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Discovering heavy new physics in boosted Z channels: Z→l+l− vs Z→νν¯

Physical Review D 2015年第1期92卷 011701(R)-011701(R)页

作者： Mihailo Backović Thomas Flacke Jeong Han Kim Seung J. Lee Center for Cosmology Particle Physics and Phenomenology—CP3 Universite Catholique de Louvain 2 Chemin du Cyclotron Louvain-la-Neuve Belgium Department of Physics Korea Advanced Institute of Science and Technology 335 Gwahak-ro Yuseong-gu Daejeon 305-701 Korea IBS Center for Theoretical Physics of the Universe 70 Yuseong-daero 1689-gil Yuseong-gu Daejeon Korea School of Physics Korea Institute for Advanced Study 85 Hoegiro Dongdaemun-gu Seoul 130-722 Korea

We propose a strategy for new physics searches in channels which contain a boosted Z boson and a boosted massive jet in the final state. Our proposal exploits the previously overlooked advantages of boosted Z→νν¯ topologies, where collimated neutrinos result in signals with large missing energy. We illustrate the advantage of this channel in a case study of singly produced TeV scale charge 2/3 fermionic top partners (T′) which decay to tZ final states. A comparison with the di-leptonic channel reveals that, despite the large tt¯ background, signals with missing energy combined with jet substructure techniques offer superior probes of new physics at TeV scales. The effect can be attributed to a factor of ∼3 enhancement in the signal cross section, coming from the branching ratio of Z→νν¯. We exploit the unique event topology of singly produced top partners to suppress the tt¯ background, as well as further improve on the existing proposals to detect T′ in the boosted di-lepton channel. Our conclusions on advantages of Z→νν¯ can be extended to most resonance searches which utilize a boosted Z boson in the final state.

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The THESEUS space mission concept: science case, design and expected performances

