35 < E_{\nu} < 290{\rm GeV}$ and $Q^2> 5.5\,{\rm GeV^2}$ , observed in the CHARM II detector exposed to the CERN wide band neutrino and antineutrino beams. The analysis yields the value of the charm quark mass $m_c=1.79\pm0.38\,{\rm GeV}/c^2$ and the Cabibbo–Kobayashi–Maskawa matrix element $|V_{cd}|=0.219\pm0.016$ . The strange quark content of the nucleon is found to be suppressed with respect to non-strange sea quarks by a factor $\kappa =0.39\pm0.09$ .

Published
1999
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7. Relativistic mean field calculation of parity-violating observables in francium

Author

C. S. Warke, Swati Kulkarni, and Y. K. Gambhir

Subjects
Physics, Nuclear and High Energy Physics, Precision-Measurement, chemistry.chemical_element, Observable, Parity (physics), Trapping, E1 Transition Amplitudes, Atomic Cesium, Francium, Nuclear physics, Perturbation-Theory, Finite Nuclei, Nuclear Anapole Moment, Energy-Levels, Electroweak Theory, Amplitude, chemistry, Mean field theory, Nonconserving Optical-Rotation, Hyperfine-Structure, Physics::Atomic Physics, Hyperfine structure, Order of magnitude
Abstract

A formalism developed previously to study the smaller nuclear spin-dependent parity-violating effects using the relativistic mean field theory has been generalized to the case of odd-odd nuclear systems such as Fr-210. Because of the recent success in trapping Fr atoms, parity-violation experiments for Fr seem feasible. The nuclear spin-dependent parameters eta and eta' are calculated using the anapole moment parameters kappa(p) and kappa(n). They are used to calculate the hyperfine transition amplitudes for the 6S-->7S transition in Cs-134 and 7S -->8S in Fr-210. The calculated hyperfine transition amplitudes in Fr are one order of magnitude larger than those in Cs.

Published
1998
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8. Upper limit on the lifetime difference of shortlived and longlived B0(S) mesons

