42 results on '"Siqueira, Clarissa"'
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2. Chasing Gravitational Waves with the Cherenkov Telescope Array
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Green, Jarred Gershon, Carosi, Alessandro, Nava, Lara, Patricelli, Barbara, Schüssler, Fabian, Seglar-Arroyo, Monica, Consortium, Cta, Abe, Kazuki, Abe, Shotaro, Acharyya, Atreya, Adam, Remi, Aguasca-Cabot, Arnau, Agudo, Ivan, Alfaro, Jorge, Alvarez-Crespo, Nuria, Batista, Rafael Alves, Amans, Jean-Philippe, Amato, Elena, Ambrosino, Filippo, Angüner, Ekrem Oguzhan, Antonelli, Lucio Angelo, Aramo, Carla, Arcaro, Cornelia, Arrabito, Luisa, Asano, Katsuaki, Aschersleben, Jann, Ashkar, Halim, Stuani, Luiz Augusto, Baack, Dominik, Backes, Michael, Balazs, Csaba, Balbo, Matteo, Larriva, Andres Baquero, Martins, Victor Barbosa, de Almeida, Ulisses Barres, Barrio, Juan Abel, Bastieri, Denis, Batista, Pedro Ivo, Batković, Ivana, Batzofin, Rowan William, Baxter, Joshua Ryo, Beck, Geoffrey, Tjus, Julia Becker, Beiske, Lukas, Belardinelli, Daniele, Benbow, Wystan, Bernardini, Elisa, Medrano, Juan Bernete, Bernlöhr, Konrad, Berti, Alessio, Beshley, Vasyl, Bhattacharjee, Pooja, Bhattacharyya, Saptashwa, Bi, Baiyang, Biederbeck, Noah, Biland, Adrian, Bissaldi, Elisabetta, Blanch, Oscar, Blazek, Jiri, Boisson, Catherine, Bolmont, Julien, Bonnoli, Giacomo, Bordas, Pol, Bošnjak, Željka, Bradascio, Federica, Braiding, Catherine, Bronzini, Ettore, Brose, Robert, Brown, Anthony M., Brun, Francois, Brunelli, Giulia, Bulgarelli, Andrea, Burelli, Irene, Burmistrov, Leonid, Burton, Michael, Bylund, Tomas, Calisse, Paolo Gherardo, Campoy-Ordaz, Anna, Cantlay, Brandon Khan, Capalbi, Milvia, Caproni, Anderson, Capuzzo-Dolcetta, Roberto, Carlile, Colin, Caroff, Sami, Carosi, Roberto, Carrasco, Marie-Sophie, Cascone, Enrico, Cassol, Franca, Castrejon, Noelia, Catalani, Fernando, Cerasole, Davide, Cerruti, Matteo, Chaty, Sylvain, Chen, Andrew W, Chernyakova, Maria, Chiavassa, Andrea, Chudoba, Jiří, Araujo, Carlos Henrique Coimbra, Conforti, Vito, Conte, Francesco, Contreras, Jose Luis, Cossou, Christophe, Costa, Alessandro, Costantini, Heide, Cristofari, Pierre, Cuevas, Omar, Curtis-Ginsberg, Zachary, D'Amico, Giacomo, D'Ammando, Filippo, Dadina, Mauro, Dalchenko, Mykhailo, David, Ludovic, Davids, Isak Delberth, Dazzi, Francesco, De Angelis, Alessandro, de Lavergne, Mathieu de Bony, De Caprio, Vincenzo, De Cesare, Giovanni, Pino, Elisabete M. de Gouveia Dal, De Lotto, Barbara, de Lucia, Mario, de Menezes, Raniere, de Naurois, Mathieu, Wilhelmi, Emma de Oña, De Simone, Nicola, de Souza, Vitor, Del Peral, Luis, del Valle, Maria Victoria, Delagnes, Eric, Giler, Andres Gabriel Delgado, Delgado, Carlos, Dell'aiera, Michael, Della Ceca, Roberto, Della Valle, Massimo, Della Volpe, Domenico, Depaoli, Davide, Dettlaff, Antonios, Di Girolamo, Tristano, Di Piano, Ambra, Di Pierro, Federico, Di Tria, Riccardo, Di Venere, Leonardo, Díaz-Bahamondes, Christian, Dib, Claudio, Diebold, Sebastian, Dima, Razvan, Dinesh, Adithiya, Djannati-Ataï, Arache, Djuvsland, Julia Isabel, Dominguez, Alberto, Dominik, Rune Michael, Donini, Alice, Dorner, Daniela, Dörner, Julien, Doro, Michele, Anjos, Rita de Cassia dos, Dournaux, Jean-Laurent, Dravins, Dainis, Duangchan, Chaimongkol, Dubos, Coline, Ducci, Lozenzo, Dwarkadas, Vikram V., Ebr, Jan, Eckner, Christopher, Egberts, Kathrin, Einecke, Sabrina, Elsässer, Dominik, Emery, Gabriel, Godoy, Miguel Escobar, Escudero, Juan, Esposito, Paolo, Falceta-Gonçalves, Diego, Ramazani, Vandad Fallah, Faure, Alice, Fedorova, Elena, Fegan, Stephen, Feijen, Kirsty, Feng, Qi, Ferrand, Gilles, Ferrarotto, Fabio, Fiandrini, Emanuele, Fiasson, Armand, Fioretti, Valentina, Foffano, Luca, Guiteras, Lluis Font, Fontaine, Gerard, Fröse, Stefan, Fukami, Satoshi, Fukui, Yasuo, Funk, Stefan, Gaggero, Daniele, Galanti, Giorgio, Galaz, Gaspar, Gallant, Yves A., Gallozzi, Stefano, Gammaldi, Viviana, Gasbarra, Claudio, Gaug, Markus, Ghalumyan, Arsen, Gianotti, Fulvio, Giarrusso, Marina, Giglietto, Nicola, Giordano, Francesco, Giuliani, Andrea, Glicenstein, Jean-Francois, Glombitza, Jonas, Goldoni, Paolo, González, José Mauricio, González, Maria Magdalena, Coelho, Jaziel Goulart, Granot, Jonathan, Grasso, Dario, Haro, Roger Grau, Green, David, Greenshaw, Tim, Grolleron, Guillaume, Grube, Jeff, Gueta, Orel, Gunji, Shuichi, Hadasch, Daniela, Hamal, Petr, Hanlon, William, Hara, Satoshi, Harvey, Violet M., Hashiyama, Kazuaki, Hassan, Tarek, Heller, Matthieu, Cadena, Sergio Hernández, Hie, Jonathan, Hiroshima, Nagisa, Hnatyk, Bohdan, Hnatyk, Roman, Hoffmann, Dirk, Hofmann, Werner, Holler, Markus, Horan, Deirdre, Horvath, Pavel, Hovatta, Talvikki, Hrupec, Dario, Hussain, Saqib, Iarlori, Marco, Inada, Tomohiro, Incardona, Federico, Inome, Yusuke, Inoue, Susumu, Iocco, Fabio, Ishio, Kazuma, Jamrozy, Marek, Janecek, Petr, Jankowsky, Felix, Jarnot, Christian, Jean, Pierre, Martínez, Irene Jiménez, Jin, Weidong, Jocou, Laurent, Juramy-Gilles, Claire, Jurysek, Jakub, KALEKIN, Oleg, Kantzas, Dimitrios, Karas, Vladimir, Kaufmann, Sarah, Kerszberg, Daniel, Khelifi, Bruno, Kieda, David B, Kleiner, Tobias Kai, Kluźniak, Włodzimierz, Kobayashi, Yukiho, Kohri, Kazunori, Komin, Nukri, Kornecki, Paula, Kosack, Karl, Kubo, Hidetoshi, Kushida, Junko, La Barbera, Antonino, La Palombara, Nicola, Lainez, Maria, Lamastra, Alessandra, Lapington, Jon S, Lazarevic, Sanja, Lazendic-Galloway, Jasmina, Leach, Steven, Lemoine-Goumard, Marianne, Lenain, Jean-Philippe, Leto, Giuseppe, Leuschner, Fabian, Lindfors, Elina, Linhoff, Maximilian, Liodakis, Ioannis, Loïc, Lozach, Lombardi, Saverio, Longo, Francesco, López-Coto, Rubén, López-Moya, Marcos, López-Oramas, Alicia, Loporchio, Serena, Bahilo, Julio Lozano, Luque-Escamilla, Pedro L., Macias, Oscar, Maier, Gernot, Majumdar, Pratik, Malyshev, Denys, Malyshev, Dmitry, Mandat, Dusan, Manicò, Giulio, Marinos, Peter David, Markoff, Sera, Márquez, Isabel, Marquez, Patricia, Marsella, Giovanni, Martí, Josep, Martin, Pierrick, Martínez, Gustavo