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11 results on '"Christopher, Hearty"'

1. Forecasting dark showers at Belle II

Author

Elias Bernreuther, Kai Böse, Torben Ferber, Christopher Hearty, Felix Kahlhoefer, Alessandro Morandini, and Kai Schmidt-Hoberg

Subjects
Dark Matter at Colliders, New Light Particles, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at e + e − colliders. In this work, we study the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator. We show that a prospective search for displaced vertices from GeV-scale long-lived particles at Belle II can improve the sensitivity to dark showers substantially compared to an existing search at BaBar. We compare the sensitivity of searches for displaced signals to searches for promptly produced resonances at BaBar and KLOE and calculate sensitivity projections for a single-photon search at Belle II to invisible dark showers produced through an effective interaction. The underlying structure of the effective interaction can be resolved at higher-energy experiments, where the mediator can be produced on-shell. To study the resulting constraints, we update electroweak precision bounds on kinetically mixed Z′ bosons and reinterpret a search for low-mass di-muon resonances at LHCb in terms of dark showers. We find that LHCb and Belle II are most sensitive to different particle decay lengths, underscoring the complementarity of LHC and intensity frontier experiments.

Published
2022
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2. Long-lived dark Higgs and inelastic dark matter at Belle II

Author

Michael Duerr, Torben Ferber, Camilo Garcia-Cely, Christopher Hearty, and Kai Schmidt-Hoberg

Subjects
Dark matter, Beyond Standard Model, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Inelastic dark matter is an interesting scenario for light thermal dark matter which is fully consistent with all cosmological probes as well as direct and indirect dark matter detection. The required mass splitting between dark matter χ 1 and its heavier twin χ 2 is naturally induced by a dark Higgs field which also provides a simple mechanism to give mass to the dark photon A′ present in the setup. The corresponding dark Higgs boson h′ is naturally the lightest dark sector state and therefore decays into Standard Model particles via Higgs mixing. In this work we study signatures with displaced vertices and missing momentum at Belle II, arising from dark Higgs particles produced in association with dark matter. We find that Belle II can be very sensitive to this scenario, in particular if a displaced vertex trigger is available in the near future.

Published
2021
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3. Photon Reconstruction in the Belle II Calorimeter Using Graph Neural Networks.

Author

Florian Wemmer, Isabel Haide, Jonas Eppelt, Torben Ferber, Alexandre Beaubien, Paolo Branchini, Marcello Campajola, Claudia Cecchi, Priyanka Cheema, Guglielmo De Nardo, Christopher Hearty, Alexander Kuzmin, Savino Longo, Elisa Manoni, Frank Meier, Mario Merola, Kenkichi Miyabayashi, Stefano Moneta, Mikhail Remnev, John Michael Roney, Jing-Ge Shiu, Boris Shwartz, Yuuji Unno, Raynette van Tonder, and Roberta Volpe

Published
2023
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4. Erratum to: Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

Author

Matthew J. Dolan, Torben Ferber, Christopher Hearty, Felix Kahlhoefer, and Kai Schmidt-Hoberg

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

A mistake has been found in the numerical code used to reproduce the bounds from proton beam dump experiments from ref. [1] in figures 2 and 7 of ref. [2]. Correcting this mistake leads to slightly stronger bounds as shown below. We note that this correction does not include recent improvements in the analysis of proton beam dump experiments [3]. Additional recent bounds on GeV-scale ALPs can be found in refs. [4–8].

Published
2021
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5. Invisible and displaced dark matter signatures at Belle II

Author

Michael Duerr, Torben Ferber, Christopher Hearty, Felix Kahlhoefer, Kai Schmidt-Hoberg, and Patrick Tunney

Subjects
Beyond Standard Model, Cosmology of Theories beyond the SM, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Many dark matter models generically predict invisible and displaced signatures at Belle II, but even striking events may be missed by the currently implemented search programme because of inefficient trigger algorithms. Of particular interest are final states with a single photon accompanied by missing energy and a displaced pair of electrons, muons, or hadrons. We argue that a displaced vertex trigger will be essential to achieve optimal sensitivity at Belle II. To illustrate this point, we study a simple but well-motivated model of thermal inelastic dark matter in which this signature naturally occurs and show that otherwise inaccessible regions of parameter space can be tested with such a search. We also evaluate the sensitivity of single-photon searches at BaBar and Belle II to this model and provide detailed calculations of the relic density target.

