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Your search keyword '"Vossen, Anselm"' showing total 7 results
Start Over Author "Vossen, Anselm" Topic high energy physics - experiment (hep-ex)
7 results on '"Vossen, Anselm"'

1. Domain-Adversarial Graph Neural Networks for $Λ$ Hyperon Identification with CLAS12

Author

McEneaney, Matthew and Vossen, Anselm

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

Machine learning methods and in particular Graph Neural Networks (GNNs) have revolutionized many tasks within the high energy physics community. We report on the novel use of GNNs and a domain-adversarial training method to identify $Λ$ hyperon events with the CLAS12 experiment at Jefferson Lab. The GNN method we have developed increases the purity of the $Λ$ yield by a factor of $1.95$ and by $1.82$ using the domain-adversarial training. This work also provides a good benchmark for developing event tagging machine learning methods for the $Λ$ and other channels at CLAS12 and other experiments, such as the planned Electron Ion Collider.

Published
2023
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2. Snowmass White Paper: Belle II physics reach and plans for the next decade and beyond

Author

Aggarwal, Latika, Banerjee, Swagato, Bansal, Sunil, Bernlochner, Florian, Bertemes, Michel, Bhardwaj, Vishal, Bondar, Alexander, Browder, Thomas E., Cao, Lu, Campajola, Marcello, Casarosa, Giulia, Cecchi, Claudia, Cheaib, Racha, Pietro, Giacomo, Di Canto, Angelo, Dorigo, Mirco, Feichtinger, Paul, Ferber, Torben, Fulsom, Bryan, García, Marcela, Gaudino, Giovanni, Gaz, Alessandro, Glazov, Alexander, Granderath, Svenja, Graziani, Enrico, Greenwald, Daniel, Goldenzweig, Pablo, Heredia, Ivan, Hernandez Villanueva, Michel, Higuchi, Takeo, Humair, Thibaud, Iijima, Toru, Inguglia, Gianluca, Ishikawa, Akimasa, Jacobi, Daniel, Junkerkalefeld, Henrik A., Karl, Robert, Lautenbach, Klemens, Lewis, Peter M., Li, Long-Ke, Lacaprara, Stefano, Libby, James, Manoni, Elisa, Martini, Alberto, Merola, Mario, Milesi, Marco, Moneta, Stefano, Nayak, Minakshi, Nishida, Shohei, Palaia, Maria Antonietta, Pham, Francis, Polat, Léonard, Prell, Soeren A., Prencipe, Elisabetta, Räuber, Géraldine, Ripp-Baudot, Isabelle, Rhorken, Markus, Roney, Michael, Rostomyan, Armine, Sakai, Yoshihide, Sato, Yo, Schwanda, Christoph, Schwartz, Alan J., Serrano, Justine, Sutcliffe, William, Svidras, Henrikas, Tackmann, Kerstin, Tamponi, Umberto, Tenchini, Francesco, Trabelsi, Karim, Tiwary, Rahul, Tonelli, Diego, Uno, Kenta, Vossen, Anselm, Bruce Yabsley, Yin, Jun-Hao, and Zani, Laura

Subjects
High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, High Energy Physics::Experiment, High Energy Physics - Experiment
Abstract

Belle II is an experiment operating at the intensity frontier. Over the next decades, it will record the decay of billions of bottom mesons, charm hadrons, and tau leptons produced in 10 GeV electron-positron collisions at the SuperKEKB high-luminosity collider at KEK. These data, collected in low-background and kinematically known conditions, will allow us to measure hundreds of parameters that test the standard model (SM) and probe for the existence of new particles, at mass scales orders of magnitudes higher than those studied at the energy frontier. We project our sensitivities for measurements that are of primary relevance and where Belle II will be unique or world leading for data corresponding to 1 to 50 ab$^{-1}$. Belle II will uniquely probe non-SM contributions in sensitive $b \to q\bar q s$ decays and charmless $b \to q\bar q d(u)$ decays, semileptonic $b \to s \nu \bar\nu$ and $s \tau^+ \tau^-$ decays, fully leptonic $b \to \ell \nu$ decays, and select $c \to u$ processes. Belle II will lead exploration of non-SM physics in $b \to c \tau \nu$ and $b \to s \gamma$ decays and will most precisely determine the quark-mixing parameters $|V_{ub}|$ and $|V_{cb}|$. Belle II will measure many parameters in $\tau$ physics to precisions that will be world leading for the foreseeable future, including the electric and magnetic dipole moments, branching fractions for charged-lepton-flavor-violating decays, and quantities that test lepton-flavor universality. Belle II will perform unique searches for dark-sector particles with masses in the MeV-GeV range. We will also pursue a broad spectroscopy program for conventional and multiquark $c \bar c$ and $b \bar b$ states and provide essential inputs to sharpen the interpretation of muon magnetic-anomaly results. Our exploration of uncharted regions of non-SM parameter space with high precision will reveal non-SM particles or set stringent constraints on their existence, guiding future endeavors., Comment: 49 pages, 15 figures. Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021)

