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where I'd like to be ...

Prof Subir Sarkar

Professor Emeritus

Research theme

  • Particle astrophysics & cosmology
  • Fundamental particles and interactions

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Particle theory
  • FASER2
Subir.Sarkar@physics.ox.ac.uk
Telephone: 01865 (2)73962
Rudolf Peierls Centre for Theoretical Physics, room 60.12
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Brief CV
  • About
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  • IceCube@Oxford
  • Publications

IceCube

Physics World 2013 Breakthrough of the Year
IceCube at Oxford

I am a member since 2004 of the IceCube collaboration which discovered cosmic high energy neutrinos and identified some of their astrophysical sources.

IceCube @ Oxford

Cherenkov Telescope Array Contributions to the 35th International Cosmic Ray Conference (ICRC2017)

(2017)

Authors:

F Acero, BS Acharya, V Acín Portella, C Adams, I Agudo, F Aharonian, I Al Samarai, A Alberdi, M Alcubierre, R Alfaro, J Alfaro, C Alispach, R Aloisio, R Alves Batista, J-P Amans, E Amato, L Ambrogi, G Ambrosi, M Ambrosio, J Anderson, M Anduze, EO Angüner, E Antolini, LA Antonelli, V Antonuccio, P Antoranz, C Aramo, M Araya, C Arcaro, T Armstrong, F Arqueros, L Arrabito, M Arrieta, K Asano, A Asano, M Ashley, P Aubert, CB Singh, A Babic, M Backes, S Bajtlik, C Balazs, M Balbo, O Ballester, J Ballet, L Ballo, A Balzer, A Bamba, R Bandiera, P Barai, C Barbier, M Barcelo, M Barkov, U Barres de Almeida, JA Barrio, D Bastieri, C Bauer, U Becciani, Y Becherini, J Becker Tjus, W Bednarek, A Belfiore, W Benbow, M Benito, D Berge, E Bernardini, MG Bernardini, M Bernardos, S Bernhard, K Bernlöhr, C Bertinelli Salucci, B Bertucci, M-A Besel, V Beshley, J Bettane, N Bhatt, W Bhattacharyya, S Bhattachryya, B Biasuzzi, G Bicknell, C Bigongiari, A Biland, A Bilinsky, R Bird, E Bissaldi, J Biteau, M Bitossi, O Blanch, P Blasi, J Blazek, C Boccato, C Bockermann, C Boehm, M Bohacova, C Boisson, J Bolmont, G Bonanno, A Bonardi, C Bonavolontà, G Bonnoli, J Borkowski, R Bose, Z Bosnjak, M Böttcher, C Boutonnet, F Bouyjou, L Bowman, V Bozhilov, C Braiding, S Brau-Nogué, J Bregeon, M Briggs, A Brill, W Brisken, D Bristow, R Britto, E Brocato, AM Brown, S Brown, K Brügge, P Brun, P Brun, F Brun, L Brunetti, G Brunetti, P Bruno, M Bryan, J Buckley, V Bugaev, R Bühler, A Bulgarelli, T Bulik, M Burton, A Burtovoi, G Busetto, S Buson, J Buss, K Byrum, A Caccianiga, R Cameron, F Canelli, R Canestrari, M Capalbi, M Capasso, F Capitanio, A Caproni, R Capuzzo-Dolcetta, P Caraveo, V Cárdenas, J Cardenzana, M Cardillo, C Carlile, S Caroff, R Carosi, A Carosi, E Carquín, J Carr, J-M Casandjian, S Casanova, E Cascone, AJ Castro-Tirado, J Castroviejo Mora, F