ERIS, first generation becoming second generation, or re-vitalizing an AO instrument

Adaptive Optics for Extremely Large Telescopes, 2017 AO4ELT5 2017-June (2017)

Authors:

A Cortes, R Davies, H Feutchgruber, E Sturm, M Hartl, F Eisenhauer, H Huber, E Wiezorrek, M Plattner, A Buron, J Schubert, S Gillessen, C Rau, N Förster-Schreiber, A Baruffalo, B Salasnich, D Fatinel, S Esposito, A Riccardi, G Agapito, JV Biliotti, R Briguglio, L Carbonaro, A Puglisi, M Xompero, G Cresci, C Giordano, F Mannucci, D Ferruzzi, D Pearson, W Taylor, C Waring, M MacIntosh, D Lunney, D Henry, J Lightfood, X Gao, B Biller, S Quanz, A Glauser, H Schmid, S March, J Kuehn, M Kenworthy, C Keller, F Snik, M Dolci, A Valentino, A Di Cianno, G Di Rico, M Kasper, H Kuntschner, A Glindemann, R Dorn, H Jeroen

Abstract:

Within the VLT instrumentation program, the second generation instrument ERIS (Enhanced Resolution Imager and Spectrograph) combines two key scientifically successful elements of the VLT first generation instrumentation program: It consists of a full renovation of the integral field spectrograph SPIFFI and a new near-IR camera NIX, implementing the most scientifically important imaging modes offered so far by NACO (imaging in the J to M bands, astrometry, Sparse Aperture Masking and Apodizing Phase Plate (APP) coronagraphy). Both diffraction limited sub-systems of ERIS make use of the latest AO technologies with the newly installed AOF (AO Facility) Deformable Secondary Mirror with 1170 actuators and a new laser guide star system. We will describe the changes that will be implemented, give a summary of what SINFONI is currently achieving, and present what to expect from the performance upgrade. With instruments becoming more complex and therefore increasing development times, we describe the challenges to improve image quality, spectral and spatial resolution on the same focus of a VLT UT, which could become valuable lessons for the extension of the life of actual instruments and of future ones. We will address the impact of the aging of the instrument and what critical parts to consider in the design in view of future upgrades, to possibly extend the performances, capabilities and lifetime at lower development costs.

Rapid radio flaring during an anomalous outburst of SS Cyg

Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press 467:1 (2017) L31-L35

Authors:

Kunal P Mooley, James CA Miller-Jones, Robert Fender, Gregory R Sivakoff, Clare Rumsey, Yvette Perrott, David Titterington, Keith Grainge, Thomas D Russell, Steven H Carey, Jack Hickish, Nima Razavi-Ghods, Anna Scaife, Paul Scott, Elisabeth O Waagen

Abstract:

The connection between accretion and jet production in accreting white dwarf binary systems, especially dwarf novae, is not well understood. Radio wavelengths provide key insights into the mechanisms responsible for accelerating electrons, including jets and outflows. Here we present densely-sampled radio coverage, obtained with the Arcminute MicroKelvin Imager Large Array, of the dwarf nova SS Cyg during its February 2016 anomalous outburst. The outburst displayed a slower rise (3 days mag^-1) in the optical than typical ones, and lasted for more than 3 weeks. Rapid radio flaring on timescales <1 hour was seen throughout the outburst. The most intriguing behavior in the radio was towards the end of the outburst where a fast, luminous (“giant”), flare peaking at ~20 mJy and lasting for 15 minutes was observed. This is the first time that such a flare has been observed in SS Cyg, and insufficient coverage could explain its non-detection in previous outbursts. These data, together with past radio observations, are consistent with synchrotron emission from plasma ejection events as being the origin of the radio flares. However, the production of the giant flare during the declining accretion rate phase remains unexplained within the standard accretion-jet framework and appears to be markedly different to similar patterns of behavior in X-ray binaries.