Augusto, Martínez, Manel, Martinez, Oibar, Marty, Christophe, Mas-Aguilar, Alvaro, Mastropietro, Michele, Maurin, Gilles, Max-Moerbeck, Walter, Mazin, Daniel, Melkumyan, David, Menchiari, Stefano, Mestre, Enrique, Meunier, Jean-Luc, Meyer, Dominique M. -A., Miceli, Davide, Michailidis, Miltiadis, Michałowski, Jerzy, Miener, Tjark, Miranda, Jose Miguel, Mitchell, Alison, Mizote, Masaya, Mizuno, Tsunefumi, Moderski, Rafal, Mohrmann, Lars, Molero, Miguel, Molfese, Cesare, Molina, Edgar, Montaruli, Teresa, Moralejo, Abelardo, Morcuende, Daniel, Morik, Katharina, Morselli, Aldo, Moulin, Emmanuel, Zamanillo, Victor Moya, Mukherjee, Reshmi, Munari, Kevin, Muraczewski, Adam, Muraishi, Hiroshi, Nakamori, Takeshi, Nayak, Amrit, Nemmen, Rodrigo, Nickel, Lukas, Niemiec, Jacek, Nieto, Daniel, Rosillo, Mireia Nievas, Nikołajuk, Marek, Nishijima, Kyoshi, Noda, Koji, Nosek, Dalibor, Novosyadlyj, Bohdan, Novotný, Vladimír, Nozaki, Seiya, O'Brien, Paul, Ohishi, Michiko, Ohtani, Yoshiki, Okumura, Akira, Olive, Jean-François, Olmi, Barbara, Ong, Rene A., Orienti, Monica, Orito, Reiko, Orlandini, Mauro, Orlando, Elena, Ostrowski, Michal, Otte, Nepomuk, Oya, Igor, Pagano, Isabella, Pagliaro, Antonio, Palatiello, Michele, Panebianco, Gabriele, Paredes, Josep M., Parmiggiani, Nicolò, Patel, Sonal Ramesh, Pavlović, Dijana, Pe'er, Asaf, Pech, Miroslav, Pecimotika, Mario, Peresano, Michele, Pérez-Romero, Judit, Peron, Giada, Persic, Massimo, Petrucci, Pierre-Olivier, Petruk, Oleh, Pfeifle, Felix, Pintore, Fabio, Pirola, Giorgio, Pittori, Carlotta, Plard, Cyann, Podobnik, Franjo, Pohl, Martin, Pons, Estelle, Prandini, Elisa, Prast, Julie, Principe, Giacomo, Priyadarshi, Chaitanya, Produit, Nicolas, Prokhorov, Dmitry, Pueschel, Elisa, Pühlhofer, Gerd, Pumo, Maria Letizia, Punch, Michael, Quirrenbach, Andreas, Raino, Silvia, Randazzo, Nunzio, Rando, Riccardo, Ravel, Thierry, Razzaque, Soebur, Regeard, Maxime, Reichherzer, Patrick, Reimer, Anita, Reimer, Olaf, Reisenegger, Andreas, Reposeur, Thierry, Reville, Brian, Rhode, Wolfgang, Ribó, Marc, Richtler, Tom, Rieger, Frank, Roache, Emmet, Fernandez, Gonzalo Rodriguez, Frías, Maria Dolores Rodríguez, Rodríguez-Vázquez, Juan José, Romano, Patrizia, Romeo, Giuseppe, Rosado, Jaime, Rowell, Gavin P, Rudak, Bronislaw, Ruiter, Ashley J., Rulten, Cameron Boyd, Russo, Federico, Sadeh, Iftach, Saha, Lab, Saito, Takayuki, Sakurai, Shunsuke, Salzmann, Heiko, Sanchez, David, Sanchez-Conde, Miguel, Sangiorgi, Pierluca, Sano, Hidetoshi, Santander, Marcos, Santangelo, Andrea, Santos-Lima, Reinaldo, Sanuy, Andreu, Šarić, Toni, Sarkar, Arkadipta, Sarkar, Subir, Saturni, Francesco Gabriele, Savchenko, Volodymyr, Scherer, Andres, Schipani, Pietro, Schleicher, Bernd, Schovanek, Petr, Schubert, Jan Lukas, Schwanke, Ullrich, Schwefer, Georg, Scuderi, Salvatore, Arroyo, Monica Seglar, Seitenzahl, Ivo, Sergijenko, Olga, Sguera, Vito, Shang, Ruo-Yu, Sharma, Pooja, Sidibe, Guereguin Der Sylvestre, Sidoli, Lara, Siejkowski, Hubert, Siqueira, Clarissa, Sizun, Patrick, Sliusar, Vitalii, Slowikowska, Agnieszka, Sol, Helene, Specovius, Andreas, Spencer, Samuel Timothy, Spiga, Daniele, Stamerra, Antonio, Stanič, Samo, Starecki, Tomasz, Starling, Rhaana, Steppa, Constantin, Stolarczyk, Thierry, Strišković, Jelena, Strzys, Marcel C., Suda, Yusuke, Suomijarvi, Tiina, Tak, Donggeun, Takahashi, Mitsunari, Takeishi, Ryuji, Tam, Pak-Hin Thomas, Tanaka, Shuta J, Tanaka, Takaaki, Terauchi, Kenta, Testa, Vincenzo, Tibaldo, Luigi, Tibolla, Omar, Torradeflot, Francesc, Torres, Diego F., Torresi, Eleonora, Tothill, Nick, Toussenel, Francois, Touzard, Victoria, Tramacere, Andrea, Travnicek, Petr, Tripodo, Giovanni, Truzzi, Stefano, Tsiahina, Adellain, Tutone, Antonio, Vacula, Martin, Vallage, Bertrand, Vallania, Piero, Vallés, Ramon, van Eldik, Christopher, van Scherpenberg, Juliane, Vandenbroucke, Justin, Vassiliev, Vladimir, Venault, Philippe, Ventura, Sofia, Vercellone, Stefano, Verna, Gaia, Viana, Aion, Viaux, Nicolás, Vigliano, Alessandro, Vignatti, Jonatan, Vigorito, Carlo francesco, Vitale, Vincenzo, Vodeb, Veronika, Voisin, Vincent, Vorobiov, Serguei, Voutsinas, Georgios Gerasimos, Vovk, Ievgen, Waegebaert, Vincent, Wagner, Stefan Joachim, Walter, Roland, Ward, Martin, Wechakama, Maneenate, White, Richard, Wierzcholska, Alicja, Will, Martin, Williams, David A., Wohlleben, Frederik, Wolter, Anna, Yamamoto, Tokonatsu, Yamazaki, Ryo, Yang, Lili, Yoshida, Tatsuo, Yoshikoshi, Takanori, Zacharias, Michael, Sanchez, Ricardo Zanmar, Zavrtanik, Danilo, Zavrtanik, Marko, Zdziarski, Andrzej A., Zech, Andreas, Zhdanov, Valery I., Ziȩtara, Krzysztof, Živec, Miha, and Zuriaga-Puig, Jaume
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
The detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts of this gravitational wave event, ushered in a new era of multimessenger astronomy, providing the first direct evidence that BNS mergers are progenitors of short gamma-ray bursts (GRBs). Such events may also produce very-high-energy (VHE, > 100GeV) photons which have yet to be detected in coincidence with a gravitational wave signal. The Cherenkov Telescope Array (CTA) is a next-generation VHE observatory which aims to be indispensable in this search, with an unparalleled sensitivity and ability to slew anywhere on the sky within a few tens of seconds. New observing modes and follow-up strategies are being developed for CTA to rapidly cover localization areas of gravitational wave events that are typically larger than the CTA field of view. This work will evaluate and provide estimations on the expected number of of gravitational wave events that will be observable with CTA, considering both on- and off-axis emission. In addition, we will present and discuss the prospects of potential follow-up strategies with CTA., Comment: Presented at the 38th International Cosmic Ray Conference (ICRC 2023), 2023 (arXiv:2309.08219)
