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| High Energy Physics - Experiment : Determination of $eta opi^+pi^-pi^0$ Dalitz plot slopes and asymmetries with the KLOE detector |
| arXiv:0801.2642 (January 2008) | | Determination of $eta opi^+pi^-pi^0$ Dalitz plot slopes and asymmetries with the KLOE detector | | The KLOE Collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocchetta, F. Bossi, P. Branchini, R. Caloi, P. Campana, G. Capon, T. Capussela, F. Ceradini, F. Cesario, S. Chi, G. Chiefari, P. Ciambrone, F. Crucianelli, E. De Lucia, A. De Santis, P. De Simone, G. De Zorzi, A. Denig, A. Di Domenico, C. Di Donato, B. Di Micco, A. Doria, M. Dreucci, G. Felici, A. Ferrari, M. L. Ferrer, S. Fiore, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, E. Graziani, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, M. Martini, P. Massarotti, W. Mei, S. Meola, S. Miscetti, M. Moulson, S. Müller, F. Murtas, M. Napolitano, F. Nguyen, M. Palutan, E. Pasqualucci, A. Passeri, V. Patera, F. Perfetto, M. Primavera, P. Santangelo, G. Saracino, B. Sciascia, A. Sciubba, A. Sibidanov, T. Spadaro, M. Testa, L. Tortora, P. Valente, G. Venanzoni, R. Versaci and G. Xu | | Received. 17 January 2008 Last updated. 10 March 2008 | | Abstract. We have studied, with the KLOE detector at the DA$Phi$NE $Phi$-Factory, the dynamics of the decay $eta opi^+pi^-pi^0$ using $eta$ mesons from the decay $phi oetagamma$ for an integrated luminosity ${mathcal L}$ = 450 pb$^{-1}$. From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. An alternative parametrization relates the $pi^+pi^-pi^0$ slopes to that for $eta o 3pi^0$ showing the consistency of KLOE results for both channels. We also obtain the best confirmation of the $C$-invariance in the $eta opi^+pi^-pi^0$ decay. | | Categories. hep-ex | | Comment. 15 pages, 7 figures |
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| High Energy Physics - Experiment : First Measurement of the Production of a W Boson in Association with a Single Charm Quark in Proton Anti-proton Collisions at sqrt(s)=1.96 TeV |
| arXiv:0711.2901 (November 2007) | | First Measurement of the Production of a W Boson in Association with a Single Charm Quark in Proton Anti-proton Collisions at sqrt(s)=1.96 TeV | | CDF Collaboration and T. Aaltonen | Istituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore, I-56127 Pisa, Italy
Argonne National Laboratory, Argonne, Illinois 60439
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Fermi National Accelerator Laboratory, Batavia, Illinois 60510
Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
Michigan State University, East Lansing, Michigan 48824
Waseda University, Tokyo 169, Japan
Institute of Particle Physics: McGill University, Montréal, Canada H3A 2T8, and University of Toronto, Toronto, Canada M5S 1A7
Northwestern University, Evanston, Illinois 60208
Purdue University, West Lafayette, Indiana 47907
Glasgow University, Glasgow G12 8QQ, United Kingdom
Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
Duke University, Durham, North Carolina 27708
Istituto Nazionale di Fisica Nucleare, University of Trieste/ Udine, Italy
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720
University of California, Santa Barbara, Santa Barbara, California 93106
Tufts University, Medford, Massachusetts 02155
Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, E-28040 Madrid, Spain
University of California, Los Angeles, Los Angeles, California 90024
Yale University, New Haven, Connecticut 06520
Brandeis University, Waltham, Massachusetts 02254
University of Liverpool, Liverpool L69 7ZE, United Kingdom
Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University of Rome "La Sapienza," I-00185 Roma, Italy
University of Wisconsin, Madison, Wisconsin 53706
University of Florida, Gainesville, Florida 32611
Harvard University, Cambridge, Massachusetts 02138
Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
University of Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