Published
2022

3. Reconstruction of event kinematics in semi-inclusive deep-inelastic scattering using the hadronic final state and Machine Learning

Author

Pecar, Connor and Vossen, Anselm

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

Semi-inclusive deep-inelastic scattering (SIDIS) at the Electron-Ion Collider will allow for precise mapping of the 3D momentum and spin structure of nucleons and nuclei over a large kinematic region. In this contribution, we demonstrate methods utilizing the hadronic final state and scattered electron, as well as machine learning, to more reliably reconstruct the virtual photon four momentum and SIDIS kinematics across the inclusive DIS coverage at the EIC.

Published
2022
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4. Probing Nucleons and Nuclei in High Energy Collisions

Author

Aidala, Christine A., Aschenauer, Elke, Aslan, Fatma, Bacchetta, Alessandro, Balitsky, Ian, Benic, Sanjin, Bhattacharya, Shohini, Boglione, Mariaelena, Burkardt, Matthias, Cammarota, Justin, Chirilli, Giovanni A., Cocuzza, Christopher, Courtoy, Aurore, de Florian, Daniel, Di Nezza, Pasquale, Dumitru, Adrian, Fucini, Sara, Fukushima, Kenji, Furletova, Yulia, Gamberg, Leonard, Garcia-Montero, Oscar, Gelis, Fran��ois, Guzey, Vadim, Hatta, Yoshitaka, Hautmann, Francesco, Hobbs, Timothy J., Horn, Tanja, Iancu, Edmond, Joosten, Sylvester, Kang, Zhong-Bo, Kishore, Raj, Kovchegov, Yuri V., Kroll, Peter, Kumeri��ki, Kre��imir, Kutak, Krzysztof, Lappi, Tuomas, Lin, Huey-Wen, Liu, Xiaohui, Liuti, Simonetta, Lorc��, C��dric, M��ntysaari, Heikki, Marquet, Cyrille, Makris, Yiannis, Mamo, Kiminad A., Mehtar-Tani, Yacine, Metz, Andreas, Meziani, Zein-Eddine, Miller, Gerald A., Miller, Joshua, Mukherjee, Asmita, Nadolsky, Pavel M., Olness, Fredrick I., Pasquini, Barbara, Pire, Bernard, Pisano, Cristian, Pitonyak, Daniel, Polyakov, Maxim V., Prokudin, Alexei, Qiu, Jian-Wei, Radici, Marco, Rajan, Abha, Rajesh, Sangem, Rinaldi, Matteo, Roy, Kaushik, Royon, Christophe, Sato, Nobuo, Schlegel, Marc, Schnell, Gunar, Schweitzer, Peter, Scopetta, Sergio, Seidl, Ralf, Semenov-Tian-Shansky, Kirill, Signori, Andrea, Sokhan, Daria, Stasto, Anna M., Szymanowski, Lech, Tarasov, Andrey, Triantafyllopoulos, Dionysios, Ullrich, Thomas, Venugopalan, Raju, Vitev, Ivan, Vogelsang, Werner, Vossen, Anselm, Wang, Bo-Ting, Wallon, Samuel, Watanabe, Kazuhiro, Weiss, Christian, Xiao, Bo-Wen, Yee, Ho-Ung, and Zhao, Yong