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- 2023
3. Present and Future constraints on Secluded Dark Matter in the Galactic Halo with TeV Gamma-ray Observatories
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Fortes, Guilherme, Queiroz, Farinaldo, Siqueira, Clarissa, and Viana, Aion
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High Energy Physics - Phenomenology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
The dark matter relic density may be governed by the presence of new mediators that connect the dark matter field with the Standard Model particles. When the dark matter particle mass is larger than the mediator's, the pair production of mediators is kinematically open. This setup is known in the literature as secluded dark matter. Motivated by the appearance of secluded dark matter in several model building endeavours, we investigate the sensitivity of TeV gamma-ray instruments in the Southern Hemisphere namely, H.E.S.S., CTA, and SWGO to secluded dark matter annihilating in the Galactic Halo. We exploit the complementarity aspects of these detectors to find restrictive bounds on the annihilation cross-section for different annihilation channels. In particular, for a dark matter particle mass of $2$~TeV, H.E.S.S. is able to constraint $\langle \sigma v \rangle \geq 4 \times 10^{-26}\,\, {\rm cm}^3\, {\rm s}^{-1}$ at 95\% confidence level for the $4q$ and $4\tau$ channel, while CTA will be sensitive to $\langle \sigma v \rangle \geq 7 \times 10^{-27}\,\, {\rm cm}^3\, {\rm s}^{-1}$ and SWGO $\langle \sigma v \rangle \geq 6 \times 10^{-27}\,\, {\rm cm}^3\, {\rm s}^{-1}$ for the $4\tau$ channel, both well below the thermal relic cross-section. In fact, the combination of CTA and SWGO will be able to probe cross-sections below the thermal relic value for dark matter particles in the whole mass range between 100 GeV and 100 TeV in the $4q$ and $4\tau$ channels, and between 100 GeV and $\sim$40 TeV in the $4b$ channel., Comment: 20 pages
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- 2022
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4. Roads for Right-handed Neutrino Dark Matter: Fast Expansion, Standard Freeze-out, and Early Matter Domination
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Arcadi, Giorgio, Neto, Jacinto Paulo, Queiroz, Farinaldo S., and Siqueira, Clarissa
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High Energy Physics - Phenomenology - Abstract
Right-handed neutrinos appear in several extensions beyond the Standard Model, specially in connection to neutrino masses. Motivated by this, we present a model of right-handed neutrino dark matter that interacts with Standard Model particles through a new gauge symmetry as well as via mass mixing between the new vector field and the Z boson, and investigate different production mechanisms. We derive the dark matter relic density when the Hubble rate is faster than usual, when dark matter decouples in a matter domination epoch, and when it decouples in a radiation domination regime, which is then followed by a matter domination era. The direct detection rate features a spin-independent but velocity suppressed operators, as well as a spin-dependent operator when the mass mixing is correctly accounted for. We put all these results into perspective with existing flavor physics, atomic parity violation, and collider bounds. Lastly, we outline the region of parameter space in which a weak scale right-handed neutrino dark matter stands as a viable dark matter candidate., Comment: 15 pages, 8 figures
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- 2021
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5. New Standardized Loco-Regional Anesthesia Based for Dacryocystorhinostomy: Role for Blunt Canula Ultrassonographic Guided
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Siqueira, Hugo C. T., primary, Siqueira, Clarissa M. M. Stoffel de, additional, Lima, Marlon Miguel Bianchi de, additional, and Lins, Leonardo T. C., additional
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- 2023
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6. Explaining the AMS positron excess via Right-handed Neutrinos
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Queiroz, Farinaldo S. and Siqueira, Clarissa
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High Energy Physics - Phenomenology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We have witnessed in the past decade the observation of a puzzling cosmic-ray excess at energies larger than $10$ GeV. The AMS-02 data published this year has new ingredients such as the bump around $300$ GeV followed by a drop at $800$ GeV, as well as smaller error bars. Adopting the background used by the AMS-02 collaboration in their analysis, one can conclude that previous explanations to the new AMS-02 such as one component annihilating and decaying dark matter as well as pulsars seem to fail at reproducing the data. Here, we show that in the right-handed neutrino portal might reside the answer. We discuss a decaying two-component dark matter scenario where the two-body decay products are right-handed neutrinos that have their decay pattern governed by the type I seesaw mechanism. This setup provides a very good fit to data, for example, for a conservative approach including just statistical uncertainties leads to $\chi^2/d.o.f \sim 2.3$ for $m_{DM_1}=2150$ GeV with $\tau_{1}=3.78 \times 10^{26}$ s and $m_{DM_2}=300$ with $\tau_{2}=5.0 \times 10^{27}$ s for $M_N=10$ GeV, and, in an optimistic case, including systematic uncertainties, we find $\chi^2/d.o.f \sim 1.12$, for $M_N = 10$ GeV, with $m_{DM_1}=2200$ GeV with $\tau_{1}=3.8 \times 10^{26}$ s and $m_{DM_2}=323$ GeV with $\tau_{2}=1.68 \times 10^{27}$ s., Comment: 9 pages, 10 figures; Accepted for publication in PRD
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- 2019
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7. Has AMS-02 observed two-component dark matter?