Author

C. Lapoint, A. Straessner, H. El Mamouni, Luca Lista, Juven Wang, F. Di Lodovico, J. M. You, M. Rescigno, Mingshui Chen, J. Gerald, Z. A. Liu, R. Faccini, A. Buijs, A. Vorvolakos, Willis Lin, D. Migani, X. L. Wang, G. G.G. Massaro, Sabine Riemann, Oleg Fedin, J. G. Xu, S. C. Blyth, M. Pauluzzi, M. Vivargent, D. Piccolo, Peter H. Fisher, J. Busenitz, Marco Meschini, D. Kirkby, Stefan Roth, A. Pevsner, D. Ren, A. Lavorato, J. Shukla, V. Koutsenko, Christopher George Tully, S. S. Gau, E. Drago, M. Gataullin, L. Romero, H. Anderhub, Aleandro Nisati, R. Leiste, Christoph Paus, Wolfgang Lohmann, H. Vogt, A. M. Cartacci, A. P. Colijn, J. M. Le Goff, M. N. Kienzle-Focacci, V. K. Gupta, Joseph Quartieri, B. Bertucci, S. C. Kim, F. Anselmo, Nicanor Colino, W. J. Burger, A. C. König, M. Bourquin, S. Pensotti, Valery Schegelsky, Antonino Zichichi, A. Lebedev, Dong-Chul Son, H. Rykaczewski, N. Gheordanescu, Giovanni Organtini, S. Braccini, D. Ruschmeier, B. Monteleoni, T. Angelescu, J. Casaus, O. Rind, Michael Dittmar, A. Csilling, J. J. Blaising, Alessandra Doria, F. DeNotaristefani, G. Landi, Joel Goldstein, J. Hirschfelder, P. Rosselet, F. Muheim, F. Behner, Stefano Giagu, G. S. Muanza, F. Ferroni, Y. Zeng, Jean Fay, P. Laurikainen, Igor Vorobiev, Joachim Mnich, P. Levtchenko, Panos A Razis, D. Boutigny, M. Schneegans, Bryan R. Smith, K. Sudhakar, Peter Denes, J. D. Swain, J. A. Rubio, N. Scholz, D. Peach, Nicolas Produit, R. Barillère, G. Ambrosi, P. L. de Guevara, Roger Moore, Y. J. Pei, Simone Paoletti, A. J.M. Muijs, Manjit Kaur, C. Dionisi, S. R. Hou, M. Wadhwa, D. J. Schotanus, Paolo Bagnaia, Dimitri Bourilkov, Manas Maity, P. Berges, Steve Nahn, G. Cara Romeo, B. P. Roe, S. P. Ahlen, P. Zemp, R. de Asmundis, I. Fisk, D. Kim, A. Favara, I. H. Park, Z. Z. Xu, C. H. Lin, V. Pojidaev, S. Reucroft, A. Robohm, A. Kunin, C. Cecchi, C. Palomares, A. Nippe, Alexander Malinin, A. Böhm, Georgi Sultanov, Fl Linde, T. S. Dai, R. A. Khan, Y. Karyotakis, Hafeez R Hoorani, Y. Uchida, M. von der Mey, J. B. Ye, Pablo Garcia-Abia, B. Borgia, R. Mount, J. Berdugo, E. J. Sanchez, W. Lu, Federico Cindolo, S. Villa, H. Milcent, M. Pohl, V. Soulimov, V. P. Andreev, A. Kasser, I. Vetlitsky, S. C. Tonwar, Howard A. Stone, G. Forconi, D.W. Schmitz, G. Pascale, P. de Jong, N. Shivarov, C. G. Yang, J. Pothier, Yu. Zalite, W. J. Metzger, H. K. Park, Alain Hervé, M. Chemarin, Francesca Cavallari, C. Leggett, Y. Zhou, P. Molnar, Lamberto Luminari, N. Cavallo, P. Spillantini, B. Petersen, E. Fiandrini, Gyorgy Vesztergombi, Luca Malgeri, Robert Clare, Jozsef Toth, Claudio Luci, G. Sauvage, W. G. Ma, Thomas Hebbeker, S. Goldfarb, W. C. van Hoek, Frank Filthaut, G. M. Chen, A. Barczyk, Thomas Ferguson, T. Moulik, G. Castellini, H. F. Chen, J. P. Martin, Aaron Dominguez, L. Taylor, M. P. Sanders, B. L. Betev, J. G. Branson, D. Pandoulas, M. W. Gruenewald, I. Josa-Mutuberria, Paul Lecoq, R. W. Kraemer, M. Napolitano, S. Petrak, Adrian Biland, D. Haas, An. Zalite, R. C. Ball, Felicitas Pauss, G. Y. Zhu, E. Shumilov, Pierre Lecomte, G. Gratta, Egidio Longo, Z. F. Gong, P. Bartalini, D. P. Stickland, F. Ziegler, Y. H. Chang, S. N. Ganguli, S. Rosier-Lees, D. Kamrad, D. H. Kim, V. Shoutko, P. Le Coultre, A. Bay, Maurizio Biasini, Marta Felcini, A. Degré, D. Duchesneau, H. S. Chen, L. Servoli, Gobinda Majumder, G. Chiefari, Marco Pieri, Werner Lustermann, Charles Timmermans, Kajari Mazumdar, Francesca Nessi-Tedaldi, S. Shevchenko, Roberto Battiston, Francesco Becattini, Harvey B Newman, S. Vlachos, W. Kittel, D. O. Prokofiev, G. Marian, A. C. Weber, J. D. Burger, T. Siedenburg, M. Rattaggi, Andrea Baschirotto, G. Rahal-Callot, G. Schwering, Carlo Civinini, X. D. Cai, Y. D. Oh, Pierluigi Paolucci, D. Mangeol, J. K. Kim, N. Raja, D. Luckey, J. Rodin, J. S. Kapustinsky, G. F. Susinno, T. Niessen, Jasper Kirkby, M. A. Falagan, A. Engler, Gerjan Bobbink, G. Raven, H. J. Yang, J. Ulbricht, C. Furetta, R. van Gulik, An.A. Vorobyov, D. Kiss, G. Mirabelli, P. Extermann, Salvatore Mele, M. Capell, H. Suter, Ia Iashvili, Christoph Schäfer, B. Z. Yang, H. Hofer, F. Cesaroni, K. L. Tung, F. C. Erné, M. Fabre, A. J.W. van