The CMS trigger system

Journal of Instrumentation IOP Publishing 12:01 (2017) p01020-p01020

Authors:

V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, E Asilar, T Bergauer, J Brandstetter, E Brondolin, M Dragicevic, J Erö, M Flechl, M Friedl, R Frühwirth, VM Ghete, C Hartl, N Hörmann, J Hrubec, M Jeitler, V Knünz, A König, M Krammer, I Krätschmer, D Liko, T Matsushita, I Mikulec, D Rabady, B Rahbaran, H Rohringer, J Schieck, R Schöfbeck, J Strauss, W Treberer-Treberspurg, W Waltenberger, C-E Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Alderweireldt, T Cornelis, EA De Wolf, X Janssen, A Knutsson, J Lauwers, S Luyckx, M Van De Klundert, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, S Abu Zeid, F Blekman, J D'Hondt, N Daci, I De Bruyn, K Deroover, N Heracleous, J Keaveney, S Lowette, L Moreels, A Olbrechts, Q Python, D Strom, S Tavernier, W Van Doninck, P Van Mulders, GP Van Onsem, I Van Parijs, P Barria, H Brun, C Caillol, B Clerbaux, G De Lentdecker, G Fasanella, L Favart, A Grebenyuk, G Karapostoli, T Lenzi, A Léonard, T Maerschalk, A Marinov, L Perniè, A Randle-conde, T Reis, T Seva, C Vander Velde, P Vanlaer, R Yonamine, F Zenoni, F Zhang, K Beernaert, L Benucci, A Cimmino, S Crucy, D Dobur, A Fagot, G Garcia, M Gul, J Mccartin, AA Ocampo Rios, D Poyraz, D Ryckbosch, S Salva, M Sigamani, N Strobbe, M Tytgat, W Van Driessche, E Yazgan, N Zaganidis, S Basegmez, C Beluffi, O Bondu, S Brochet, G Bruno, A Caudron, L Ceard, GG Da Silveira, C Delaere, D Favart, L Forthomme, A Giammanco, J Hollar, A Jafari, P Jez, M Komm, V Lemaitre, A Mertens, M Musich, C Nuttens, L Perrini, A Pin, K Piotrzkowski, A Popov, L Quertenmont, M Selvaggi, M Vidal Marono, N Beliy, GH Hammad, WL Aldá Júnior, FL Alves, GA Alves, L Brito, M Correa Martins, M Hamer, C Hensel, C Mora Herrera, A Moraes, ME Pol, P Rebello Teles, E Belchior Batista Das Chagas, W Carvalho, J Chinellato, A Custódio, EM Da Costa, D De Jesus Damiao, C De Oliveira Martins, S Fonseca De Souza, LM Huertas Guativa, H Malbouisson, D Matos Figueiredo, L Mundim, H Nogima, WL Prado Da Silva, A Santoro, A Sznajder, EJ Tonelli Manganote, A Vilela Pereira, S Ahuja, CA Bernardes, A De Souza Santos, S Dogra, TR Fernandez Perez Tomei, EM Gregores, PG Mercadante, CS Moon, SF Novaes, Sandra S Padula, D Romero Abad, JC Ruiz Vargas, A Aleksandrov, R Hadjiiska, P Iaydjiev, M Rodozov, S Stoykova, G Sultanov, M Vutova, A Dimitrov, I Glushkov, L Litov, B Pavlov, P Petkov, M Ahmad, JG Bian, GM Chen, HS Chen, M Chen, T Cheng, R Du, CH Jiang, R Plestina, F Romeo, SM Shaheen, A Spiezia, J Tao, C Wang, Z Wang, H Zhang, C Asawatangtrakuldee, Y Ban, Q Li, S Liu, Y Mao, SJ Qian, D Wang, Z Xu, C Avila, A Cabrera, LF Chaparro Sierra, C Florez, JP Gomez, B Gomez Moreno, JC Sanabria, N Godinovic, D Lelas, I Puljak, PM Ribeiro Cipriano, Z Antunovic, M Kovac, V Brigljevic, K Kadija, J Luetic, S Micanovic, L Sudic, A Attikis, G Mavromanolakis, J Mousa, C Nicolaou, F Ptochos, PA Razis, H Rykaczewski, M Bodlak, M Finger, M Finger, Y Assran, M El Sawy, S Elgammal, A Ellithi Kamel, MA Mahmoud, B Calpas, M Kadastik, M Murumaa, M Raidal, A Tiko, C Veelken, P Eerola, J Pekkanen, M Voutilainen, J Härkönen, V Karimäki, R Kinnunen, T Lampén, K Lassila-Perini, S Lehti, T Lindén, P Luukka, T Mäenpää, T Peltola, E Tuominen, J Tuominiemi, E Tuovinen, L Wendland, J Talvitie, T