Published
2020
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6. Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

Author

Matthew J. Dolan, Torben Ferber, Christopher Hearty, Felix Kahlhoefer, and Kai Schmidt-Hoberg

Subjects
Beyond Standard Model, Cosmology of Theories beyond the SM, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Light pseudoscalars interacting pre-dominantly with Standard Model gauge bosons (so-called axion-like particles or ALPs) occur frequently in extensions of the Standard Model. In this work we review and update existing constraints on ALPs in the keV to GeV mass region from colliders, beam dump experiments and astrophysics. We furthermore provide a detailed calculation of the expected sensitivity of Belle II, which can search for visibly and invisibly decaying ALPs, as well as long-lived ALPs. The Belle II sensitivity is found to be substantially better than previously estimated, covering wide ranges of relevant parameter space. In particular, Belle II can explore an interesting class of dark matter models, in which ALPs mediate the interactions between the Standard Model and dark matter. In these models, the relic abundance can be set via resonant freeze-out, leading to a highly predictive scenario consistent with all existing constraints but testable with single-photon searches at Belle II in the near future.

Published
2017
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7. Searches for dark photons at accelerators

Author

Christopher Hearty

Subjects
History, Computer Science Applications, Education
Abstract

Dark sector models attempt to describe observed dark matter properties, as well as other anomalies such as muon (g − 2), possible violations of lepton universality in B decay, and the possible observation of a new particle by the ATOMKI experiment. There is an extensive program of operating and proposed experiments to search for the new, low-mass, feebly-interacting particles predicted by such theories. I will focus on current searches at accelerators for dark photons, a component of many dark sector models. The results are interpreted in a basic model containing dark photons and dark matter.

Published
2022
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8. Evidence for B{sup +} {yields} J/{psi} p{bar {Lambda}} and search for B{sup 0} {yields} J/{psi} p{bar p}

Author

Christopher Hearty

Subjects
Physics, Particle decay, Crystallography, Branching fraction, Center (category theory), Atomic physics, Lambda, Bar (unit)
Abstract

We have performed a search for the decays B{sup +} {yields} J/{psi}p{bar {Lambda}} and B{sup 0} {yields} J/{psi}p{bar p} in a data set of (88.9 {+-} 1.0) x 10{sup 6} {Upsilon}(4S) decays collected by the BABAR experiment at the PEP-II e{sup +}e{sup -} storage ring at the Stanford Linear Accelerator Center. Four charged B candidates have been observed with an expected background of 0.21 {+-} 0.14 events. The corresponding branching fraction is (12{sub -6}{sup +9} x 10{sup -6}), where statistical and systematic uncertainties have been combined. The result can be interpreted as a 90% confidence level (CL) upper limit of 26 x 10{sup -6}. We also find one B{sup 0} candidate, with an expected background of 0.64 {+-} 0.17 events, implying a 90% CL upper limit of 1.9 x 10{sup -6}.

Published
2003
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9. The Physics Program and Status of the SLAC B-Factory and Detector

Author

Christopher Hearty

Subjects
Physics, Nuclear physics, Particle physics, Physics::Instrumentation and Detectors, law, Detector, Measure (physics), Physics::Accelerator Physics, CP violation, High Energy Physics::Experiment, Collider, B-factory, law.invention
Abstract

The goal of the SLAC B‐Factory is to measure CP violation in the decay of B‐mesons and to test the standard model description of CP violation. Work is now underway in upgrading the PEP collider for this project, and much of the preliminary detector design has been done. The physics goals and design of PEP‐II are briefly discussed, and the current plans for the detector are outlined.