Mil, K. Lübelsmeyer, H. S. Fesefeldt, E. Pistolesi, Mingming Yang, M. Aguilar-Benitez, S. Wynhoff, O. Adriani, L. J. Gutay, Anna Katharina Kopp, M. G. Alviggi, S. X. Wu, M. Chamizo, Zheng Wang, K. Freudenreich, U. Becker, A. Buffini, Zhenyu Zhang, S. Easo, Giovanni Passaleva, Kati Lassila-Perini, Herwig Schopper, V. Plyaskin, M. E. Sarakinos, Emilio Leonardi, R. Bock, I. Clare, D. Sciarrino, S. Sakar, M. Basile, C. Maña, M. T. Dova, I. C. Brock, I. Duran, A. Gougas, P. Payat, H. Postema, L. Baksay, F. Cotorobai, F. J. Eppling, L. W. Jones, M. Steuer, S. M. Ting, C. Li, K. Banicz, D. Perret-Gallix, U. K. Chaturvedi, R. Ostonen, A. Marin, A. Arefiev, G. M. Bilei, G. Carlino, J.V. Allaby, S. Patricelli, D. Hatzifotiadou, Laszlo Boldizsar, Pàl Hidas, S. Bhattacharya, K. Riles, Y. S. Lu, L. Z. Sun, F. Marzano, G. Coignet, W. Krenz, A. Shvorob, E. Valente, J. H. Field, G. Viertel, Hans J. Vogel, J. Schwenke, C. Y. Chien, A. Kirkby, S. Costantini, M. Campanelli, H. J. Lee, Marcella Diemoz, L. Cifarelli, B. Stoyanov, S. Schmidt-Kaerst, P. Marchesini, Samuel C.C. Ting, P. Duinker, I. Korolko, Simonetta Gentile, V. Brigljevic, A. Klimentov, B. De La Cruz, G. Hu, Speranza Falciano, G. Zilizi, P. Lebrun, M. Acciarri, Guo-Ming Chen, A. Chen, D. van Dierendonck, J. Salicio, M. Lebeau, Ren-Yuan Zhu, Luciano Barone, M. Pedace, T. van Rhee, A. Gurtu, B. Hartmann, A. Hasan, Raffaello D'Alessandro, Leonardo Merola, L. Tauscher, T. Azemoon, T. Paul, Marcos Cerrada, Y. Mi, Tariq Aziz, Yu. Galaktionov, J. Alcaraz, A. Mihul, G. Alemanni, W. W. Kinnison, S. C. Yeh, Crisostomo Sciacca, Konrad Deiters, Alberto Aloisio, L. Fredj, X. W. Tang, P. A. Piroué, B. Zhou, P. G. Rancoita, B. N. Jin, H. Nowak, W. Wallraff, S. Banerjee, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), CMS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), L3, Acciarri, M., Adriani, O., Aguilar Benitez, M., Ahlen, S., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, Alberto, Alviggi, Mariagrazia, Ambrosi, G., Anderhub, H., Andreev, V. P., Angelescu, T., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Baksay, L., Ball, R. C., Banerjee, S., Banicz, K., Barczyk, A., Barillere, R., Barone, L., Bartalini, P., Baschirotto, A., Basile, M., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Berdugo, J., Berges, P., Bertucci, B., Betev, B. L., Bhattacharya, S., Biasini, M., Biland, A., Bilei, G. M., Blaising, J. J., Blyth, S. C., Bobbink, G. J., Bock, R., Bohm, A., Boldizsar, L., Borgia, B., Bourilkov, D., Bourquin, M., Boutigny, D., Braccini, S., Branson, J. G., Brigljevic, V., Brock, I. C., Buffini, A., Buijs, A., Burger, J. D., Burger, W. J., Busenitz, J., Cai, X. D., Campanelli, M., Capell, M., Romeo, G. C., Carlino, G., Cartacci, A. M., Casaus, J., Castellini, G., Cavallari, F., Cavallo, N., Cecchi, C., Cerrada, M., Cesaroni, F., Chamizo, M., Chang, Y. H., Chaturvedi, U. K., Chemarin, M., Chen, A., Chen, G., Chen, G. M., Chen, H. F., Chen, H. S., Chen, M., Chiefari, Giovanni, Chien, C. Y., Cifarelli, L., Cindolo, F., Civinini, G., Clare, I., Clare, R., Coignet, G., Colijn, A. P., Colino, N., Costantini, S., Cotorobai, F., B. d., La, Csilling, A., Dai, T. S., D'Alessandro, R., Asmundis, R. d., Degre, A., Deiters, K., Denes, P., Denotaristefani, F., Diemoz, M., Dierendonck, D. v., Lodovico, F. D., Dionisi, C., Dittmar, M., Dominguez, A., Doria, A., Dova, M. T., Drago, E., Duchesneau, D., Duinker, P., Duran, I., Easo, S., Mamouni, H. E., Engler, A., Eppling, F. J., Erne, F. C., Extermann, P., Fabre, M., Faccini, R., Falagan, M. A., Falciano, S., Favara, A., Fay, J., Fedin, O., Felcini, M., Ferguson, T., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J. H., Filthaut, F., Fisher, P. H., Fisk, I., Forconi, G., Fredj, L., Freudenreich, K., Furetta, C., Galaktionov, Y., Ganguli, S. N., Garcia Abia, P., Gataullin, M., Gau, S. S., Gentile, S., Gerald, J., Gheordanescu, N., Giagu, S., Goldfarb, S., Goldstein, J., Gong, Z. F., Gougas, A., Gratta, G., Gruenewald, M. W., Gulik, R. v., Gupta, V. K., Gurtu, A., Gutay, L. J., Haas, D., Hartmann, B., Hasan, A., Hatzifotiadou, D., Hebbeker, T., Herve, A., Hidas, P., Hirschfelder, J., Van, W. C., Hofer, H., Hoorani, H., Hou, S. R., Hu, G., Iashvili, I., Jin, B. N., Jones, L. W., Jong, P. d., Josa