Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at root s = 8 TeV proton-proton collisions using the ATLAS experiment

Journal of High Energy Physics Springer Berlin Heidelberg 10:1 (2013)

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, T Adye, S Aefsky, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen

Abstract:

A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3 fb−1 of pp collision data at s√=8s=8 TeV collected by the ATLAS experiment at the Large Hadron Collider. The sensitivity of the search is enhanced by considering the number of b-tagged jets and the scalar sum of masses of large-radius jets in an event. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model.

Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at sNN=2.76 TeV with the ATLAS Detector

Physical Review Letters American Physical Society (APS) 111:15 (2013) 152301

Authors:

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, T Adye, S Aefsky, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, A Ahmad, M Ahsan, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MA Alam, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, J-F Arguin, S Argyropoulos, E Arik, M Arik, AJ Armbruster, O Arnaez, V Arnal, A Artamonov, G Artoni, D Arutinov, S Asai, N Asbah, S Ask, B Åsman, L Asquith, K Assamagan, R Astalos, A Astbury, M Atkinson, NB Atlay, B Auerbach, E Auge, K Augsten, M Aurousseau, G Avolio, D Axen, G Azuelos, Y Azuma, MA Baak, C Bacci, AM Bach, H Bachacou, K Bachas, M Backes, M Backhaus, J Backus Mayes, E Badescu, P Bagiacchi, P Bagnaia, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, S Baker, P Balek, F Balli, E Banas, Sw Banerjee, D Banfi, A Bangert, V Bansal, HS Bansil, L Barak, SP Baranov, T Barber, EL Barberio, D Barberis, M Barbero, DY Bardin, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, A Baroncelli, G Barone, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, R Bartoldus, AE Barton, V Bartsch, A Basye, RL Bates, L Batkova, JR Batley, M Battistin, F Bauer, HS Bawa, S Beale, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, K Becker, S Becker, M Beckingham, KH Becks, AJ Beddall, A Beddall, S Bedikian, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begel, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, A Bellerive, M Bellomo, A Belloni, OL Beloborodova, K Belotskiy, O Beltramello, O Benary, D Benchekroun, K Bendtz, N Benekos, Y Benhammou, E Benhar Noccioli, JA Benitez Garcia, DP Benjamin, JR Bensinger, K Benslama, S Bentvelsen, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, E Berglund, J Beringer, C Bernard, P Bernat, R Bernhard, C Bernius, FU Bernlochner, T Berry, C Bertella, F Bertolucci, MI Besana, GJ Besjes, O Bessidskaia, N Besson, S Bethke, W Bhimji, RM Bianchi, L Bianchini, M Bianco, O Biebel, SP Bieniek, K Bierwagen, J Biesiada, M Biglietti, J Bilbao De Mendizabal, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, B Bittner, CW Black, JE Black, KM Black, D Blackburn, RE Blair, J-B Blanchard, T Blazek, I Bloch, C Blocker, J Blocki, W Blum, U Blumenschein, GJ Bobbink, VS Bobrovnikov, SS Bocchetta, A Bocci, CR Boddy, M Boehler, J Boek, TT Boek, N Boelaert, JA Bogaerts, AG Bogdanchikov, A Bogouch, C Bohm, J Bohm, V Boisvert, T Bold, V Boldea, NM Bolnet, M Bomben, M Bona, M Boonekamp, S Bordoni, C Borer, A Borisov, G Borissov, M Borri, S Borroni, J Bortfeldt, V Bortolotto, K Bos, D Boscherini, M Bosman, H Boterenbrood, J Bouchami, J Boudreau, EV Bouhova-Thacker, D Boumediene, C Bourdarios, N Bousson, S Boutouil, A Boveia, J Boyd, IR Boyko, I Bozovic-Jelisavcic, J Bracinik, P Branchini, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, SF Brazzale, B Brelier, J Bremer, K Brendlinger, R Brenner, S Bressler, TM Bristow, D Britton, FM Brochu, I Brock, R Brock, F Broggi, C Bromberg, J Bronner, G Brooijmans, T Brooks, WK Brooks, E Brost, G Brown, J Brown, PA Bruckman de Renstrom, D Bruncko, R Bruneliere, S Brunet, A Bruni, G Bruni, M Bruschi, L Bryngemark, T Buanes, Q Buat, F Bucci, J Buchanan, P Buchholz, RM Buckingham, AG Buckley, SI Buda, IA Budagov, B Budick, L Bugge, O Bulekov, AC Bundock, M Bunse, T Buran, H Burckhart, S Burdin, T Burgess, S Burke, E Busato, V Büscher, P Bussey, CP Buszello, B Butler, JM Butler, CM Buttar, JM Butterworth, W Buttinger, M Byszewski, S Cabrera Urbán, D Caforio, O Cakir, P Calafiura, G Calderini, P Calfayan, R Calkins, LP Caloba, R Caloi, D Calvet, S Calvet, R Camacho Toro, P Camarri, D Cameron, LM Caminada, R Caminal Armadans, S Campana, M Campanelli, V Canale, F Canelli, A Canepa, J Cantero, R Cantrill, T Cao, MDM Capeans Garrido, I Caprini, M Caprini, D Capriotti, M Capua, R Caputo, R Cardarelli, T Carli, G Carlino, L Carminati, S Caron, E Carquin, GD Carrillo-Montoya, AA Carter, JR Carter, J Carvalho, D Casadei, MP Casado, M Cascella, C Caso, E Castaneda-Miranda, A Castelli, V Castillo Gimenez, NF Castro, G Cataldi, P Catastini, A Catinaccio, JR Catmore, A Cattai, G Cattani, S Caughron, V Cavaliere, D Cavalli, M Cavalli-Sforza, V Cavasinni, F Ceradini, B Cerio, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, A Cervelli, SA Cetin, A Chafaq, D Chakraborty, I Chalupkova, K Chan, P Chang, B Chapleau, JD Chapman, JW Chapman, DG Charlton, V Chavda, CA Chavez Barajas, S Cheatham, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, H Chen, S Chen, X Chen, Y Chen, Y Cheng, A Cheplakov, R Cherkaoui El Moursli, V Chernyatin, E Cheu, L Chevalier, V Chiarella, G Chiefari, JT Childers, A Chilingarov, G Chiodini, AS Chisholm, RT Chislett, A Chitan, MV Chizhov, G Choudalakis, S Chouridou, BKB Chow, IA Christidi, A Christov, D Chromek-Burckhart, ML Chu, J Chudoba, G Ciapetti, AK Ciftci, R Ciftci, D Cinca, V Cindro, A Ciocio, M Cirilli, P Cirkovic, ZH Citron, M Citterio, M Ciubancan, A Clark, PJ Clark, RN Clarke, JC Clemens, B Clement, C Clement, Y Coadou, M Cobal, A Coccaro, J Cochran, S Coelli, L Coffey, JG Cogan, J Coggeshall, J Colas, B Cole, S Cole, AP Colijn, C 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Cecco, J de Graat, N De Groot, P de Jong, C De La Taille, H De la Torre, F De Lorenzi, L De Nooij, D De Pedis, A De