Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations

ArXiv 1910.03887 (2019)

Authors:

K Abe, R Akutsu, A Ali, C Alt, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, Y Asada, Y Ashida, ET Atkin, Y Awataguchi, S Ban, M Barbi, GJ Barker, G Barr, C Barry, M Batkiewicz-Kwasniak, A Beloshapkin, F Bench, V Berardi, S Berkman, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, B Bourguille, SB Boyd, D Brailsford, A Bravar, D Bravo Berguño, C Bronner, A Bubak, M Buizza Avanzini, J Calcutt, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, J Coleman, G Collazuol, L Cook, D Coplowe, A Cudd, A Dabrowska, G De Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, F Di Lodovico, N Dokania, S Dolan, O Drapier, J Dumarchez, P Dunne, L Eklund, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, R Fukuda, Y Fukuda, K Gameil, C Giganti, T Golan, M Gonin, A Gorin, M Guigue, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, NC Hastings, T Hayashino, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NT Hong Van, F Iacob, AK Ichikawa, M Ikeda, T Ishida, T Ishii, M Ishitsuka, K Iwamoto, A Izmaylov, B Jamieson, SJ Jenkins, C Jesús-Valls, M Jiang, S Johnson, P Jonsson, CK Jung, M Kabirnezhad, AC Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, SP Kasetti, Y Kataoka, T Katori, Y Kato, E Kearns, M Khabibullin, A Khotjantsev, T Kikawa, H Kim, J Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, A Konaka, LL Kormos, Y Koshio, K Kowalik, H Kubo, Y Kudenko, N Kukita, S Kuribayashi, R Kurjata, T Kutter, M Kuze, L Labarga, J Lagoda, M Lamoureux, M Laveder, M Lawe, M Licciardi, T Lindner, RP Litchfield, SL Liu, X Li, A Longhin, L Ludovici, X Lu, T Lux, LN Machado, L Magaletti, K Mahn, M Malek, S Manly, L Maret, AD Marino, JF Martin, T Maruyama, T Matsubara, K Matsushita, V Matveev, K Mavrokoridis, E Mazzucato, M McCarthy, N McCauley, KS McFarland, C McGrew, A Mefodiev, C Metelko, M Mezzetto, A Minamino, O Mineev, S Mine, M Miura, L Molina Bueno, S Moriyama, J Morrison, Th A Mueller, L Munteanu, S Murphy, Y Nagai, T Nakadaira, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, K Nakamura, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, TV Ngoc, K Niewczas, K Nishikawa, Y Nishimura, TS Nonnenmacher, F Nova, P Novella, J Nowak, JC Nugent, HM O'Keeffe, L O'Sullivan, T Odagawa, K Okumura, T Okusawa, SM Oser, RA Owen, Y Oyama, V Palladino, JL Palomino, V Paolone, WC Parker, P Paudyal, M Pavin, D Payne, GC Penn, L Pickering, C Pidcott, G Pintaudi, ES Pinzon Guerra, C Pistillo, B Popov, K Porwit, M Posiadala-Zezula, A Pritchard, B Quilain, T Radermacher, E Radicioni, B Radics, PN Ratoff, E Reinherz-Aronis, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, A Rychter, K Sakashita, F Sánchez, CM Schloesser, K Scholberg, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, A Shaykina, M Shiozawa, W Shorrock, A Shvartsman, A Smirnov, M Smy, JT Sobczyk, H Sobel, FJP Soler, Y Sonoda, J Steinmann, S Suvorov, A Suzuki, SY Suzuki, Y Suzuki, AA Sztuc, M Tada, M Tajima, A Takeda, Y Takeuchi, HK Tanaka, HA Tanaka, S Tanaka, LF Thompson, W Toki, C Touramanis, KM Tsui, T Tsukamoto, M Tzanov, Y Uchida, W Uno, M Vagins, S Valder, Z Vallari, D Vargas, G Vasseur, C Vilela, WGS Vinning, T Vladisavljevic, VV Volkov, T Wachala, J Walker, JG Walsh, Y Wang, D Wark, MO Wascko, A Weber, R Wendell, MJ Wilking, C Wilkinson, JR Wilson, RJ Wilson, K Wood, C Wret, Y Yamada, K Yamamoto, C Yanagisawa, G Yang, T Yano, K Yasutome, S Yen, N Yershov, M Yokoyama, T Yoshida, M Yu, A Zalewska, J Zalipska, K Zaremba, G Zarnecki, M Ziembicki, ED Zimmerman, M Zito, S Zsoldos, A Zykova

Abstract:

The current laws of physics do not explain the observed imbalance of matter and antimatter in the universe. Sakharov proposed that an explanation would require the violation of CP symmetry between matter and antimatter. The only CP violation observed so far is in the weak interactions of quarks, and it is too small to explain the matter-antimatter imbalance of the universe. It has been shown that CP violation in the lepton sector could generate the matter-antimatter disparity through the process called leptogenesis. The quantum mixing of neutrinos, the neutral leptons in the Standard Model, provides a potential source of CP violation through a complex phase dCP, which may have consequences for theoretical models of leptogenesis. This CP violation can be measured in muon neutrino to electron neutrino oscillations and the corresponding antineutrino oscillations, which are experimentally accessible with accelerator-produced beams as established by the T2K experiment. Until now, the value of dCP has not been significantly constrained by neutrino oscillation experiments. Here the T2K collaboration reports a measurement that favors large enhancement of the neutrino oscillation probability, excluding values of dCP which result in a large enhancement of the observed anti-neutrino oscillation probability at three standard deviations (3 sigma). The 3 sigma confidence level interval for dCP, which is cyclic and repeats every 2pi, is [-3.41,-0.03] for the so-called normal mass ordering, and [-2.54,-0.32] for the inverted mass ordering. Our results show an indication of CP violation in the lepton sector. Herein we establish methods for sensitive searches for matter-antimatter asymmetry in neutrino oscillations using accelerator-produced neutrino beams. Future measurements with larger data samples will determine whether the leptonic CP violation is larger than the quark sector CP violation.

Deep Generative Models for Fast Photon Shower Simulation in ATLAS

Computing and Software for Big Science Springer Nature 8:1 (2024) 7

Software Performance of the ATLAS Track Reconstruction for LHC Run 3

Computing and Software for Big Science Springer Nature 8:1 (2024) 9

Authors:

G Aad, B Abbott, K Abeling, NJ Abicht, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, A Ahmad, F Ahmadov, WS Ahmed, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, I Aizenberg, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, K Al Khoury, GL Alberghi, J Albert, P Albicocco, GL Albouy, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, JF Allen, CA Allendes Flores, PP Allport, A Aloisio, F Alonso, C Alpigiani, M Alvarez Estevez, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, D Amidei, SP Amor Dos Santos, KR Amos, V Ananiev, C Anastopoulos, T Andeen, JK Anders, SY Andrean, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, JA Aparisi Pozo, MA Aparo, L Aperio Bella, C Appelt, A Apyan, N Aranzabal, SJ Arbiol Val, C Arcangeletti, ATH Arce, E Arena, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, K Asai, S Asai, NA Asbah, J Assahsah, K Assamagan, R Astalos, S Atashi, RJ Atkin, M Atkinson, H Atmani, PA Atmasiddha, K Augsten, S Auricchio, AD Auriol, VA Austrup, G Avolio, K Axiotis, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, F Backman, A Badea, P Bagnaia, M Bahmani, AJ Bailey, VR Bailey, JT Baines, L Baines, OK Baker, E Bakos, D Bakshi Gupta, V Balakrishnan, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, KN Barends, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, G Barone, AJ Barr, JD Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimarães da Costa, U Barron, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, A Basan, M Baselga, A Bassalat, MJ Basso, CR Basson, RL Bates, S Batlamous, JR Batley, B Batool, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bazzano Hurrell, JB Beacham, T Beau, JY Beaucamp, PH Beauchemin, F Becherer, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, D Benchekroun, F Bendebba, Y Benhammou, M Benoit, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, F Bernon, T Berry, P Berta, A Berthold, IA Bertram, S Bethke, A Betti, AJ Bevan, NK Bhalla, M Bhamjee, S Bhatta, DS Bhattacharya, P Bhattarai, VS Bhopatkar, R Bi, RM Bianchi, G Bianco, O Biebel, R Bielski, M Biglietti, M Bindi, A Bingul, C Bini, A Biondini, CJ Birch-sykes, GA Bird, M Birman, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, A Bitadze, K Bjørke, I Bloch, C Blocker, A Blue, U Blumenschein, J Blumenthal, GJ Bobbink, VS Bobrovnikov, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, CD Booth, AG Borbély, IS Bordulev, HM Borecka-Bielska, G Borissov, D Bortoletto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, N Bouchhar, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, D Britton, D Britzger, I Brock, G Brooijmans, WK Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B Brüers, A Bruni, G Bruni, M Bruschi, N Bruscino, T Buanes, Q Buat, D Buchin, AG 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DV Dedovich, J Degens, AM Deiana, F Del Corso, J Del Peso, F Del Rio, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, PA Delsart, S Demers, M Demichev, SP Denisov, L D’Eramo, D Derendarz, F Derue, P Dervan, K Desch, C Deutsch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, C Diaconu, M Diamantopoulou, FA Dias, T Dias Do Vale, MA Diaz, FG Diaz Capriles, M Didenko, EB Diehl, L Diehl, S Díez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, J Dingfelder, I-M Dinu, SJ Dittmeier, F Dittus, F Djama, T Djobava, JI Djuvsland, C Doglioni, A Dohnalova, J Dolejsi, Z Dolezal, KM Dona, M Donadelli, B Dong, J Donini, A D’Onofrio, M D’Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, P Dougan, MT Dova, AT Doyle, MA Draguet, E Dreyer, I Drivas-koulouris, M Drnevich, AS Drobac, M Drozdova, D Du, TA du Pree, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, OA Ducu, D 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Feligioni, DE Fellers, C Feng, M Feng, Z Feng, MJ Fenton, AB Fenyuk, L Ferencz, RAM Ferguson, SI Fernandez Luengo, P Fernandez Martinez, MJV Fernoux, J Ferrando, A Ferrari, P Ferrari, R Ferrari, D Ferrere, C Ferretti, F Fiedler, P Fiedler, A Filipčič, EK Filmer, F Filthaut, MCN Fiolhais, L Fiorini, WC Fisher, T Fitschen, PM Fitzhugh, I Fleck, P Fleischmann, T Flick, M Flores, LR Flores Castillo, L Flores Sanz De Acedo, FM Follega, N Fomin, JH Foo, BC Forland, A Formica, AC Forti, E Fortin, AW Fortman, MG Foti, L Fountas, D Fournier, H Fox, P Francavilla, S Francescato, S Franchellucci, M Franchini, S Franchino, D Francis, L Franco, V Franco Lima, L Franconi, M Franklin, G Frattari, AC Freegard, WS Freund, YY Frid, J Friend, N Fritzsche, A Froch, D Froidevaux, JA Frost, Y Fu, M Fujimoto, E Fullana Torregrosa, KY Fung, E Furtado De Simas Filho, M Furukawa, J Fuster, A Gabrielli, A Gabrielli, P Gadow, G Gagliardi, LG Gagnon, EJ Gallas, BJ Gallop, KK Gan, S Ganguly, Y Gao, FM Garay Walls, B Garcia, C García, A Garcia Alonso, AG Garcia Caffaro, JE García Navarro, M Garcia-Sciveres, GL Gardner, RW Gardner, N Garelli, D Garg, RB Garg, JM Gargan, CA Garner, CM Garvey, P Gaspar, G Gaudio, V Gautam, P Gauzzi, IL Gavrilenko, A Gavrilyuk, C Gay, G Gaycken, EN Gazis, AA Geanta, CM Gee, C Gemme, MH Genest, S Gentile, AD Gentry, S George, WF George, T Geralis, P Gessinger-Befurt, ME Geyik, M Ghani, M Ghneimat, K Ghorbanian, A Ghosal, A Ghosh, A Ghosh, B Giacobbe, S Giagu, T Giani, P Giannetti, A Giannini, SM Gibson, M Gignac, DT Gil, AK Gilbert, BJ Gilbert, D Gillberg, G Gilles, NEK Gillwald, L Ginabat, DM Gingrich, MP Giordani, PF Giraud, G Giugliarelli, D Giugni, F Giuli, I Gkialas, LK Gladilin, C Glasman, GR Gledhill, G Glemža, M Glisic, I Gnesi, Y Go, M Goblirsch-Kolb, B Gocke, D Godin, B Gokturk, S Goldfarb, T Golling, MGD Gololo, D Golubkov, JP Gombas, A Gomes, G Gomes Da Silva, AJ Gomez Delegido, R Gonçalo, G Gonella, L Gonella, A Gongadze, F Gonnella, JL Gonski, RY 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The ATLAS trigger system for LHC Run 3 and trigger performance in 2022

