Footprints of Loop I on cosmic microwave background maps

Journal of Cosmology and Astroparticle Physics IOP Publishing 2016:3 (2016) 023

Authors:

Sv Hausegger, H Liu, P Mertsch, Subir Sarkar

Abstract:

Cosmology has made enormous progress through studies of the cosmic microwave background, however the subtle signals being now sought such as B-mode polarisation due to primordial gravitational waves are increasingly hard to disentangle from residual Galactic foregrounds in the derived CMB maps. We revisit our finding that on large angular scales there are traces of the nearby old supernova remnant Loop I in the WMAP 9-year map of the CMB and confirm this with the new SMICA map from the Planck satellite.

Search for new phenomena in dijet mass and angular distributions from pp collisions at root s=13 TeV with the ATLAS detector

Physics Letters B Elsevier 754 (2016) 302-322

Authors:

G Artoni, AJ Barr, K Becker, JK Behr, L Beresford, D Bortoletto, AM Cooper-Sarkar, M Crispin Ortuzar, JA Frost, EJ Gallas, S Gupta, C Gwenlan, D Hall, CP Hays, J Henderson, J Howard, TB Huffman, C Issever, CW Kalderon, LA Kogan, K Nagai, RB Nickerson, MA Pickering, NC Ryder, JCL Tseng, GHA Viehhauser, AR Weidberg, Z J, M Crispin Ortuzar

Abstract:

This Letter describes a model-agnostic search for pairs of jets (dijets) produced by resonant and non-resonant phenomena beyond the Standard Model in 3.6 fb-1 of proton-proton collisions with a centre-of-mass energy of s=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the smoothly falling prediction of the Standard Model. The data are also compared to a Monte Carlo simulation of Standard Model angular distributions derived from the rapidity of the two jets. No evidence of anomalous phenomena is observed in the data, which are used to exclude, at 95% CL, quantum black holes with threshold masses below 8.3 TeV, 8.1 TeV, or 5.1 TeV in three different benchmark scenarios; resonance masses below 5.2 TeV for excited quarks, 2.6 TeV in a W' model, a range of masses starting from mZ'=1.5 TeV and couplings from gq=0.2 in a Z' model; and contact interactions with a compositeness scale below 12.0 TeV and 17.5 TeV respectively for destructive and constructive interference between the new interaction and QCD processes. These results significantly extend the ATLAS limits obtained from 8 TeV data. Gaussian-shaped contributions to the mass distribution are also excluded if the effective cross-section exceeds values ranging from approximately 50-300 fb for masses below 2 TeV to 2-20 fb for masses above 4 TeV.

Searches for relativistic magnetic monopoles in IceCube

European Physical Journal C (2016)

Authors:

MG Aartsen, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, I Ansseau, M Archinger, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, K-H Becker, E Beiser, ML Benabderrahmane, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, M Börner, F Bos, D Bose, S Böser, O Botner, J Braun, L Brayeur, H-P Bretz, N Buzinsky, J Casey, M Casier, E Cheung, D Chirkin, A Christov, K Clark

Abstract:

© 2016, The Author(s).Various extensions of the Standard Model motivate the existence of stable magnetic monopoles that could have been created during an early high-energy epoch of the Universe. These primordial magnetic monopoles would be gradually accelerated by cosmic magnetic fields and could reach high velocities that make them visible in Cherenkov detectors such as IceCube. Equivalently to electrically charged particles, magnetic monopoles produce direct and indirect Cherenkov light while traversing through matter at relativistic velocities. This paper describes searches for relativistic ((Formula presented.)) and mildly relativistic ((Formula presented.)) monopoles, each using one year of data taken in 2008/2009 and 2011/2012, respectively. No monopole candidate was detected. For a velocity above (Formula presented.) the monopole flux is constrained down to a level of (Formula presented.). This is an improvement of almost two orders of magnitude over previous limits.