Mutuberria, I., Kasser, A., Khan, R. A., Kamrad, D., Kapustinsky, J. S., Karyotakis, Y., Kaur, M., Kienzle Focacci, M. N., Kim, D., Kim, D. H., Kim, J. K., Kim, S. C., Kinnison, W. W., Kirkby, A., Kirkby, D., Kirkby, J., Kiss, D., Kittel, W., Klimentov, A., Konig, A. C., Kopp, A., Korolko, I., Koutsenko, V., Kraemer, R. W., Krenz, W., Kunin, A., Lacentre, P., P. L., De, Landi, G., Lapoint, C., Lassila Perini, K., Laurikainen, P., Lavorato, A., Lebeau, M., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Coultre, P. L., Lee, H. J., Leggett, C., J. M., Le, Leiste, R., Leonardi, E., Levtchenko, P., Li, C., Lin, C. H., Lin, W. T., Linde, F. L., Lista, L., Liu, Z. A., Lohmann, W., Longo, E., Lu, W., Y. S., Lu, Lubelsmeyer, K., Luci, C., Luckey, D., Luminari, L., Lustermann, W., W. G., Ma, Maity, M., Majumder, G., Malgeri, L., Malinin, A., Mana, C., Mangeol, D., Marchesini, P., Marian, G., Marin, A., Martin, J. P., Marzano, F., G. G. G., Mazumdar, K., Mele, S., Merola, Leonardo, Meschini, M., Metzger, W. J., Der, M. v., Mi, Y., Migani, D., Mihul, A., A. J. W., Milcent, H., Mirabelli, G., Mnich, J., Molnar, P., Monteleoni, B., Moore, R., Moulik, T., Mount, R., Muanza, G. S., Muheim, F., A. J. M., Nahn, S., Napolitano, Marco, Nessi Tedaldi, F., Newman, H., Niessen, T., Nippe, A., Nisati, A., Nowak, H., Y. D., Oh, Organtini, G., Ostonen, R., Palomares, C., Pandoulas, D., Paoletti, S., Paolucci, P., Park, H. K., Park, I. H., Pascale, G., Passaleva, G., Patricelli, Sergio, Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Peach, D., Pedace, M., Pei, Y. J., Pensotti, S., Perret Gallix, D., Petersen, B., Petrak, S., Pevsner, A., Piccolo, D., Pieri, M., Piroue, P. A., Pistolesi, E., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Pothier, J., Produit, N., Prokofiev, D., Quartieri, J., Rahal Callot, G., Raja, N., Rancoita, P. G., Rattaggi, M., Raven, G., Razis, P., Ren, D., Rescigno, M., Reucroft, S., Rhee, T. v., Riemann, S., Riles, K., Rind, O., Robohm, A., Rodin, J., Roe, B. P., Romero, L., Rosier Lees, S., Rosselet, P., Roth, S., Rubio, J. A., Ruschmeier, D., Rykaczewski, H., Sakar, S., Salicio, J., Sanchez, E., Sanders, M. P., Sarakinos, M. E., Sauvage, G., Schafer, C., Schegelsky, V., Schmidt Kaerst, S., Schmitz, D., Schneegans, M., Scholz, N., Schopper, H., Schotanus, D. J., Schwenke, J., Schwering, G., Sciacca, Crisostomo, Sciarrino, D., Servoli, L., Shevchenko, S., Shivarov, N., Shoutko, V., Shukla, J., Shumilov, E., Shvorob, A., Siedenburg, T., Son, D., Soulimov, V., Smith, B., Spillantini, P., Steuer, M., Stickland, D. P., Stone, H., Stoyanov, B., Straessner, A., Sudhakar, K., Sultanov, G., Sun, L. Z., Susinno, G. F., Suter, H., Swain, J. D., Tang, X. W., Tauscher, L., Taylor, L., Timmermans, C., S. C. C., Ting, S. M., Tonwar, S. C., Toth, J., Tully, C., Tung, K. L., Uchida, Y., Ulbricht, J., Valente, E., Vesztergombi, G., Vetlitsky, I., Viertel, G., Villa, S., Vivargent, M., Vlachos, S., Vogel, H., Vogt, H., Vorobiev, I., Vorobyov, A. A., Vorvolakos, A., Wadhwa, M., Wallraff, W., Wang, J. C., Wang, X. L., Wang, Z. M., Weber, A., S. X., Wu, Wynhoff, S., Xu, J., Z. Z., Xu, Yang, B. Z., Yang, C. G., Yang, H. J., Yang, M., J. B., Ye, Yeh, S. C., You, J. M., Zalite, A., Zalite, Y., Zemp, P., Zeng, Y., Zhang, Z. P., Zhou, B., Zhou, Y., Zhu, G. Y., Zhu, R. Y., Zichichi, A., Ziegler, F., Zilizi, G., IHEF (IoP, FNWI), and L3 (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, LUND MONTE-CARLO, Electron–positron annihilation, Hadron, AVERAGE LIFETIME, PRECISION-MEASUREMENT, OSCILLATION FREQUENCY, MIXING PARAMETER, 01 natural sciences, B-HADRON LIFETIME, JET FRAGMENTATION, Nuclear physics, Rate difference, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Limit (mathematics), 010306 general physics, Z-DECAYS, L3 EXPERIMENT, Physics, 010308 nuclear & particles physics, SEMILEPTONIC DECAYS, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

