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arXiv 2017年

作者： Carnerero, M.I. Raiteri, C.M. Villata, M. Acosta-Pulido, J.A. Larionov, V.M. Smith, P.S. D’Ammando, F. Agudo, I. Arévalo, M.J. Bachev, R. Barnes, J. Boeva, S. Bozhilov, V. Carosati, D. Casadio, C. Chen, W.P. Damljanovic, G. Eswaraiah, E. Forné, E. Gantchev, G. Gómez, J.L. González-Morales, P.A. Griñón-Marín, A.B. Grishina, T.S. Holden, M. Ibryamov, S. Joner, M.D. Jordan, B. Jorstad, S.G. Joshi, M. Kopatskaya, E.N. Koptelova, E. Kurtanidze, O.M. Kurtanidze, S.O. Larionova, E.G. Larionova, L.V. Latev, G. Lázaro, C. Ligustri, R. Lin, H.C. Marscher, A.P. Martínez-Lombilla, C. McBreen, B. Mihov, B. Molina, S.N. Moody, J.W. Morozova, D.A. Nikolashvili, M.G. Nilsson, K. Ovcharov, E. Pace, C. Panwar, N. Pastor Yabar, A. Pearson, R.L. Pinna, F. Protasio, C. Rizzi, N. Redondo-Lorenzo, F.J. Rodríguez-Coira, G. Ros, J.A. Sadun, A.C. Savchenko, S.S. Semkov, E. Slavcheva-Mihova, L. Smith, N. Strigachev, A. Troitskaya, Yu.V. Troitsky, I.S. Vasilyev, A.A. Vince, O. INAF Osservatorio Astrofisico di Torino via Osservatorio 20 Pino TorineseI-10025 Italy La Laguna TenerifeE-38200 Spain Departamento de Astrofisica Universidad de La Laguna La Laguna TenerifeE-38205 Spain Astronomical Institute St. Petersburg State University Universitetsky pr. 28 Petrodvoretz St. Petersburg198504 Russia Pulkovo Observatory St. Petersburg196140 Russia Steward Observatory University of Arizona TucsonAZ85721 United States INAF Istituto di Radioastronomia via Gobetti 101 BolognaI-40129 Italy DIFA Universitá di Bologna Viale B. Pichat 6/2 BolognaI-40127 Italy Instituto de Astrofísica de Andalucía CSIC Apartado 3004 GranadaE-18080 Spain Institute of Astronomy and NAO Bulgarian Academy of Sciences 72 Tsarigradsko shosse Blvd. Sofia1784 Bulgaria Department of Physics Salt Lake Community College Salt Lake CityUT84070 United States Dept. of Astronomy Faculty of Physics Sofia University SofiaBG-1164 Bulgaria EPT Observatories Tijarafe La PalmaE-38780 Spain INAF TNG Fundación Galileo Galilei La PalmaE-38712 Spain Max-Planck-Institut für Radioastronomie Bonn Germany Graduate Institute of Astronomy National Central University 300 Jhongda Rd Jhongli City Taoyuan County32001 Taiwan Astronomical Observatory Volgina 7 Belgrade11060 Serbia Agrupació Astronòmica de Sabadell Spain Department of Physics and Astronomy Brigham Young University ProvoUT84602 United States Department of Theoretical and Applied Physics University of Shumen Shumen9712 Bulgaria School of Cosmic Physics Dublin Institute For Advanced Studies Ireland Institute for Astrophysical Research Boston University 725 Commonwealth Avenue BostonMA02215 United States Abastumani Observatory Mt. Kanobili AbastumaniGA0301 United States Engelhardt Astronomical Observatory Kazan Federal University Tatarstan Russia Center for Astrophysics Guangzhou University Guangzhou510006 China Circolo Astrofili Talmassons Italy UCD School of Physics University Colle

We report on long-term multi-wavelength monitoring of blazar Mrk 421 by the GASP-WEBT collaboration and Steward Observatory, and by the Swift and Fermi satellites. We study the source behaviour in the period 2007–2015, characterized by several extreme flares. The ratio between the optical, X-ray, and γ-ray fluxes is very variable. The γ-ray flux variations show fair correlation with the optical ones starting from 2012. We analyse spectropolarimetric data and find wavelength-dependence of the polarisation degree (P), which is compatible with the presence of the host galaxy, and no wavelength-dependence of the electric vector polarisation angle (EVPA). Optical polarimetry shows a lack of simple correlation between P and flux and wide rotations of the EVPA. We build broad-band spectral energy distributions with simultaneous near-infrared and optical data from the GASP-WEBT and UV and X-ray data from the Swift satellite. They show strong variability in both flux and X-ray spectral shape and suggest a shift of the synchrotron peak up to a factor ∼ 50 in frequency. The interpretation of the flux and spectral variability is compatible with jet models including at least two emitting regions that can change their orientation with respect to the line of sight. Copyright © 2017, The Authors. All rights reserved.