Catalani, O Catalano, D Cauz, C Celestino Silva, S Celli, M Cerruti, E Chabanne, P Chadwick, N Chakraborty, C Champion, A Chatterjee, S Chaty, R Chaves, A Chen, X Chen, K Cheng, M Chernyakova, M Chikawa, VR Chitnis, A Christov, J Chudoba, M Cieślar, P Clark, V Coco, S Colafrancesco, P Colin, E Colombo, J Colome, S Colonges, V Conforti, V Connaughton, J Conrad, JL Contreras, R Cornat, J Cortina, A Costa, H Costantini, G Cotter, B Courty, S Covino, G Covone, P Cristofari, SJ Criswell, R Crocker, J Croston, C Crovari, J Cuadra, O Cuevas, X Cui, P Cumani, G Cusumano, A D'Aì, F D'Ammando, P D'Avanzo, D D'Urso, P Da Vela, Ø Dale, VT Dang, L Dangeon, M Daniel, I Davids, B Dawson, F Dazzi, A De Angelis, V De Caprio, R de Cássia dos Anjos, G De Cesare, A De Franco, F De Frondat, EM de Gouveia Dal Pino, I de la Calle, C De Lisio, R de los Reyes Lopez, B De Lotto, A De Luca, M De Lucia, JRT de Mello Neto, M de Naurois, E de Oña Wilhelmi, F De Palma, F De Persio, V de Souza, J Decock, C Deil, P Deiml, M Del Santo, E Delagnes, G Deleglise, M Delfino Reznicek, C Delgado, J Delgado Mengual, R Della Ceca, D della Volpe, M Detournay, J Devin, T Di Girolamo, C Di Giulio, F Di Pierro, L Di Venere, L Diaz, C Díaz, C Dib, H Dickinson, S Diebold, S Digel, A Djannati-Ataï, M Doert, A Domínguez, D Dominis Prester, I Donnarumma, D Dorner, M Doro, J-L Dournaux, T Downes, G Drake, S Drappeau, H Drass, D Dravins, L Drury, G Dubus, K Dundas Morå, A Durkalec, V Dwarkadas, J Ebr, C Eckner, E Edy, K Egberts, S Einecke, J Eisch, F Eisenkolb, TRN Ekoume, C Eleftheriadis, D Elsässer, D Emmanoulopoulos, J-P Ernenwein, P Escarate, S Eschbach, C Espinoza, P Evans, C Evoli, M Fairbairn, D Falceta-Goncalves, A Falcone, V Fallah Ramazani, K Farakos, E Farrell, G Fasola, Y Favre, E Fede, R Fedora, E Fedorova, S Fegan, M Fernandez-Alonso, A Fernández-Barral, G Ferrand, O Ferreira, M Fesquet, E Fiandrini, A Fiasson, M Filipovic, D Fink, JP Finley, C Finley, A Finoguenov, V Fioretti, M Fiorini, H Flores, L Foffano, C Föhr, MV Fonseca, L Font, G Fontaine, M Fornasa, P Fortin, L Fortson, N Fouque, B Fraga, FJ Franco, L Freixas Coromina, C Fruck, D Fugazza, Y Fujita, S Fukami, Y Fukazawa, Y Fukui, S Funk, A Furniss, M Füßling, S Gabici, A Gadola, Y Gallant, D Galloway, S Gallozzi, B Garcia, A Garcia, R García Gil, R Garcia López, M Garczarczyk, D Gardiol, F Gargano, C Gargano, S Garozzo, M Garrido-Ruiz, D Gascon, T Gasparetto, F Gaté, M Gaug, B Gebhardt, M Gebyehu, N Geffroy, B Genolini, A Ghalumyan, A Ghedina, G Ghirlanda, P Giammaria, F Gianotti, B Giebels, N Giglietto, V Gika, R Gimenes, P Giommi, F Giordano, G Giovannini, E Giro, M Giroletti, J Gironnet, A Giuliani, J-F Glicenstein, R Gnatyk, N Godinovic, P Goldoni, JL Gómez, G Gómez-Vargas, MM González, JM González, KS Gothe, D