arXiv

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arXiv 2017年

作者： Amati, L. O'Brien, P. Götz, D. Bozzo, E. Tenzer, C. Frontera, F. Ghirlanda, G. Labanti, C. Osborne, J.P. Stratta, G. Tanvir, N. Willingale, R. Attina, P. Campana, R. Castro-Tirado, A.J. Contini, C. Fuschino, F. Gomboc, A. Hudec, R. Orleanski, P. Renotte, E. Rodic, T. Bagoly, Z. Blain, A. Callanan, P. Covino, S. Ferrara, A. Le Floch, E. Marisaldi, M. Mereghetti, S. Rosati, P. Vacchi, A. D'Avanzo, P. Giommi, P. Piranomonte, S. Piro, L. Reglero, V. Rossi, A. Santangelo, A. Salvaterra, R. Tagliaferri, G. Vergani, S. Vinciguerra, S. Briggs, M. Campolongo, E. Ciolfi, R. Connaughton, V. Cordier, B. Morelli, B. Orlandini, M. Adami, C. Argan, A. Atteia, J.-L. Auricchio, N. Balazs, L. Baldazzi, G. Basa, S. Basak, R. Bellutti, P. Bernardini, M.G. Bertuccio, G. Braga, J. Branchesi, M. Brandt, S. Brocato, E. Budtz-Jorgensen, C. Bulgarelli, A. Burderi, L. Camp, J. Capozziello, S. Caruana, J. Casella, P. Cenko, B. Chardonnet, P. Ciardi, B. Colafrancesco, S. Dainotti, M.G. D'Elia, V. De Martino, D. De Pasquale, M. Del Monte, E. Della Valle, M. Drago, A. Evangelista, Y. Feroci, M. Finelli, F. Fiorini, M. Fynbo, J. Gal-Yam, A. Gendre, B. Ghisellini, G. Grado, A. Guidorzi, C. Hafizi, M. Hanlon, L. Hjorth, J. Izzo, L. Kiss, L. Kumar, P. Kuvvetli, I. Lavagna, M. Li, T. Longo, F. Lyutikov, M. Maio, U. Maiorano, E. Malcovati, P. Malesani, D. Margutti, R. Martin-Carrillo, A. Masetti, N. McBreen, S. Mignani, R. Morgante, G. Mundell, C. Nargaard-Nielsen, H.U. Nicastro, L. Palazzi, E. Paltani, S. Panessa, F. Pareschi, G. Pe'er, A. Penacchioni, A.V. Pian, E. Piedipalumbo, E. Piran, T. Rauw, G. Razzano, M. Read, A. Rezzolla, L. Romano, P. Ruffini, R. Savaglio, S. Sguera, V. Schady, P. Skidmore, W. Song, L. Stanway, E. Starling, R. Topinka, M. Troja, E. Van Putten, M. Vanzella, E. Vercellone, S. Wilson-Hodge, C. Yonetoku, D. Zampa, G. Zampa, N. Zhang, B. Zhang, B.B. Zhang, S. Zhang, S.-N. Antonelli, A. Bianco, F. Boci, S. Aix-Marseille Univ. CNRS LAM Laboratoire dAstrophysique de Marseille Marseille13388 France INAF-IASF Bologna via P. Gobetti 101 BolognaI-40129 Italy ASDC Via del Politecnico snc Rome00133 Italy INAF-IAPS-Roma via Fosso del Cavaliere 100 Rome00133 Italy IRAP Université de Toulouse CNRS UPS CNES Toulouse France GP Advanced Projects Italy INAF-IASF Bologna via P. Gobetti 101. BolognaI-40129 Italy Eötvös University Budapest Hungary MTA CSFK Konkoly Observatory Konkoly-Thege M. út 13-17 Budapest1121 Hungary INFN - Sezione di Bologna Viale Berti Pichat 6/2 BolognaI-40127 Italy Department of Physics University of Bologna Viale Berti Pichat 6/2 BolognaI-40127 Italy 23807 Italy Oskar Klein Centre for Cosmoparticle Physics AlbaNova StockholmSE-106 91 Sweden Department of Physics KTH Royal Institute of Technology AlbaNova University Center StockholmSE-106 91 Sweden FBK via Sommarive 18 Povo Trento38123 Italy I-23807 Italy Politecnico di Milano Via Anzani 42 ComoI-22100 Italy INFN Milano Via Celoria 16 MilanoI-20133 Italy Center for Cosmology and Particle Physics New York University 4 Washington Place New YorkNY10003 United States Department of Physics and Astronomy University of Leicester LeicesterLE1 7RH United Kingdom Department of Physics University of Tirana Tirana Albania ARTEMIS CNRS UMR 5270 Université Côte d'Azur Observatoire de la Côte d'Azur boulevard de l'Observatoire CS 34229 Nice Cedex 04F-06304 France INAF - Capodimonte Astronomical observatory Naples Via Moiariello 16 NaplesI-80131 Italy Department of Astronomy University of Geneva ch. d'Écogia 16 VersoixCH-1290 Switzerland IRFU/Département d'Astrophysique CEA Université Paris-Saclay Gif-sur-YvetteF-91191 France INPE Av. dos Astronautas 1758 S.J.Campos-SP12227-010 Brazil Universit degli Studi di Urbino Carlo Bo via A. Saffi 2 Urbino61029 Italy INFN Sezione di Firenze via G. Sansone 1 Sesto Fiorentino50019 Italy DTU Space - National Space I