Salvo, U De Sanctis, A De Santo, JB De Vivie De Regie, G De Zorzi, WJ Dearnaley, R Debbe, C Debenedetti, B Dechenaux, DV Dedovich, J Degenhardt, J Del Peso, T Del Prete, T Delemontex, M Deliyergiyev, A Dell’Acqua, L Dell’Asta, M Della Pietra, D della Volpe, M Delmastro, PA Delsart, C Deluca, S Demers, M Demichev, A Demilly, B Demirkoz, SP Denisov, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, PO Deviveiros, A Dewhurst, B DeWilde, S Dhaliwal, R Dhullipudi, A Di Ciaccio, L Di Ciaccio, C Di Donato, A Di Girolamo, B Di Girolamo, S Di Luise, A Di Mattia, B Di Micco, R Di Nardo, A Di Simone, R Di Sipio, MA Diaz, EB Diehl, J Dietrich, TA Dietzsch, S Diglio, K Dindar Yagci, J Dingfelder, F Dinut, C Dionisi, P Dita, S Dita, F Dittus, F Djama, T Djobava, MAB do Vale, A Do Valle Wemans, TKO Doan, D Dobos, E Dobson, J Dodd, C Doglioni, T Doherty, T Dohmae, Y Doi, J Dolejsi, Z Dolezal, BA Dolgoshein, M Donadelli, J Donini, J Dopke, A Doria, A Dos Anjos, A Dotti, MT Dova, AT Doyle, M Dris, J Dubbert, S Dube, E Dubreuil, E Duchovni, G Duckeck, D Duda, A Dudarev, F Dudziak, L Duflot, M-A Dufour, L Duguid, M Dührssen, M Dunford, H Duran Yildiz, M Düren, M Dwuznik, J Ebke, W Edson, CA Edwards, NC Edwards, W Ehrenfeld, T Eifert, G Eigen, K Einsweiler, E Eisenhandler, T Ekelof, M El Kacimi, M Ellert, S Elles, F Ellinghaus, K Ellis, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, Y Enari, OC Endner, R Engelmann, A Engl, J Erdmann, A Ereditato, D Eriksson, J Ernst, M Ernst, J Ernwein, D Errede, S Errede, E Ertel, M Escalier, H Esch, C Escobar, X Espinal Curull, B Esposito, F Etienne, AI Etienvre, E Etzion, D Evangelakou, H Evans, L Fabbri, C Fabre, G Facini, RM Fakhrutdinov, S Falciano, Y Fang, M Fanti, A Farbin, A Farilla, T Farooque, S Farrell, SM Farrington, P Farthouat, F Fassi, P Fassnacht, D Fassouliotis, B Fatholahzadeh, A Favareto, L Fayard, P Federic, OL 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Gallus, G Galster, KK Gan, RP Gandrajula, YS Gao, A Gaponenko, FM Garay Walls, F Garberson, C García, JE García Navarro, M Garcia-Sciveres, RW Gardner, N Garelli, V Garonne, C Gatti, G Gaudio, B Gaur, L Gauthier, P Gauzzi, IL Gavrilenko, C Gay, G Gaycken, EN Gazis, P Ge, Z Gecse, CNP Gee, DAA Geerts, Ch Geich-Gimbel, K Gellerstedt, C Gemme, A Gemmell, MH Genest, S Gentile, M George, S George, D Gerbaudo, A Gershon, H Ghazlane, N Ghodbane, B Giacobbe, S Giagu, V Giangiobbe, P Giannetti, F Gianotti, B Gibbard, SM Gibson, M Gilchriese, TPS Gillam, D Gillberg, AR Gillman, DM Gingrich, N Giokaris, MP Giordani, R Giordano, FM Giorgi, P Giovannini, PF Giraud, D Giugni, C Giuliani, M Giunta, BK Gjelsten, I Gkialas, LK Gladilin, C Glasman, J Glatzer, A Glazov, GL Glonti, M Goblirsch-Kolb, JR Goddard, J Godfrey, J Godlewski, M Goebel, C Goeringer, S Goldfarb, T Golling, D Golubkov, A Gomes, LS Gomez Fajardo, R Gonçalo, J Goncalves Pinto Firmino Da Costa, L Gonella, S González de la Hoz, G 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Far-infrared fine-structure line diagnostics of ultraluminous infrared galaxies