Tuuva, M Besancon, F Couderc, M Dejardin, D Denegri, B Fabbro, JL Faure, C Favaro, F Ferri, S Ganjour, A Givernaud, P Gras, G Hamel de Monchenault, P Jarry, E Locci, M Machet, J Malcles, J Rander, A Rosowsky, M Titov, A Zghiche, I Antropov, S Baffioni, F Beaudette, P Busson, L Cadamuro, E Chapon, C Charlot, T Dahms, O Davignon, N Filipovic, A Florent, R Granier de Cassagnac, S Lisniak, L Mastrolorenzo, P Miné, IN Naranjo, M Nguyen, C Ochando, G Ortona, P Paganini, P Pigard, S Regnard, R Salerno, JB Sauvan, Y Sirois, T Strebler, Y Yilmaz, A Zabi, J-L Agram, J Andrea, A Aubin, D Bloch, J-M Brom, M Buttignol, EC Chabert, N Chanon, C Collard, E Conte, X Coubez, J-C Fontaine, D Gelé, U Goerlach, C Goetzmann, A-C Le Bihan, JA Merlin, K Skovpen, P Van Hove, S Gadrat, S Beauceron, C Bernet, G Boudoul, E Bouvier, CA Carrillo Montoya, R Chierici, D Contardo, B Courbon, P Depasse, H El Mamouni, J Fan, J Fay, S Gascon, M Gouzevitch, B Ille, F Lagarde, IB Laktineh, M Lethuillier, L Mirabito, AL Pequegnot, S Perries, JD Ruiz Alvarez, D Sabes, L Sgandurra, V Sordini, M Vander Donckt, P Verdier, S Viret, T Toriashvili, Z Tsamalaidze, C Autermann, S Beranek, M Edelhoff, L Feld, A Heister, MK Kiesel, K Klein, M Lipinski, A Ostapchuk, M Preuten, F Raupach, S Schael, JF Schulte, T Verlage, H Weber, B Wittmer, V Zhukov, M Ata, M Brodski, E Dietz-Laursonn, D Duchardt, M Endres, M Erdmann, S Erdweg, T Esch, R Fischer, A Güth, T Hebbeker, C Heidemann, K Hoepfner, D Klingebiel, S Knutzen, P Kreuzer, M Merschmeyer, A Meyer, P Millet, M Olschewski, K Padeken, P Papacz, T Pook, M Radziej, H Reithler, M Rieger, F Scheuch, L Sonnenschein, D Teyssier, S Thüer, V Cherepanov, Y Erdogan, G Flügge, H Geenen, M Geisler, F Hoehle, B Kargoll, T Kress, Y Kuessel, A Künsken, J Lingemann, A Nehrkorn, A Nowack, IM Nugent, C Pistone, O Pooth, A Stahl, M Aldaya Martin, I Asin, N Bartosik, O Behnke, U Behrens, AJ Bell, K Borras, A Burgmeier, A Campbell, S Choudhury, F Costanza, C Diez Pardos, G Dolinska, S Dooling, T Dorland, G Eckerlin, D Eckstein, T Eichhorn, G Flucke, E Gallo, J Garay Garcia, A Geiser, A Gizhko, P Gunnellini, J Hauk, M Hempel, H Jung, A Kalogeropoulos, O Karacheban, M Kasemann, P Katsas, J Kieseler, C Kleinwort, I Korol, W Lange, J Leonard, K Lipka, A Lobanov, W Lohmann, R Mankel, I Marfin, I-A Melzer-Pellmann, AB Meyer, G Mittag, J Mnich, A Mussgiller, S Naumann-Emme, A Nayak, E Ntomari, H Perrey, D Pitzl, R Placakyte, A Raspereza, B Roland, MÖ Sahin, P Saxena, T Schoerner-Sadenius, M Schröder, C Seitz, S Spannagel, KD Trippkewitz, R Walsh, C Wissing, V Blobel, M Centis Vignali, AR Draeger, J Erfle, E Garutti, K Goebel, D Gonzalez, M Görner, J Haller, M Hoffmann, RS Höing, A Junkes, R Klanner, R Kogler, N Kovalchuk, T Lapsien, T Lenz, I Marchesini, D Marconi, M Meyer, D Nowatschin, J Ott, F Pantaleo, T Peiffer, A Perieanu, N Pietsch, J Poehlsen, D Rathjens, C Sander, C Scharf, H Schettler, P Schleper, E Schlieckau, A Schmidt, J Schwandt, V Sola, H Stadie, G Steinbrück, H Tholen, D Troendle, E Usai, L Vanelderen, A Vanhoefer, B Vormwald, M Akbiyik, C Barth, C Baus, J Berger, C Böser, E Butz, T Chwalek, F Colombo, W De Boer, A Descroix, A Dierlamm, S Fink, F Frensch, R Friese, M Giffels, A Gilbert, D Haitz, F Hartmann, SM Heindl, U Husemann, I Katkov, A Kornmayer, P Lobelle Pardo, B Maier, H Mildner, MU Mozer, T Müller, Th