THESEUS is a space mission concept aimed at exploiting Gamma-Ray Bursts for investigating the early Universe and at providing a substantial advancement of multi-messenger and time-domain astrophysics. These goals will be achieved through a unique combination of instruments allowing GRB and X-ray transient detection over a broad field of view (more than 1sr) with 0.5-1 arcmin localization, an energy band extending from several MeV down to 0.3 keV and high sensitivity to transient sources in the soft X-ray domain, as well as on-board prompt (few minutes) followup with a 0.7 m class IR telescope with both imaging and spectroscopic capabilities. THESEUS will be perfectly suited for addressing the main open issues in cosmology such as, e.g., star formation rate and metallicity evolution of the inter-stellar and intra-galactic medium up to redshift ∼10, signatures of Pop III stars, sources and physics of reionization, and the faint end of the galaxy luminosity function. In addition, it will provide unprecedented capability to monitor the X-ray variable sky, thus detecting, localizing, and identifying the electromagnetic counterparts to sources of gravitational radiation, which may be routinely detected in the late '20s / early '30s by next generation facilities like aLIGO/aVirgo, eLISA, KAGRA, and Einstein Telescope. THESEUS will also provide powerful synergies with the next generation of multi-wavelength observatories (e.g., LSST, ELT, SKA, CTA, ATHENA). Copyright © 2017, The Authors. All rights reserved.

关键词： Stars

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Inflation after false vacuum decay: Observational prospects after Planck

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Physical Review D 2015年第8期91卷 083527-083527页

作者： Raphael Bousso Daniel Harlow Leonardo Senatore Center for Theoretical Physics and Department of Physics University of California Berkeley California 94720 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA Princeton Center for Theoretical Science Princeton University Princeton New Jersey 08540 USA Stanford Institute for Theoretical Physics Stanford University Stanford California 94306 USA Kavli Institute for Particle Astrophysics and Cosmology Stanford University and SLAC Menlo Park California 94025 USA CERN Theory Division 1211 Geneva 23 Switzerland

We assess two potential signals of the formation of our universe by the decay of a false vacuum. Negative spatial curvature is one possibility, but the window for its detection is now small. However, another possible signal is a suppression of the cosmic microwave background (CMB) power spectrum at large angles. This arises from the steepening of the effective potential as it interpolates between a flat inflationary plateau and the high barrier separating us from our parent vacuum. We demonstrate that these two effects can be parametrically separated in angular scale. Observationally, the steepening effect appears to be excluded at large ℓ; but it remains consistent with the slight lack of power below ℓ≈30 found by the WMAP and Planck collaborations. We give two simple models which improve the fit to the Planck data; one with observable curvature and one without. Despite cosmic variance, we argue that future CMB polarization and most importantly large-scale structure observations should be able to corroborate the Planck anomaly if it is real. If we further assume the specific theoretical setting of a landscape of metastable vacua, as suggested by string theory, we can estimate the probability of seeing a low-ℓ suppression in the CMB. There are significant theoretical uncertainties in such calculations, but we argue the probability for a detectable suppression may be as large as O(1), and in general is significantly larger than the probability of seeing curvature.

关键词： CURVATURE COSMIC background radiation PLANCK'S energy PLANCK'S constant INTERPOLATION

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How Many Kilonovae Can Be Found In Past, Present, and Future Survey datasets?