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Profumo, Stefano, Queiroz, Farinaldo, and Siqueira, Clarissa
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dark matter ,indirect detection ,cosmic rays ,decaying DM ,hep-ph ,astro-ph.HE ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Nuclear & Particles Physics - Abstract
There is convincing observational evidence for an increasing cosmic-raypositron-to-electron ratio at energies larger than $\sim 10$~GeV, at odds withexpectations from secondary positron production. The most recent AMS-02 dataexhibit an interesting spectral feature consisting of a bump at an energyaround $300$~GeV followed by a drop around $\sim 800$~GeV. A possibleexplanation to the most recent data is that the excess positron originates fromdecaying dark matter. Here, we show that models consisting of two dark matterparticle species contributing equally to the global cosmological dark matterdensity provide strikingly good fits to the data. The favored models, with abest-fit with $\chi^2/d.o.f \sim 0.5$ consist of a first species weighing$750$~GeV decaying with a lifetime $\tau_{\chi}\sim 10^{26}$~s to $\tau$ leptonpairs (or to a pair of vector bosons subsequently decaying to a $\tau$ paireach), and a second species with a mass around 2.3 TeV decaying to $\mu$ leptonpairs. We provide a few possible concrete realizations for this scenario.
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- 2021
8. An Overview of Ultrasound-guided Peribulbar Block with Blunt Canula for Cataract Surgery
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Siqueira, Hugo Camara Tinoco de, primary, Siqueira, Clarissa Maria Motta Stoffel de, additional, Lima, Marlon Miguel Bianchi de, additional, and Lins, Leonardo Teixeira Carneiro, additional
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- 2023
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9. Has AMS-02 Observed Two-Component Dark Matter?
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Profumo, Stefano, Queiroz, Farinaldo, and Siqueira, Clarissa
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High Energy Physics - Phenomenology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
There is convincing observational evidence for an increasing cosmic-ray positron-to-electron ratio at energies larger than $\sim 10$~GeV, at odds with expectations from secondary positron production. The most recent AMS-02 data exhibit an interesting spectral feature consisting of a bump at an energy around $300$~GeV followed by a drop around $\sim 800$~GeV. A possible explanation to the most recent data is that the excess positron originates from decaying dark matter. Here, we show that models consisting of two dark matter particle species contributing equally to the global cosmological dark matter density provide strikingly good fits to the data. The favored models, with a best-fit with $\chi^2/d.o.f \sim 0.5$ consist of a first species weighing $750$~GeV decaying with a lifetime $\tau_{\chi}\sim 10^{26}$~s to $\tau$ lepton pairs (or to a pair of vector bosons subsequently decaying to a $\tau$ pair each), and a second species with a mass around 2.3 TeV decaying to $\mu$ lepton pairs. We provide a few possible concrete realizations for this scenario., Comment: 6 pages, 2 figures
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- 2019
10. Secluded Dark Matter in light of the Cherenkov Telescope Array (CTA)
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Siqueira, Clarissa
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High Energy Physics - Phenomenology - Abstract
Secluded dark matter is one of the most popular dark matter models, where dark matter annihilations go into particles that belong to a dark sector. An interesting way to probe such models is via indirect detection. In particular, gamma-ray observations are rather promising. Taking into account $1\%$ level of systematics, in this work we show that the Cherenkov Telescope Array (CTA) will place the most stringent bounds on the dark matter annihilation cross section, surpassing existing probes based on H.E.S.S., Fermi-LAT, and Planck data, for dark matter masses above $400$ GeV, independently of the channel and choosing the Einasto profile. We consider scenarios of secluded annihilations into leptophilic, leptophobic scalars and Higgs-like particles being able to exclude an annihilation cross section of $1.7 \times 10^{-25}$ cm$^3 \,$s$^{-1}$ for $m_{DM}=5000$ GeV, for $\phi \to e^+e^-$ channel, for example, exceeding the current limits by one order of magnitude., Comment: 9 pages, 14 figures. Matches version published in PLB
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- 2019
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11. Search for Semi-Annihilating Dark Matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array
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Queiroz, Farinaldo S. and Siqueira, Clarissa
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High Energy Physics - Phenomenology - Abstract
Dark matter annihilations have been fiercely restricted by the non-observation of excess events in indirect detection probes. Typically the interactions that dictate annihilation are also present in the dark matter-nucleon scattering cross section, also severely constrained by direct detection experiments. Semi-annihilations arise as a possible way to ameliorate the tension and even change the standard dark matter relic density calculation. In this work, we derive indirect detection bounds for several semi-annihilation channels including gauge bosons, the Higgs, leptophilic and leptophobic scalars. Our analysis is based on the gamma-ray observations in the direction of Dwarf Spheroidal Galaxies (Fermi-LAT) and the Galactic Center (H.E.S.S.), and Planck measurements of Cosmic Background Radiation. In addition, we derive the prospects for the Cherenkov Telescope Array (CTA) sensitivity to all these semi-annihilation modes., Comment: 18 pages, 8 figures, version accepted for publication in JCAP
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- 2019
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12. MeV Dark Matter Complementarity and the Dark Photon Portal
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Dutra, Maíra, Lindner, Manfred, Profumo, Stefano, Queiroz, Farinaldo S., Rodejohann, Werner, and Siqueira, Clarissa
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High Energy Physics - Phenomenology - Abstract
We discuss the phenomenology of an MeV-scale Dirac fermion coupled to the Standard Model through a dark photon with kinetic mixing with the electromagnetic field. We compute the dark matter relic density and explore the interplay of direct detection and accelerator searches for dark photons. We show that precise measurements of the temperature and polarization power spectra of the Cosmic Microwave Background Radiation lead to stringent constraints, leaving a small window for the thermal production of this MeV dark matter candidate. The forthcoming MeV gamma-ray telescope e-ASTROGAM will offer important and complementary opportunities to discover dark matter particles with masses below 10 MeV. Lastly, we discuss how a late-time inflation episode and freeze-in production could conspire to yield the correct relic density while being consistent with existing and future constraints., Comment: 27 pages, 7 figures. It matched published version
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- 2018
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13. Searching for Secluded Dark Matter with H.E.S.S., Fermi-LAT, and Planck
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Profumo, Stefano, Queiroz, Farinaldo S., Silk, Joseph, and Siqueira, Clarissa
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High Energy Physics - Phenomenology ,Astrophysics - High Energy Astrophysical Phenomena ,High Energy Physics - Experiment - Abstract