Wayne State University, Detroit, Michigan 48201
University of Tsukuba, Tsukuba, Ibaraki 305, Japan
Texas A&M University, College Station, Texas 77843
The Rockefeller University, New York, New York 10021
Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
Comenius University, 842 48 Bratislava, Slovakia, Institute of Experimental Physics, 040 01 Kosice, Slovakia
Center for High Energy Physics: Kyungpook National University, Daegu 702-701, Korea, Seoul National University, Seoul 151-742, Korea, Sungkyunkwan University, Suwon 440-746, Korea, Korea Institute of Science and Technology Information, Daejeon, 305-806, Korea, Chonnam National University, Gwangju, 500-757, Korea
University of Rochester, Rochester, New York 14627
University College London, London WC1E 6BT, United Kingdom
Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
University of Oxford, Oxford OX1 3RH, United Kingdom
LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France
University of California, Davis, Davis, California 95616
University of California, San Diego, La Jolla, California 92093
Okayama University, Okayama 700-8530, Japan
Osaka City University, Osaka 588, Japan
University of Illinois, Urbana, Illinois 61801
University of Pittsburgh, Pittsburgh, Pennsylvania 15260
Carnegie Mellon University, Pittsburgh, PA 15213
University of Geneva, CH-1211 Geneva 4, Switzerland
Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
University of New Mexico, Albuquerque, New Mexico 87131
Rutgers University, Piscataway, New Jersey 08855
University of Pennsylvania, Philadelphia, Pennsylvania 19104
University of Michigan, Ann Arbor, Michigan 48109
The Johns Hopkins University, Baltimore, Maryland 21218
The Ohio State University, Columbus, Ohio 43210
Baylor University, Waco, Texas 76798
| | Received. 19 November 2007 Last updated. 10 March 2008 | | Abstract. We present the first measurement of the production cross section of a W boson with a single charm quark (c) in p-pbar collisions at sqrt(s)=1.96 TeV, using soft muon tagging of c jets. In a data sample of ~1.8 fb-1, recorded with the CDF II detector at the Fermilab Tevatron, we select events with W+1 or 2 jets. We use the charge correlation between the W and the muon from the semileptonic decay of a charm hadron to extract the Wc signal. We measure sigma_{Wc}(p_{Tc}>20 GeV/c, |eta_c|<1.5) imes BR(W->ellu) = 9.8+/-3.2 pb, in agreement with theoretical expectations. | | Categories. hep-ex | | Comment. 7 pages, 1 figure. Submitted to Phys. Rev. Lett |
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| High Energy Physics - Experiment : Simultaneous measurement of the ratio B(t->Wb)/B(t->Wq) and the top quark pair production cross section with the D0 detector at sqrt(s)=1.96 TeV |
| arXiv:0801.1326 (January 2008) | | Simultaneous measurement of the ratio B(t->Wb)/B(t->Wq) and the top quark pair production cross section with the D0 detector at sqrt(s)=1.96 TeV | | D0 Collaboration, V. Abazov and et al | | Received. 08 January 2008 Last updated. 08 January 2008 | | Abstract. We present the first simultaneous measurement of the ratio of branching fractions, R=B(t->Wb)/B(t->Wq), with q being a d, s, or b quark, and the top quark pair production cross section sigma_ttbar in the lepton plus jets channel using 0.9 fb-1 of ppbar collision data at sqrt(s)=1.96 TeV collected with the D0 detector. We extract R and sigma_ttbar by analyzing samples of events with 0, 1 and >= 2 identified b jets. We measure R = 0.97 +0.09-0.08 (stat+syst) and sigma_ttbar = 8.18 +0.90-0.84 (stat+syst)} +/-0.50 (lumi) pb, in agreement with the standard model prediction. | | Categories. hep-ex | | Comment. submitted to Phys.Rev.Letters | | Report No. FERMILAB-PUB-08-010-E |
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| High Energy Physics - Experiment : Study of W boson polarisations and Triple Gauge boson Couplings in the reaction e+e- -> W+W- at LEP 2 |