arXiv

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arXiv 2017年

作者： Scolnic, D. Kessler, R. Brout, D. Cowperthwaite, P.S. Soares-Santos, M. Annis, J. Herner, K. Y Chen, H. Sako, M. Doctor, Z. Butler, R.E. Palmese, A. Diehl, H.T. Frieman, J. Holz, D.E. Berger, E. Chornock, R. Villar, V.A. Nicholl, M. Biswas, R. Hounsell, R. Foley, R.J. Metzger, J. Rest, A. García-Bellido, J. Möller, A. Nugent, P. Abbott, T.M.C. Abdalla, F.B. Allam, S. Bechtol, K. Benoit-Lévy, A. Bertin, E. Brooks, D. Buckley-Geer, E. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Castander, F.J. Cunha, C.E. D’Andrea, C.B. da Costa, L.N. Davis, C. Doel, P. Drlica-Wagner, A. Eifler, T.F. Flaugher, B. Fosalba, P. Gaztanaga, E. Gerdes, D.W. Gruen, D. Gruendl, R.A. Gschwend, J. Gutierrez, G. Hartley, W.G. Honscheid, K. James, D.J. Johnson, M.W.G. Johnson, M.D. Krause, E. Kuehn, K. Kuhlmann, S. Lahav, O. Li, T.S. Lima, M. Maia, M.A.G. March, M. Marshall, J.L. Menanteau, F. Miquel, R. Neilsen, E. Plazas, A.A. Sanchez, E. Scarpine, V. Schubnell, M. Sevilla-Noarbe, I. Smith, M. Smith, R.C. Sobreira, F. Suchyta, E. Swanson, M.E.C. Tarle, G. Thomas, R.C. Tucker, D.L. Walker, A.R. Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Department of Ph sics and Astronom Universit of Penns lvania PhiladelphiaPA19104 United States Harvard-Smithsonian Center for Astrophysics 60 Garden Street CambridgeMA02138 United States Fermi National Accelerator Laborator P O Box 500 BataviaIL60510 United States Department of Physics Brandeis University WalthamMA02453 United States Department of Astronomy Indiana University 727 E. Third Street BloomingtonIN47405 United States Fermi National Accelerator Laboratory P.O. Box 500 BataviaIL60510 United States De artment of Ph sics & Astronom Universit Colle e London Gower Street LondonWC1E 6BT United Kingdom Department of Physics University of Chicago ChicagoIL60637 United States Enrico Fermi Institute University of Chicago ChicagoIL60637 United States Astro h sical Institute De artment of Ph sics and Astronom 251B Cli in er Lab Ohio Universit AthensOH45701 United States eScience Institute Department of Astronomy University of Washington SeattleWA98195 United States Oskar Klein Centre De artment of Ph sics Stockholm Universit StockholmSE 106 91 Sweden Department of Astronomy and Astrophysics University of California Santa Cruz 1156 High St Santa CruzCA95064 United States Department of Astronomy University of Illinois Urbana Champaign 1002 W Green St. UrbanaIL61801 United States Space Telescope Science Institute 3700 San Martin Dr. BaltimoreMD21218 United States Department of Physics and Astronomy Johns Hopkins University 3400N. Charles St. BaltimoreMD21218 United States Instituto de Fisica Teorica UAM/CSIC Universidad Autonoma de Madrid Madrid28049 Spain Research School of Astronomy and Astrophysics Australian National University ACT2601 Australia Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States Cerro Tololo Inter-American Observatory National Optical Astronomy Observatory Casilla 603 La Sere

The discovery of a kilonova (KN) associated with the Advanced LIGO (aLIGO)/Virgo event GW170817 opens up new avenues of multi-messenger astrophysics. Here, using realistic simulations, we provide estimates of the number of KNe that could be found in data from past, present and future surveys without a gravitational-wave trigger. For the simulation, we construct a spectral time-series model based on the DES-GW multi-band light-curve from the single known KN event, and we use an average of BNS rates from past studies of 103 Gpc−3/year, consistent with the 1 event found so far. Examining past and current datasets from transient surveys, the number of KNe we expect to find for ASAS-SN, SDSS, PS1, SNLS, DES, and SMT is between 0 and 0.3. We predict the number of detections per future survey to be: 8.3 from ATLAS, 10.6 from ZTF, 5.5/69 from LSST (the Deep Drilling / Wide Fast Deep), and 16.0 from WFIRST. The maximum redshift of KNe discovered for each survey is z = 0.8 for WFIRST, z = 0.25 for LSST and z = 0.04 for ZTF and ATLAS. This maximum redshift for WFIRST is well beyond the sensitivity of aLIGO and some future GW missions. For the LSST survey, we also provide contamination estimates from Type Ia and Core-collapse supernovae: after light-curve and template-matching requirements, we estimate a background of just 2 events. More broadly, we stress that future transient surveys should consider how to optimize their search strategies to improve their detection efficiency, and to consider similar analyses for GW follow-up programs. Subject headings: stars: neutron Copyright © 2017, The Authors. All rights reserved.

