Searches for Higgs boson pair production in the hh -> bb tau tau, gamma gamma WW*, gamma gamma bb, bbbb channels with the ATLAS detector
Physical Review D American Physical Society 92:9 (2015)
Authors:
G Aad, B Abbott, J Abdallah, Cigdem IsseverAbstract:
Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Searches for both resonant and nonresonant Higgs boson pair production are performed in the hh→bbττ, γγWW∗ final states using 20.3 fb-1 of pp collision data at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of their production is observed and 95% confidence-level upper limits on the production cross sections are set. These results are then combined with the published results of the hh→γγbb, bbbb analyses. An upper limit of 0.69 (0.47) pb on the nonresonant hh production is observed (expected), corresponding to 70 (48) times the SM gg→hh cross section. For production via narrow resonances, cross-section limits of hh production from a heavy Higgs boson decay are set as a function of the heavy Higgs boson mass. The observed (expected) limits range from 2.1 (1.1) pb at 260 GeV to 0.011 (0.018) pb at 1000 GeV. These results are interpreted in the context of two simplified scenarios of the Minimal Supersymmetric Standard Model.Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at s=8 TeV with the ATLAS detector at the LHC
Physical Review D American Physical Society (APS) 92:9 (2015) 092001
Authors:
G Aad, B Abbott, J Abdallah, O Abdinov, R Aben, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, R Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, J Adelman, S Adomeit, T Adye, AA Affolder, T Agatonovic-Jovin, JA Aguilar-Saavedra, SP Ahlen, F Ahmadov, G Aielli, H Akerstedt, TPA Åkesson, G Akimoto, AV Akimov, GL Alberghi, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, T Alexopoulos, M Alhroob, G Alimonti, L Alio, J Alison, SP Alkire, BMM Allbrooke, PP Allport, A Aloisio, A Alonso, F Alonso, C Alpigiani, A Altheimer, B Alvarez Gonzalez, D Álvarez Piqueras, MG Alviggi, BT Amadio, K Amako, Y Amaral Coutinho, C Amelung, D Amidei, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, G Amundsen, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, JK Anders, KJ Anderson, A Andreazza, V Andrei, S Angelidakis, I Angelozzi, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, G Arabidze, Y Arai, JP Araque, ATH Arce, FA Arduh, J-F Arguin, S Argyropoulos, M Arik, AJ Armbruster, O Arnaez, V Arnal, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Asai, N Asbah, A Ashkenazi, B Åsman, L Asquith, K Assamagan, R Astalos, M Atkinson, NB Atlay, B Auerbach, K Augsten, M Aurousseau, G Avolio, B Axen, MK Ayoub, G Azuelos, MA Baak, AE Baas, C Bacci, H Bachacou, K Bachas, M Backes, M Backhaus, P Bagiacchi, P Bagnaia, Y Bai, T Bain, JT Baines, OK Baker, P Balek, T Balestri, F Balli, E Banas, Sw Banerjee, AAE Bannoura, HS Bansil, L Barak, EL Barberio, D Barberis, M Barbero, T Barillari, M Barisonzi, T Barklow, N Barlow, SL Barnes, BM Barnett, RM Barnett, Z Barnovska, A Baroncelli, G Barone, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, R Bartoldus, AE Barton, P Bartos, A Basalaev, A Bassalat, A Basye, RL Bates, SJ Batista, JR Batley, M Battaglia, M Bauce, F Bauer, HS Bawa, JB Beacham, MD Beattie, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, K Becker, M Becker, S Becker, M Beckingham, C Becot, AJ Beddall, A Beddall, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begel, JK Behr, C Belanger-Champagne, WH Bell, G Bella, L Bellagamba, A Bellerive, M Bellomo, K Belotskiy, O Beltramello, O Benary, D Benchekroun, M Bender, K Bendtz, N Benekos, Y Benhammou, E Benhar Noccioli, JA Benitez Garcia, DP Benjamin, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, J