An upper limit on the lifetime difference of short- and long-lived $\rm B^0_s$ mesons has been obtained using an inclusive bottom hadron sample from 2 million hadronic Z decays collected by the L3 experiment at LEP. A lifetime fit has been performed on data samples separately enriched in neutral and charged b hadrons. An experimental upper limit on the decay rate difference of short- and long-lived $\rm B^0_s$ mesons of \begin{displaymath} ~~~~ {\rm (|\Delta\Gamma|/\Gamma)_{B^0_s}} < 0.67 ~~~~~~~\mathrm{(95\% \; C.L.)} \end{displaymath} has been determined. In addition, the lifetimes of $\rm B^+$ and $\rm B^0_d$ mesons have been measured to be $\tau(\rm B^+) = 1.66 \pm 0.06 \, \pm 0.03 \; \mathrm{ps}$ and $\tau(\rm B^0_d) = 1.52 \pm 0.06 \, \pm 0.04 \; \mathrm{ps}$, where the first errors are statistical and the second are systematic.

Published
1998
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9. Mach-Zehnder Interferometry at the Heisenberg Limit with Coherent and Squeezed-Vacuum Light

Author

Luca Pezzè and Augusto Smerzi

Subjects
Physics, Quantum Physics, Phase (waves), FOS: Physical sciences, General Physics and Astronomy, PRECISION-MEASUREMENT, State (functional analysis), Mach–Zehnder interferometer, Upper and lower bounds, NOISE, QUANTUM LIMITS, Condensed Matter - Other Condensed Matter, PHASE MEASUREMENTS, Amplitude, STATES, Quantum mechanics, Coherent states, Heisenberg limit, Sensitivity (control systems), Quantum Physics (quant-ph), Other Condensed Matter (cond-mat.other)
Abstract

We show that the phase sensitivity $\Delta \theta$ of a Mach-Zehnder interferometer fed by a coherent state in one input port and squeezed-vacuum in the other one is i) independent from the true value of the phase shift and ii) can reach the Heisenberg limit $\Delta \theta \sim 1/N_T$, where $N_T$ is the average number of particles of the input states. We also show that the Cramer-Rao lower bound, $\Delta \theta \propto 1/ \sqrt{|\alpha|^2 e^{2r} + \sinh^2r}$, can be saturated for arbitrary values of the squeezing parameter $r$ and the amplitude of the coherent mode $|\alpha|$ by a Bayesian phase inference protocol., Comment: 4 pages, 4 figures

Published
2008
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10. Experiments with longitudinally polarized electrons in a storage ring, using a Siberian snake

Author

F. Kroes, R. Ent, H. J. Bulten, G. Luijckx, J. F. J. van den Brand, M. Ferro-Luzzi, M. Harvey, E. Six, H. de Vries, M. J. J. van den Putte, P.W. van Amersfoort, H. Boer Rookhuizen, Igor Nesterenko, Yu. M. Shatunov, D. Boersma, J.G. Noomen, B. E. Norum, B. L. Militsyn, Ivan Koop, Ricardo Alarcon, J. J. M. Steijger, H. R. Poolman, P. Klimin, L.D. van Buuren, J. van der Laan, C. W. de Jager, D. Geurts, A. P. Lysenko, Th. S. Bauer, P. Heimberg, Dominik Szczerba, Igor Passchier, D. W. Higinbotham, and (Astro)-Particles Physics

Subjects
INTERNAL TARGET, Nuclear Theory, General Physics and Astronomy, Electron, PRECISION-MEASUREMENT, 01 natural sciences, 7. Clean energy, ENERGY, Helium-3, 0103 physical sciences, Neutron, STRUCTURE-FUNCTION G(1)(N), 010306 general physics, Nuclear Experiment, Isotopes of helium, HE-3, Physics, 010308 nuclear & particles physics, Scattering, Polarization (waves), QUASI-ELASTIC SCATTERING, Charged particle, NEUTRON SPIN STRUCTURE, Physics::Accelerator Physics, Atomic physics, Storage ring
Abstract

We report on first measurements with polarized electrons stored in a medium-energy ring and with a polarized internal target. Polarized electrons were injected at 442 MeV (653 MeV), and a partial (full) Siberian snake was employed to preserve the polarization. Longitudinal polarization at the interaction point and polarization lifetime of the stored electrons were determined with laser backscattering. Spin observables were measured for electrodisintegration of polarized He-3, with simultaneous detection of scattered electrons, protons, neutrons, deuterons, and He-3 nuclei, over a large phase space.