关键词： Surveys

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The MeerKAT international GHz tiered extragalactic exploration (MIGHTEE) survey

arXiv

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arXiv 2017年

作者： Jarvis, Matt J. Taylor, A.R. Agudo, I. Allison, James R. Deane, R.P. Frank, B. Gupta, N. Heywood, I. Maddox, N. McAlpine, K. Santos, Mario G. Scaife, A.M.M. Vaccari, M. Zwart, J.T.L. Adams, E. Bacon, D.J. Baker, A.J. Bassett, Bruce A. Best, P.N. Beswick, R. Blyth, S. Brown, Michael L. Brüggen, M. Cluver, M. Colafranceso, S. Cotter, G. Cress, C. Davé, R. Ferrari, C. Hardcastle, M.J. Hale, C. Harrison, I. Hatfield, P.W. Klöckner, H.-R. Kolwa, S. Malefahlo, E. Marubini, T. Mauch, T. Moodley, K. Morganti, R. Norris, R. Peters, J.A. Prandoni, I. Prescott, M. Oliver, S. Oozeer, N. Röttgering, H.J.A. Seymour, N. Simpson, C. Smirnov, O. Smith, D.J.B. Spekkens, K. Stil, J. Tasse, C. Van Der Heyden, K. Whittam, I.H. WIlliams, W.L. Astrophysics University of Oxford Denys Wilkinson Building Keble Road OxfordOX1 3RH United Kingdom Department of Physics and Astronomy University of the Western Cape Robert Sobukwe Road Bellville7535 South Africa Department of Astronomy University of Cape Town Rondebosch7701 South Africa Inter-University Institute for Data Intensive Astronomy University of Cape Town South Africa Apartado 3004 GranadaE-18080 Spain CSIRO Astronomy and Space Science PO Box 76 EppingNSW1710 Australia Department of Physics & Electronics Rhodes University PO Box 94 Grahamstown6140 South Africa Inter-University Centre for Astronomy and Astrophysics India ASTRON Netherlands Institute for Radio Astronomy Postbus 2 Dwingeloo7990AA Netherlands Square Kilometre Array South Africa Pinelands Cape Town7405 South Africa Jodrell Bank Centre for Astrophysics School of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PL United Kingdom INAF Istituto di Radioastronomia via Gobetti 101 Bologna40129 Italy Institute of Cosmology & Gravitation University of Portsmouth Dennis Sciama Building PortsmouthPO1 3FX United Kingdom Department of Physics and Astronomy Rutgers The State University of New Jersey 136 Frelinghuysen Road PiscatawayNJ08854-8019 United States African Institute for Mathematical Sciences 6-8 Melrose Road Muizenberg7945 South Africa Department of Maths and Applied Maths University of Cape Town Cape Town South Africa South African Astronomical Observatory Observatory Cape Town7925 South Africa SUPA Institute for Astronomy Royal Observatory EdinburghEH9 3HJ United Kingdom Hamburger Sternwarte Universität Hamburg Gojenbergsweg 112 HamburgD-21029 Germany School of Physics University of the Witwatersrand Private Bag 3 Johannesburg2050 South Africa CHPC CSIR 15 Lower Hope Rd Rosebank7700 South Africa Laboratoire Lagrange Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Blvd de l'Observatoire CS 34229 Nice Cedex

The MIGHTEE large survey project will survey four of the most well-studied extragalactic deep fields, totalling 20 square degrees to µJy sensitivity at Giga-Hertz frequencies, as well as an ultra-deep image of a single ∼1 deg2 MeerKAT pointing. The observations will provide radio continuum, spectral line and polarisation information. As such, MIGHTEE, along with the excellent multi-wavelength data already available in these deep fields, will allow a range of science to be achieved. Specifically, MIGHTEE is designed to significantly enhance our understanding of, (i) the evolution of AGN and star-formation activity over cosmic time, as a function of stellar mass and environment, free of dust obscuration;(ii) the evolution of neutral hydrogen in the Universe and how this neutral gas eventually turns into stars after moving through the molecular phase, and how efficiently this can fuel AGN activity;(iii) the properties of cosmic magnetic fields and how they evolve in clusters, filaments and galaxies. MIGHTEE will reach similar depth to the planned SKA all-sky survey, and thus will provide a pilot to the cosmology experiments that will be carried out by the SKA over a much larger survey volume. Copyright © 2017, The Authors. All rights reserved.