Beringer, C Bernard, NR Bernard, C Bernius, FU Bernlochner, T Berry, P Berta, C Bertella, G Bertoli, F Bertolucci, C Bertsche, D Bertsche, MI Besana, GJ Besjes, O Bessidskaia Bylund, M Bessner, N Besson, C Betancourt, S Bethke, AJ Bevan, W Bhimji, RM Bianchi, L Bianchini, M Bianco, O Biebel, SP Bieniek, M Biglietti, J Bilbao De Mendizabal, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, CW Black, JE Black, KM Black, D Blackburn, RE Blair, J-B Blanchard, JE Blanco, T Blazek, I Bloch, C Blocker, W Blum, U 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Yildirim, K Yorita, R Yoshida, K Yoshihara, C Young, CJS Young, S Youssef, DR Yu, J Yu, JM Yu, J Yu, L Yuan, A Yurkewicz, I Yusuff, B Zabinski, R Zaidan, AM Zaitsev, J Zalieckas, A Zaman, S Zambito, L Zanello, D Zanzi, C Zeitnitz, M Zeman, A Zemla, K Zengel, O Zenin, T Ženiš, D Zerwas, D Zhang, F Zhang, J Zhang, L Zhang, R Zhang, X Zhang, Z Zhang, X Zhao, Y Zhao, Z Zhao, A Zhemchugov, J Zhong, B Zhou, C Zhou, L Zhou, L Zhou, N Zhou, CG Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, A Zibell, D Zieminska, NI Zimine, C Zimmermann, S Zimmermann, Z Zinonos, M Zinser, M Ziolkowski, L Živković, G Zobernig, A Zoccoli, M zur Nedden, G Zurzolo, L ZwalinskiSkewness and kurtosis as indicators of non-Gaussianity in galactic foreground maps
Journal of Cosmology and Astroparticle Physics IOP Publishing 2015:11 (2015) 019-019
Authors:
Assaf Ben-David, Sebastian von Hausegger, Andrew D JacksonSpace Warps: I. Crowd-sourcing the discovery of gravitational lenses
Monthly Notices of the Royal Astronomical Society Oxford University Press 455:2 (2015) 1171-1190
Authors:
Philip J Marshall, Aprajita Verma, Anupreeta More, Christopher P Davis, Surhud More, Amit Kapadia, Michael Parrish, Chris Snyder, Julianne Wilcox, Christine Macmillan, Elisabeth Baeten, Michael Baumer, Claude Cornen, Edwin Simpson, Chris J Lintott, David Miller, Edward Paget, Robert Simpson, Arfon M Smith, Rafael Küng, Thomas E Collett, Prasenjit SahaAbstract:
We describe SpaceWarps, a novel gravitational lens discovery service that yields samples of high purity and completeness through crowd-sourced visual inspection. Carefully produced colour composite images are displayed to volunteers via a webbased classification interface, which records their estimates of the positions of candidate lensed features. Images of simulated lenses, as well as real images which lack lenses, are inserted into the image stream at random intervals; this training set is used to give the volunteers instantaneous feedback on their performance, as well as to calibrate a model of the system that provides dynamical updates to the probability that a classified image contains a lens. Low probability systems are retired from the site periodically, concentrating the sample towards a set of lens candidates. Having divided 160 square degrees of Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) imaging into some 430,000 overlapping 82 by 82 arcsecond tiles and displaying them on the site, we were joined by around 37,000 volunteers who contributed 11 million image classifications over the course of 8 months. This Stage 1 search reduced the sample to 3381 images containing candidates; these were then refined in Stage 2 to yield a sample that we expect to be over 90% complete and 30% pure, based on our analysis of the volunteers performance on training images. We comment on the scalability of the SpaceWarps system to the wide field survey era, based on our projection that searches of 105 images could be performed by a crowd of 105 volunteers in 6 days.Study of the energy dependence of the underlying event in proton-antiproton collisions
Physical Review D American Physical Society (APS) 92:9 (2015) 092009