Published
2000
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11. Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering

Author

Ackerstaff, K., Airapetian, A., Akopov, N., Akushevich, I., Amarian, M., Aschenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Bains, B., Barrow, S., Baumgarten, C., Beckmann, M., Belostotski, S., Belz, J. E., Benisch, T., Bernreuther, S., Bianchi, N., Blanchard, S., Blouw, J., Böttcher, H., Borissov, A., Brack, J., Bray, B., Brauksiepe, S., Braun, B., Brons, S., Brückner, W., Brüll, A., Bruins, E. E. W., Bulten, H. J., Cadman, R. V., Capitani, G. P., Carter, P., Chumney, P., Cisbani, E., Court, G. R., Dalpiaz, P. F., Leo, R., Delheij, P. P. J., Sanctis, E., Schepper, D., Devitsin, E., Witt Huberts, P. K. A., Di Nezza, P., Düren, M., Dvoredsky, A., Ely, J., Elbakian, G., Emerson, J., Fantoni, A., Fechtchenko, A., Ferstl, M., Fick, D., Fiedler, K., Filippone, B. W., Fischer, H., Fortune, H. T., Fox, B., Frabetti, S., Franz, J., Frullani, S., Funk, M. -A, Gagunashvili, N. D., Galumian, P., Gao, H., Gärber, Y., Garibaldi, F., Gavrilov, G., Geiger, P., Gharibyan, V., Golendukhin, A., Graw, G., Grebeniouk, O., Green, P. W., Greeniaus, L. G., Grosshauser, C., Guidal, M., Gute, A., Gyurjyan, V., Haas, J. P., Haeberli, W., Hansen, J. -O, Hasch, D., Häusser, O., Henderson, R., Heinsius, F. H., Henkes, T., Henoch, M., Hertenberger, R., Holler, Y., Holt, R. J., Hoprich, W., Ihssen, H., Iodice, M., Izotov, A., Jackson, H. E., Jgoun, A., Jones, C., Kaiser, R., Kestel, M., Kinney, E., Kirsch, M., Kisselev, A., Kitching, P., Kobayashi, H., Koch, N., Königsmann, K., Kolstein, M., Kolster, H., Korotkov, V., Korsch, W., Kozlov, V., Kramer, L. H., Krause, B., Krivokhijine, V. G., Kückes, M., Kümmell, F., Kurisuno, M., Kyle, G., Lachnit, W., Lorenzon, W., Lung, A., Makins, N. C. R., Martens, F. K., Martin, J. W., Marukyan, H., Masoli, F., Mateos, A., Maul, M., Mcandrew, M., Mcilhany, K., Mckeown, R. D., Meissner, F., Menden, F., Mercer, D., Metz, A., Meyners, N., Mikloukho, O., Miller, C. A., Miller, M. A., Milner, R., Mitsyn, V., Most, A., Mozzetti, R., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nathan, A. M., Neunreither, F., Niczyporuk, J. M., Nowak, W. -D, Nupieri, M., Oelwein, P., Ogami, H., O Neill, T. G., Openshaw, R., Owen, B. R., Ouyang, J., Papavassiliou, V., Pate, S. F., Pitt, M., Poolman, H. R., Potashov, S., Potterveld, D. H., Rakness, G., Reali, A., Redwine, R., Reolon, A. R., Ristinen, R., Rith, K., Röper, G., Rossi, P., Rudnitsky, S., Ruh, M., Ryckbosch, D., Sakemi, Y., Savin, I., Scarlett, C., Schafer, A., Schmidt, F., Schmitt, H., Schnell, G., Schüler, K. P., Schwind, A., Seibert, J., Shibata, T. -A, Shibatani, K., Shin, T., Shutov, V., Simani, C., Simon, A., Sinram, K., Slavich, P., Smythe, W. R., Sowinski, J., Spengos, M., Steffens, E., Stenger, J., Stewart, J., Stock, F., Stoesslein, U., Sutter, M., Tallini, H., Taroian, S., Terkulov, A., Thiessen, D. M., Tipton, B., Thomas, E., Trudel, A., Michael Tytgat, Urciuoli, G. M., Hunen, J. J., Vyver, R., Den Brand, J. F. J., Steenhoven, G., Vetterli, M. C., Vikhrov, V., Vincter, M., Visser, J., Volk, E., Wander, W., Welch, T. P., Wendland, J., Williamson, S. E., Wise, T., Woller, K., Yoneyama, S., Zapfe, K., Zohrabian, H., and Zurmühle, R.