关键词： Surveys

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Erratum: 'The Chandra Multi-wavelength Project: Optical Spectroscopy and the Broadband Spectral Energy Distributions of X-ray-selected AGNs' (2012, ApJS, 200, 17)

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The Astrophysical Journal Supplement Series 2017年第2期231卷

作者： Markos Trichas Paul J. Green John D. Silverman Tom Aldcroft Wayne Barkhouse Robert A. Cameron Anca Constantin Sara L. Ellison Craig Foltz Daryl Haggard Buell T. Jannuzi Dong-Woo Kim Herman L. Marshall Amy Mossman Laura M. Pérez Encarni Romero-Colmenero Angel Ruiz Malcolm G. Smith Paul S. Smith Guillermo Torres Daniel R. Wik Belinda J. Wilkes Angie Wolfgang Harvard-Smithsonian Center for Astrophysics Cambridge MA 02138 Institute for the Physics and Mathematics of the universe (IPMU) University of Tokyo Kashiwanoha 5-1-5 Kashiwa-shi Chiba 277-8568 Japan Department of Physics and Astrophysics University of North Dakota Grand Forks ND 58202 USA W. W. Hansen Experimental Physics Laboratory Kavli Institute for Particle Astrophysics and Cosmology Department of Physics and SLAC National Accelerator Laboratory Stanford University Stanford CA 94305 USA Department of Physics and Astronomy James Madison University PHCH Harrisonburg VA 22807 Department of Physics and Astronomy University of Victoria Victoria British Columbia V8P 1A1 Canada Division of Astronomical Sciences National Science Foundation 4201 Wilson Blvd. Arlington VA 22230 Center for Interdisciplinary Exploration and Research in Astrophysics Northwestern University 2145 Sheridan Road Evanston IL 60208 USA NOAO Kitt Peak National Observatory Tucson AZ 85726 USA Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology 77 Massachusetts Ave. Cambridge MA 02139 USA Department of Astronomy California Institute of Technology 1200 East California Blvd Pasadena CA 91125 USA South African Astronomical Observatory P.O. Box 9 Observatory 7935 South Africa Osservatorio Astronomico di Brera—INAF Milan Italy Cerro Tololo Interamerican Observatory La Serena Chile Steward Observatory University of Arizona 933 Cherry Ave. Tucson AZ 85721 USA NASA Goddard Space Flight Center Greenbelt MD 20771 Department of Astronomy and Astrophysics University of California Santa Cruz CA 95064 USA

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Measurement of the Inelastic Proton-Proton Cross Section at s=13 TeV with the ATLAS Detector at the LHC

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Physical Review Letters 2016年第18期117卷 182002-182002页

作者： M. Aaboud G. Aad B. Abbott J. Abdallah O. Abdinov B. Abeloos R. Aben O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye A. A. Affolder T. Agatonovic-Jovin J. Agricola J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob B. Ali M. Aliev G. Alimonti J. Alison S. P. Alkire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani M. Alstaty B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi C. Antel M. Antonelli A. Antonov F. Anulli M. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster L. J. Armitage O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi B. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay K. Augsten G. Avolio B. Axen M. K. Ayoub G. Azuelos M. A. Baak A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes M. Backhaus P. Bagiacchi P. Bagnaia Y. Bai J. T. Baines O. K. Baker E. M. Baldin P. Balek T. Balestri F. Balli W. K. Balunas E. Banas Sw. Banerjee A. A. E. Bannoura L. Barak E. L. Barberio D. Barberis M. Barbero T. Barillari M-S Barisits T. Barklow N. Barlow S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska A. Baroncelli G. Barone A. J. Barr L. Barranco Navarro F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos A. Basalaev A. Bassalat R. L. Bates S. J. Batista J. R. Batley M. Battaglia M. Bauce F. Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA University of Iowa Iowa City Iowa USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 Oregon USA Department of Physics Stockholm University 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 Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom 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 Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nu