Müller, M Plagge, G Quast, K Rabbertz, S Röcker, F Roscher, G Sieber, HJ Simonis, FM Stober, R Ulrich, J Wagner-Kuhr, S Wayand, M Weber, T Weiler, C Wöhrmann, R Wolf, G Anagnostou, G Daskalakis, T Geralis, VA Giakoumopoulou, A Kyriakis, D Loukas, A Psallidas, I Topsis-Giotis, A Agapitos, S Kesisoglou, A Panagiotou, N Saoulidou, E Tziaferi, I Evangelou, G Flouris, C Foudas, P Kokkas, N Loukas, N Manthos, I Papadopoulos, E Paradas, J Strologas, G Bencze, C Hajdu, A Hazi, P Hidas, D Horvath, F Sikler, V Veszpremi, G Vesztergombi, AJ Zsigmond, N Beni, S Czellar, J Karancsi, J Molnar, Z Szillasi, M Bartók, A Makovec, P Raics, ZL Trocsanyi, B Ujvari, P Mal, K Mandal, DK Sahoo, N Sahoo, SK Swain, S Bansal, SB Beri, V Bhatnagar, R Chawla, R Gupta, U Bhawandeep, AK Kalsi, A Kaur, M Kaur, R Kumar, A Mehta, M Mittal, JB Singh, G Walia, Ashok Kumar, A Bhardwaj, BC Choudhary, RB Garg, A Kumar, S Malhotra, M Naimuddin, N Nishu, K Ranjan, R Sharma, V Sharma, S Bhattacharya, K Chatterjee, S Dey, S Dutta, Jain, N Majumdar, A Modak, K Mondal, S Mukherjee, S Mukhopadhyay, A Roy, D Roy, S Roy Chowdhury, S Sarkar, M Sharan, A Abdulsalam, R Chudasama, D Dutta, V Jha, V Kumar, AK Mohanty, LM Pant, P Shukla, A Topkar, T Aziz, S Banerjee, S Bhowmik, RM Chatterjee, RK Dewanjee, S Dugad, S Ganguly, S Ghosh, M Guchait, A Gurtu, G Kole, S Kumar, B Mahakud, M Maity, G Majumder, K Mazumdar, S Mitra, GB Mohanty, B Parida, T Sarkar, N Sur, B Sutar, N Wickramage, S Chauhan, S Dube, K Kothekar, S Sharma, H Bakhshiansohi, H Behnamian, SM Etesami, A Fahim, R Goldouzian, M Khakzad, M Mohammadi Najafabadi, M Naseri, S Paktinat Mehdiabadi, F Rezaei Hosseinabadi, B Safarzadeh, M Zeinali, M Felcini, M Grunewald, M Abbrescia, C Calabria, C Caputo, A Colaleo, D Creanza, L Cristella, N De Filippis, M De Palma, L Fiore, G Iaselli, G Maggi, M Maggi, G Miniello, S My, S Nuzzo, A Pompili, G Pugliese, R Radogna, A Ranieri, G Selvaggi, L Silvestris, R Venditti, P Verwilligen, G Abbiendi, C Battilana, AC Benvenuti, D Bonacorsi, S Braibant-Giacomelli, L Brigliadori, R Campanini, P Capiluppi, A Castro, FR Cavallo, SS Chhibra, G Codispoti, M Cuffiani, GM Dallavalle, F Fabbri, A Fanfani, D Fasanella, P Giacomelli, C Grandi, L Guiducci, S Marcellini, G Masetti, A Montanari, FL Navarria, A Perrotta, AM Rossi, T Rovelli, GP Siroli, N Tosi, R Travaglini, G Cappello, M 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Zucchetta, G Zumerle, A Braghieri, A Magnani, P Montagna, SP Ratti, V Re, C Riccardi, P Salvini, I Vai, P Vitulo, L Alunni Solestizi, M Biasini, GM Bilei, D Ciangottini, L Fanò, P Lariccia, G Mantovani, M Menichelli, A Saha, A Santocchia, K Androsov, P Azzurri, G Bagliesi, J Bernardini, T Boccali, R Castaldi, MA Ciocci, R Dell'Orso, S Donato, G Fedi, L Foà, A Giassi, MT Grippo, F Ligabue, T Lomtadze, L Martini, A Messineo, F Palla, A Rizzi, A Savoy-Navarro, AT Serban, P Spagnolo, R Tenchini, G Tonelli, A Venturi, PG Verdini, L Barone, F Cavallari, G D'imperio, D Del Re, M Diemoz, S Gelli, C Jorda, E Longo, F Margaroli, P Meridiani, G Organtini, R Paramatti, F Preiato, S Rahatlou, C Rovelli, F Santanastasio, P Traczyk, N Amapane, R Arcidiacono, S Argiro, M Arneodo, R Bellan, C Biino, N Cartiglia, M Costa, R Covarelli, A Degano, N Demaria, L Finco, B Kiani, C Mariotti, S Maselli, E Migliore, V Monaco, E Monteil, MM Obertino, L Pacher, N Pastrone, M