Gotz, J Goullon, T Grabarczyk, R Graciani, J Graham, P Grandi, J Granot, G Grasseau, R Gredig, AJ Green, T Greenshaw, I Grenier, S Griffiths, A Grillo, M-H Grondin, J Grube, V Guarino, B Guest, O Gueta, S Gunji, G Gyuk, D Hadasch, L Hagge, J Hahn, A Hahn, H Hakobyan, S Hara, MJ Hardcastle, T Hassan, T Haubold, A Haupt, K Hayashi, M Hayashida, H He, M Heller, JC Helo, F Henault, G Henri, G Hermann, R Hermel, J Herrera Llorente, A Herrero, O Hervet, N Hidaka, J Hinton, N Hiroshima, K Hirotani, B Hnatyk, JK Hoang, D Hoffmann, W Hofmann, J Holder, D Horan, J Hörandel, M Hörbe, D Horns, P Horvath, J Houles, T Hovatta, M Hrabovsky, D Hrupec, J-M Huet, G Hughes, D Hui, G Hull, TB Humensky, M Hussein, M Hütten, M Iarlori, Y Ikeno, JM Illa, D Impiombato, T Inada, A Ingallinera, Y Inome, S Inoue, T Inoue, Y Inoue, F Iocco, K Ioka, M Ionica, M Iori, A Iriarte, K Ishio, GL Israel, Y Iwamura, C Jablonski, A Jacholkowska, J Jacquemier, M Jamrozy, P Janecek, F Jankowsky, D Jankowsky, P Jansweijer, C Jarnot, P Jean, CA Johnson, M Josselin, I Jung-Richardt, J Jurysek, P Kaaret, P Kachru, M Kagaya, J Kakuwa, O Kalekin, R Kankanyan, A Karastergiou, M Karczewski, S Karkar, H Katagiri, J Kataoka, K Katarzyński, U Katz, N Kawanaka, L Kaye, D Kazanas, N Kelley-Hoskins, B Khélifi, DB Kieda, T Kihm, S Kimeswenger, S Kimura, S Kisaka, S Kishida, R Kissmann, W Kluźniak, J Knapen, J Knapp, J Knödlseder, B Koch, J Kocot, K Kohri, N Komin, A Kong, Y Konno, K Kosack, G Kowal, S Koyama, M Kraus, M Krause, F Krauß, F Krennrich, P Kruger, H Kubo, V Kudryavtsev, G Kukec Mezek, S Kumar, H Kuroda, J Kushida, P Kushwaha, N La Palombara, V La Parola, G La Rosa, R Lahmann, K Lalik, G Lamanna, M Landoni, D Landriu, H Landt, RG Lang, J Lapington, P Laporte, O Le Blanc, T Le Flour, P Le Sidaner, S Leach, A Leckngam, S-H Lee, WH Lee, J-P Lees, J Lefaucheur, MA Leigui de Oliveira, M Lemoine-Goumard, J-P Lenain, G Leto, R Lico, M Limon, R Lindemann, E Lindfors, L Linhoff, A Lipniacka, S Lloyd, T Lohse, S Lombardi, F Longo, M Lopez, R Lopez-Coto, T Louge, F Louis, M Louys, F Lucarelli, D Lucchesi, PL Luque-Escamilla, E Lyard, MC Maccarone, T Maccarone, E Mach, GM Madejski, G Maier, A Majczyna, P Majumdar, M Makariev, G Malaguti, A Malouf, S Maltezos, D Malyshev, D Malyshev, D Mandat, G Maneva, M Manganaro, S Mangano, P Manigot, K Mannheim, N Maragos, D Marano, A Marcowith, J Marín, M Mariotti, M Marisaldi, S Markoff, J Martí, J-M Martin, P Martin, L Martin, M Martínez, G Martínez, O Martínez, R Marx, N Masetti, P Massimino, A Mastichiadis, M Mastropietro, S Masuda, H Matsumoto, N Matthews, S Mattiazzo, G Maurin, N Maxted, M Mayer, D Mazin, MN Mazziotta, L Mc Comb, I McHardy, C Medina, A Melandri, C Melioli, D Melkumyan, S Mereghetti, J-L Meunier, T Meures, M Meyer, S Micanovic, T Michael, J