关键词： Polarization

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Asteroid ryugu before the Hayabusa2 encounter

arXiv

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arXiv 2018年

作者： Wada, Koji Grott, Matthias Michel, Patrick Walsh, Kevin J. Barucci, Antonella M. Biele, Jens Blum, Jürgen Ernst, Carolyn M. Grundmann, Jan T. Gundlach, Bastian Hagermann, Axel Hamm, Maximilian Jutzi, Martin Kim, Myung-Jin Kührt, Ekkehard Le Corre, Lucille Libourel, Guy Lichtenheldt, Roy Maturilli, Alessandro Messenger, Scott R. Michikami, Tatsuhiro Miyamoto, Hideaki Mottola, Stefano Nakamura, Akiko M. Müller, Thomas Nittler, Larry R. Ogawa, Kazunori Okada, Tatsuaki Palomba, Ernesto Sakatani, Naoya Schröder, Stefan Takir, Driss Zolensky, Michael E. Tsudanuma 2-17-1 Narashino Chiba275-0016 Japan DLR Institute for Planetary Research Rutherfordstr. 2 Berlin12489 Germany Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Lagrange Laboratory Southwest Research Institute Boulder United States Observatoire de Paris PSL Research University CNRS Université Paris Diderot Sorbonne Paris Cité UPMC Université Paris 06 Sorbonne Universités 5 Place J. Janssen Meudon Principal Cedex92195 France DLR RB-MSC German Aerospace Center Cologne51147 Germany Institut für Geophysik und extraterrestrische Physik Technische Universität Braunschweig Mendelssohnstr. 3 BraunschweigD-38106 Germany Johns Hopkins University Applied Physics Laboratory LaurelMD United States DLR German Aerospace Center Institute of Space Systems System Engineering and Project Office Robert-Hooke-Strasse 7 BremenD-28359 Germany Department of Biological and Environmental Sciences University of Stirling FK9 4LA United Kingdom Physics Institute University of Bern Switzerland Center for Space Situational Awareness Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejeon305-348 Korea Republic of Planetary Science Institute 1700 East Fort Lowell Suite 106 TucsonAZ85719 United States DLR Institute of System Dynamics and Control Oberpfaffenhoffen Germany Robert M Walker for Space Sciences Astromaterials Research and Exploration Science NASA Johnson Space Center HoustonTX77058 United States Faculty of Engineering Kindai University Hiroshima Campus 1 Takaya Umenobe Higashi-Hiroshima Hiroshima739-2116 Japan Deptartment of Systems Innovation University of Tokyo Tokyo Japan Department of Planetology Graduate School of Science Kobe University 1-1 Rokkodai Nada-ku Kobe657-8501 Japan Max-Planck Institute for Extraterrestrial Physics Garching Germany Department of Terrestrial Magnetism Carnegie Institution of Washington 5241 Broad Branch Rd NW 20015 United States Institute of Space and Astronautical Sc

Asteroid (162173) Ryugu is the target object of Hayabusa2, an asteroid exploration and sample return mission led by Japan Aerospace Exploration Agency (JAXA). Ground-based observations indicate that Ryugu is a C-type near-Earth asteroid with a diameter of less than 1 km, but the knowledge of its detailed properties is still very limited. This paper summarizes our best understanding of the physical and dynamical properties of Ryugu based on remote sensing and theoretical modeling. This information is used to construct a design reference model of the asteroid that is used for formulation of mission operations plans in advance of asteroid arrival. Particular attention is given to the surface properties of Ryugu that are relevant to sample acquisition. This reference model helps readers to appropriately interpret the data that will be directly obtained by Hayabusa2 and promotes scientific studies not only for Ryugu itself and other small bodies but also for the Solar System evolution that small bodies shed light on. Copyright © 2018, The Authors. All rights reserved.

关键词： Asteroids

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Addendum to ‘Measurement of the t t ¯ production cross-section using e μ events with b-tagged jets in pp collisions at s = 7 and 8 TeV with the ATLAS detector’

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The European Physical Journal C 2016年第11期76卷 1-14页