Short-lived mediators are often used to describe dark matter interactions with Standard Model particles. When the dark matter mass is heavier than the mass of the mediator, it may self-annihilate into short-lived mediators, and in some cases this might be the dominant annihilation channel. This scenario is known as secluded dark matter. We use Fermi-LAT observations of dwarf spheroidal galaxies, H.E.S.S. data from the Galactic center, and Planck measurements of the Cosmic Microwave Background to constrain secluded dark matter. We explore the interplay between these experiments and we assess the impact of the mediator mass on our bounds, an often overlooked yet very important point. In particular, we exclude pair -annihilation cross-sections greater or on the order of $\sigma v \sim 4 \times 10^{-27} {\rm cm^3/s}$ for dark matter masses around $10$~GeV and greater or on the order of $\sigma v \sim \times 10^{-25} {\rm cm^3/s}$ for dark matter masses around a TeV. Our findings supersede previous constraints which use Fermi-LAT data, and constitute the first limits on secluded dark sectors using the H.E.S.S. telescope. We also show that one can fit TeV gamma-ray observations from H.E.S.S. with secluded dark matter annihilations, with the mediator mass impacting the best-fit dark matter particle mass. Our findings indicate that any assessment of secluded dark sectors in the context of indirect detection significantly depends on the choice of the mediator mass., Comment: 29 pages, 12 figures. References included and H.E.S.S. limits updated
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- 2017
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14. On the Higgs-like boson in the Minimal Supersymmetric 3-3-1 Model
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Ferreira Jr, J. G., Pires, C. A. de S., da Silva, P. S. Rodrigues, and Siqueira, Clarissa
- Subjects
High Energy Physics - Phenomenology - Abstract
It is imperative that any proposal of new physics possesses a Higgs-like boson with 125 GeV of mass and couplings with the standard particles that recover the branching ratios and signal strengths as measured by CMS and ATLAS. We address this issue within the supersymmetric version of the minimal 3-3-1 model. For this we develop the Higgs potential with focus on the lightest Higgs provided by the model. Our proposal is to verify if it recovers the properties of the standard Higgs. With respect to its mass, we calculate it up to one loop level by taking into account all contributions provided by the model. In regard to its couplings, we restrict our investigation to couplings of the Higgs-like boson with the standard particles, only. We then calculate the dominant branching ratios and the respective signal strengths and confront our results with the recent measurements of CMS and ATLAS. As distinctive aspects, we remark that our Higgs-like boson intermediates flavor changing neutral processes and then argue that its signature is the decay $t \rightarrow h+c$. We calculate its branching ratio and compare it with current bounds. We also show that the potential is stable for the region of parameter space employed in our calculations., Comment: 20 pages, 10 figures
- Published
- 2017
- Full Text
- View/download PDF
15. The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
- Author
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Arcadi, Giorgio, Queiroz, Farinaldo S., and Siqueira, Clarissa
- Subjects
High Energy Physics - Phenomenology - Abstract
A puzzling excess in gamma-rays at GeV energies has been observed in the center of our galaxy using Fermi-LAT data. Its origin is still unknown, but it is well fitted by Weakly Interacting Massive Particles (WIMPs) annihilations into quarks with a cross section around $10^{-26}{\rm cm^3 s^{-1}}$ with masses of $20-50$~GeV, scenario which is promptly revisited. An excess favoring similar WIMP properties has also been seen in anti-protons with AMS-02 data potentially coming from the Galactic Center as well. In this work, we explore the possibility of fitting these excesses in terms of semi-annihilating dark matter, dubbed as semi-Hooperon, with the process ${\rm WIMP\, WIMP \rightarrow WIMP\, X}$ being responsible for the gamma-ray excess, where X=h,Z. An interesting feature of semi-annihilations is the change in the relic density prediction compared to the standard case, and the possibility to alleviate stringent limits stemming from direct detection searches. Moreover, we discuss which models might give rise to a successful semi-Hooperon setup in the context of $\mathcal{Z}_3$,$\mathcal{Z}_4$ and extra "dark" gauge symmetries., Comment: 8 pages, 3 figures, version published in Phys. Lett. B
- Published
- 2017
- Full Text
- View/download PDF
16. Constraining Flavor Changing Interactions from LHC Run-2 Dilepton Bounds with Vector Mediators
- Author
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Queiroz, Farinaldo S., Siqueira, Clarissa, and Valle, José W. F.
- Subjects
High Energy Physics - Phenomenology - Abstract
Within the context of vector mediators, is a new signal observed in flavor changing interactions, particularly in the neutral mesons systems $K^{0}-\bar{K}^{0}$, $D^{0}-\bar{D}^{0}$ and $B^0-\bar{B^0}$, consistent with dilepton resonance searches at the LHC? In the attempt to address this very simple question, we discuss the complementarity between flavor changing neutral current (FCNC) and dilepton resonance searches at the LHC run 2 at $13$TeV with $3.2\, {\rm fb^{-1}}$ of integrated luminosity, in the context of vector mediators at tree level. Vector mediators, are often studied in the flavor changing framework, specially in the light of the recent LHCb anomaly observed at the rare B decay. However, the existence of stringent dilepton bound severely constrains flavor changing interactions, due to restrictive limits on the $Z^{\prime}$ mass. We discuss this interplay explicitly in the well motivated framework of a 3-3-1 scheme, where fermions and scalars are arranged in the fundamental representation of the weak SU(3) gauge group. Due to the paucity of relevant parameters, we conclude dilepton data leave little room for a possible new physics signal stemming from these systems, unless a very peculiar texture parametrization is used in the diagonalization of the CKM matrix. In other words, if a signal is observed in such flavor changing interactions, it is unlikely comes from a 3-3-1 model., Comment: 8 pages, 9 figures, Matches version accepted in Phys. Lett. B
- Published
- 2016
- Full Text
- View/download PDF
17. Searching for secluded dark matter with H.E.S.S., Fermi-LAT, and Planck
- Author
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Profumo, Stefano, Queiroz, Farinaldo S, Silk, Joseph, and Siqueira, Clarissa
- Subjects
dark matter theory ,particle physics-cosmology connection ,hep-ph ,astro-ph.HE ,hep-ex ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Nuclear & Particles Physics - Abstract
Short-lived mediators are often used to describe dark matter interactions with Standard Model particles. When the dark matter mass is heavier than the mass of the mediator, it may self-annihilate into short-lived mediators, and in some cases this might be the dominant annihilation channel. This scenario is known as secluded dark matter. We use Fermi-LAT observations of dwarf spheroidal galaxies, H.E.S.S. data from the Galactic center, and Planck measurements of the Cosmic Microwave Background to constrain secluded dark matter. We explore the interplay between these experiments and we assess the impact of the mediator mass on our bounds, an often overlooked yet very important point. In particular, we exclude pair -annihilation cross-sections greater or on the order of σ v ∼ 4 × 10-27 cm3/s for dark matter masses around 10 GeV and greater or on the order of σ v ∼ × 10-25 cm3/s for dark matter masses around a TeV . Our findings supersede previous constraints which use Fermi-LAT data, and constitute the first limits on secluded dark sectors using the H.E.S.S. telescope. We also show that one can fit TeV gamma-ray observations from H.E.S.S. with secluded dark matter annihilations, with the mediator mass impacting the best-fit dark matter particle mass. Our findings indicate that any assessment of secluded dark sectors in the context of indirect detection significantly depends on the choice of the mediator mass.