Search for strong gravity in multijet final states produced in pp collisions at s=13 TeV using the ATLAS detector at the LHC

Journal of High Energy Physics Springer Nature 2016:3 (2016) 26

Authors:

The ATLAS collaboration, G Aad, B Abbott, J Abdallah, O Abdinov, B Abeloos, 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, J Agricola, JA Aguilar-Saavedra, SP Ahlen, F Ahmadov, G Aielli, H Akerstedt, TPA Åkesson, 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, BW Allen, PP Allport, A Aloisio, A Alonso, F Alonso, C Alpigiani, 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, LJ Armitage, O Arnaez, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Artz, S Asai, N Asbah, A Ashkenazi, B Åsman, 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, Sw Banerjee, AAE Bannoura, 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, L Barranco Navarro, 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, 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, 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, J Benitez, 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, 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, D Biedermann, R Bielski, NV Biesuz, M Biglietti, J Bilbao De Mendizabal, 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 Bobrovnikov, SS Bocchetta, A Bocci, C Bock, M Boehler, D Boerner, JA Bogaerts, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, T Bold, V Boldea, AS Boldyrev, 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, N Bousson, SK Boutle, A Boveia, J Boyd, IR Boyko, J Bracinik, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, WD Breaden 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, PA Bruckman de Renstrom, D Bruncko, R Bruneliere, A Bruni, G 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 Burghgrave, K Burka, S Burke, I Burmeister, E Busato, D Büscher, V Büscher, P Bussey, JM Butler, AI Butt, CM Buttar, JM Butterworth, P Butti, W Buttinger, A Buzatu, AR Buzykaev, S Cabrera Urbán, D Caforio, VM Cairo, O Cakir, N Calace, P Calafiura, A Calandri, G Calderini, P Calfayan, LP Caloba, D Calvet, S Calvet, TP Calvet, R Camacho Toro, S Camarda, P Camarri, D Cameron, R Caminal Armadans, C Camincher, S Campana, M Campanelli, A Campoverde, V Canale, A Canepa, M Cano Bret, J Cantero, R Cantrill, T Cao, MDM Capeans Garrido, I Caprini, M Caprini, M Capua, R Caputo, RM Carbone, R Cardarelli, F Cardillo, T Carli, G Carlino, L Carminati, S Caron, E Carquin, GD Carrillo-Montoya, JR Carter, J Carvalho, D Casadei, MP Casado, M Casolino, DW Casper, E Castaneda-Miranda, A Castelli, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, A Cattai, J Caudron, V Cavaliere, D Cavalli, M Cavalli-Sforza, V Cavasinni, F Ceradini, L Cerda Alberich, BC Cerio, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, M Cerv, A Cervelli, SA Cetin, A Chafaq, D Chakraborty, I Chalupkova, YL Chan, P Chang, JD Chapman, DG Charlton, CC Chau, CA Chavez Barajas, S Che, S Cheatham, A Chegwidden, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, H Chen, K Chen, S Chen, S Chen, X Chen, Y Chen, HC Cheng, Y Cheng, A Cheplakov, E Cheremushkina, R Cherkaoui El Moursli, V Chernyatin, E Cheu, L Chevalier, V Chiarella, G Chiarelli, G Chiodini, AS