作者： Aad, G. Abbott, B. Abdallah, J. Abdel Khalek, S. Abdinov, O. Aben, R. Abi, B. Abolins, M. AbouZeid, O. S. Abramowicz, H. Abreu, H. Abreu, R. Abulaiti, Y. Acharya, B. S. Adamczyk, L. Adams, D. L. Adelman, J. Adomeit, S. Adye, T. Agatonovic-Jovin, T. Aguilar-Saavedra, J. A. Agustoni, M. Ahlen, S. P. Ahmadov, F. Aielli, G. Akerstedt, H. Åkesson, T. P. A. Akimoto, G. Akimov, A. V. Alberghi, G. L. Albert, J. Albrand, S. Alconada Verzini, M. J. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexander, G. Alexandre, G. Alexopoulos, T. Alhroob, M. Alimonti, G. Alio, L. Alison, J. Allbrooke, B. M. M. Allison, L. J. Allport, P. P. Almond, J. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Altheimer, A. Alvarez Gonzalez, B. Alviggi, M. G. Amako, K. Amaral Coutinho, Y. Amelung, C. Amidei, D. Santos, S. P. Amor Dos Amorim, A. Amoroso, S. Amram, N. Amundsen, G. Anastopoulos, C. Ancu, L. S. Andari, N. Andeen, T. Anders, C. F. Anders, G. Anderson, K. J. Andreazza, A. Andrei, V. Anduaga, X. S. Angelidakis, S. Angelozzi, I. Anger, P. Angerami, A. Anghinolfi, F. Anisenkov, A. V. Anjos, N. Annovi, A. Antonaki, A. Antonelli, M. Antonov, A. Antos, J. Anulli, F. Aoki, M. Aperio Bella, L. Apolle, R. Arabidze, G. Aracena, I. Arai, Y. Araque, J. P. Arce, A. T. H. Arguin, J-F. Argyropoulos, S. Arik, M. Armbruster, A. J. Arnaez, O. Arnal, V. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Asai, S. Asbah, N. Ashkenazi, A. Åsman, B. Asquith, L. Assamagan, K. Astalos, R. Atkinson, M. Atlay, N. B. Auerbach, B. Augsten, K. Aurousseau, M. Avolio, G. Azuelos, G. Azuma, Y. Baak, M. A. Baas, A. Bacci, C. Bachacou, H. Bachas, K. Backes, M. Backhaus, M. Backus Mayes, J. Badescu, E. Bagiacchi, P. Bagnaia, P. Bai, Y. Bain, T. Baines, J. T. Baker, O. K. Balek, P. Balli, F. Banas, E. Banerjee, Sw. Bannoura, A. A. E. Bansal, V. Bansil, H. S. Barak, L. Baranov, S. P. Barberio, E. L. Barberis, D. Barbero, M. Barillari, T. Barisonzi, M. Barklow, T. Barlow, N. Barnett, B. M. Barnett, R. M. Barnovska, Z. Baroncelli, A. Barone, G. Barr, A. J. Barreiro, F. da CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman USA Institute of Physics Academia Sinica Taipei Taiwan LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands Department of Physics Oklahoma State University Stillwater USA Department of Physics and Astronomy Michigan State University East Lansing USA Department of Physics University of Toronto Toronto Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden Particle Physics Department Rutherford Appleton Laboratory Didcot UK AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Physics Department Brookhaven National Laboratory Upton USA Department of Physics Yale University New Haven USA Fakultät für Physik Ludwig-Maximilians-Universität München Munich Germany Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP Lisbon Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Rome Italy Dipartimento di Fisica Università di Roma Tor Vergata Rome Italy Fysiska institutionen Lunds universitet Lund Sweden International Center for Elementary Particle Physics and Depa

The ATLAS measurement of the inclusive top quark pair ( $$t\bar{t}$$ ) cross-section $$\sigma _{t\bar{t}}$$ in proton–proton collisions at $$\sqrt{s}=8$$ $$\,\mathrm{TeV}$$ has been updated using the final 2012 luminosity calibration. The updated cross-section result is: $$\begin{aligned} \sigma _{t\bar{t}}= 242.9\pm 1.7\pm 5.5\pm 5.1\pm 4.2\,\mathrm pb, \end{aligned}$$ where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, knowledge of the integrated luminosity and of the LHC beam energy. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. The measurement of the ratio of $$t\bar{t}$$ cross-sections at $$\sqrt{s}=8$$ $$\,\mathrm{TeV}$$ and $$\sqrt{s}=7$$ $$\,\mathrm{TeV}$$ , and the $$\sqrt{s}=8$$ $$\,\mathrm{TeV}$$ fiducial measurement corresponding to the experimental acceptance of the leptons, have also been updated.

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Erratum to: Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector

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The European Physical Journal C 2016年第3期76卷 1-14页