- Published
- 2018
18. Higgs mass and right-handed sneutrino WIMP in a supersymmetric 3-3-1 model
- Author
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Pires, C. A. de S., da Silva, P. S. Rodrigues, Santos, A. C. O., and Siqueira, Clarissa
- Subjects
High Energy Physics - Phenomenology - Abstract
This work deals with right handed sneutrino as thermal cold dark matter candidate. This scalar emerges in a supersymmetric version of $SU(3)_c \otimes SU(3)_L \otimes U(1)_X$ gauge model where right handed neutrinos are a natural component of leptonic chiral scalar supermultiplets. We first consider the issue of a $125$~GeV Higgs boson mass in this model, showing that constraints on stop mass and trilinear soft coupling are considerably alleviated compared to MSSM. Then we investigate the region of parameter space that is consistent with right handed sneutrino as thermal cold dark matter, under the light of Planck results on the relic abundance and direct detection from LUX experiment. This sneutrino mainly annihilates through an extra neutral gauge boson, $Z^\prime$, and Higgs exchange, so that the physics of dark matter is somewhat related to the parameters determining Higgs and $Z^\prime$ masses. We then obtain that right handed sneutrino in this model must be heavier than $400$~GeV to conform with Planck and LUX, simultaneously constraining the $Z^\prime$ mass to be above 2400~GeV, which is in perfect agreement with LHC searches in a non-supersymmetric version of this model., Comment: Minor changes, references added, 20 pages, 4 figures and 1 table
- Published
- 2016
- Full Text
- View/download PDF
19. Composite Higgs Models, Technicolor and The Muon Anomalous Magnetic Moment
- Author
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Doff, A. and Siqueira, Clarissa
- Subjects
High Energy Physics - Phenomenology - Abstract
We revisit the muon magnetic moment (g-2) in the context of Composite Higgs models and Technicolor, and provide general analytical expressions for computing the muon magnetic moment stemming from new fields such as, neutral gauge bosons, charged gauge bosons, neutral scalar, charged scalars, and exotic charged leptons type of particles. Under general assumptions we assess which particle content could address the $g-2_{\mu}$ excess. Moreover, we take a conservative approach and derive stringent limits on the particle masses in case the anomaly is otherwise resolved and comment on electroweak and collider bounds. Lastly, for concreteness we apply our results to a particular Technicolor model., Comment: 9 pages, 5 figures
- Published
- 2015
- Full Text
- View/download PDF
20. COSMOS
- Author
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Queiroz, Farinaldo da Silva, primary, Lima, Elisama, additional, Holanda, Rodrigo, additional, Hepp, Patricia, additional, and Siqueira, Clarissa, additional
- Published
- 2021
- Full Text
- View/download PDF
21. On the Higgs-like boson in the minimal supersymmetric 3-3-1 model
- Author
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Ferreira, Jr, J. G., Pires, C. A. de S., da Silva, P. S. Rodrigues, and Siqueira, Clarissa
- Published
- 2018
- Full Text
- View/download PDF
22. Roads for right-handed neutrino dark matter: Fast expansion, standard freeze-out, and early matter domination
- Author
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Arcadi, Giorgio, primary, Neto, Jacinto Paulo, additional, Queiroz, Farinaldo S., additional, and Siqueira, Clarissa, additional
- Published
- 2022
- Full Text
- View/download PDF
23. Ultrasound-Guided Peribulbar Block with Blunt Canula for Cataract Surgery: A Review of Historical Case-Series
- Author
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Siqueira, Hugo C. T., primary, De Siqueira, Clarissa M. M. Stoffel, additional, De Lima, Marlon Miguel Bianchi, additional, and Lins, Leonardo T. C., additional
- Published
- 2022
- Full Text
- View/download PDF
24. Indirect Searches for Secluded Dark Matter
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Siqueira, Clarissa, primary, Viana, Aion, additional, queiroz, FARINALDO, additional, and Fortes, Guilherme, additional
- Published
- 2021
- Full Text
- View/download PDF
25. New Anesthetic Technique for Dacryocystorhinostomy: 218 Cases with Local-Anesthesia Ultrasonographic Guided and Blunt Cannula
- Author
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Siqueira, Hugo C. T., primary, de Siqueira, Clarissa M. M. Stoffel, additional, de Lima, Marlon Miguel Bianchi, additional, and Lins, Leonardo T. C., additional
- Published
- 2021
- Full Text
- View/download PDF
26. Has AMS-02 observed two-component dark matter?
- Author
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Profumo, Stefano, primary, Queiroz, Farinaldo, additional, and Siqueira, Clarissa, additional
- Published
- 2020
- Full Text
- View/download PDF
27. Explaining the AMS positron excess via right-handed neutrinos
- Author
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Queiroz, Farinaldo S., primary and Siqueira, Clarissa, additional
- Published
- 2020
- Full Text
- View/download PDF
28. Secluded dark matter in light of the Cherenkov Telescope Array (CTA)
- Author
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Siqueira, Clarissa, primary
- Published
- 2019
- Full Text
- View/download PDF
29. Complementaridade em análises de modelos de matéria escura
- Author
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Siqueira, Clarissa Martins and Silva, Paulo Sérgio Rodrigues da
- Subjects
Abundância relíquia ,Detecção direta ,Detecção indireta ,Direct detection ,Complementary ,Indirect detection ,Dark matter ,Matéria escura ,Relic abundance ,Complementaridade ,CIENCIAS EXATAS E DA TERRA::FISICA [CNPQ] - Abstract
The Dark Matter (DM) remains one of the most important open problems concerning Particle Physics and Cosmology. In face of this problem, we propose extensions of the Standard Model with possible Dark Matter candidates. In the supersymmetric version of the 331 model with right-handed neutrinos, we study the sneutrino as a DM candidate, we compute the relic abundance and scattering cross section in order to compare with the Planck and LUX results, respectively. We found good candidates in the TeV mass scale. Due to lack of WIMP observation in direct and collider experiments, other possible candidates have been extensively studied in the literature. In this sense, we study models with light DM mediated by Dark Photons, we compute different production modes, including thermally and non-thermally. In addition, we compute the annihilation and scattering cross-section in order to compare with results of Planck and XENON, respectively, and, with specific constraints on Dark Photons. We found viable candidates with mass in the MeV scale. Regarding indirect detection, we use Secluded Models, whose DM particles interact with meta-stable mediators that decay into Standard Model particles, to impose strong constraints on the annihilation cross section through experimental data looking for y−ray fluxes due to DM annihilation from Secluded WIMPs in dwarf spheroidal galaxies, using data from Fermi-LAT experiment, and the galactic center, using data from H.E.S.S. experiment. Finally, we analyze whether semi-annihilation models are able to provide a y−ray flux compatible with the excess observed by Fermi-LAT experiment, we found that the channel ME +ME ! ME + h provides a good fit to the data. Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq A Matéria Escura (ME) permanece como um dos principais problemas em aberto no que concerne à Física de Partículas e Cosmologia. Diante deste problema, propõe-se extensões do Modelo Padrão de Física de Partículas com possíveis candidatos à ME. Na versão supersimétrica do modelo 331 com neutrinos de mão direita, estuda-se o sneutrino como possível candidato WIMP, computa-se a abundância relíquia e seção de choque de espalhamento, e compara-se com os experimentos Planck e LUX, respectivamente. Neste caso, mostra-se que há candidatos viáveis com massa na escala de TeV. Devido à ausência de sinais de WIMPs em experimentos de Detecção Direta e colisores, até então, outros possíveis candidatos vêm sendo amplamente estudados na literatura. Neste sentido, estuda-se o modelo com ME leve mediada por Fótons Escuros, abordando diferentes formas de produção da ME, incluindo térmica e não-termicamente. Além disso, são calculadas as seções de choque de aniquilação e espalhamento, de forma a comparar com os vínculos atuais do Planck e XENON, respectivamente, e com os vínculos sobre Fótons Escuros, com isto, são obtidos candidatos viáveis com massa na escala de MeV. No que se refere à detecção indireta, utilizando-se de Modelos confinados no setor escuro (Secluded Models), cuja partícula de ME se conecta com mediadores meta-estáveis que decaem em partículas do Modelo Padrão, impõe-se fortes vínculos sobre a seção de choque de aniquilação de ME através dos dados experimentais de busca por fluxos de raios−y provenientes de aniquilações de WIMPs Isoladas em galáxias esféricas anãs, utilizando dados do experimento Fermi-LAT, e no centro da galáxia, utilizando dados do experimento H.E.S.S.. Por fim, é feita uma análise sobre modelos de semi-aniquilação, com o intuito de checar se estes fornecem o excesso de raios−y, observado no centro da galáxia pelo Fermi-LAT, mostra-se que o canal ME +ME ! ME + h fornece um bom ajuste.