Journal of Instrumentation IOP Publishing 19:06 (2024) P06029

Authors:

G Aad, E Aakvaag, B Abbott, K Abeling, NJ Abicht, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei

Abstract:

The ATLAS trigger system is a crucial component of the ATLAS experiment at the LHC. It is responsible for selecting events in line with the ATLAS physics programme. This paper presents an overview of the changes to the trigger and data acquisition system during the second long shutdown of the LHC, and shows the performance of the trigger system and its components in the proton-proton collisions during the 2022 commissioning period as well as its expected performance in proton-proton and heavy-ion collisions for the remainder of the third LHC data-taking period (2022–2025).

Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum

Journal of Instrumentation IOP Publishing 19:06 (2024) P06014

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, M Ady, T Adye, AA Affolder, Y Afik

Abstract:

Inelastic beam-gas collisions at the Large Hadron Collider (LHC), within a few hundred metres of the ATLAS experiment, are known to give the dominant contribution to beam backgrounds. These are monitored by ATLAS with a dedicated Beam Conditions Monitor (BCM) and with the rate of fake jets in the calorimeters. These two methods are complementary since the BCM probes backgrounds just around the beam pipe while fake jets are observed at radii of up to several metres. In order to quantify the correlation between the residual gas density in the LHC beam vacuum and the experimental backgrounds recorded by ATLAS, several dedicated tests were performed during LHC Run 2. Local pressure bumps, with a gas density several orders of magnitude higher than during normal operation, were introduced at different locations. The changes of beam-related backgrounds, seen in ATLAS, are correlated with the local pressure variation. In addition the rates of beam-gas events are estimated from the pressure measurements and pressure bump profiles obtained from calculations. Using these rates, the efficiency of the ATLAS beam background monitors to detect beam-gas events is derived as a function of distance from the interaction point. These efficiencies and characteristic distributions of fake jets from the beam backgrounds are found to be in good agreement with results of beam-gas simulations performed with the Fluka Monte Carlo programme.