Michałowski, I Mievre, J Miller, IA Minaya, T Mineo, F Mirabel, JM Miranda, R Mirzoyan, A Mitchell, T Mizuno, R Moderski, M Mohammed, L Mohrmann, C Molijn, E Molinari, R Moncada, T Montaruli, I Monteiro, D Mooney, P Moore, A Moralejo, D Morcuende-Parrilla, E Moretti, K Mori, G Morlino, P Morris, A Morselli, F Moscato, D Motohashi, E Moulin, S Mueller, R Mukherjee, P Munar, C Mundell, J Mundet, T Murach, H Muraishi, K Murase, A Murphy, A Nagai, N Nagar, S Nagataki, T Nagayoshi, BK Nagesh, T Naito, D Nakajima, T Nakamori, Y Nakamura, K Nakayama, D Naumann, P Nayman, D Neise, L Nellen, R Nemmen, A Neronov, N Neyroud, T Nguyen, TT Nguyen, T Nguyen Trung, L Nicastro, J Nicolau-Kukliński, J Niemiec, D Nieto, M Nievas-Rosillo, M Nikołajuk, K Nishijima, K-I Nishikawa, G Nishiyama, K Noda, L Nogues, S Nolan, D Nosek, M Nöthe, B Novosyadlyj, S Nozaki, F Nunio, P O'Brien, L Oakes, C Ocampo, JP Ochoa, R Oger, Y Ohira, M Ohishi, S Ohm, N Okazaki, A Okumura, J-F Olive, RA Ong, M Orienti, R Orito, A Orlati, JP Osborne, M Ostrowski, N Otte, Z Ou, E Ovcharov, I Oya, A Ozieblo, M Padovani, S Paiano, A Paizis, J Palacio, M Palatiello, M Palatka, J Pallotta, J-L Panazol, D Paneque, M Panter, R Paoletti, M Paolillo, A Papitto, A Paravac, JM Paredes, G Pareschi, RD Parsons, P Paśko, S Pavy, A Pe'er, M Pech, G Pedaletti, P Peñil Del Campo, A Perez, MA Pérez-Torres, L Perri, M Perri, M Persic, A Petrashyk, S Petrera, P-O Petrucci, O Petruk, B Peyaud, M Pfeifer, G Piano, Q Piel, D Pieloth, F Pintore, C Pio García, A Pisarski, S Pita, L Pizarro, Ł Platos, M Pohl, V Poireau, A Pollo, J Porthault, J Poutanen, D Pozo, E Prandini, P Prasit, J Prast, K Pressard, G Principe, D Prokhorov, H Prokoph, M Prouza, G Pruteanu, E Pueschel, G Pühlhofer, I Puljak, M Punch, S Pürckhauer, F Queiroz, J Quinn, A Quirrenbach, I Rafighi, S Rainò, PJ Rajda, R Rando, RC Rannot, S Razzaque, I Reichardt, O Reimer, A Reimer, A Reisenegger, M Renaud, T Reposeur, B Reville, AH Rezaeian, W Rhode, D Ribeiro, M Ribó, MG Richer, T Richtler, J Rico, F Rieger, M Riquelme, PR Ristori, S Rivoire, V Rizi, J Rodriguez, G Rodriguez Fernandez, JJ Rodríguez Vázquez, G Rojas, P Romano, G Romeo, M Roncadelli, J Rosado, S Rosen, S Rosier Lees, J Rousselle, AC Rovero, G Rowell, B Rudak, A Rugliancich, JE Ruíz del Mazo, W Rujopakarn, C Rulten, F Russo, O Saavedra, S Sabatini, B Sacco, I Sadeh, E Sæther Hatlen, S Safi-Harb, V Sahakian, S Sailer, T Saito, N Sakaki, S Sakurai, D Salek, F Salesa Greus, G Salina, D Sanchez, M Sánchez-Conde, H Sandaker, A Sandoval, P Sangiorgi, M Sanguillon, H Sano, M Santander, A Santangelo, EM Santos, A Sanuy, L Sapozhnikov, S Sarkar, K Satalecka, Y Sato, FG Saturni, R Savalle, M Sawada, S Schanne, EJ Schioppa, S Schlenstedt, T Schmidt, J Schmoll, M Schneider, H Schoorlemmer, P