Chisholm, RT Chislett, A Chitan, MV Chizhov, K Choi, S Chouridou, BKB Chow, V Christodoulou, D Chromek-Burckhart, J Chudoba, AJ Chuinard, JJ Chwastowski, L Chytka, G Ciapetti, AK Ciftci, D Cinca, V Cindro, IA Cioara, A Ciocio, F Cirotto, ZH Citron, M Ciubancan, A Clark, BL Clark, PJ Clark, RN Clarke, C Clement, Y Coadou, M Cobal, A Coccaro, J Cochran, L Coffey, L Colasurdo, B Cole, S Cole, AP Colijn, J Collot, T Colombo, G Compostella, P Conde Muiño, E Coniavitis, SH Connell, IA Connelly, V Consorti, S Constantinescu, C Conta, G Conti, F Conventi, M Cooke, BD Cooper, AM Cooper-Sarkar, T Cornelissen, M Corradi, F Corriveau, A Corso-Radu, A Cortes-Gonzalez, G Cortiana, G Costa, MJ Costa, D Costanzo, G Cottin, G Cowan, BE Cox, K Cranmer, SJ Crawley, G Cree, S Crépé-Renaudin, F Crescioli, WA Cribbs, M Crispin Ortuzar, M Cristinziani, V Croft, G Crosetti, T Cuhadar Donszelmann, J Cummings, M Curatolo, J Cúth, C Cuthbert, H Czirr, P Czodrowski, S D’Auria, M D’Onofrio, MJ Da Cunha Sargedas De Sousa, C Da Via, W Dabrowski, T Dai, O Dale, F Dallaire, C Dallapiccola, M Dam, JR Dandoy, NP Dang, AC Daniells, M Danninger, M Dano Hoffmann, V Dao, G Darbo, S Darmora, J Dassoulas, A Dattagupta, W Davey, C David, T Davidek, M Davies, P Davison, Y Davygora, E Dawe, I Dawson, RK Daya-Ishmukhametova, K De, R de Asmundis, A De Benedetti, S De Castro, S De Cecco, N De Groot, P de Jong, H De la Torre, F De Lorenzi, D De Pedis, A De Salvo, U De Sanctis, A De Santo, JB De Vivie De Regie, WJ Dearnaley, R Debbe, C Debenedetti, DV Dedovich, I Deigaard, J Del Peso, T Del Prete, D Delgove, F Deliot, CM Delitzsch, M Deliyergiyev, A Dell’Acqua, L Dell’Asta, M Dell’Orso, M Della Pietra, D della Volpe, M Delmastro, PA Delsart, C Deluca, DA DeMarco, S Demers, M Demichev, A Demilly, SP Denisov, D Denysiuk, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, C Deterre, K Dette, PO Deviveiros, A Dewhurst, S Dhaliwal, A Di Ciaccio, L Di Ciaccio, WK Di Clemente, A Di Domenico, C Di Donato, A Di Girolamo, B Di Girolamo, A Di Mattia, B Di Micco, R Di Nardo, A Di Simone, R Di Sipio, D Di Valentino, C Diaconu, M Diamond, FA Dias, MA Diaz, J Dickinson, EB Diehl, J Dietrich, S Diglio, A Dimitrievska, J Dingfelder, P Dita, S Dita, F Dittus, F Djama, T Djobava, JI Djuvsland, MAB do Vale, D Dobos, M Dobre, C Doglioni, T Dohmae, J Dolejsi, Z Dolezal, BA Dolgoshein, M Donadelli, S Donati, P Dondero, J Donini, J Dopke, A Doria, MT Dova, AT Doyle, E Drechsler, M Dris, Y Du, J Duarte-Campderros, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, L Duflot, L Duguid, M Dührssen, M Dunford, H Duran Yildiz, M Düren, A Durglishvili, D Duschinger, B Dutta, M Dyndal, C Eckardt, KM Ecker, RC Edgar, W Edson, NC Edwards, T Eifert, G Eigen, K Einsweiler, T Ekelof, M El Kacimi, V Ellajosyula, M Ellert, S Elles, F Ellinghaus, AA Elliot, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, Y Enari, OC Endner, M Endo, JS Ennis, J Erdmann, A Ereditato, G Ernis, J Ernst, M Ernst, S Errede, E Ertel, M Escalier, H Esch, C Escobar, B Esposito, AI Etienvre, E Etzion, H Evans, A Ezhilov, L Fabbri, G Facini, RM Fakhrutdinov, S Falciano, RJ Falla, J Faltova, Y Fang, M Fanti, A Farbin, A Farilla, C Farina, T Farooque, S Farrell, SM Farrington, P