Subjects
Quark, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Lattice, Hadron, FOS: Physical sciences, Down quark, PRECISION-MEASUREMENT, SUM-RULE, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), MUON-PROTON-SCATTERING, ASYMMETRIES, 0103 physical sciences, STRUCTURE-FUNCTION G(1)(N), 010306 general physics, HE-3, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Lattice QCD, Deep inelastic scattering, SPIN STRUCTURE-FUNCTION, DEUTERON, GLOBAL ANALYSIS, PARTON DISTRIBUTIONS, Isospin, Up quark, High Energy Physics::Experiment, Nucleon
Abstract

Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized positrons on polarized hydrogen and 3He targets, in the kinematic range 0.023, Comment: 14 pages, 6 figures (eps format), 10 tables in Latex New version contains tables of asymmetries and correlation matrix

12. Measurement of the average lifetime of b-hadrons in Z decays

Author

F. Ferroni, Gian Mario Bilei, B. Petersen, Gyorgy Vesztergombi, Luca Malgeri, E. Valente, D. McNally, G. Schwering, J. M. Le Goff, Samuel C.C. Ting, P. Duinker, A. Kasser, I. Korolko, F. Di Lodovico, J. Alcaraz, E. Longo, M. Pauluzzi, A. Klimentov, G. Sauvage, D. Schmitz, H. O. Cohn, K. Jenkes, Y. Uchida, Kenneth Francis Read, I. Duran, P. Extermann, W. Kittel, Salvatore Mele, P. Lecomte, Christoph Schäfer, B. Z. Yang, M. Lebeau, J. P. Ernenwein, J.V. Allaby, Davide Piccolo, J. Schwenke, Harvey B Newman, M. P. Sanders, D. Hatzifotiadou, J. Rodin, H. Opitz, Laszlo Boldizsar, C. Furetta, Luciano Barone, A. Kunin, A. Degré, E. Fiandrini, S. Costantini, W. van Rossum, P. H. Fisher, S. V. Chekanov, S. C. Blyth, P. G. Rancoita, Oleg Fedin, R. Leiste, A. Mihul, Christoph Paus, L. Fredj, S. Gentile, W. Lu, G. Alemanni, S. Banerjee, Zp Zhang, P. Denes, Gianpaolo Carlino, Hafeez R Hoorani, P. Marchesini, T. van Rhee, A. Barczyk, M. Rattaggi, Federico Cindolo, G. Forconi, Tariq Aziz, Y. J. Pei, W. Wallraff, W. W. Kinnison, S. C. Yeh, S. Mangla, V. Brigljevic, F. C. Erné, B. De La Cruz, Y. Galaktionov, K. Sudhakar, M. Vivargent, V. K. Gupta, S. Goldfarb, B. Monteleoni, M. Rescigno, B. Fenyi, H. Milcent, J. A. Rubio, H. Anderhub, J. S. Kapustinsky, F. Marzano, Marco Pieri, A. Biland, I. C. Brock, R. T. Van de Walle, B. Hartmann, G. Gratta, Y. S. Lu, A. Engler, Y. Zhou, P. Bartalini, F. J. Eppling, W. C. van Hoek, X. W. Tang, Frank Filthaut, M. W. Gruenewald, I. Josa-Mutuberria, S. C. Kim, Konrad Deiters, Joel Goldstein, G. Cara Romeo, F. L. Linde, Gobinda Majumder, A. Hasan, Alberto Aloisio, A. Weber, Y. Kamyshkov, Raffaello D'Alessandro, Thomas Ferguson, C. Cecchi, H. S. Fesefeldt, E. Pistolesi, A. Favara, I. H. Park, S. Braccini, Subir Sarkar, C. H. Lin, F. Muheim, Howard A. Stone, T.S. Dai, P. A. Piroué, G. Viertel, B. Zhou, S. Patricelli, K. Freudenreich, H. Hofer, V. Pojidaev, M. Napolitano, S. Pensotti, T. Moulik, G. Chiefari, P. Bagnaia, Pierluigi Paolucci, A. A. Vorobyov, L. Tauscher, M. Campanelli, A. Zichichi, David Stickland, A. Lebedev, Vladimir Andreev, P. Zemp, Dong-Chul Son, C. Y. Chien, I. Fisk, S. Reucroft, D. Ruschmeier, S. J. Hong, C. Lapoint, T. Azemoon, M. Pohl, J. M. You, S. Easo, Roberto Battiston, J. J. Blaising, H. J. Lee, Stefano Giagu, C. Sciacca, C. Palomares, D. Kim, V. Plyaskin, S. M. Ting, A. Straessner, A. Arefiev, J. K. Kim, Yu. Efremenko, Giovanni Passaleva, Luca Lista, Marcella Diemoz, C. Maña, Marcos Cerrada, Y. Mi, L. Cifarelli, B. Borgia, M. T. Dova, B. N. Jin, M. Capell, Kati Lassila-Perini, Mariagrazia Alviggi, D. Fernandez, S. S. Gau, M. Acciarri, Guo-Ming