Schovanek, A Schulz, F Schussler, U Schwanke, J Schwarz, T Schweizer, S Schwemmer, E Sciacca, S Scuderi, M Seglar-Arroyo, A Segreto, I Seitenzahl, D Semikoz, O Sergijenko, N Serre, M Servillat, K Seweryn, K Shah, A Shalchi, M Sharma, RC Shellard, I Shilon, L Sidoli, M Sidz, H Siejkowski, J Silk, A Sillanpää, D Simone, BB Singh, G Sironi, J Sitarek, P Sizun, V Sliusar, A Slowikowska, A Smith, D Sobczyńska, A Sokolenko, H Sol, G Sottile, W Springer, O Stahl, A Stamerra, S Stanič, R Starling, D Staszak, Ł Stawarz, R Steenkamp, S Stefanik, C Stegmann, S Steiner, C Stella, M Stephan, R Sternberger, M Sterzel, B Stevenson, M Stodulska, M Stodulski, T Stolarczyk, G Stratta, U Straumann, R Stuik, M Suchenek, T Suomijarvi, AD Supanitsky, T Suric, I Sushch, P Sutcliffe, J Sykes, M Szanecki, T Szepieniec, G Tagliaferri, H Tajima, K Takahashi, H Takahashi, M Takahashi, L Takalo, S Takami, J Takata, J Takeda, T Tam, M Tanaka, T Tanaka, Y Tanaka, S Tanaka, C Tanci, M Tavani, F Tavecchio, J-P Tavernet, K Tayabaly, LA Tejedor, F Temme, P Temnikov, Y Terada, JC Terrazas, R Terrier, D Terront, T Terzic, D Tescaro, M Teshima, V Testa, S Thoudam, W Tian, L Tibaldo, A Tiengo, D Tiziani, M Tluczykont, CJ Todero Peixoto, F Tokanai, M Tokarz, K Toma, J Tomastik, A Tonachini, D Tonev, M Tornikoski, DF Torres, E Torresi, G Tosti, T Totani, N Tothill, F Toussenel, G Tovmassian, N Trakarnsirinont, P Travnicek, C Trichard, M Trifoglio, I Troyano Pujadas, M Tsirou, S Tsujimoto, T Tsuru, Y Uchiyama, G Umana, M Uslenghi, V Vagelli, F Vagnetti, M Valentino, P Vallania, L Valore, AM Van den Berg, W van Driel, C van Eldik, B van Soelen, J Vandenbroucke, J Vanderwalt, GS Varner, G Vasileiadis, V Vassiliev, JR Vázquez, M Vázquez Acosta, M Vecchi, A Vega, P Veitch, P Venault, C Venter, S Vercellone, P Veres, S Vergani, V Verzi, GP Vettolani, C Veyssiere, A Viana, J Vicha, C Vigorito, J Villanueva, P Vincent, J Vink, F Visconti, V Vittorini, H Voelk, V Voisin, A Vollhardt, S Vorobiov, I Vovk, M Vrastil, T Vuillaume, SJ Wagner, R Wagner, P Wagner, SP Wakely, T Walstra, R Walter, M Ward, JE Ward, D Warren, JJ Watson, N Webb, P Wegner, O Weiner, A Weinstein, C Weniger, F Werner, H Wetteskind, M White, R White, A Wierzcholska, S Wiesand, R Wijers, P Wilcox, A Wilhelm, M Wilkinson, M Will, DA Williams, M Winter, P Wojcik, D Wolf, M Wood, A Wörnlein, T Wu, KK Yadav, C Yaguna, T Yamamoto, H Yamamoto, N Yamane, R Yamazaki, S Yanagita, L Yang, D Yelos, T Yoshida, M Yoshida, S Yoshiike, T Yoshikoshi, P Yu, D Zaborov, M Zacharias, G Zaharijas, A Zajczyk, L Zampieri, F Zandanel, R Zanin, R Zanmar Sanchez, D Zaric, M Zavrtanik, D Zavrtanik, AA Zdziarski, A Zech, H Zechlin, VI Zhdanov, A Ziegler, J Ziemann, K Ziętara, A Zink, J Ziółkowski, V Zitelli, A Zoli, J Zorn
Details from ArXiV