| arXiv:0801.1235 (January 2008) | | Study of W boson polarisations and Triple Gauge boson Couplings in the reaction e+e- -> W+W- at LEP 2 | | The DELPHI Collaboration, J. Abdallah and et al | | Received. 08 January 2008 Last updated. 08 January 2008 | | Abstract. A determination of the single W Spin Density Matrix (SDM) elements in the reaction e+e- -> W+W- -> l nu q qbar (l=e/mu) is reported at centre-of-mass energies between 189 and 209 GeV. The data sample used corresponds to an integrated luminosity of 520 pb^{-1} taken by DELPHI between 1998 and 2000. The single W SDM elements, rho_{tau tau'}^{W+-} (tau,tau' = +/-1 or 0), are determined as a function of the W- production angle with respect to the e- beam direction and are obtained from measurements of the W decay products by the application of suitable projection operators, Lambda_{tau tau'}, which assume the V-A coupling of the W boson to fermions. The measured SDM elements are used to obtain the fraction of longitudinally polarised Ws, with the result: sigma_L/sigma_tot = 24.9 +/- 4.5(stat) +/- 2.2(syst) % at a mean energy of 198 GeV. The SDM elements are also used to determine the Triple Gauge Couplings Delta g_1^Z, Delta kappa_gamma, lambda_gamma and g_4^Z, ~kappa_Z and ~lambda_Z. For the CP-violating couplings the results of single parameter fits are: g_4^Z = -0.39 +0.19 -0.20 ~kappa_Z = -0.09 +0.08 -0.05 ~lambda_Z = -0.08 +/- 0.07 . The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model. | | Categories. hep-ex | | Comment. 34 pages, 17 figures, Accepted by Eur. Phys. J. C | | Report No. CERN-PH-EP/2007-036 |
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| High Energy Physics - Experiment : Prospects for $phi$ meson production in pp collisions at the ALICE experiment |
| arXiv:0801.1152 (January 2008) | | Prospects for $phi$ meson production in pp collisions at the ALICE experiment | | J. D. Tapia Takaki | Particle Physics Group, School of Physics and Astronomy, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | Received. 08 January 2008 Last updated. 08 January 2008 | | Abstract. The ALICE experiment at the CERN Large Hadron Collider (LHC) will allow the study of resonance production in nucleus-nucleus and proton-proton collisions. This paper presents results based on physics performance studies to discuss prospects in ALICE for $phi$(1020) meson production in pp interactions during the LHC startup. | | Categories. hep-ex | | Comment. To appear in the proceedings of International Conference on Strangeness in Quark Matter (SQM 2007), Levoca, Slovakia, 24-29 Jun 2007. Submitted to J.Phys.G |
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| High Energy Physics - Experiment : Strategy for early SUSY searches at ATLAS |
| arXiv:0710.3953 (October 2007) | | Strategy for early SUSY searches at ATLAS | | Shimpei Yamamoto and the ATLAS Collaboration | International Center for Elementary Particle Physics, the University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | Received. 21 October 2007 Last updated. 08 January 2008 | | Abstract. The CERN Large Hadron Collider (LHC) is scheduled to commence operation in 2008 and inclusive searches for supersymmetry (SUSY) will be one of our primary tasks in the first days of LHC operation. It is certain that the final state of multijets + missing transverse energy will provide a superior performance in SUSY searches. Strategies to understand the instrumental background and to understand the Standard Model (SM) background are still under development and are urgent issues for the coming data. We describe the strategy for early SUSY searches at the ATLAS experiment using the fist data corresponding to an integrated luminosity up to 1fb^-1, which comprises much progress in the data-driven technique for the SM background estimations. | | Categories. hep-ex | | Comment. Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 8 eps figures |
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| High Energy Physics - Experiment : D and Ds hadronic branching fractions at B factories |
