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1. Revealing the structure of light pseudoscalar mesons at the Electron-Ion Collider

Author

Arrington, John, Gayoso, Carlos Ayerbe, Barry, Patrick C, Berdnikov, Vladimir, Binosi, Daniele, Chang, Lei, Diefenthaler, Markus, Ding, Minghui, Ent, Rolf, Frederico, Tobias, Furletova, Yulia, Hobbs, Tim J, Horn, Tanja, Huber, Garth M, Kay, Stephen JD, Keppel, Cynthia, Lin, Huy-Wen, Mezrag, Cedric, Montgomery, Rachel, Pegg, Ian L, Raya, Khepani, Reimer, Paul, Richards, David G, Roberts, Craig D, Rodriguez-Quintero, Jose, Romanov, Dmitry, Salme, Giovanni, Sato, Nobuo, Segovia, Jorge, Stepanov, Petr, Tadepalli, Arun S, and Trotta, Richard L

Subjects
Nuclear Experiment, High Energy Physics - Phenomenology, Nuclear Theory
Abstract

How the bulk of the Universe's visible mass emerges and how it is manifest in the existence and properties of hadrons are profound questions that probe into the heart of strongly interacting matter. Paradoxically, the lightest pseudoscalar mesons appear to be the key to the further understanding of the emergent mass and structure mechanisms. These mesons, namely the pion and kaon, are the Nambu-Goldstone boson modes of QCD. Unravelling their partonic structure and the interplay between emergent and Higgs-boson mass mechanisms is a common goal of three interdependent approaches -- continuum QCD phenomenology, lattice-regularised QCD, and the global analysis of parton distributions -- linked to experimental measurements of hadron structure. Experimentally, the foreseen electron-ion collider will enable a revolution in our ability to study pion and kaon structure, accessed by scattering from the "meson cloud" of the proton through the Sullivan process. With the goal of enabling a suite of measurements that can address these questions, we examine key reactions to identify the critical detector system requirements needed to map tagged pion and kaon cross sections over a wide range of kinematics. The excellent prospects for extracting pion structure function and form factor data are shown, and similar prospects for kaon structure are discussed in the context of a worldwide programme. Successful completion of the programme outlined herein will deliver deep, far-reaching insights into the emergence of pions and kaons, their properties, and their role as QCD's Goldstone boson modes., Comment: 73 pages, 27 figures

Published
2021
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2. Dark Sectors 2016 Workshop: Community Report

Author

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

Subjects
High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Experiment, Nuclear Experiment
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., Comment: 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

Published
2016

5. Light anti-quark flavor asymmetry in the nucleon sea and the nuclear dependence of anti-quarks in nuclei at the SeaQuest Experiment

Author

Tadepalli, Arun S.

Abstract

Fermilab E906/SeaQuest is an experiment aimed at studying the anti-quark distributions of nucleons and nuclei. The experiment uses a 120 GeV/c proton beam extracted from the Main Injector at Fermilab to collide with various solid and cryogenic targets to study a variety of physics topics. The experiment takes advantage of the Drell-Yan process in order to probe specifically the high-x anti-quark distributions of the target nucleus. The acceptance of the spectrometer is tuned to explore the unprecedentedly high Bjorken-x region, thereby extending our knowledge of the anti-quark sea structure of nucleons and nuclei. A new Intensity-Extrapolation method was developed to counter the rate dependence challenge at SeaQuest. Using this method, the ratio of cross sections of liquid deuterium and liquid hydrogen, σpd(x)/2σpp(x), was measured in the range0.1≤xT≤0.45. The results have been found to be consistently above 1 for all values of the measured range of xT. Also, a first look at ̄d(x)/ ̄u(x) is presented. The trend of the data points indicate that the ratio is consistently above 1 for the measured range of xT. These results (when combined with more data) will provide a key input in constraining many theoretical models that attempt to explain the origin of the nucleon sea. Using the same method, the nuclear dependence of the per-nucleon cross section ratio, RpA, of carbon, iron and tungsten versus deuterium studied as a function of xT, pT, and xF are reported. The results for xT are consistent with E772 indicating little nuclear dependence. A striking A (atomic mass) dependence in which there is a depletion of low-pT dimuons and an excess of high-pT dimuons relative to deuterium is reported. Also, an A dependence for the drop in RpA(xF) for increasing xF is presented. An analysis with and without the cut xT>0.16 (which removes the effects of the shadowing) gives consistent results indicating that the effects of shadowing are small. These results (when combined with more data) will address important questions on the modification of anti-quark distributions in nuclei and in modeling energy loss for partons traversing a cold nuclear medium.

Published
2019
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6. 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

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