Pelliccioni, GL Pinna Angioni, F Ravera, A Romero, M Ruspa, R Sacchi, A Solano, A Staiano, U Tamponi, S Belforte, V Candelise, M Casarsa, F Cossutti, G Della Ricca, B Gobbo, C La Licata, M Marone, A Schizzi, A Zanetti, A Kropivnitskaya, SK Nam, DH Kim, GN Kim, MS Kim, DJ Kong, S Lee, YD Oh, A Sakharov, DC Son, JA Brochero Cifuentes, H Kim, TJ Kim, S Song, S Choi, Y Go, D Gyun, B Hong, M Jo, H Kim, Y Kim, B Lee, K Lee, KS Lee, S Lee, SK Park, Y Roh, HD Yoo, M Choi, H Kim, JH Kim, JSH Lee, IC Park, G Ryu, MS Ryu, Y Choi, J Goh, D Kim, E Kwon, J Lee, I Yu, V Dudenas, A Juodagalvis, J Vaitkus, I Ahmed, ZA Ibrahim, JR Komaragiri, MAB Md Ali, F Mohamad Idris, WAT Wan Abdullah, MN Yusli, E Casimiro Linares, H Castilla-Valdez, E De La Cruz-Burelo, I Heredia-De La Cruz, A Hernandez-Almada, R Lopez-Fernandez, A Sanchez-Hernandez, S Carrillo Moreno, F Vazquez Valencia, I Pedraza, HA Salazar Ibarguen, A Morelos Pineda, D Krofcheck, PH Butler, A Ahmad, M Ahmad, Q Hassan, HR Hoorani, WA Khan, T Khurshid, M Shoaib, H Bialkowska, M Bluj, B Boimska, T Frueboes, M Górski, M Kazana, K Nawrocki, K Romanowska-Rybinska, M Szleper, P Zalewski, G Brona, K Bunkowski, A Byszuk, K Doroba, A Kalinowski, K Kierzkowski, M Konecki, J Krolikowski, M Misiura, W Oklinski, M Olszewski, K Pozniak, M Walczak, W Zabolotny, P Bargassa, C Beirão Da Cruz E Silva, A Di Francesco, P Faccioli, PG Ferreira Parracho, M Gallinaro, N Leonardo, L Lloret Iglesias, F Nguyen, J Rodrigues Antunes, J Seixas, O Toldaiev, D Vadruccio, J Varela, P Vischia, S Afanasiev, P Bunin, M Gavrilenko, I Golutvin, I Gorbunov, A Kamenev, V Karjavin, V Konoplyanikov, A Lanev, A Malakhov, V Matveev, P Moisenz, V Palichik, V Perelygin, S Shmatov, S Shulha, N Skatchkov, V Smirnov, A Zarubin, V Golovtsov, Y Ivanov, V Kim, E Kuznetsova, P Levchenko, V Murzin, V Oreshkin, I Smirnov, V Sulimov, L Uvarov, S Vavilov, A Vorobyev, Yu Andreev, A Dermenev, S Gninenko, N Golubev, A Karneyeu, M Kirsanov, N Krasnikov, A Pashenkov, D Tlisov, A Toropin, V Epshteyn, V Gavrilov, N Lychkovskaya, V Popov, I Pozdnyakov, G Safronov, A Spiridonov, E Vlasov, A Zhokin, A Bylinkin, V Andreev, M Azarkin, I Dremin, M Kirakosyan, A Leonidov, G Mesyats, SV Rusakov, A Baskakov, A Belyaev, E Boos, M Dubinin, L Dudko, A Ershov, A Gribushin, A Kaminskiy, V Klyukhin, O Kodolova, I Lokhtin, I Myagkov, S Obraztsov, S Petrushanko, V Savrin, I Azhgirey, I Bayshev, S Bitioukov, V Kachanov, A Kalinin, D Konstantinov, V Krychkine, V Petrov, R Ryutin, A Sobol, L Tourtchanovitch, S Troshin, N Tyurin, A Uzunian, A Volkov, P Adzic, J Milosevic, V Rekovic, J Alcaraz Maestre, E Calvo, M Cerrada, M Chamizo Llatas, N Colino, B De La Cruz, A Delgado Peris, D Domínguez Vázquez, A Escalante Del Valle, C Fernandez Bedoya, JP Fernández Ramos, J Flix, MC Fouz, P Garcia-Abia, O Gonzalez Lopez, S Goy Lopez, JM Hernandez, MI Josa, E Navarro De Martino, A Pérez-Calero Yzquierdo, J Puerta Pelayo, A Quintario Olmeda, I Redondo, L Romero, J Santaolalla, MS Soares, C Albajar, JF de Trocóniz, M Missiroli, D 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Cepeda, S Dasu, L Dodd, S Duric, B Gomber, M Grothe, R Hall-Wilton, M Herndon, A Hervé, P Klabbers, A Lanaro, A Levine, K Long, R Loveless, A Mohapatra, I Ojalvo, T Perry, GA Pierro, G Polese, T Ruggles, T Sarangi, A Savin, A Sharma, N Smith, WH Smith, D Taylor, N Woods