| arXiv:0711.4769 (November 2007) | | D and Ds hadronic branching fractions at B factories | | Marco Pappagallo | University of Bari and I.N.F.N., 70126 Bari, Italy
| | Received. 29 November 2007 Last updated. 29 November 2007 | | Abstract. Recent measurements of hadronic branching fractions of D and Ds mesons, performed by the BaBar and Belle experiments at the asymmetric e+e- B factories colliders PEP II and KEKB, are reviewed. | | Categories. hep-ex | | Comment. To be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C070805 |
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| High Energy Physics - Experiment : Beam spin asymmetry in deep and exclusive pi0 electroproduction |
| arXiv:0711.4736 (November 2007) | | Beam spin asymmetry in deep and exclusive pi0 electroproduction | | R. De Masi and the CLAS Collaboration | ØHIOU
RICE
JLAB
ITEP
ØRSAY
ANL
ISU
KYUNGPOOK
VIRGINIA
CUA
INFNFR
SCAROLINA
RPI
CSU
ØDU
UCLA
CMU
ECOSSEG
YEREVAN
LPC
GWU
FSU
UCONN
UMASS
SACLAY
ECOSSEE
CNU
INFNGE
ASU
LPSC
MOSCOW
FIU
UNH
NSU
JMU
UNIONC
URICH
| | Received. 29 November 2007 Last updated. 29 November 2007 | | Abstract. The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin(phi) function and their amplitudes are extracted. Overall, they are of the order of 0.04 - 0.11 and roughly independent of t. This is the signature of a non-zero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed. | | Categories. hep-ex | | Comment. 5 pages, 6 figures |
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| High Energy Physics - Experiment : Observation of the Decay B+ --> K+K-pi+ |
| arXiv:0708.0376 (August 2007) | | Observation of the Decay B+ --> K+K-pi+ | | The BABAR Collaboration, B. Aubert and et al | Iowa State University, Ames, Iowa 50011-3160, USA
University of Iowa, Iowa City, Iowa 52242, USA
Università di Roma La Sapienza, Dipartimento di Fisica and INFN, I-00185 Roma, Italy
Colorado State University, Fort Collins, Colorado 80523, USA
University of Tennessee, Knoxville, Tennessee 37996, USA
Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany
Yale University, New Haven, Connecticut 06511, USA
Università di Ferrara, Dipartimento di Fisica and INFN, I-44100 Ferrara, Italy
California Institute of Technology, Pasadena, California 91125, USA
University of Texas at Austin, Austin, Texas 78712, USA
University of California at Santa Barbara, Santa Barbara, California 93106, USA
University of Massachusetts, Amherst, Massachusetts 01003, USA
University of Oregon, Eugene, Oregon 97403, USA
Università di Torino, Dipartimento di Fisica Sperimentale and INFN, I-10125 Torino, Italy
Laboratori Nazionali di Frascati dell'INFN, I-00044 Frascati, Italy
Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
Prairie View A&M University, Prairie View, Texas 77446, USA
University of Colorado, Boulder, Colorado 80309, USA
Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
Imperial College London, London, SW7 2AZ, United Kingdom
Universität Karlsruhe, Institut für Experimentelle Kernphysik, D-76021 Karlsruhe, Germany
Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia
Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
University of Mississippi, University, Mississippi 38677, USA
University of Victoria, Victoria, British Columbia, Canada V8W 3P6
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom
Harvard University, Cambridge, Massachusetts 02138, USA
Mount Holyoke College, South Hadley, Massachusetts 01075, USA
Queen Mary, University of London, E1 4NS, United Kingdom
Universität Rostock, D-18051 Rostock, Germany
University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
University of Louisville, Louisville, Kentucky 40292, USA
University of California at Irvine, Irvine, California 92697, USA
University of California at San Diego, La Jolla, California 92093, USA
NIKHEF, National Institute for Nuclear Physics and High Energy Physics, NL-1009 DB Amsterdam, The Netherlands
Università di Pisa, Dipartimento di Fisica, Scuola Normale Superiore and INFN, I-56127 Pisa, Italy