- Published
- 2018
30. Search for semi-annihilating dark matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array
- Author
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Queiroz, Farinaldo S., primary and Siqueira, Clarissa, additional
- Published
- 2019
- Full Text
- View/download PDF
31. Composite Higgs models, Technicolor and the muon anomalous magnetic moment
- Author
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Doff, A. and Siqueira, Clarissa
- Published
- 2016
- Full Text
- View/download PDF
32. MeV dark matter complementarity and the dark photon portal
- Author
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Dutra, Maíra, primary, Lindner, Manfred, additional, Profumo, Stefano, additional, Queiroz, Farinaldo S., additional, Rodejohann, Werner, additional, and Siqueira, Clarissa, additional
- Published
- 2018
- Full Text
- View/download PDF
33. The semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
- Author
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Arcadi, Giorgio, primary, Queiroz, Farinaldo S., additional, and Siqueira, Clarissa, additional
- Published
- 2017
- Full Text
- View/download PDF
34. Constraining flavor changing interactions from LHC Run-2 dilepton bounds with vector mediators
- Author
-
Queiroz, Farinaldo S., primary, Siqueira, Clarissa, additional, and Valle, José W.F., additional
- Published
- 2016
- Full Text
- View/download PDF
35. Higgs mass and right-handed sneutrino WIMP in a supersymmetric3−3−1model
- Author
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Pires, C. A. de S., primary, da Silva, P. S. Rodrigues, additional, Santos, A. C. O., additional, and Siqueira, Clarissa, additional
- Published
- 2016
- Full Text
- View/download PDF
36. Matéria escura no Modelo Padrão Supersimétrico Mínimo
- Author
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Siqueira, Clarissa Martins and Silva, Paulo Sérgio Rodrigues da
- Subjects
Supersimetria ,Detecção Direta SI e SD ,Matéria Escura ,FISICA [CIENCIAS EXATAS E DA TERRA] ,Dark Matter ,Supersymmetry ,Model Supersymmetric Minimum - MSSM ,Modelo Padrão Supersimétrico Mínimo - MSSM ,Abundância Relíquia ,Relic Abundance ,SD and SI direct detection - Abstract
One of the main problems that permeates the Particle Physics and Cosmology is the Dark Matter (DM), which makes up about 26% of the energy content of the Universe. The main evidence pointing to its existence provides us with important features, such as being neutral, stable (with lifetime over the age of the Universe), cold or warm, weakly interacting with Particle Physics Standard Model (SM) particles and sufficiently abundant. The SM does not provide a candidate who meets these characteristics and hence it is necessary to extend it. One of the most sophisticated extensions of the SM is the Supersymmetry, that in addition to solving the problem of DM, explains other unsolved puzzles that are present in SM, among them, the hierarchy and the unification of the gauge couplings. This model implies the inclusion of a new symmetry that puts bosons and fermions in equal footing. The minimal supersymmetric version of the SM is the Minimal Supersymmetric Standard Model (MSSM), whose viable candidate is the neutralino, which is a fermion composed of superpartners of neutral Higgs and gauge bosons. In this work, we performed the neutralino analysis as DM candidate in CMSSM or mSUGRA scenario, which contains 5 free parameters, M0, M1/2, tan , sign(μ) and A0, for two different analyzes. In the first one we varied the M0 and M1/2 parameters for three different values of tan while in the second and third one we varied all parameters except the sign(μ). In this study, we use some computational tools, including, SARAH, SPheno, SSP and Micromegas, in order to obtain DM Relic Abundance and DM scattering cross section in this scenario. We compared our results with the most recent experimental data, namely, we have used Planck satellite data for the relic abundance, LUX and XENON1T (prospect) for the spin-independent scattering cross section and XENON100 for the spin dependent one. We finally analyzed the implications concerning the viability of the MSSM under the light of the DM problem. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Um dos principais problemas que permeia a Física de Partículas e Cosmologia é a Matéria Escura (ME), que compõe cerca de 26% do conteúdo energético do Universo. As principais evidências que apontam para a sua existência nos fornecem importantes características, tais como, ser neutra, estável (com tempo de vida maior que a idade do Universo), fria ou morna, pouco interagente com partículas do Modelo Padrão de Física de Partículas (MP)e suficientemente abundante. O MP não fornece um candidato que supre estas características, sendo necessário estendê-lo. Uma das mais sofisticadas extensões do MP é a Supersimetria, que além de resolver o problema da ME, soluciona outros que estão presentes no MP, dentre eles, a hierarquia e a unificação dos acoplamentos de gauge. Tal modelo implica na inclusão de uma nova simetria que coloca bósons e férmions em pé de igualdade. A versão mínima supersimétrica do MP é o Modelo Padrão Supersimétrico Mínimo (MSSM), cujo candidato viável à ME é o neutralino, que se trata de um férmion composto pelos superparceiros dos bósons de gauge e Higgs neutros. Neste trabalho, fizemos uma análise do neutralino como candidato à ME no cenário CMSSM ou mSUGRA, que contém 5 parâmetros livres, M0, M1/2, tan , sinal(μ) e A0, para três análises distintas. Na primeira variamos apenas os parâmetros M0 e M1/2 para três valores distintos da tan e na segunda e terceira variamos todos os parâmetros com exceção do sinal(μ). Neste estudo, utilizamos algumas ferramentas computacionais, entre as quais, SARAH, SPheno, SSP e micrOMEGAs, no intuito de obter abundância e seção de choque de espalhamento de ME neste cenário. Obtidos os gráficos, comparamos com os resultados experimentais mais recentes, para a abundância utilizamos dados do satélite Planck, para a seção de choque de espalhamento independente de spin, o LUX e XENON1T (2017) e para dependente de spin, XENON100 e verificamos suas implicações na viabilidade do modelo.