This Letter presents a measurement of the inelastic proton-proton cross section using 60 μb−1 of pp collisions at a center-of-mass energy s of 13 TeV with the ATLAS detector at the LHC. Inelastic interactions are selected using rings of plastic scintillators in the forward region (2.07<|η|<3.86) of the detector. A cross section of 68.1±1.4 mb is measured in the fiducial region ξ=MX2/s>10−6, where MX is the larger invariant mass of the two hadronic systems separated by the largest rapidity gap in the event. In this ξ range the scintillators are highly efficient. For diffractive events this corresponds to cases where at least one proton dissociates to a system with MX>13 GeV. The measured cross section is compared with a range of theoretical predictions. When extrapolated to the full phase space, a cross section of 78.1±2.9 mb is measured, consistent with the inelastic cross section increasing with center-of-mass energy.

关键词： particle interactions particle production Quark & gluon jets Hadron colliders

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Observation of Long-Range Elliptic Azimuthal Anisotropies in s=13 and 2.76 TeV pp Collisions with the ATLAS Detector

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Physical Review Letters 2016年第17期116卷 172301-172301页

作者： G. Aad B. Abbott J. Abdallah O. Abdinov R. Aben M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye A. A. Affolder T. Agatonovic-Jovin J. Agricola J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison S. P. Alkire B. M. M. Allbrooke P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi B. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay K. Augsten M. Aurousseau G. Avolio B. Axen M. K. Ayoub G. Azuelos M. A. Baak A. E. Baas M. J. Baca C. Bacci H. Bachacou K. Bachas M. Backes M. Backhaus P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker E. M. Baldin P. Balek T. Balestri F. Balli W. K. Balunas E. Banas Sw. Banerjee A. A. E. Bannoura L. Barak E. L. Barberio D. Barberis M. Barbero T. Barillari M. Barisonzi T. Barklow N. Barlow S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos A. Basalaev A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley M. Battaglia M. Bauce F. Bauer H. S. Bawa J. B. Beach CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma 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 Netherlands Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario 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 Oregon USA Department of Physics Stockholm University 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 Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom 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 Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Fysiska inst

ATLAS has measured two-particle correlations as a function of the relative azimuthal angle, Δϕ, and pseudorapidity, Δη, in s=13 and 2.76 TeV pp collisions at the LHC using charged particles measured in the pseudorapidity interval |η|<2.5. The correlation functions evaluated in different intervals of measured charged-particle multiplicity show a multiplicity-dependent enhancement at Δϕ∼0 that extends over a wide range of Δη, which has been referred to as the “ridge.” Per-trigger-particle yields, Y(Δϕ), are measured over 2<|Δη|<5. For both collision energies, the Y(Δϕ) distribution in all multiplicity intervals is found to be consistent with a linear combination of the per-trigger-particle yields measured in collisions with less than 20 reconstructed tracks, and a constant combinatoric contribution modulated by cos(2Δϕ). The fitted Fourier coefficient, v2,2, exhibits factorization, suggesting that the ridge results from per-event cos(2ϕ) modulation of the single-particle distribution with Fourier coefficients v2. The v2 values are presented as a function of multiplicity and transverse momentum. They are found to be approximately constant as a function of multiplicity and to have a pT dependence similar to that measured in p+Pb and Pb+Pb collisions. The v2 values in the 13 and 2.76 TeV data are consistent within uncertainties. These results suggest that the ridge in pp collisions arises from the same or similar underlying physics as observed in p+Pb collisions, and that the dynamics responsible for the ridge has no strong s dependence.