Università di Padova, Dipartimento di Fisica and INFN, I-35131 Padova, Italy
University of Texas at Dallas, Richardson, Texas 75083, USA
DSM/Dapnia, CEA/Saclay, F-91191 Gif-sur-Yvette, France
Massachusetts Institute of Technology, Laboratory for Nuclear Science, Cambridge, Massachusetts 02139, USA
IFIC, Universitat de Valencia-CSIC, E-46071 Valencia, Spain
University of Cincinnati, Cincinnati, Ohio 45221, USA
Princeton University, Princeton, New Jersey 08544, USA
Ohio State University, Columbus, Ohio 43210, USA
University of South Carolina, Columbia, South Carolina 29208, USA
State University of New York, Albany, New York 12222, USA
Stanford Linear Accelerator Center, Stanford, California 94309, USA
Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain
University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA
Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France
Universität Heidelberg, Physikalisches Institut, Philosophenweg 12, D-69120 Heidelberg, Germany
University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
Università di Genova, Dipartimento di Fisica and INFN, I-16146 Genova, Italy
Università di Trieste, Dipartimento di Fisica and INFN, I-34127 Trieste, Italy
University of London, Royal Holloway and Bedford New College, Egham, Surrey TW20 0EX, United Kingdom
University of California at Riverside, Riverside, California 92521, USA
Stanford University, Stanford, California 94305-4060, USA
Università di Perugia, Dipartimento di Fisica and INFN, I-06100 Perugia, Italy
Université de Montréal, Physique des Particules, Montréal, Québec, Canada H3C 3J7
Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, F-91128 Palaiseau, France
University of Notre Dame, Notre Dame, Indiana 46556, USA
University of Wisconsin, Madison, Wisconsin 53706, USA
Universität Dortmund, Institut für Physik, D-44221 Dortmund, Germany
University of Manchester, Manchester M13 9PL, United Kingdom
McGill University, Montréal, Québec, Canada H3A 2T8
Technische Universität Dresden, Institut für Kern- und Teilchenphysik, D-01062 Dresden, Germany
University of California at Los Angeles, Los Angeles, California 90024, USA
University of Birmingham, Birmingham, B15 2TT, United Kingdom
Università di Bari, Dipartimento di Fisica and INFN, I-70126 Bari, Italy
Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, B. P. 34, F-91898 ORSAY Cedex, France
University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
Università di Napoli Federico II, Dipartimento di Scienze Fisiche and INFN, I-80126, Napoli, Italy
Università di Milano, Dipartimento di Fisica and INFN, I-20133 Milano, Italy
University of Bristol, Bristol BS8 1TL, United Kingdom
University of Liverpool, Liverpool L69 7ZE, United Kingdom
University of Bergen, Institute of Physics, N-5007 Bergen, Norway
Johns Hopkins University, Baltimore, Maryland 21218, USA
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
University of Maryland, College Park, Maryland 20742, USA
Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA
| | Received. 02 August 2007 Last updated. 29 November 2007 | | Abstract. We report the observation of charmless hadronic decays of charged B mesons to the final state K+K-pi+. Using a data sample of 347.5 fb^-1 collected at the Y(4S) resonance with the BABAR detector, we observe 429+/-43 signal events with a significance of 9.6 sigma. We measure the inclusive branching fraction BF(B+ --> K+K-pi+) = [5.0+/-0.5(stat)+/-0.5(syst)]x10^-6. Inspection of the Dalitz plot of signal candidates shows a broad structure peaking near 1.5 GeV/c^2 in the K+K- invariant mass distribution. We find the direct CP asymmetry to be consistent with zero. | | Categories. hep-ex | | Comment. 7 pages, 5 postscript figures, published in PRL | | Journal-ref. Phys. Rev. Lett. 99, 221801 (2007) | | Report No. BABAR-PUB-07/041, SLAC-PUB-12702 | | Published Article doi: 10.1103/PhysRevLett.99.221801 |
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