Subjects
Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

This volume is a collection of contributions for the 7-week program "Probing Nucleons and Nuclei in High Energy Collisions" that was held at the Institute for Nuclear Theory in Seattle, WA, USA, from October 1 until November 16, 2018. The program was dedicated to the physics of the Electron Ion Collider (EIC), the world's first polarized electron-nucleon (ep) and electron-nucleus (eA) collider to be constructed in the USA. These proceedings are organized by chapters, corresponding to the weeks of the program: Week I, Generalized parton distributions; Week II, Transverse spin and TMDs; Week III, Longitudinal spin; Week IV, Symposium week; Weeks V & VI, eA collisions; Week VII, pA and AA collisions. We hope these proceedings will be useful to readers as a compilation of EIC-related science at the end of the second decade of the XXI century., Electron Ion Collider, INT 18-3 Program. Published by World Scientific. Duplicates content of arXiv:1912.10965, arXiv:1912.10724, arXiv:1910.03006, arXiv:1910.07982, arXiv:1912.13397, arXiv:1910.01979, arXiv:2001.07862, arXiv:2001.03700, arXiv:1910.01030, arXiv:1910.01273, arXiv:1912.13020, arXiv:1910.06003, arXiv:2001.03655, arXiv:1909.12591, arXiv:1909.09809, arXiv:1910.04806, arXiv:2001.05978

Published
2020

5. First Measurement of the Interference Fragmentation Function in $e^+e^-$ at Belle

Author

Vossen, Anselm, Seidl, Ralf, Grosse-Perdekamp, Matthias, Leitgab, Martin, Ogawa, Akio, and Boyle, Kieran

Subjects
High Energy Physics - Experiment (hep-ex), High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment, High Energy Physics - Experiment
Abstract

A first measurement of the di-hadron interference fragmentation function of light quarks in pion pairs with the Belle detector is presented. The chiral odd nature of this fragmentation function allows the use as a quark polarimeter sensitive to the transverse polarization of the fragmenting quark. Therefore it can be used together with data taken at fixed target and collider experiments to extract the quark transversity distribution. A sample consisting of $711 \times 10^6$ di-hadron pairs was extracted from 661 $fb^{-1}$ of data recorded near the $\Upsilon(4S)$ resonance delivered by the KEKB $e^+$$e^{-}$ collider., Comment: Results presented at the "XIII Workshop on High Energy Spin Physics, DSPIN 09" - 9 pages, 3 figures, corrected typo in formula (2)

Published
2009

6. Longitudinal Double-Spin Asymmetries for Dijet Production at Intermediate Pseudorapidity in Polarized $pp$ Collisions at $\sqrt{s}$ = 200 GeV

