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Evaporating primordial black holes, the string axiverse, and hot dark radiation

(2021)

Authors:

Marco Calzà, John March-Russell, João G Rosa
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Evolving Heterotic Gauge Backgrounds: Genetic Algorithms versus Reinforcement Learning

(2021)

Authors:

Steven Abel, Andrei Constantin, Thomas R Harvey, Andre Lukas
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Three-loop helicity amplitudes for four-quark scattering in massless QCD

Journal of High Energy Physics Scuola Internazionale Superiore di Studi Avanzati 2021:10 (2021) 206

Authors:

Fabrizio Caola, Amlan Chakraborty, Giulio Gambuti, Andreas von Manteuffel, Lorenzo Tancredi

Abstract:

We compute the three-loop corrections to the helicity amplitudes for qq¯¯ → QQ¯¯¯¯ scattering in massless QCD. In the Lorentz decomposition of the scattering amplitude we avoid evanescent Lorentz structures and map the corresponding form factors directly to the physical helicity amplitudes. We reduce the amplitudes to master integrals and express them in terms of harmonic polylogarithms. The renormalised amplitudes exhibit infrared divergences of dipole and quadrupole type, as predicted by previous work on the infrared structure of multileg scattering amplitudes. We derive the finite remainders and present explicit results for all relevant partonic channels, both for equal and different quark flavours.
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Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources

Astrophysical Journal Letters American Astronomical Society 920:2 (2021) L45-L45

Authors:

R Abbasi, M Ackermann, J Adams, Ja Aguilar, M Ahlers, M Ahrens, C Alispach, Aa Alves, Nm Amin, R An, K Andeen, T Anderson, G Anton, C Argüelles, Y Ashida, S Axani, X Bai, Ab V., A Barbano, Sw Barwick, B Bastian, V Basu, S Baur, R Bay, Jj Beatty, Kh Becker, Jb Tjus, C Bellenghi, S Benzvi, D Berley, E Bernardini, Dz Besson, G Binder, D Bindig, E Blaufuss, S Blot, M Boddenberg, F Bontempo, J Borowka, S Böser, O Botner, J Böttcher, E Bourbeau, F Bradascio, J Braun, S Bron, J Brostean-Kaiser, S Browne, A Burgman, Rt Burley

Abstract:

A recent time-integrated analysis of a catalog of 110 candidate neutrino sources revealed a cumulative neutrino excess in the data collected by IceCube between 2008 April 6 and 2018 July 10. This excess, inconsistent with the background hypothesis in the Northern Hemisphere at the 3.3σ level, is associated with four sources: NGC 1068, TXS 0506+056, PKS 1424+240, and GB6 J1542+6129. This Letter presents two time-dependent neutrino emission searches on the same data sample and catalog: a point-source search that looks for the most significant time-dependent source of the catalog by combining space, energy, and time information of the events, and a population test based on binomial statistics that looks for a cumulative time-dependent neutrino excess from a subset of sources. Compared to previous time-dependent searches, these analyses enable a feature to possibly find multiple flares from a single direction with an unbinned maximum-likelihood method. M87 is found to be the most significant time-dependent source of this catalog at the level of 1.7σ post-trial, and TXS 0506+056 is the only source for which two flares are reconstructed. The binomial test reports a cumulative time-dependent neutrino excess in the Northern Hemisphere at the level of 3.0σ associated with four sources: M87, TXS 0506+056, GB6 J1542+6129, and NGC 1068.
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Detection of a particle shower at the Glashow resonance with IceCube

(2021)

Authors:

IceCube Collaboration, MG Aartsen, R Abbasi, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, C Alispach, NM Amin, K Andeen, T Anderson, I Ansseau, G Anton, C Argüelles, J Auffenberg, S Axani, H Bagherpour, X Bai, A Balagopal V., A Barbano, SW Barwick, B Bastian, V Basu, V Baum, S Baur, R Bay, JJ Beatty, K-H Becker, J Becker Tjus, S BenZvi, D Berley, E Bernardini, DZ Besson, G Binder, D Bindig, E Blaufuss, S Blot, C Bohm, S Böser, O Botner, J Böttcher, E Bourbeau, J Bourbeau, F Bradascio, J Braun, S Bron, J Brostean-Kaiser, A Burgman, J Buscher, RS Busse, MA Campana, T Carver, C Chen, E Cheung, D Chirkin, S Choi, BA Clark, K Clark, L Classen, A Coleman, GH Collin, JM Conrad, P Coppin, P Correa, DF Cowen, R Cross, P Dave, C De Clercq, JJ DeLaunay, H Dembinski, K Deoskar, S De Ridder, A Desai, P Desiati, KD de Vries, G de Wasseige, M de With, T DeYoung, S Dharani, A Diaz, JC Díaz-Vélez, H Dujmovic, M Dunkman, MA DuVernois, E Dvorak, T Ehrhardt, P Eller, R Engel, PA Evenson, S Fahey, A Fedynitch, AR Fazely, J Felde, AT Fienberg, K Filimonov, C Finley, L Fischer, D Fox, A Franckowiak, E Friedman, A Fritz, TK Gaisser, J Gallagher, E Ganster, S Garrappa, L Gerhardt, A Ghadimi, T Glauch, T Glüsenkamp, A Goldschmidt, JG Gonzalez, S Goswami, D Grant, T Grégoire, Z Griffith, S Griswold, M Gündüz, C Haack, A Hallgren, R Halliday, L Halve, F Halzen, K Hanson, J Hardin, A Haungs, S Hauser, D Hebecker, D Heereman, P Heix, K Helbing, R Hellauer, F Henningsen, S Hickford, J Hignight, C Hill, GC Hill, KD Hoffman, R Hoffmann, T Hoinka, B Hokanson-Fasig, K Hoshina, F Huang, M Huber, T Huber, K Hultqvist, M Hünnefeld, R Hussain, S In, N Iovine, A Ishihara, M Jansson, GS Japaridze, M Jeong, BJP Jones, F Jonske, R Joppe, D Kang, W Kang, X Kang, A Kappes, D Kappesser, T Karg, M Karl, A Karle, U Katz, M Kauer, M Kellermann, JL Kelley, A Kheirandish, J Kim, K Kin, T Kintscher, J Kiryluk, T Kittler, SR Klein, R Koirala, H Kolanoski, L Köpke, C Kopper, S Kopper, DJ Koskinen, P Koundal, M Kowalski, K Krings, G Krückl, N Kulacz, N Kurahashi, A Kyriacou, C Lagunas Gualda, JL Lanfranchi, MJ Larson, F Lauber, JP Lazar, K Leonard, A Leszczyńska, Y Li, QR Liu, E Lohfink, CJ Lozano Mariscal, L Lu, F Lucarelli, A Ludwig, J Lünemann, W Luszczak, Y Lyu, WY Ma, J Madsen, G Maggi, KBM Mahn, Y Makino, P Mallik, S Mancina, IC Mariş, R Maruyama, K Mase, R Maunu, F McNally, K Meagher, M Medici, A Medina, M Meier, S Meighen-Berger, J Merz, T Meures, J Micallef, D Mockler, G Momenté, T Montaruli, RW Moore, R Morse, M Moulai, P Muth, R Naab, R Nagai, U Naumann, J Necker, G Neer, LV Nguyen, H Niederhausen, MU Nisa, SC Nowicki, DR Nygren, A Obertacke Pollmann, M Oehler, A Olivas, A O'Murchadha, E O'Sullivan, H Pandya, DV Pankova, N Park, GK Parker, EN Paudel, P Peiffer, C Pérez de los Heros, S Philippen, D Pieloth, S Pieper, E Pinat, A Pizzuto, M Plum, Y Popovych, A Porcelli, M Prado Rodriguez, PB Price, GT Przybylski, C Raab, A Raissi, M Rameez, L Rauch, K Rawlins, IC Rea, A Rehman, R Reimann, B Relethford, M Relich, M Renschler, G Renzi, E Resconi, S Reusch, W Rhode, M Richman, B Riedel, S Robertson, G Roellinghoff, M Rongen, C Rott, T Ruhe, D Ryckbosch, D Rysewyk Cantu, I Safa, SE Sanchez Herrera, A Sandrock, J Sandroos, M Santander, S Sarkar, S Sarkar, K Satalecka, M Scharf, M Schaufel, H Schieler, P Schlunder, T Schmidt, A Schneider, J Schneider, FG Schröder, L Schumacher, S Sclafani, D Seckel, S Seunarine, S Shefali, M Silva, B Smithers, R Snihur, J Soedingrekso, D Soldin, M Song, GM Spiczak, C Spiering, J Stachurska, M Stamatikos, T Stanev, R Stein, J Stettner, A Steuer, T Stezelberger, RG Stokstad, NL Strotjohann, T Stürwald, T Stuttard, GW Sullivan, I Taboada, F Tenholt, S Ter-Antonyan, A Terliuk, S Tilav, K Tollefson, L Tomankova, C Tönnis, S Toscano, D Tosi, A Trettin, M Tselengidou, CF Tung, A Turcati, R Turcotte, CF Turley, JP Twagirayezu, B Ty, E Unger, MA Unland Elorrieta, J Vandenbroucke, D van Eijk, N van Eijndhoven, D Vannerom, J van Santen, S Verpoest, M Vraeghe, C Walck, A Wallace, N Wandkowsky, TB Watson, C Weaver, A Weindl, MJ Weiss, J Weldert, C Wendt, J Werthebach, BJ Whelan, N Whitehorn, K Wiebe, CH Wiebusch, DR Williams, L Wills, M Wolf, TR Wood, K Woschnagg, G Wrede, J Wulff, XW Xu, Y Xu, JP Yanez, S Yoshida, T Yuan, Z Zhang, M Zöcklein
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