作者： Aad, G. Abbott, B. Abdallah, J. Abdinov, O. Aben, R. Abolins, M. AbouZeid, O. S. Abramowicz, H. Abreu, H. Abreu, R. Abulaiti, Y. Acharya, B. S. Adamczyk, L. Adams, D. L. Adelman, J. Adomeit, S. Adye, T. Affolder, A. A. Agatonovic-Jovin, T. Agricola, J. Aguilar-Saavedra, J. A. Ahlen, S. P. Ahmadov, F. Aielli, G. Akerstedt, H. Åkesson, T. P. A. Akimov, A. V. Alberghi, G. L. Albert, J. Albrand, S. Alconada Verzini, M. J. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexander, G. Alexopoulos, T. Alhroob, M. Alimonti, G. Alio, L. Alison, J. Alkire, S. P. Allbrooke, B. M. M. Allport, P. P. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Altheimer, A. Alvarez Gonzalez, B. Álvarez Piqueras, D. Alviggi, M. G. Amadio, B. T. Amako, K. Amaral Coutinho, Y. Amelung, C. Amidei, D. Amor Dos Santos, S. P. Amorim, A. Amoroso, S. Amram, N. Amundsen, G. Anastopoulos, C. Ancu, L. S. Andari, N. Andeen, T. Anders, C. F. Anders, G. Anders, J. K. Anderson, K. J. Andreazza, A. Andrei, V. Angelidakis, S. Angelozzi, I. Anger, P. Angerami, A. Anghinolfi, F. Anisenkov, A. V. Anjos, N. Annovi, A. Antonelli, M. Antonov, A. Antos, J. Anulli, F. Aoki, M. Aperio Bella, L. Arabidze, G. Arai, Y. Araque, J. P. Arce, A. T. H. Arduh, F. A. Arguin, J.-F. Argyropoulos, S. Arik, M. Armbruster, A. J. Arnaez, O. Arnal, V. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Asai, S. Asbah, N. Ashkenazi, A. Åsman, B. Asquith, L. Assamagan, K. Astalos, R. Atkinson, M. Atlay, N. B. Auerbach, B. Augsten, K. Aurousseau, M. Avolio, G. Axen, B. Ayoub, M. K. Azuelos, G. Baak, M. A. Baas, A. E. Bacci, C. Bachacou, H. Bachas, K. Backes, M. Backhaus, M. Bagiacchi, P. Bagnaia, P. Bai, Y. Bain, T. Baines, J. T. Baker, O. K. Baldin, E. M. Balek, P. Balestri, T. Balli, F. Banas, E. Banerjee, Sw. Bannoura, A. A. E. Bansil, H. S. Barak, L. Barberio, E. L. Barberis, D. Barbero, M. Barillari, T. Barisonzi, M. Barklow, T. Barlow, N. Barnes, S. L. Barnett, B. M. Barnett, R. M. Barnovska, Z. Baroncelli, A. Barone, G. Barr, A. J. Barreiro, F. Barreiro Guimarães da Costa, J. Bart CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman USA Institute of Physics Academia Sinica Taipei Taiwan Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands Department of Physics and Astronomy Michigan State University East Lansing USA Department of Physics University of Toronto Toronto Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel Center for High Energy Physics University of Oregon Eugene USA Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Physics Department Brookhaven National Laboratory Upton USA Department of Physics Northern Illinois University De Kalb USA Fakultät für Physik Ludwig-Maximilians-Universität München Munich Germany Particle Physics Department Rutherford Appleton Laboratory Didcot UK Oliver Lodge Laboratory University of Liverpool Liverpool UK Institute of Physics University of Belgrade Belgrade Serbia II Physikalisches Institut Georg-August-Universität Göttingen Germany Laboratório de Instrumentação e Física Experimental de Partículas-LIP Lisbon Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Rome Italy Dipartimento di Fisica Università di Roma Tor Vergata Rome Italy Fysiska institutionen Lunds universitet Lund Sweden P.N. Lebedev Institute of Physics Academy of Sciences

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Erratum to: ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider ATLAS Collaboration

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The European Physical Journal C 2016年第3期76卷 1-14页

作者： Aad, G. Abbott, B. Abdallah, J. Abdinov, O. Aben, R. Abolins, M. AbouZeid, O. S. Abramowicz, H. Abreu, H. Abreu, R. Abulaiti, Y. Acharya, B. S. Adamczyk, L. Adams, D. L. Adelman, J. Adomeit, S. Adye, T. Affolder, A. A. Agatonovic-Jovin, T. Agricola, J. Aguilar-Saavedra, J. A. Ahlen, S. P. Ahmadov, F. Aielli, G. Akerstedt, H. Åkesson, T. P. A. Akimov, A. V. Alberghi, G. L. Albert, J. Albrand, S. Alconada Verzini, M. J. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexander, G. Alexopoulos, T. Alhroob, M. Alimonti, G. Alio, L. Alison, J. Alkire, S. P. Allbrooke, B. M. M. Allport, P. P. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Altheimer, A. Alvarez Gonzalez, B. Álvarez Piqueras, D. Alviggi, M. G. Amadio, B. T. Amako, K. Amaral Coutinho, Y. Amelung, C. Amidei, D. Amor Dos Santos, S. P. Amorim, A. Amoroso, S. Amram, N. Amundsen, G. Anastopoulos, C. Ancu, L. S. Andari, N. Andeen, T. Anders, C. F. Anders, G. Anders, J. K. Anderson, K. J. Andreazza, A. Andrei, V. Angelidakis, S. Angelozzi, I. Anger, P. Angerami, A. Anghinolfi, F. Anisenkov, A. V. Anjos, N. Annovi, A. Antonelli, M. Antonov, A. Antos, J. Anulli, F. Aoki, M. Aperio Bella, L. Arabidze, G. Arai, Y. Araque, J. P. Arce, A. T. H. Arduh, F. A. Arguin, J.-F. Argyropoulos, S. Arik, M. Armbruster, A. J. Arnaez, O. Arnal, V. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Asai, S. Asbah, N. Ashkenazi, A. Åsman, B. Asquith, L. Assamagan, K. Astalos, R. Atkinson, M. Atlay, N. B. Auerbach, B. Augsten, K. Aurousseau, M. Avolio, G. Axen, B. Ayoub, M. K. Azuelos, G. Baak, M. A. Baas, A. E. Baca, M. J. Bacci, C. Bachacou, H. Bachas, K. Backes, M. Backhaus, M. Bagiacchi, P. Bagnaia, P. Bai, Y. Bain, T. Baines, J. T. Baker, O. K. Baldin, E. M. Balek, P. Balestri, T. Balli, F. Banas, E. Banerjee, Sw. Bannoura, A. A. E. Bansil, H. S. Barak, L. Barberio, E. L. Barberis, D. Barbero, M. Barillari, T. Barisonzi, M. Barklow, T. Barlow, N. Barnes, S. L. Barnett, B. M. Barnett, R. M. Barnovska, Z. Baroncelli, A. Barone, G. Barr, A. J. Barreiro, F. Barreiro Guimarães da Co CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman USA Institute of Physics Academia Sinica Taipei Taiwan Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands Department of Physics and Astronomy Michigan State University East Lansing USA Department of Physics University of Toronto Toronto Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel Center for High Energy Physics University of Oregon Eugene USA Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Physics Department Brookhaven National Laboratory Upton USA Department of Physics Northern Illinois University De Kalb USA Fakultät für Physik Ludwig-Maximilians-Universität München Munich Germany Particle Physics Department Rutherford Appleton Laboratory Didcot UK Oliver Lodge Laboratory University of Liverpool Liverpool UK Institute of Physics University of Belgrade Belgrade Serbia II Physikalisches Institut Georg-August-Universität Göttingen Germany Laboratório de Instrumentação e Física Experimental de Partículas-LIP Lisbon Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Rome Italy Dipartimento di Fisica Università di Roma Tor Vergata Rome Italy Fysiska institutionen Lunds universitet Lund Sweden P.N. Lebedev Institute of Physics Academy of Sciences