Published
1994

10. Dark Sectors 2016 Workshop: Community Report

Author

Jim Alexander, Jim, Alexander, Marco, Battaglieri, Bertrand, Echenard, Rouven, Essig, Matthew, Graham, Eder, Izaguirre, John, Jaros, Gordan, Krnjaic, Jeremy, Mardon, David, Morrissey, Tim, Nelson, Maxim, Perelstein, Matt, Pyle, Adam, Ritz, Philip, Schuster, Brian, Shuve, Natalia, Toro, Richard, G. Water, Daniel, Akerib, Haipeng, An, Konrad, Aniol, Arnquist, Isaac J., Asner, David M., Back, Henning O., Keith, Baker, Nathan, Baltzell, Dipanwita, Banerjee, Brian, Batell, Daniel, Bauer, James, Beacham, Jay, Benesch, James, Bjorken, Nikita, Blinov, Celine, Boehm, Mariangela, Bondí, Walter, Bonivento, Fabio, Bossi, Brodsky, Stanley J., Ran, Budnik, Stephen, Bueltmann, Bukhari, Masroor H., Raymond, Bunker, Massimo, Carpinelli, Concetta, Cartaro, David, Cassel, Gianluca Cavoto, Andrea, Celentano, Animesh, Chaterjee, Saptarshi, Chaudhuri, Gabriele, Chiodini, Hsiao-Mei Sherry Cho, Church, Eric D., Cooke, D. A., Jodi, Cooley, Robert, Cooper, Ross, Corliss, Paolo, Crivelli, Francesca, Curciarello, Annalisa, D. Angelo, Hooman, Davoudiasl, Marzio De Napoli, Vita, Raffaella, Achim, Denig, Patrick, Deniverville, Abhay, Deshpande, Ranjan, Dharmapalan, Bogdan, Dobrescu, Sergey, Donskov, Raphael, Dupre, Juan, Estrada, Stuart, Fegan, Torben, Ferber, Clive, Field, Enectali, Figueroa-Feliciano, Alessandra, Filippi, Bartosz, Fornal, Arne, Freyberger, Alexander, Friedland, Iftach, Galon, Susan, Gardner, Francois-Xavier, Girod, Sergei, Gninenko, Andrey, Golutvin, Stefania, Gori, Christoph, Grab, Enrico, Graziani, Keith, Griffioen, Andrew, Haas, Keisuke, Harigaya, Christopher, Hearty, Scott, Hertel, Joanne, Hewett, Andrew, Hime, David, Hitlin, Yonit, Hochberg, Holt, Roy J., Maurik, Holtrop, Hoppe, Eric W., Hossbach, Todd W., Lauren, Hsu, Phil, Ilten, Joe, Incandela, Gianluca, Inguglia, Kent, Irwin, Igal, Jaegle, Johnson, Robert P., Yonatan, Kahn, Grzegorz, Kalicy, Zhong-Bo, Kang, Vardan, Khachatryan, Venelin, Kozhuharov, Krasnikov, N. V., Valery, Kubarovsky, Eric, Kuflik, Noah, Kurinsky, Ranjan, Laha, Gaia, Lanfranchi, Dale, Li, Tongyan, Lin, Mariangela, Lisanti, Kun, Liu, Ming, Liu, Ben, Loer, Dinesh, Loomba, Lyubovitskij, Valery E., Aaron, Manalaysay, Giuseppe, Mandaglio, Jeremiah, Mans, Marciano, W. J., Thomas, Markiewicz, Luca, Marsicano, Takashi, Maruyama, Matveev, Victor A., David, Mckeen, Bryan, Mckinnon, Dan, Mckinsey, Harald, Merkel, Jeremy, Mock, Maria Elena Monzani, Omar, Moreno, Corina, Nantais, Sebouh, Paul, Peskin, Michael Edward, Vladimir, Poliakov, Antonio Davide Polosa, Maxim, Pospelov, Igor, Rachek, Balint, Radics, Mauro Raggi, Nunzio, Randazzo, Blair, Ratcliff, Alessandro, Rizzo, Thomas, Rizzo, Alan, Robinson, Andre, Rubbia, David, Rubin, Dylan, Rueter, Tarek, Saab, Elena, Santopinto, Richard, Schnee, Jessie, Shelton, Gabriele, Simi, Ani, Simonyan, Valeria, Sipala, Oren, Slone, Elton, Smith, Daniel, Snowden-Ifft, Matthew, Solt, Peter, Sorensen, Yotam, Soreq, Stefania, Spagnolo, James, Spencer, Stepan, Stepanyan, Jan, Strube, Michael, Sullivan, Tadepalli, Arun S., Tim, Tait, Mauro, Taiuti, Philip, Tanedo, Rex, Tayloe, Jesse, Thaler, Tran, Nhan V., Sean, Tulin, Tully, Christopher G., Sho, Uemura, Maurizio, Ungaro, Paolo, Valente, Holly, Vance, Jerry, Vavra, Tomer, Volansky, Belina von Krosigk, Andrew, Whitbeck, Mike, Williams, Peter, Wittich, Bogdan, Wojtsekhowski, Wei, Xue, Jong Min Yoon, Hai-Bo, Yu, Jaehoon, Yu, Tien-Tien, Yu, Yue, Zhang, Yue, Zhao, Yiming, Zhong, and Kathryn, Zurek

