Performance of pile-up mitigation techniques for jets in pp collisions at √s = 8 TeV using the ATLAS detector
European Physical Journal C: Particles and Fields Springer 76 (2016) 581
Authors:
G Aad, B Abbott, J Abdallah, O Abdinov, R Aben, M Abolins, OS Abouzeid, H Abramowicz, H Abreu, R Abreu, F Ahmadov, G Aielli, H Akerstedt, TPA Åkesson, AV Akimov, GL Alberghi, J Albert, S Albrand, A Aloisio, A Alonso, F Alonso, C Alpigiani, A Altheimer, BA Gonzalez, DÁ PiquerasAbstract:
The large rate of multiple simultaneous proton–proton interactions, or pile-up, generated by the Large Hadron Collider in Run 1 required the development of many new techniques to mitigate the adverse effects of these conditions. This paper describes the methods employed in the ATLAS experiment to correct for the impact of pile-up on jet energy and jet shapes, and for the presence of spurious additional jets, with a primary focus on the large 20.3 fb−1 data sample collected at a centre-of-mass energy of s√=8 TeV . The energy correction techniques that incorporate sophisticated estimates of the average pile-up energy density and tracking information are presented. Jet-to-vertex association techniques are discussed and projections of performance for the future are considered. Lastly, the extension of these techniques to mitigate the effect of pile-up on jet shapes using subtraction and grooming procedures is presented.Search for TeV-scale gravity signatures in high-mass final states with leptons and jets with the ATLAS detector at root s=13 TeV
PHYSICS LETTERS B 760 (2016) 520-537
Authors:
M Aaboud, G Aad, B Abbott, J Abdallah, O Abdinov, B Abeloos, R Aben, OS AbouZeid, NL Abraham, 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, J Agricola, JA Aguilar-Saavedra, SP Ahlen, F Ahmadov, G Aielli, H Akerstedt, TPA Akesson, AV Akimov, GL Alberghi, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, T Alexopoulos, M Alhroob, B Ali, M Aliev, G Alimonti, J Alison, SP Alkire, BMM Allbrooke, BW Allen, PP Allport, A Aloisio, A Alonso, F Alonso, C Alpigiani, M Alstaty, BA Gonzalez, DA Piqueras, MG Alviggi, BT Amadio, K Amako, Y Amaral Coutinho, C Amelung, D Amidei, SP Amor Dos Santos, A Amorim, S Amoroso, 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, C Antel, M Antonelli, A Antonov, F Anulli, M Aoki, LA Bella, G Arabidze, Y Arai, JP Araque, ATH Arce, FA Arduh, J-F Arguin, S Argyropoulos, M Arik, AJ Armbruster, LJ Armitage, O Arnaez, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Artz, S Asai, N Asbah, A Ashkenazi, B Asman, L Asquith, K Assamagan, R Astalos, M Atkinson, NB Atlay, K Augsten, G Avolio, B Axen, MK Ayoub, G Azuelos, MA Baak, AE Baas, MJ Baca, H Bachacou, K Bachas, M Backes, M Backhaus, P Bagiacchi, P Bagnaia, Y Bai, JT Baines, OK Baker, EM Baldin, P Balek, T Balestri, F Balli, WK Balunas, E Banas, S Banerjee, AAE Bannoura, L Barak, EL Barberio, D Barberis, M Barbero, T Barillari, M-S Barisits, T Barklow, N Barlow, SL Barnes, BM Barnett, RM Barnett, Z Barnovska, A Baroncelli, G Barone, AJ Barr, L Barranco Navarro, F Barreiro, JBG Da Costa, R Bartoldus, AE Barton, P Bartos, A Basalaev, A Bassalat, RL Bates, SJ Batista, JR Batley, M Battaglia, M Bauce, F Bauer, HS Bawa, JB Beacham, MD Beattie, T Beau, PH Beauchemin, P Bechtle, HP Beck, K Becker, M Becker, M Beckingham, C Becot, AJ Beddall, A Beddall, VA Bednyakov, M Bedognetti, CP Bee, LJ Beemster, TA Beermann, M Begel, JK Behr, C Belanger-Champagne, AS Bell, G Bella, L Bellagamba, A Bellerive, M Bellomo, K Belotskiy, O Beltramello, NL Belyaev, O Benary, D Benchekroun, M Bender, K Bendtz, N Benekos, Y Benhammou, EB Noccioli, J Benitez, DP Benjamin, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, D Berge, EB Kuutmann, N Berger, J Beringer, S Berlendis, NR Bernard, C Bernius, FU Bernlochner, T Berry, P Berta, C Bertella, G Bertoli, F Bertoluccia, IA Bertram, C Bertsche, D Bertsche, GJ Besjes, OB Bylunda, M Bessner, N Besson, C Betancourt, S Bethke, AJ Bevan, RM Bianchi, L Bianchini, M Bianco, O Biebel, D Biedermann, R Bielski, NV Biesuz, M Biglietti, JB De Mendizaba, TRV Billoud, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, S Biondi, DM Bjergaard, CW Black, JE Black, KM Black, D Blackburn, RE