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Measurement of parity-violating spin asymmetries in W± production at midrapidity in longitudinally polarized p+p collisions

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Physical Review D 2016年第5期93卷 051103(R)-051103(R)页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai X. Bai N. S. Bandara B. Bannier K. N. Barish B. Bassalleck S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors N. Cronin N. Crossette M. Csanád T. Csörgő S. Dairaku T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond O. Dietzsch L. Ding A. Dion P. B. Diss J. H. Do M. Donadelli L. D’Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum S. Edwards Y. V. Efremenko T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji H. Guragain T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano S. Hayashi X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Horaguchi T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara H. Iinuma Y. Ikeda K. Imai Y. Imazu J. Imrek M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak M. Javani S. J. Jeon M. Jezghani J. Jia X. Jiang B. M. Johnson E. Joo K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu D. Kawall A. V. Kazantsev T. Kempel J. A. Key V. Khachatryan P. K. Khandai A. Khanzadeev K. Kihara K. M. Kijima B. I. University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Kyoto University Kyoto 606-8502 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing 102413 People’s Republic of China Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia National Research Center “Kurchatov Institute ” Moscow 123098 Russia New Mexico State University Las

We present midrapidity measurements from the PHENIX experiment of large parity-violating single-spin asymmetries of high transverse momentum electrons and positrons from W±/Z decays, produced in longitudinally polarized p+p collisions at center of mass energies of s=500 and 510 GeV. These asymmetries allow direct access to the antiquark polarized parton distribution functions due to the parity-violating nature of the W-boson coupling to quarks and antiquarks. The results presented are based on data collected in 2011, 2012, and 2013 with an integrated luminosity of 240 pb−1, which exceeds previous PHENIX published results by a factor of more than 27. These high Q2 data probe the parton structure of the proton at W mass scale and provide an important addition to our understanding of the antiquark parton helicity distribution functions at an intermediate Bjorken x value of roughly MW/s=0.16.

关键词： Particle production W & Z bosons Hadron colliders Protons Polarization

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Measurement of the transverse momentum and ϕ η ∗ distributions of Drell–Yan lepton pairs in proton–proton collisions at s = 8 TeV with the ATLAS detector

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The European Physical Journal C 2016年第5期76卷 1-61页