Author

Adam, Jaroslav, Leszek Adamczyk, Adams, Joseph, Adkins, Kevin, Agakishiev, Geydar, Aggarwal, Madan, Ahammed, Zubayer, Ajitanand, Nuggehalli, Alekseev, Igor, Anderson, Derek, Aoyama, Ryo, Aparin, Alexey, Arkhipkin, Dmitry, Aschenauer, Elke-Caroline, Ashraf, Muhammad Usman, Atetalla, Fareha, Attri, Anjali, Averichev, Georgy, Bai, Xiaozhi, Bairathi, Vipul, Barish, Kenneth, Bassill, Aj, Behera, Arabinda, Bellwied, Rene, Bhasin, Anju, Bhati, Ashok, Bielcik, Jaroslav, Bielcikova, Jana, Bland, Leslie, Bordyuzhin, Igor, Brandenburg, James, Brandin, Andrei, Brown, Daniel, Bryslawskyj, Jason, Bunzarov, Ivan, Butterworth, Joseph, Caines, Helen, Calderon La Barca Sanchez, Manuel, Campbell, John, Cebra, Daniel, Chakaberia, Irakli, Chaloupka, Petr, Chang, Feng-Han, Chang, Zilong, Chankova-Bunzarova, Nedialka, Chatterjee, Arghya, Chattopadhyay, Subhasis, Chen, Jinhui, Chen, Xiaolong, Chen, Xurong, Cheng, Jianping, Cherney, Mike, Christie, Bill, Contin, Giacomo, Crawford, Hank, Das, Sabita, Dedovich, Tatiana, Deppner, Ingo, Derevschikov, Anatoly, Didenko, Lidia, Dilks, Christopher, Dong, Xin, Drachenberg, James, Dunlop, James, Efimov, Leonid, Elsey, Nicholas, Engelage, Jack, Eppley, Geary, Esha, Roli, Esumi, Shinichi, Evdokimov, Olga, Ewigleben, Justin, Eyser, Oleg, Fatemi, Renee, Fazio, Salvatore, Federic, Pavol, Federicova, Pavla, Fedorisin, Jan, Filip, Peter, Finch, Evan, Fisyak, Yuri, Flores, Chris, Fulek, Lukasz, Gagliardi, Carl, Galatyuk, Tatyana, Geurts, Frank, Gibson, Adam, Grosnick, David, Gunarathne, Devika, Guo, Yi, Gupta, Anik, Guryn, Wlodek, Hamad, Ayman, Hamed, Ahmed, Harlenderova, Alena, Harris, John, He, Liang, Heppelmann, Steven, Heppelmann, Samuel, Herrmann, Norbert, Hirsch, Andy, Holub, Lukas, Horvat, Stephen, Huang, Xinjie, Huang, Bingchu, Huang, Shengli, Huang, Huan, Huang, Te-Chuan, Humanic, Tom, Huo, Peng, Igo, George, Jacobs, William, Jentsch, Alexander, Jia, Jiangyong, Jiang, Kun, Jowzaee, Sedigheh, Judd, Eleanor, Kabana, Sonya, Kalinkin, Dmitry, Kang, Kejun, Kapukchyan, David, Kauder, Kolja, Ke, Hongwei, Keane, Declan, Kechechyan, Armen, Kikola, Daniel, Kim, Chong, Kinghorn, Todd, Kisel, Ivan, Kisiel, Adam, Kochenda, Leonid, Kosarzewski, Leszek, Kraishan, Amani, Kramarik, Lukas, Krauth, Luke, Kravtsov, Peter, Krueger, Keith, Kulathunga, Nalinda, Kumar, Sumit, Kumar, Lokesh, Kvapil, Jakub, Kwasizur, Joseph, Lacey, Roy, Landgraf, Jeffery, Lauret, Jerome, Lebedev, Alexei, Lednicky, Richard, Lee, Jeong-Hun, Li, Xin, Li, Cheng, Li, Wei, Li, Yuanjing, Liang, Yue, Lidrych, Jindrich, Lin, Ting, Lipiec, Andrzej, Lisa, Mike, Liu, Feng, Liu, Peifeng, Liu, Huanzhao, Liu, Yanfang, Ljubicic, Tonko, Llope, Wj, Lomnitz, Michael, Longacre, Ron, Luo, Xiaofeng, Luo, Siwei, Ma, Guo-Liang, Ma, Yu-Gang, Ma, Long, Ma, Rongrong, Magdy Abdelwahab Abdelrahman, Niseem, Majka, Richard, Mallick, Debasish, Margetis, Spiros, Markert, Christina, Matis, Howard, Matonoha, Oliver, Mayes, David, Mazer, Joel, Meehan, Kathryn, Mei, Jincheng, Minaev, Nikolai, Mioduszewski, Saskia, Mishra, Debadeepti, Mohanty, Bedanga, Mondal, Mriganka, Mooney, Isaac, Morozov, Dmitry, Nasim, Md, Negrete, Jesus, Nelson, John, Nemes, Daniel, Nie, Maowu, Nigmatkulov, Grigory, Niida, Takafumi, Nogach, Larisa, Nonaka, Toshihiro, Nurushev, Sandibek, Odyniec, Grazyna, Ogawa, Akio, Oh, Kunsu, Oh, Saehanseul, Okorokov, Vitalii, Olvitt Jr, Daniel, Page, Brian, Pak, Robert, Panebratsev, Yuri, Pawlik, Bogdan, Pei, Hua, Perkins, Chris, Pluta, Jan, Porter, Jeff, Posik, Matthew, Pruthi, Navneet Kumar, Przybycien, Mariusz, Putschke, Joern, Quintero, Amilkar, Radhakrishnan, Sooraj, Ramachandran, Suvarna, Ray, Lanny, Reed, Rosi, Ritter, Hans Georg, Roberts, Jay, Rogachevskiy, Oleg, Romero, Juan, Ruan, Lijuan, Rusnak, Jan, Rusnakova, Olga, Sahoo, Nihar, Sahu, Pradip Kumar, Salur, Sevil, Sandweiss, Jack, Schambach, Joachim, Schmah, Alexander, Schmidke, Bill, Schmitz, Norbert, Schweid, Benjamin, Seck, Florian, Seger, Janet, Sergeeva, Maria, Seto, Richard, Seyboth, Peter, Shah, Neha, Shahaliev, Ehtiram, Shanmuganathan, Prashanth, Shao, Ming, Shen, Wen-Qing, Shen, Fuwang, Shi, Shusu, Shou, Qi-Ye, Sichtermann, Ernst, Siejka, Sebastian, Sikora, Rafal, Simko, Miroslav, Singha, Subhash, Smirnov, Nikolai, Smirnov, Dmitri, Solyst, William, Sorensen, Paul, Spinka, Hal, Srivastava, Brijesh, Stanislaus, Shirvel, Stewart, David, Strikhanov, Mikhail, Stringfellow, Blair, Suaide, Alexandre Alarcon, Sugiura, Tetsuro, Sumbera, Michal, Summa, Branden, Sun, Yongjie, Sun, Xu, Sun, Xiangming, Surrow, Bernd, Svirida, Dmitry, Szymanski, Pawel, Tang, Zebo, Tang, Aihong, Taranenko, Arkadiy, Tarnowsky, Terry, Thomas, Jim, Timmins, Anthony, Tlusty, David, Todoroki, Takahito, Tokarev, Michael, Tomkiel, Catherine, Trentalange, Steven, Tribble, Robert, Tribedy, Prithwish, Tripathy, Srikanta Kumar, Tsai, Oleg, Tu, Biao, Ullrich, Thomas, Underwood, Dave, Upsal, Isaac, Buren, Gene, Vanek, Jan, Vasiliev, Alexander, Vassiliev, Iouri, Videbaek, Flemming, Vokal, Stanislav, Voloshin, Sergei, Vossen, Anselm, Wang, Gang, Wang, Yaping, Wang, Fuqiang, Wang, Yi, Webb, Jason, Wen, Liwen, Westfall, Gary, Wieman, Howard, Wissink, Scott, Witt, Richard, Wu, Yang, Xiao, Zhigang, Xie, Guannan, Xie, Wei, Xu, Qinghua, Xu, Zhangbu, Xu, Ji, Xu, Yi-Fei, Xu, Nu, Yang, Shuai, Yang, Chi, Yang, Qian, Yang, Yi, Ye, Zhenyu, Ye, Zaochen, Yi, Li, Yip, Kin, Yoo, In-Kwon, Yu, Ning, Zbroszczyk, Hanna, Zha, Wangmei, Zhang, Zhengqiao, Zhang, Liang, Zhang, Yifei, Zhang, Xiaoping, Zhang, Jinlong, Zhang, Song, Zhang, Shenghui, Zhao, Jie, Zhong, Chen, Zhou, Chensheng, Zhou, Long, Zhu, Zhanwen, Zhu, Xianglei, and Zyzak, Maksym