The LOFAR Two-metre Sky Survey. I. Survey description and preliminary data release

Astronomy & Astrophysics EDP Sciences 598 (2017) A104

Authors:

TW Shimwell, HJA Röttgering, PN Best, Matthew J Jarvis, Et Et al.

Abstract:

The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120–168 MHz imaging survey that will eventually cover the entire northern sky. Each of the 3170 pointings will be observed for 8 h, which, at most declinations, is sufficient to produce ~5″ resolution images with a sensitivity of ~100 μJy/beam and accomplish the main scientific aims of the survey, which are to explore the formation and evolution of massive black holes, galaxies, clusters of galaxies and large-scale structure. Owing to the compact core and long baselines of LOFAR, the images provide excellent sensitivity to both highly extended and compact emission. For legacy value, the data are archived at high spectral and time resolution to facilitate subarcsecond imaging and spectral line studies. In this paper we provide an overview of the LoTSS. We outline the survey strategy, the observational status, the current calibration techniques, a preliminary data release, and the anticipated scientific impact. The preliminary images that we have released were created using a fully automated but direction-independent calibration strategy and are significantly more sensitive than those produced by any existing large-area low-frequency survey. In excess of 44 000 sources are detected in the images that have a resolution of 25″, typical noise levels of less than 0.5 mJy/beam, and cover an area of over 350 square degrees in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45°00′00″ to 57°00′00″).

Determination of the strong coupling constant α s from transverse energy-energy correlations in multijet events at s = 8 TeV using the ATLAS detector.

The European physical journal. C, Particles and fields 77:12 (2017) 872

Authors:

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Zieminska, NI Zimine, C Zimmermann, S Zimmermann, Z Zinonos, M Zinser, M Ziolkowski, L Živković, G Zobernig, A Zoccoli, R Zou, M Zur Nedden, L Zwalinski, ATLAS Collaboration

Abstract:

Measurements of transverse energy-energy correlations and their associated asymmetries in multi-jet events using the ATLAS detector at the LHC are presented. The data used correspond to s = 8 TeV proton-proton collisions with an integrated luminosity of 20.2 fb - 1 . The results are presented in bins of the scalar sum of the transverse momenta of the two leading jets, unfolded to the particle level and compared to the predictions from Monte Carlo simulations. A comparison with next-to-leading-order perturbative QCD is also performed, showing excellent agreement within the uncertainties. From this comparison, the value of the strong coupling constant is extracted for different energy regimes, thus testing the running of α s ( μ ) predicted in QCD up to scales over 1 TeV . A global fit to the transverse energy-energy correlation distributions yields α s ( m Z ) = 0.1162 ± 0.0011 (exp.) - 0.0070 + 0.0084 (theo.) , while a global fit to the asymmetry distributions yields a value of α s ( m Z ) = 0.1196 ± 0.0013 (exp.) - 0.0045 + 0.0075 (theo.) .