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), High Energy Physics - Phenomenology, astro-ph.CO, High Energy Physics - Experiment, Nuclear Experiment, hep-ex, FOS: Physical sciences, hep-ph, nucl-ex, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Nuclear Experiment (nucl-ex), Astrophysics - Cosmology and Nongalactic Astrophysics, Particle Physics - Phenomenology
Abstract

This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years., 66 pages, 15 figures, 3 tables. Workshop website and agenda: http://www-conf.slac.stanford.edu/darksectors2016/ https://indico.cern.ch/event/507783/ Editors: J. Alexander, M. Battaglieri, B. Echenard, R. Essig, M. Graham, E. Izaguirre, J. Jaros, G. Krnjaic, J. Mardon, D. Morrissey, T. Nelson, M. Perelstein, M. Pyle, A. Ritz, P. Schuster, B. Shuve, N. Toro, R. Van De Water

11. US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report

Author

Marco Battaglieri, Marco, Battaglieri, Alberto, Belloni, Aaron, Chou, Priscilla, Cushman, Bertrand, Echenard, Rouven, Essig, Juan, Estrada, Feng, Jonathan L., Brenna, Flaugher, Fox, Patrick J., Peter, Graham, Carter, Hall, Roni, Harnik, Joanne, Hewett, Joseph, Incandela, Eder, Izaguirre, Daniel, Mckinsey, Matthew, Pyle, Natalie, Roe, Gray, Rybka, Pierre, Sikivie, Tait, Tim M. P., Natalia, Toro, Richard Van De Water, Neal, Weiner, Kathryn, Zurek, Eric, Adelberger, Andrei, Afanasev, Derbin, Alexander, James, Alexander, Antochi, Vasile Cristian, David Mark Asner, Howard, Baer, Dipanwita, Banerjee, Baracchini, Elisabetta, Phillip, Barbeau, Joshua, Barrow, Noemie, Bastidon, James, Battat, Stephen, Benson, Asher, Berlin, Mark, Bird, Nikita, Blinov, Boddy, Kimberly K., Mariangela, Bondi, Bonivento, Walter M., Mark, Boulay, James, Boyce, Maxime, Brodeur, Leah, Broussard, Ranny, Budnik, Philip, Bunting, Marc, Caffee, Sabato Stefano Caiazza, Sheldon, Campbell, Tongtong, Cao, Gianpaolo, Carosi, Massimo, Carpinelli, Gianluca Cavoto, Andrea, Celentano, Jae Hyeok Chang, Swapan, Chattopadhyay, Alvaro, Chavarria, Chien-Yi, Chen, Kenneth, Clark, John, Clarke, Owen, Colegrove, Jonathon, Coleman, David, Cooke, Robert, Cooper, Michael, Crisler, Paolo, Crivelli, Francesco, D. Eramo, Domenico, D. Urso, Eric, Dahl, William, Dawson, Marzio De Napoli, Raffaella De Vita, Patrick, Deniverville, Stephen, Derenzo, Antonia Di Crescenzo, Di Marco, Emanuele, Dienes, Keith R., Milind, Diwan, Dongwi Handiipondola Dongwi, Alex, Drlica-Wagner, Sebastian, Ellis, Anthony Chigbo Ezeribe, Glennys, Farrar, Francesc, Ferrer, Enectali, Figueroa-Feliciano, Alessandra, Filippi, Giuliana, Fiorillo, Bartosz, Fornal, Arne, Freyberger, Claudia, Frugiuele, Cristian, Galbiati, Iftah, Galon, Susan, Gardner, Andrew, Geraci, Gilles, Gerbier, Mathew, Graham, Edda, Gschwendtner, Christopher, Hearty, Jaret, Heise, Reyco, Henning, Hill, Richard