Search for astrophysical sources of neutrinos using cascade events in IceCube

Astrophysical Journal American Astronomical Society 846:2 (2017) 1-12

Authors:

M Ackermann, J Adams, Subir Sarkar

Abstract:

The IceCube neutrino observatory has established the existence of a flux of high-energy astrophysical neutrinos, which is inconsistent with the expectation from atmospheric backgrounds at a significance greater than 5σ. This flux has been observed in analyses of both track events from muon neutrino interactions and cascade events from interactions of all neutrino flavors. Searches for astrophysical neutrino sources have focused on track events due to the significantly better angular resolution of track reconstructions. To date, no such sources have been confirmed. Here we present the first search for astrophysical neutrino sources using cascades interacting in IceCube with deposited energies as small as 1 TeV. No significant clustering was observed in a selection of 263 cascades collected from 2010 May to 2012 May. We show that compared to the classic approach using tracks, this statistically independent search offers improved sensitivity to sources in the southern sky, especially if the emission is spatially extended or follows a soft energy spectrum. This enhancement is due to the low background from atmospheric neutrinos forming cascade events and the additional veto of atmospheric neutrinos at declinations ≲-30.
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Details from ORA
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Axion driven cosmic magneto-genesis during the QCD crossover

(2017)

Authors:

Francesco Miniati, Gianluca Gregori, Brian Reville, Subir Sarkar
More details from the publisher

All-sky search for correlations in the arrival directions of astrophysical neutrino candidates and ultrahigh-energy cosmic rays

35th International Cosmic Ray Conference (ICRC 2017) Proceedings of Science (2017)

Abstract:

High-energy neutrinos, being neutral and weakly interacting particles, are powerful probes of the sites of production and acceleration of cosmic rays. The challenging discovery of cosmic neutrinos by the IceCube Collaboration has moved the field closer to realizing the potential of neutrino astronomy. Meanwhile, ground-based cosmic ray detectors like the Pierre Auger Observatory and the Telescope Array have reached an unprecedented accuracy in the determination of the features of the cosmic rays at the highest energies. We report on a collaborative effort between IceCube, the Pierre Auger Observatory and Telescope Array to identify directional correlations between the arrival directions of the highest-energy cosmic rays from both hemispheres and of the most probable cosmic neutrino events detected by IceCube. We describe the updated results of two independent searches using seven years of IceCube neutrino data and the most energetic cosmicray events detected by the Pierre Auger Observatory and the Telescope Array. The directional correlation found between UHECRs and neutrinos is reported with a significance of ~ 2σ.
Details from ORA
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Combined Analysis of Cosmic-Ray Anisotropy with IceCube and HAWC

35th International Cosmic Ray Conference 2017(ICRC2017) International School for Advanced Studies (2017)

Abstract:

During the past two decades, experiments in both the northern and southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of Galactic cosmic rays with relative intensities at the level of one per mille. Individually, these measurements are restricted by limited sky coverage, and so the power spectrum of the anisotropy obtained from any one measurement displays a systematic correlation between different multipole modes $C_\ell$. We present the results of a joint analysis of the anisotropy on all angular scales using cosmic-ray data collected during 336 days of operation of the High-Altitude Water Cherenkov (HAWC) Observatory (located at 19$^\circ$ N) and 5 years of data taking from the IceCube Neutrino Observatory (located at 90$^\circ$ S) The results include a combined sky map and an all-sky power spectrum in the overlapping energy range of the two experiments at around 10 TeV. We describe the methods used to combine the IceCube and HAWC data, address the individual detector systematics, and study the region of overlapping field of view between the two observatories.
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