Astrophysical Journal 776:1 (2013)

Authors:

D Farrah, V Lebouteiller, HWW Spoon, J Bernard-Salas, C Pearson, D Rigopoulou, HA Smith, E González-Alfonso, DL Clements, A Efstathiou, D Cormier, J Afonso, SM Petty, K Harris, P Hurley, C Borys, A Verma, A Cooray, V Salvatelli

Abstract:

We present Herschel observations of 6 fine-structure lines in 25 ultraluminous infrared galaxies at z < 0.27. The lines, [O III]52 μm, [N III]57 μm, [O I]63 μm, [N II]122 μm, [O I]145 μm, and [C II]158 μm, are mostly single Gaussians with widths <600 km s-1 and luminosities of 107-109 LO. There are deficits in the [O I]63/L IR, [N II]/L IR, [O I]145/L IR, and [C II]/L IR ratios compared to lower luminosity systems. The majority of the line deficits are consistent with dustier H II regions, but part of the [C II] deficit may arise from an additional mechanism, plausibly charged dust grains. This is consistent with some of the [C II] originating from photodissociation regions or the interstellar medium (ISM). We derive relations between far-IR line luminosities and both the IR luminosity and star formation rate. We find that [N II] and both [O I] lines are good tracers of the IR luminosity and star formation rate. In contrast, [C II] is a poor tracer of the IR luminosity and star formation rate, and does not improve as a tracer of either quantity if the [C II] deficit is accounted for. The continuum luminosity densities also correlate with the IR luminosity and star formation rate. We derive ranges for the gas density and ultraviolet radiation intensity of 101 < n < 102.5 and 102.2 < G 0 < 103.6, respectively. These ranges depend on optical type, the importance of star formation, and merger stage. We do not find relationships between far-IR line properties and several other parameters: active galactic nucleus (AGN) activity, merger stage, mid-IR excitation, and SMBH mass. We conclude that these far-IR lines arise from gas heated by starlight, and that they are not strongly influenced by AGN activity. © 2013. The American Astronomical Society. All rights reserved.

Fast molecular outflows in luminous galaxy mergers: Evidence for quasar feedback from herschel

Astrophysical Journal 776:1 (2013)

Authors:

S Veilleux, M Meléndez, E Sturm, J Gracia-Carpio, J Fischer, E González-Alfonso, A Contursi, D Lutz, A Poglitsch, R Davies, R Genzel, L Tacconi, JA De Jong, A Sternberg, H Netzer, S Hailey-Dunsheath, A Verma, DSN Rupke, R Maiolino, SH Teng, E Polisensky

Abstract:

We report the results from a systematic search for molecular (OH 119 μm) outflows with Herschel/PACS in a sample of 43 nearby (z < 0.3) galaxy mergers, mostly ultraluminous infrared galaxies (ULIRGs) and QSOs. We find that the character of the OH feature (strength of the absorption relative to the emission) correlates with that of the 9.7 μm silicate feature, a measure of obscuration in ULIRGs. Unambiguous evidence for molecular outflows, based on the detection of OH absorption profiles with median velocities more blueshifted than -50 km s-1, is seen in 26 (70%) of the 37 OH-detected targets, suggesting a wide-angle (∼145°) outflow geometry. Conversely, unambiguous evidence for molecular inflows, based on the detection of OH absorption profiles with median velocities more redshifted than +50 km s -1, is seen in only four objects, suggesting a planar or filamentary geometry for the inflowing gas. Terminal outflow velocities of ∼-1000 km s-1 are measured in several objects, but median outflow velocities are typically ∼-200 km s-1. While the outflow velocities show no statistically significant dependence on the star formation rate, they are distinctly more blueshifted among systems with large active galactic nucleus (AGN) fractions and luminosities [log (L AGN/L⊙) ≥ 11.8 ± 0.3]. The quasars in these systems play a dominant role in driving the molecular outflows. However, the most AGN dominated systems, where OH is seen purely in emission, show relatively modest OH line widths, despite their large AGN luminosities, perhaps indicating that molecular outflows subside once the quasar has cleared a path through the obscuring material. © 2013. The American Astronomical Society. All rights reserved.

Searching for transits in the WTS with difference imaging light curves

(2013)

Authors:

Jesus Zendejas, Johannes Koppenhoefer, Roberto P Saglia, Jayne L Birkby, Simon T Hodgkin, Gabor Kovacs, David J Pinfield, Brigitta Sipocz, David Barrado, Ralf Bender, Carlos del Burgo, Michele Cappetta, Eduardo L Martin, Sebastiaan V Nefs, Arno Riffeser, Paul Steele