关键词： Collective flow particle & resonance production Relativistic heavy-ion collisions

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Search for Higgs and Z Boson Decays to ϕγ with the ATLAS Detector

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Physical Review Letters 2016年第11期117卷 111802-111802页

作者： M. Aaboud G. Aad B. Abbott J. Abdallah O. Abdinov B. Abeloos R. Aben O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye A. A. Affolder T. Agatonovic-Jovin J. Agricola J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob B. Ali M. Aliev G. Alimonti J. Alison S. P. Alkire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani M. Alstaty B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi C. Antel M. Antonelli A. Antonov F. Anulli M. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster L. J. Armitage O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi B. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay K. Augsten G. Avolio B. Axen M. K. Ayoub G. Azuelos M. A. Baak A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes M. Backhaus P. Bagiacchi P. Bagnaia Y. Bai J. T. Baines O. K. Baker E. M. Baldin P. Balek T. Balestri F. Balli W. K. Balunas E. Banas Sw. Banerjee A. A. E. Bannoura L. Barak E. L. Barberio D. Barberis M. Barbero T. Barillari M-S Barisits T. Barklow N. Barlow S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska A. Baroncelli G. Barone A. J. Barr L. Barranco Navarro F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos A. Basalaev A. Bassalat R. L. Bates S. J. Batista J. R. Batley M. Battaglia M. Bauce F. Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA University of Iowa Iowa City Iowa USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 Oregon USA Department of Physics Stockholm University 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 Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom 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 Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Department of Physics Boston University Boston Massachusetts USA Join

A search for the decays of the Higgs and Z bosons to a ϕ meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of 2.7 fb−1 collected at s=13 TeV with the ATLAS detector at the LHC. No significant excess of events is observed above the background, and 95% confidence level upper limits on the branching fractions of the Higgs and Z boson decays to ϕγ of 1.4×10−3 and 8.3×10−6, respectively, are obtained.

关键词： Electroweak interaction Leptonic, semileptonic & radiative decays Higgs bosons Strange quark Hadron colliders

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Measurement of the ZZ Production Cross Section in pp Collisions at s=13 TeV with the ATLAS Detector

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Physical Review Letters 2016年第10期116卷 101801-101801页

作者： G. Aad B. Abbott J. Abdallah O. Abdinov B. Abeloos R. Aben M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye A. A. Affolder T. Agatonovic-Jovin J. Agricola J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison S. P. Alkire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster L. J. Armitage O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi B. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay K. Augsten G. Avolio B. Axen M. K. Ayoub G. Azuelos M. A. Baak A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes M. Backhaus P. Bagiacchi P. Bagnaia Y. Bai J. T. Baines O. K. Baker E. M. Baldin P. Balek T. Balestri F. Balli W. K. Balunas E. Banas Sw. Banerjee A. A. E. Bannoura L. Barak E. L. Barberio D. Barberis M. Barbero T. Barillari M. Barisonzi T. Barklow N. Barlow S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska A. Baroncelli G. Barone A. J. Barr L. Barranco Navarro F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos A. Basalaev A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley M. Battaglia M. Bauce F. Bauer H. S. Ba CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA 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 Oregon USA Department of Physics Stockholm University 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 Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom 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 Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sez

The ZZ production cross section in proton-proton collisions at 13 TeV center-of-mass energy is measured using 3.2 fb−1 of data recorded with the ATLAS detector at the Large Hadron Collider. The considered Z boson candidates decay to an electron or muon pair of mass 66–116 GeV. The cross section is measured in a fiducial phase space reflecting the detector acceptance. It is also extrapolated to a total phase space for Z bosons in the same mass range and of all decay modes, giving 16.7−2.0+2.2(stat)+0.9−0.7(syst)+1.0−0.7(lumi) pb. The results agree with standard model predictions.

关键词： Electroweak interaction particle production W & Z bosons Hadron colliders Multi-purpose particle detectors

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