作者： Aad, G. Abbott, B. Abdallah, J. Abdinov, O. Aben, R. Abolins, M. AbouZeid, O. S. Abramowicz, H. Abreu, H. Abreu, R. Abulaiti, Y. Acharya, B. S. Adamczyk, L. Adams, D. L. Adelman, J. Adomeit, S. Adye, T. Affolder, A. A. Agatonovic-Jovin, T. Agricola, J. Aguilar-Saavedra, J. A. Ahlen, S. P. Ahmadov, F. Aielli, G. Akerstedt, H. Åkesson, T. P. A. Akimov, A. V. Alberghi, G. L. Albert, J. Albrand, S. Alconada Verzini, M. J. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexander, G. Alexopoulos, T. Alhroob, M. Alimonti, G. Alio, L. Alison, J. Alkire, S. P. Allbrooke, B. M. M. Allport, P. P. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Altheimer, A. Alvarez Gonzalez, B. Álvarez Piqueras, D. Alviggi, M. G. Amadio, B. T. Amako, K. Amaral Coutinho, Y. Amelung, C. Amidei, D. Amor Dos Santos, S. P. Amorim, A. Amoroso, S. Amram, N. Amundsen, G. Anastopoulos, C. Ancu, L. S. Andari, N. Andeen, T. Anders, C. F. Anders, G. Anders, J. K. Anderson, K. J. Andreazza, A. Andrei, V. Angelidakis, S. Angelozzi, I. Anger, P. Angerami, A. Anghinolfi, F. Anisenkov, A. V. Anjos, N. Annovi, A. Antonelli, M. Antonov, A. Antos, J. Anulli, F. Aoki, M. Aperio Bella, L. Arabidze, G. Arai, Y. Araque, J. P. Arce, A. T. H. Arduh, F. A. Arguin, J.-F. Argyropoulos, S. Arik, M. Armbruster, A. J. Arnaez, O. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Artz, S. Asai, S. Asbah, N. Ashkenazi, A. Åsman, B. Asquith, L. Assamagan, K. Astalos, R. Atkinson, M. Atlay, N. B. Augsten, K. Aurousseau, M. Avolio, G. Axen, B. Ayoub, M. K. Azuelos, G. Baak, M. A. Baas, A. E. Baca, M. J. Bacci, C. Bachacou, H. Bachas, K. Backes, M. Backhaus, M. Bagiacchi, P. Bagnaia, P. Bai, Y. Bain, T. Baines, J. T. Baker, O. K. Baldin, E. M. Balek, P. Balestri, T. Balli, F. Balunas, W. K. Banas, E. Banerjee, Sw. Bannoura, A. A. E. Barak, L. Barberio, E. L. Barberis, D. Barbero, M. Barillari, T. Barisonzi, M. Barklow, T. Barlow, N. Barnes, S. L. Barnett, B. M. Barnett, R. M. Barnovska, Z. Baroncelli, A. Barone, G. Barr, A. J. Barreiro, F. Barreiro Guimarães da Costa, J. Barto CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman USA Institute of Physics Academia Sinica Taipei Taiwan Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands Department of Physics and Astronomy Michigan State University East Lansing USA Department of Physics University of Toronto Toronto Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel Center for High Energy Physics University of Oregon Eugene USA Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Physics Department Brookhaven National Laboratory Upton USA Department of Physics Northern Illinois University De Kalb USA Fakultät für Physik Ludwig-Maximilians-Universität München Munich Germany Particle Physics Department Rutherford Appleton Laboratory Didcot UK Oliver Lodge Laboratory University of Liverpool Liverpool UK Institute of Physics University of Belgrade Belgrade Serbia II Physikalisches Institut Georg-August-Universität Göttingen Germany Laboratório de Instrumentação e Física Experimental de Partículas-LIP Lisbon Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Rome Italy Dipartimento di Fisica Università di Roma Tor Vergata Rome Italy Fysiska institutionen Lunds universitet Lund Sweden P.N. Lebedev Institute of Physics

Distributions of transverse momentum $$p_T^{\ell \ell }$$ and the related angular variable $$\phi ^*_\eta $$ of DrellΓÇôYan lepton pairs are measured in 20.3┬áfb $$^{-1}$$ of protonΓÇôproton collisions at $$\sqrt{s}=8$$ ┬áTeV with the ATLAS detector at the LHC. Measurements in electron-pair and muon-pair final states are corrected for detector effects and combined. Compared to previous measurements in protonΓÇôproton collisions at $$\sqrt{s}=7$$ ┬áTeV, these new measurements benefit from a larger data sample and improved control of systematic uncertainties. Measurements are performed in bins of lepton-pair mass above, around and below the Z-boson mass peak. The data are compared to predictions from perturbative and resummed QCD calculations. For values of $$\phi ^*_\eta < 1$$ the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of $$\phi ^*_\eta $$ this is not the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of $$p_T^{\ell \ell }$$ while the fixed-order prediction of Dynnlo falls below the data at high values of $$p_T^{\ell \ell }$$ . ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the $$\phi ^*_\eta $$ and $$p_T^{\ell \ell }$$ distributions as a function of lepton-pair mass and rapidity than the basic shape of the data.

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Cross section and transverse single-spin asymmetry of muons from open heavy-flavor decays in polarized p+p collisions at √s = 200 GeV

arXiv

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arXiv 2017年

作者： Aidala, C. Ajitanand, N.N. Akiba, Y. Akimoto, R. Alexander, J. Alfred, M. Aoki, K. Apadula, N. Asano, H. Atomssa, E.T. Awes, T.C. Ayuso, C. Azmoun, B. Babintsev, V. Bagoly, A. Bai, M. Bai, X. Bannier, B. Barish, K.N. Bathe, S. Baublis, V. Baumann, C. Baumgart, S. Bazilevsky, A. Beaumier, M. Belmont, R. Berdnikov, A. Berdnikov, Y. Black, D. Blau, D.S. Boer, M. Bok, J.S. Boyle, K. Brooks, M.L. Bryslawskyj, J. Buesching, H. Bumazhnov, V. Butler, C. Butsyk, S. Campbell, S. Canoa Roman, V. Chen, C.-H. Chi, C.Y. Chiu, M. Choi, I.J. Choi, J.B. Choi, S. Christiansen, P. Chujo, T. Cianciolo, V. Cole, B.A. Connors, M. Cronin, N. Crossette, N. Csanád, M. Csörgo, T. Danley, T.W. Datta, A. Daugherity, M.S. David, G. DeBlasio, K. Dehmelt, K. Denisov, A. Deshpande, A. Desmond, E.J. Ding, L. Do, J.H. D’Orazio, L. Drapier, O. Drees, A. Drees, K.A. Dumancic, M. Durham, J.M. Durum, A. Elder, T. Engelmore, T. Enokizono, A. Esumi, S. Eyser, K.O. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Fleuret, F. Fokin, S.L. Frantz, J.E. Franz, A. Frawley, A.D. Fukao, Y. Fukuda, Y. Fusayasu, T. Gainey, K. Gal, C. Garg, P. Garishvili, A. Garishvili, I. Ge, H. Giordano, F. Glenn, A. Gong, X. Gonin, M. Goto, Y. Granier de Cassagnac, R. Grau, N. Greene, S.V. Grosse Perdekamp, M. Gu, Y. Gunji, T. Guragain, H. Hachiya, T. Haggerty, J.S. Hahn, K.I. Hamagaki, H. Han, S.Y. Hanks, J. Hasegawa, S. Haseler, T.O.S. Hashimoto, K. Hayano, R. He, X. Hemmick, T.K. Hester, T. Hill, J.C. Hill, K. Hollis, R.S. Homma, K. Hong, B. Hoshino, T. Hotvedt, N. Huang, J. Huang, S. Ichihara, T. Ikeda, Y. Imai, K. Imazu, Y. Imrek, J. Inaba, M. Iordanova, A. Isenhower, D. Isinhue, A. Ito, Y. Ivanishchev, D. Jacak, B.V. Jeon, S.J. Jezghani, M. Ji, Z. Jia, J. Jiang, X. Johnson, B.M. Joo, K.S. Jorjadze, V. Jouan, D. Jumper, D.S. Kamin, J. Kanda, S. Kang, B.H. Kang, J.H. Kang, J.S. Kapukchyan, D. Abilene Christian University AbileneTX79699 United States Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Ovocný trh 5 Praha 1 Prague116 36 Czech Republic Chonbuk National University Jeonju561-756 Korea Republic of Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New YorkNY10027 United States Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Debrecen University Egyetem tér 1 DebrecenH-4010 Hungary ELTE Eötvös Loránd University Pázmány P. s. 1/A BudapestH-1117 Hungary Eszterházy Károly University Károly Róbert Campus Mátrai út 36 GyngyösH-3200 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hanyang University Seoul133-792 Korea Republic of Hiroshima University Kagamiyama Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino142281 Russia University of Illinois at Urbana-Champaign UrbanaIL61801 United States Institute for Nuclear Research of the

The cross section and transverse single-spin asymmetries of µ− and µ+ from open heavy-flavor decays in polarized p+p collisions at √s = 200 GeV were measured by the PHENIX experiment during 2012 at the Relativistic Heavy Ion Collider. Because heavy-flavor production is dominated by gluon-gluon interactions at √s = 200 GeV, these measurements offer a unique opportunity to obtain information on the trigluon correlation functions. The measurements are performed at forward and backward rapidity (1.4 Copyright © 2017, The Authors. All rights reserved.

关键词： Germanium alloys

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Measurements of B → J/ψ at forward rapidity in p+p collisions at √s = 510 GeV

arXiv

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arXiv 2017年

作者： Aidala, C. Ajitanand, N.N. Akiba, Y. Akimoto, R. Alexander, J. Alfred, M. Aoki, K. Apadula, N. Asano, H. Atomssa, E.T. Attila, A. Awes, T.C. Ayuso, C. Azmoun, B. Babintsev, V. Bai, M. Bai, X. Bannier, B. Barish, K.N. Bathe, S. Baublis, V. Baumann, C. Baumgart, S. Bazilevsky, A. Beaumier, M. Belmont, R. Berdnikov, A. Berdnikov, Y. Black, D. Blau, D.S. Boer, M. Bok, J.S. Boyle, K. Brooks, M.L. Bryslawskyj, J. Buesching, H. Bumazhnov, V. Butler, C. Butsyk, S. Campbell, S. CanoaRoman, C. Chen, C.-H. Chi, C.Y. Chiu, M. Choi, I.J. Choi, J.B. Choi, S. Christiansen, P. Chujo, T. Cianciolo, V. Cole, B.A. Connors, M. Cronin, N. Crossette, N. Csanád, M. Csörgő, T. Danley, T.W. Datta, A. Daugherity, M.S. David, G. DeBlasio, K. Dehmelt, K. Denisov, A. Deshpande, A. Desmond, E.J. Ding, L. Do, J.H. D’Orazio, L. Drapier, O. Drees, A. Drees, K.A. Dumancic, M. Durham, J.M. Durum, A. Elder, T. Engelmore, T. Enokizono, A. Esumi, S. Eyser, K.O. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Fleuret, F. Fokin, S.L. Frantz, J.E. Franz, A. Frawley, A.D. Fukao, Y. Fukuda, Y. Fusayasu, T. Gainey, K. Gal, C. Garg, P. Garishvili, A. Garishvili, I. Ge, H. Giordano, F. Glenn, A. Gong, X. Gonin, M. Goto, Y. Granier de Cassagnac, R. Grau, N. Greene, S.V. Grosse Perdekamp, M. Gu, Y. Gunji, T. Guragain, H. Hachiya, T. Haggerty, J.S. Hahn, K.I. Hamagaki, H. Han, S.Y. Hanks, J. Hasegawa, S. Haseler, T.O.S. Hashimoto, K. Hayano, R. He, X. Hemmick, T.K. Hester, T. Hill, J.C. Hill, K. Hollis, R.S. Homma, K. Hong, B. Hoshino, T. Hotvedt, N. Huang, J. Huang, S. Ichihara, T. Ikeda, Y. Imai, K. Imazu, Y. Inaba, M. Iordanova, A. Isenhower, D. Isinhue, A. Ito, Y. Ivanishchev, D. Jacak, B.V. Jeon, S.J. Jezghani, M. Ji, Z. Jia, J. Jiang, X. Johnson, B.M. Joo, K.S. Jorjadze, V. Jouan, D. Jumper, D.S. Kamin, J. Kanda, S. Kang, B.H. Kang, J.H. Kang, J.S. Kapukchyan, D. Kapustinsky, J. Abilene Christian University AbileneTX79699 United States Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Ovocný trh 5 Praha 1 Prague116 36 Czech Republic Chonbuk National University Jeonju561-756 Korea Republic of Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New YorkNY10027 United States Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Debrecen University H-4010 Debrecen Egyetem tér 1 Hungary ELTE Eötvös Loránd University Budapest Pázmány P. s. 1/AH-1117 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hanyang University Seoul133-792 Korea Republic of Hiroshima University Kagamiyama Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino142281 Russia University of Illinois at Urbana-Champaign UrbanaIL61801 United States Institute for Nuclear Research of the Russian Academy of Sciences prospekt 60-letiya Oktyabrya 7a Moscow117312 Russia Insti