- Published
- 2015
37. Teores de tatinos e flavonóides em plantas medicinais da caatinga: avaliando estratégias de bioprospecção
- Author
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Fernanda de Queiroz Siqueira, Clarissa and Paulino de Albuquerque, Ulysses
- Subjects
Etnofarmacologia ,Compostos fenólicos ,Fitoquímica - Abstract
Conselho Nacional de Desenvolvimento Científico e Tecnológico Ainda existem poucos estudos que permitam uma visão mais ampla da grande diversidade de espécies da Caatinga utilizadas na medicina popular. Dentre os bioativos destas plantas características da vegetação Caatinga que são utilizadas para fins terapêuticos estão os polifenóis, mais precisamente os taninos e os flavonóides. Esses compostos que servem de mecanismo de defesa para as plantas contra patógenos e herbívoros, exibem uma vasta gama de propriedades farmacológicas. Portanto, avaliou-se a relação entre os teores destes compostos fenólicos (taninos e flavonóides) com três grupos de indicações terapêuticas de plantas usadas popularmente na Caatinga: antimicrobiana, antidiabética e antidiarréica. Assim, a presente proposta foi baseada em uma pergunta norteadora: o teor de compostos fenólicos (taninos e flavonóides) guarda relação com grupos de plantas indicadas popularmente para afecções relacionadas com a atividade desses compostos? A seleção das plantas foi baseada em um levantamento etnobotânico realizado na comunidade do Carão, localizada no município de Altinho que fica a 163,1 km do Recife. Após secagem à temperatura ambiente, o material foi triturado e devidamente armazenado. Para doseamento dos taninos foi utilizada a técnica de Difusão Radial, e para quantificação de Flavonóides totais foi utilizado um ensaio baseado na complexação dos flavonóides em cloreto de alumínio. Foi observado que houve uma maior ocorrência de compostos tânicos no grupo das plantas indicadas como antimicrobianas podendo esta indicação terapêutica motivar pesquisas futuras por apresentar uma possível relação com este composto
- Published
- 2011
38. Levels of Tannins and Flavonoids in Medicinal Plants: Evaluating Bioprospecting Strategies
- Author
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Siqueira, Clarissa Fernanda de Queiroz, primary, Cabral, Daniela Lyra Vasconcelos, additional, Peixoto Sobrinho, Tadeu José da Silva, additional, de Amorim, Elba Lúcia Cavalcanti, additional, de Melo, Joabe Gomes, additional, Araújo, Thiago Antônio de Sousa, additional, and de Albuquerque, Ulysses Paulino, additional
- Published
- 2012
- Full Text
- View/download PDF
39. Plant Stem Bark Extractivism in the Northeast Semiarid Region of Brazil: A New Aport to Utilitarian Redundancy Model
- Author
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Ferreira Júnior, Washington Soares, primary, Siqueira, Clarissa Fernanda Queiroz, additional, and de Albuquerque, Ulysses Paulino, additional
- Published
- 2012
- Full Text
- View/download PDF
40. Levels of Tannins and Flavonoids in Medicinal Plants: Evaluating Bioprospecting Strategies.
- Author
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de Queiroz Siqueira, Clarissa Fernanda, Vasconcelos Cabral, Daniela Lyra, da Silva Peixoto Sobrinho, Tadeu José, de Amorim, Elba Lúcia Cavalcanti, de Melo, Joabe Gomes, de Sousa Araúujo, Thiago Antônio, and de Albuquerque, Ulysses Paulino
- Abstract
There are several species of plants used by traditional communities in the Brazilian semiarid. An approach used in the search for natural substances that possess therapeutic value is ethnobotany or ethnopharmacology. Active substances that have phenolic groups in their structure have great pharmacological potential. To establish a quantitative relationship between the species popularly considered to be antimicrobial, antidiabetic, and antidiarrheal, the contents of tannins and flavonoids were determined. The plant selection was based on an ethnobotanical survey conducted in a community located in the municipality of Altinho, northeastern Brazil. For determination of tannin content was utilized the technique of radial diffusion, and for flavonoids, an assay based on the complexation of aluminum chloride. The group of plants with antimicrobial indications showed a higher content of tannins compared to the control groups. The results evidence suggests a possible relationship between these compounds and the observed activity. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
41. Relic abundances from the Boltzmann equation
- Author
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Ramos, Camila Pereira, Viana, Aion, Dias, Alex Gomes, Holanda, Rodrigo Fernandes Lira de, Siqueira, Clarissa Martins, and Queiroz, Farinaldo da Silva
- Subjects
Abundância de relíquias ,Física ,Matéria escura ,Equação de Boltzmann ,WIMPs - Abstract
Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq Dados observacionais que suportam a existência de matéria escura (ME) têm sido amplamente documentados, apontando para a presença de uma matéria não barionica, responsável por cerca de 25% da quantidade de energia do Universo. Contudo, tal tipo de matéria não foi detectada até o momento e o modelo padrão de física de partículas (MP) não possui uma explicação para ME. Neste trabalho, as partículas massivas fracamente interagentes (WIMPs) são apresentadas. É, então, o objetivo principal mostrar que estes candidatos à ME geram a abundância necessária para obter a quantidade estimada de ME no Universo. Esse resultado é obtido através da solução da equação de Boltzmann no cenário do Universo primordial. Observational data that support the existence of dark matter (DM) has been largely documented, pointing to the presence of a non-baryonic matter that is responsible for around 25% of the energy budget of the Universe. However, such type of matter has not been detected so far, and the standard model of particle physics (SM) does not have an explanation for DM. In this work, the weakly interacting massive particles (WIMPs), the main candidates for DM, are presented. It is then the main goal to show that this DM candidate generates the abundance required to obtain the estimated amount of DM in the Universe. This result is obtained by solving the Boltzmann equation, in the early Universe scenario.
- Published
- 2021
42. Higgs mass and right-handed sneutrino WIMP in a supersymmetric 3-3-1 model.
- Author
-
de S. Pires, C. A., da Silva, P. S. Rodrigues, Santos, A. C. O., and Siqueira, Clarissa
- Subjects
- *
HIGGS bosons , *DARK matter , *NEUTRINOS - Abstract
This work deals with the right-handed sneutrino as thermal cold dark matter candidate. This scalar emerges in a supersymmetric version of the SU(3)c⊗SU(3)L⊗U(1)X gauge model where right-handed neutrinos are a natural component of leptonic chiral scalar supermultiplets. We first consider the issue of a 125 GeV Higgs boson mass in this model, showing that constraints on the stop mass and trilinear soft coupling are considerably alleviated compared to the minimal supersymmetric standard model. Then, we investigate the region of parameter space that is consistent with right-handed sneutrino as thermal cold dark matter, under the light of Planck results on the relic abundance and direct detection from the LUX experiment. This sneutrino mainly annihilates through an extra neutral gauge boson, Z′, and Higgs exchange so that the physics of dark matter is somewhat related to the parameters determining Higgs and Z′ masses. We then obtain that the right-handed sneutrino in this model must be heavier than 400 GeV to conform with Planck and LUX, simultaneously constraining the Z′ mass to be above 2400 GeV, which is in perfect agreement with LHC searches in a nonsupersymmetric version of this model. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
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