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

We present the first measurements of the longitudinal double-spin asymmetry $A_{LL}$ for dijets with at least one jet reconstructed within the pseudorapidity range $0.8 < \eta < 1.8$. The dijets were measured in polarized $pp$ collisions at a center-of-mass energy $\sqrt{s}$ = 200 GeV. Values for $A_{LL}$ are determined for several distinct event topologies, defined by the jet pseudorapidities, and span a range of parton momentum fraction $x$ down to $x \sim$ 0.01. The measured asymmetries are found to be consistent with the predictions of global analyses that incorporate the results of previous RHIC measurements. They will provide new constraints on $\Delta g(x)$ in this poorly constrained region when included in future global analyses.

7. The RHIC Spin Program: Achievements and Future Opportunities

Author

Aschenauer, E. C., Bazilevsky, A., Boyle, K., Eyser, K. O., Fatemi, R., Gagliardi, C., Grosse-Perdekamp, M., Lajoie, John, Kang, Zhongbo, Kovchegov, Yuri, Koster, John, Nakagawa, Itaru, Sassot, Rodolfo, Seidl, Ralf, Sichtermann, Ernst, Stratmann, Marco, Vogelsang, Werner, Vossen, Anselm, Wissink, Scott W., and Feng Yuan

Subjects
High Energy Physics - Experiment (hep-ex), hep-ex, High Energy Physics::Phenomenology, Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), nucl-ex, Nuclear Experiment, High Energy Physics - Experiment
Abstract

This document summarizes recent achievements of the RHIC spin program and their impact on our understanding of the nucleon's spin structure, i.e. the individual parton (quark and gluon) contributions to the helicity structure of the nucleon and to understand the origin of the transverse spin phenomena. Open questions are identified and a suite of future measurements with polarized beams at RHIC to address them is laid out. Machine and detector requirements and upgrades are briefly discussed.

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