We report the first measurement of the fraction of J/ψ mesons coming from B-meson decay (FB→J/ψ) in p+p collisions at √s = 510 GeV. The measurement is performed using the forward silicon vertex detector and central vertex detector at PHENIX, which provide precise tracking and distance-of-closest-approach determinations, enabling the statistical separation of J/ψ due to B-meson decays from prompt J/ψ. The measured value of FB→J/ψ is 8.1%±2.3% (stat)±1.9% (syst) for J/ψ with transverse momenta 0 B→J/ψ at PHENIX is compared to values measured by other experiments at higher center of mass energies and to fixed-order-next-to-leading-logarithm and color-evaporation-model predictions. The b¯b cross section per unit rapidity (dσ/dy(pp→b¯b)) extracted from the obtained FB→J/ψ and the PHENIX inclusive J/ψ cross section measured at 200 GeV scaled with color-evaporation-model calculations, at the mean B hadron rapidity y = ±1.7 in 510 GeV p+p collisions, is 3.63+1−1..9270µb. It is consistent with the fixed-order-next-to-leading-logarithm calculations. Copyright © 2017, The Authors. All rights reserved.

关键词： Germanium alloys

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Measurements of e+e− pairs from open heavy flavor in p+p and d+A collisions at sNN=200 GeV

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Physical Review C 2017年第2期96卷 024907-024907页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander M. Alfred K. Aoki N. Apadula L. Aphecetche J. Asai E. T. Atomssa R. Averbeck T. C. Awes C. Ayuso B. Azmoun V. Babintsev A. Bagoly M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. S. Blau M. Boer J. G. Boissevain J. S. Bok H. Borel K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce C. Butler S. Butsyk C. M. Camacho S. Campbell V. Canoa Roman B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku T. W. Danley K. Das G. David K. DeBlasio K. Dehmelt A. Denisov D. d'Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion J. H. Do M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey M. Dumancic J. M. Durham A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko T. Elder F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser B. Fadem W. Fan N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao Y. Fukuda T. Fusayasu C. Gal I. Garishvili H. Ge A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni J. S. Haggerty K. I. Hahn H. Hamagaki R. Han S. Y. Han E. P. Hartouni K. Haruna S. Hasegawa T. O. S. Haseler E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill K. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov Y. Ito D. Ivanishchev B. V. Jacak Z. Ji J. Jia J. Jin B. M. Johnson K. University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington DC 20059 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Kyoto University Kyoto 606-8502 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia ELTE Eötvös Loránd University H-1117 Budapest Pázmány P. s. 1/A Hungary Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New

We report a measurement of e+e− pairs from semileptonic heavy-flavor decays in p+p collisions at sNN=200 GeV. The e+e− pair yield from bb¯ and cc¯ is separated by exploiting a double differential fit done simultaneously in dielectron invariant mass and pT. We used three different event generators, pythia, mc@nlo, and powheg, to simulate the e+e− spectra from cc¯ and bb¯ production. The data can be well described by all three generators within the detector acceptance. However, when using the generators to extrapolate to 4π, significant differences are observed for the total cross section. These difference are less pronounced for bb¯ than for cc¯. The same model dependence was observed in already published d+A data. The p+p data are also directly compared with d+A data in mass and pT, and within the statistical accuracy no nuclear modification is seen.

关键词： Jets & heavy flavor physics Leptonic, semileptonic & radiative decays Particle & resonance production Relativistic heavy-ion collisions Bottom mesons Charmed mesons

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