J., David, Hitlin, Yonit, Hochberg, Jason, Hogan, Maurik, Holtrop, Ziqing, Hong, Todd, Hossbach, Humensky, T. B., Philip, Ilten, Kent, Irwin, John, Jaros, Robert, Johnson, Matthew, Jones, Yonatan, Kahn, Narbe, Kalantarians, Manoj, Kaplinghat, Rakshya, Khatiwada, Simon, Knapen, Michael, Kohl, Chris, Kouvaris, Jonathan, Kozaczuk, Gordan, Krnjaic, Valery, Kubarovsky, Eric, Kuflik, Alexander, Kusenko, Rafael, Lang, Kyle, Leach, Tongyan, Lin, Mariangela, Lisanti, Jing, Liu, Kun, Liu, Ming, Liu, Dinesh, Loomba, Joseph, Lykken, Katherine, Mack, Jeremiah, Mans, Humphrey, Maris, Thomas, Markiewicz, Luca, Marsicano, Martoff, C. J., Giovanni, Mazzitelli, Christopher, Mccabe, Mcdermott, Samuel D., Art, Mcdonald, Bryan, Mckinnon, Dongming, Mei, Tom, Melia, Miller, Gerald A., Kentaro, Miuchi, Sahara Mohammed Prem Nazeer, Omar, Moreno, Vasiliy, Morozov, Frederic, Mouton, Holger, Mueller, Alexander, Murphy, Russell, Neilson, Tim, Nelson, Christopher, Neu, Yuri, Nosochkov, Ciaran, O. Hare, Noah, Oblath, John, Orrell, Jonathan, Ouellet, Saori, Pastore, Sebouh, Paul, Maxim, Perelstein, Annika, Peter, Nguyen, Phan, Nan, Phinney, Michael, Pivovaroff, Andrea, Pocar, Maxim, Pospelov, Josef, Pradler, Paolo, Privitera, Stefano, Profumo, Mauro Raggi, Surjeet, Rajendran, Nunzio, Randazzo, Tor, Raubenheimer, Christian, Regenfus, Andrew, Renshaw, Adam, Ritz, Thomas, Rizzo, Leslie, Rosenberg, Andre, Rubbia, Ben, Rybolt, Tarek, Saab, Safdi, Benjamin R., Elena, Santopinto, Andrew, Scarff, Michael, Schneider, Philip, Schuster, George, Seidel, Hiroyuki, Sekiya, Ilsoo, Seong, Gabriele, Simi, Valeria, Sipala, Tracy, Slatyer, Oren, Slone, Peter, F. Smith, Jordan, Smolinsky, Daniel, Snowden-Ifft, Matthew, Solt, Andrew, Sonnenschein, Peter, Sorensen, Neil, Spooner, Brijesh, Srivastava, Ion, Stancu, Louis, Strigari, Jan, Strube, Sushkov, Alexander O., Matthew, Szydagis, Philip, Tanedo, David, Tanner, Rex, Tayloe, William, Terrano, Jesse, Thaler, Brooks, Thomas, Brianna, Thorpe, Thomas, Thorpe, Javier, Tiffenberg, Nhan, Tran, Marco, Trovato, Christopher, Tully, Tony, Tyson, Tanmay, Vachaspati, Sven, Vahsen, Karl van Bibber, Justin, Vandenbroucke, Anthony, Villano, Tomer, Volansky, Guojian, Wang, Thomas, Ward, William, Wester, Andrew, Whitbeck, Williams, David A., Matthew, Wing, Lindley, Winslow, Bogdan, Wojtsekhowski, Hai-Bo, Yu, Shin-Shan, Yu, Tien-Tien, Yu, Xilin, Zhang, Yue, Zhao, and Yi-Ming, Zhong

Subjects
Astrophysics and Astronomy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), hep-ex, FOS: Physical sciences, hep-ph, High Energy Physics - Phenomenology, astro-ph.CO, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Particle Physics - Experiment, Particle Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in Dark Matter" held at University of Maryland on March 23-25, 2017., Comment: 102 pages + references

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