Chen, J. Ulbricht, F. DeNotaristefani, F. Ziegler, Axel König, U. Uwer, E. Drago, James G Branson, Juven Wang, I. Vetlitsky, D. van Dierendonck, J. Salicio, Willis Lin, G. Landi, Marco Meschini, I. Clare, J. Busenitz, R. Y. Zhu, D. Kirkby, W. J. Metzger, W. Krenz, S. X. Wu, A. Shvorob, Christopher George Tully, D. DiBitonto, Ph. Rosselet, V. Soulimov, V. Koutsenko, A. Kirkby, C. Li, B. Stoyanov, Wolfgang Lohmann, H. Vogt, B. Bertucci, M. Steuer, M. Schneegans, S. Schmidt-Kaerst, K. Banicz, D. Perret-Gallix, F. Anselmo, Nicanor Colino, G. F. Susinno, Bryan R. Smith, M. Bourquin, Manas Maity, K. Riles, H. Nowak, M. von der Mey, Joachim Mnich, M. Fabre, J. B. Ye, R. Barillère, S. Roth, Zheng Wang, A. Robohm, Suresh C Tonwar, A. Gurtu, Zhenyu Zhang, P. Berges, Steve Nahn, D. J. Schotanus, D. O. Prokofiev, A.M. Cartacci, B. L. Betev, K. L. Tung, Francesca Nessi-Tedaldi, Jasper Kirkby, X. D. Cai, M. E. Sarakinos, A. J.W. van Mil, Anna Katharina Kopp, K. Strauch, P. Ladron de Guevara, G. Hu, A. Gougas, M. N. Kienzle-Focacci, T. Siedenburg, G. Rahal-Callot, H. Tuchscherer, N. Raja, A. Csilling, G. J. Bobbink, V. Schegelsky, Maurizio Biasini, H. Suter, S. Falciano, Marta Felcini, R. Mount, Y. Zeng, H. K. Park, G. Castellini, J. Berdugo, Yongsun Kim, Z. F. Gong, J. D. Burger, Francesco Becattini, R. W. Kraemer, Y. D. Oh, U. K. Chaturvedi, P. Lebrun, S. Wynhoff, A. Nippe, T. Paul, P. Molnar, George Alverson, W.G. Ma, T. Niessen, L. J. Gutay, An. Zalite, C. G. Yang, D. Kamrad, Z. Z. Xu, S. Shevchenko, F. Behner, Andrea Baschirotto, Alessandra Doria, N. Scholz, S. R. Hou, M. Wadhwa, J. Tóth, O. Adriani, Lucas Taylor, T. Angelescu, J. Casaus, P. Lacentre, P. Laurikainen, Z. A. Liu, A. Vorvolakos, X. Y. Yao, J. G. Xu, S. Ahlen, N. Gheordanescu, Yu. Zalite, F. Cesaroni, M. Chamizo, Emilio Leonardi, R. Bock, D. Sciarrino, R. A. Khan, L. Baksay, F. Cotorobai, Helmut Vogel, G. Ambrosi, S. Riemann, Roger Moore, Georgi Sultanov, X. L. Wang, M. Chemarin, N. Cavallo, H.F. Chen, R. de Asmundis, G. M. Chen, L. Luminari, S. Morganti, Aleandro Nisati, K. Lübelsmeyer, O. Rind, Simone Paoletti, A. Buffini, Aaron Dominguez, Suchandra Dutta, D. Pandoulas, Felicitas Pauss, Pablo Garcia-Abia, A. J.M. Muijs, Alain Hervé, A. Bay, Carlo Civinini, G. Raven, G. G.G. Massaro, M. Aguilar-Benitez, Herwig Schopper, S. Rosier-Lees, H. 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Subjects
Nuclear and High Energy Physics, Particle physics, E+E ANNIHILATION, LUND MONTE-CARLO, Electron–positron annihilation, Hadron, PRECISION-MEASUREMENT, ddc:500.2, Z decays, 01 natural sciences, High momentum, JET FRAGMENTATION, Nuclear physics, PHYSICS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], PARTICLES, Combined result, 010306 general physics, Nuclear Experiment, Ciencias Exactas, L3 EXPERIMENT, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Física, colider LEP, Vertex (geometry), Transverse momentum, b-hadron lifetime, High Energy Physics::Experiment, HEAVY QUARKS, Impact parameter, Particle Physics - Experiment, Lepton
Abstract

We present a measurement of the average b-hadron lifetime t at the eqey collider LEP. Using hadronic Z decays b collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of t using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is τb=[1549±9(stat)±15(syst)]fs. In addition, we measure the average charged b-decay multiplicity 〈nb〉and the normalized average b-energy 〈xE〉b at LEP to be 〈nb〉=4.90±0.04(stat)±0.11(syst),〈xE〉b=0.709±0.004(stat+syst)., Facultad de Ciencias Exactas

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