Blair, J-B Blanchard, JE Blanco, T Blazek, I Bloch, C Blocker, W Blum, U Blumenschein, S Blunier, GJ Bobbink, VS Bobrovnikovc, SS Bocchetta, A Bocci, C Bock, M Boehler, D Boerner, JA Bogaerts, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, AS Boldyreva, M Bomben, M Bona, M Boonekamp, A Borisov, G Borissov, J Bortfeldt, D Bortoletto, V Bortolotto, K Bos, D Boscherini, M Bosman, JD Bossio Sola, J Boudreau, J Bouffard, EV Bouhova-Thacker, D Boumediene, C Bourdarios, SK Boutle, A Boveia, J Boyd, IR Boyko, J Bracinik, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, WDB Madden, K Brendlinger, AJ Brennan, L Brenner, R Brenner, S Bressler, TM Bristow, D Britton, D Britzger, FM Brochu, I Brock, R Brock, G Brooijmans, T Brooks, WK Brooks, J Brosamer, E Brost, JH Broughton, PAB de Renstrom, D Bruncko, R Bruneliere, A Bruni, G Bruni, LS Bruni, BH Brunt, M Bruschi, N Bruscino, P Bryant, L Bryngemark, T Buanes, Q Buat, P Buchholz, AG Buckley, IA Budagov, F Buehrer, MK Bugge, O Bulekov, D Bullock, H Burckhart, S Burdin, CD Burgard, B 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Zalieckas, A Zaman, S Zambito, L Zanello, D Zanzi, C Zeitnitz, M Zeman, A Zemla, JC Zeng, Q Zeng, K Zengel, O Zenin, T Zenis, D Zerwas, D Zhang, F Zhang, G Zhang, H Zhang, J Zhang, L Zhang, R 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, M 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 Zivkovic, G Zobernig, A Zoccoli, M zur Nedden, L Zwalinski, ATLAS CollaborationSearch for pair production of Higgs bosons in the bb¯bb¯ final state using proton-proton collisions at sqrt(s)=13 TeV with the ATLAS detector
Physical Review D American Physical Society 94:5 (2016) 1-29
Authors:
Cigdem Issever, AJ Barr, K Becker, L Beresford, D Bortoletto, AM Cooper-Sarkar, M Crispin Ortuzar, WJ Fawcett, JA Frost, EJ Gallas, F Guili, S Gupta, C Gwenlan, CP Hays, J Henderson, TB Huffman, CW Kalderon, K Nagai, RB Nickerson, N Norjaharuddeen, M Petrov, MA Pickering, JC-L Tseng, GHA Viehhauser, L Vigani, AR Weidberg, J ZhongAbstract:
A search for Higgs-boson pair production in the bb¯bb¯ final state is carried out with 3.2 fb−1 of proton-proton collision data collected at s√=13 TeV with the ATLAS detector. The data are consistent with the estimated background and are used to set upper limits on the production cross section of Higgs-boson pairs times branching ratio to bb¯bb¯ for both nonresonant and resonant production. In the case of resonant production of Kaluza-Klein gravitons within the Randall-Sundrum model, upper limits in the 24 to 91 fb range are obtained for masses between 600 and 3000 GeV, at the 95% confidence level. The production cross section times branching ratio for nonresonant Higgs-boson pairs is also constrained to be less than 1.22 pb, at the 95% confidence level.Boosting Higgs pair production in the bbbb final state with multivariate techniques
European Physical Journal C Springer Verlag 76:386 (2016)
Authors:
Juan Rojo, J Katharina Behr, Daniela Bortoletto, James A Frost, Nathan P Hartland, Cigdem Issever, Juan RojoAbstract:
The measurement of Higgs pair production will be a cornerstone of the LHC program in the coming years. Double Higgs production provides a crucial window upon the mechanism of electroweak symmetry breaking and has a unique sensitivity to the Higgs trilinear coupling. We study the feasibility of a measurement of Higgs pair production in the b ¯bb¯b final state at the LHC. Our analysis is based on a combination of traditional cut-based methods with state-of-the-art multivariate techniques. We account for all relevant backgrounds, including the contributions from light and charm jet mis-identification, which are ultimately comparable in size to the irreducible 4b QCD background. We demonstrate the robustness of our analysis strategy in a high pileup environment. For an integrated luminosity of L = 3 ab−1 , a signal significance of S/√ B ' 3 is obtained, indicating that the b ¯bb¯b final state alone could allow for the observation of double Higgs production at the High Luminosity LHC.Identification of high transverse momentum top quarks in pp collisions at root s=8 TeV with the ATLAS detector
JOURNAL OF HIGH ENERGY PHYSICS (2016) ARTN 093