Farthouat, F Fassi, P Fassnacht, D Fassouliotis, M Faucci Giannelli, A Favareto, L Fayard, OL Fedin, W Fedorko, S Feigl, L Feligioni, C Feng, EJ Feng, H Feng, AB Fenyuk, L Feremenga, P Fernandez Martinez, S Fernandez Perez, J Ferrando, A Ferrari, P Ferrari, R Ferrari, DE Ferreira de Lima, A Ferrer, D Ferrere, C Ferretti, A Ferretto Parodi, F Fiedler, A Filipčič, M Filipuzzi, F Filthaut, M Fincke-Keeler, KD Finelli, MCN Fiolhais, L Fiorini, A Firan, A Fischer, C Fischer, J Fischer, WC Fisher, N Flaschel, I Fleck, P Fleischmann, GT Fletcher, G Fletcher, RRM Fletcher, T Flick, A Floderus, LR Flores Castillo, MJ Flowerdew, GT Forcolin, A Formica, A Forti, D Fournier, H Fox, S Fracchia, P Francavilla, M Franchini, D Francis, L Franconi, M Franklin, M Frate, M Fraternali, D Freeborn, SM Fressard-Batraneanu, F Friedrich, D Froidevaux, JA Frost, C Fukunaga, E Fullana Torregrosa, T Fusayasu, J Fuster, C Gabaldon, O Gabizon, A Gabrielli, A Gabrielli, GP Gach, S Gadatsch, S Gadomski, G Gagliardi, P Gagnon, C Galea, B Galhardo, EJ Gallas, BJ Gallop, P Gallus, G Galster, KK Gan, J Gao, Y Gao, YS Gao, FM Garay Walls, C García, JE García Navarro, M Garcia-Sciveres, RW Gardner, N Garelli, V Garonne, A Gascon Bravo, C Gatti, A Gaudiello, G Gaudio, B Gaur, L Gauthier, IL Gavrilenko, C Gay, G Gaycken, EN Gazis, Z Gecse, CNP Gee, Ch Geich-Gimbel, MP Geisler, C Gemme, MH Genest, C Geng, S Gentile, S George, D Gerbaudo, A Gershon, S Ghasemi, H Ghazlane, B Giacobbe, S Giagu, P Giannetti, B Gibbard, SM Gibson, M Gignac, M Gilchriese, TPS Gillam, D Gillberg, G Gilles, DM Gingrich, N Giokaris, MP Giordani, FM Giorgi, FM Giorgi, PF Giraud, P Giromini, D Giugni, C Giuliani, M Giulini, BK Gjelsten, S Gkaitatzis, I Gkialas, EL Gkougkousis, LK Gladilin, C Glasman, J Glatzer, PCF Glaysher, A Glazov, M Goblirsch-Kolb, J Godlewski, S Goldfarb, T Golling, D Golubkov, A Gomes, R Gonçalo, J Goncalves Pinto Firmino Da Costa, L Gonella, A Gongadze, S González de la Hoz, G Gonzalez Parra, S Gonzalez-Sevilla, L Goossens, PA Gorbounov, HA Gordon, I Gorelov, B Gorini, E Gorini, A Gorišek, E Gornicki, AT Goshaw, C Gössling, MI Gostkin, CR Goudet, D Goujdami, AG Goussiou, N Govender, E Gozani, L Graber, I Grabowska-Bold, POJ Gradin, P Grafström, J Gramling, E Gramstad, S Grancagnolo, V Gratchev, HM Gray, E Graziani, ZD Greenwood, C Grefe, K Gregersen, IM Gregor, P Grenier, K Grevtsov, J Griffiths, AA Grillo, K Grimm, S Grinstein, Ph Gris, J-F Grivaz, S Groh, JP Grohs, E Gross, J Grosse-Knetter, GC Grossi, ZJ Grout, L Guan, J Guenther, F Guescini, D Guest, O Gueta, E Guido, T Guillemin, S Guindon, U Gul, C Gumpert, J Guo, Y Guo, S Gupta, G Gustavino, P Gutierrez, NG Gutierrez Ortiz, C Gutschow, C Guyot, C Gwenlan, CB Gwilliam, A Haas, C Haber, HK Hadavand, N Haddad, A Hadef, P Haefner, S Hageböck, Z Hajduk, H Hakobyan, M Haleem, J Haley, D Hall, G Halladjian, GD Hallewell, K Hamacher, P Hamal, K Hamano, A Hamilton, GN Hamity, PG Hamnett, L Han, K Hanagaki, K Hanawa, M Hance, B Haney, P Hanke, R Hanna, JB Hansen, JD Hansen, MC Hansen, PH Hansen, K Hara, AS Hard, T Harenberg, F Hariri, S Harkusha, RD Harrington, PF Harrison, F Hartjes, M Hasegawa, Y Hasegawa, A Hasib, S Hassani, S Haug, R Hauser, L Hauswald, M Havranek, CM Hawkes, RJ Hawkings, AD Hawkins, T Hayashi, D Hayden, CP Hays, JM Hays, HS Hayward, SJ Haywood, SJ Head, T Heck, V Hedberg, L Heelan, S Heim, T Heim, B Heinemann, JJ Heinrich, L Heinrich, C Heinz, J Hejbal, L Helary, S Hellman, C Helsens, J Henderson, RCW Henderson, Y Heng, S Henkelmann, AM Henriques Correia, S Henrot-Versille, GH Herbert, Y Hernández Jiménez, G Herten, R Hertenberger, L Hervas, GG Hesketh, NP Hessey, JW Hetherly, R Hickling, E Higón-Rodriguez, E Hill, JC Hill, KH Hiller, SJ Hillier, I Hinchliffe, E Hines, RR Hinman, M Hirose, D Hirschbuehl, J Hobbs, N Hod, MC Hodgkinson, P Hodgson, A Hoecker, MR Hoeferkamp, F Hoenig, M Hohlfeld, D Hohn, TR Holmes, M Homann, TM Hong, BH Hooberman, WH Hopkins, Y Horii, AJ Horton, J-Y Hostachy, S Hou, A Hoummada, J Howard, J Howarth, M Hrabovsky, I Hristova, J Hrivnac, T Hryn’ova, A Hrynevich, C Hsu, PJ Hsu, S-C Hsu, D Hu, Q Hu, Y Huang, Z Hubacek, F Hubaut, F Huegging, TB Huffman, EW Hughes, G Hughes, M Huhtinen, TA Hülsing, N Huseynov, J Huston, J Huth, G Iacobucci, G Iakovidis, I Ibragimov, L Iconomidou-Fayard, E Ideal, Z Idrissi, P Iengo, O Igonkina, T Iizawa, Y Ikegami, M Ikeno, Y Ilchenko, D Iliadis, N Ilic, T Ince, G Introzzi, P Ioannou, M Iodice, K Iordanidou, V Ippolito, A Irles Quiles, C Isaksson, M Ishino, M Ishitsuka, R Ishmukhametov, C Issever, S Istin, JM Iturbe Ponce, R Iuppa, J Ivarsson, W Iwanski, H Iwasaki, JM Izen, V Izzo, S Jabbar, B Jackson, M Jackson, P Jackson, V Jain, KB Jakobi, K Jakobs, S Jakobsen, T Jakoubek, DO Jamin, DK Jana, E Jansen, R Jansky, J Janssen, M Janus, G Jarlskog, N Javadov, T Javůrek, F Jeanneau, L Jeanty, J Jejelava, G-Y Jeng, D Jennens, P Jenni, J Jentzsch, C Jeske, S Jézéquel, H Ji, J Jia, H Jiang, Y Jiang, S Jiggins, J Jimenez Pena, S Jin, A Jinaru, O Jinnouchi, P Johansson, KA Johns, WJ Johnson, K Jon-And, G Jones, RWL Jones, S Jones, TJ Jones, J Jongmanns, PM Jorge, J Jovicevic, X Ju, A Juste Rozas, MK Köhler, M Kaci, A Kaczmarska, M Kado, H Kagan, M 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The prompt atmospheric neutrino flux in the light of LHCb

JHEP Springer Berlin Heidelberg 02:2 (2016) 130

Authors:

R Gauld, J Rojo, L Rottoli, Subir Sarkar, J Talbert

Abstract:

The recent observation of very high energy cosmic neutrinos by IceCube heralds the beginning of neutrino astronomy. At these energies, the dominant background to the astrophysical signal is the flux of `prompt' neutrinos, arising from the decay of charmed mesons produced by cosmic ray collisions in the atmosphere. In this work we provide predictions for the prompt atmospheric neutrino flux in the framework of perturbative QCD, using state-of-the-art Monte Carlo event generators. Our calculation includes the constraints set by charm production measurements from the LHCb experiment at 7 TeV, and has been recently validated with the corresponding 13 TeV data. Our results for the prompt flux are a factor of about 2 below the previous benchmark calculation, in general agreement with two other recent estimates, and with an improved estimate of the uncertainty. This alleviates the existing tension between the theoretical prediction and IceCube limits, and suggests that a direct direction of the prompt flux is imminent.