Results 11 to 20 of about 245,057 (208)

Constraints on heavy dark matter annihilation and decay from electron and positron cosmic ray spectra

SciPost Physics Proceedings, 2023
Annihilation or decay of dark matter (DM) could contribute to the electron and positron cosmic-ray flux, allowing for constraints on DM parameters from its measurement.
Holger Motz
doaj   +1 more source

Detection of the 511 keV Galactic Positron Annihilation Line with COSI [PDF]

Astrophysical Journal, 2019
The signature of positron annihilation, namely the 511 keV γ-ray line, was first detected coming from the direction of the Galactic center in the 1970s, but the source of Galactic positrons still remains a puzzle.
C. Kierans, Steven E. Boggs, A. Zoglauer, A. Lowell, C. Sleator, J. Beechert, T. Brandt, Pierre Jean, Hadar Lazar, J. Roberts, T. Siegert, J. Tomsick, P. Ballmoos   +12 more
semanticscholar   +1 more source

New physics searches at the ILC positron and electron beam dumps

Journal of High Energy Physics, 2021
We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are considered as new physics scenarios ...
Kento Asai, Sho Iwamoto, Yasuhito Sakaki, Daiki Ueda   +3 more
doaj   +1 more source

Constraints on positron annihilation kinematics in the inner Galaxy [PDF]

Astronomy & Astrophysics, 2019
Context. The annihilation of cosmic positrons with electrons in the interstellar medium results in the strongest persistent γ-ray line signal in the sky.
T. Siegert, R. Crocker, R. Diehl, M. Krause, F. Panther, Moritz M. M. Pleintinger, C. Weinberger   +6 more
semanticscholar   +1 more source

Polarization and entanglement in baryon–antibaryon pair production in electron–positron annihilation [PDF]

Nature Physics, 2018
Particles directly produced at electron–positron colliders, such as the J/ψ meson, decay with relatively high probability into a baryon–antibaryon pair1. For spin-1/2 baryons, the pair can have the same or opposite helicites.
B. C. M. Ablikim, M. Achasov, S. Ahmed, M. Albrecht, M. Alekseev, A. Amoroso, F. An, Q. An, Y. Bai, O. Bakina, R. Ferroli, Y. Ban, K. Begzsuren, D. Bennett, J. Bennett, N. Berger, M. Bertani, D. Bettoni, F. Bianchi, E. Boger, I. Boyko, R. Briere, H. Cai, X. Cai, A. Calcaterra, G. Cao, S. Cetin, J. Chai, J. Chang, W. Chang, G. Chelkov, G. Chen, H. Chen, J. Chen, M. Chen, P. Chen, S. Chen, X. Chen, Y. Chen, W. Cheng, X. Chu, G. Cibinetto, F. Cossio, H. Dai, J. Dai, A. Dbeyssi, D. Dedovich, Z. Deng, A. Denig, I. Denysenko, M. Destefanis, F. Mori, Y. Ding, C. Dong, J. Dong, L. Dong, M. Dong, Z. Dou, S. Du, P. Duan, J. Fan, J. Fang, S. Fang, Y. Fang, R. Farinelli, L. Fava, S. Fegan, F. Feldbauer, G. Felici, C. Feng, E. Fioravanti, M. Fritsch, C. Fu, Q. Gao, X. Gao, Y. Gao, Y. Gao, Z. Gao, B. Garillon, I. Garzia, A. Gilman, K. Goetzen, L. Gong, W. Gong, W. Gradl, M. Greco, L. Gu, M. Gu, Y. Gu, A. Guo, L. Guo, R. Guo, Y. Guo, A. Guskov, Z. Haddadi, S. Han, X. Hao, F. Harris, K. He, F. Heinsius, T. Held, Y. Heng, Z. Hou, H. Hu, J. Hu, T. Hu, Y. Hu, G. Huang, J. Huang, X. Huang, X. Huang, Z. Huang, T. Hussain, W. Andersson, M. Irshad, Q. Ji, Q. Ji, X. Ji, X. Ji, H. Jiang, X. Jiang, X. Jiang, J. Jiao, Z. Jiao, D. Jin, S. Jin, Y. Jin, T. Johansson, A. Julin, N. Kalantar-Nayestanaki, X. Kang, M. Kavatsyuk, B. Ke, I. Keshk, T. Khan, A. Khoukaz, P. Kiese, R. Kiuchi, R. Kliemt, L. Koch, O. B. Kolcu, B. Kopf, M. Kornicer, M. Kuemmel, M. Kuessner, A. Kupsc, M. Kurth, W. Kuhn, J. Lange, P. Larin, L. Lavezzi, S. Leiber, H. Leithoff, C. Li, Cheng Li, D. Li, F. Li, F. Li, G. Li, H. Li, H. Li, J. Li, J. Li, K. Li, Kang Li, Kenneth K. Li, Lei Li, P. Li, P. Li, Q. Li, T. Li, W. Li, W. Li, X. Li, X. Li, X. Li, Z. Li, H. Liang, Y. Liang, Y. Liang, G. Liao, L. Liao, J. Libby, C. Lin, D. Lin, B. Liu, B. Liu, C. Liu, D. Liu, D. Liu, F. Liu, F. Liu, Feng. Liu, H. Liu, H. Liu, H. Liu, Huanhuan Liu, Huihui Liu, J. J. Liu, J. Liu, J. Liu, Li-Yu Daisy Liu, Li-Yu Daisy Liu, Li-Yu Daisy Liu, Q. Liu, S. Liu, X. Liu, Y. Liu, Z. Liu, Zhiqing Liu, Y. Long, X. Lou, H. Lu, J. Lu, Y. Lu, Y. Lu, C. Luo, M. Luo, P. Luo, T. Luo, X. Luo, S. Lusso, X. Lyu, F. Ma, H. Ma, L. Ma, M. Ma, Q. Ma, X. Ma, X. Ma, Y. Ma, F. Maas, M. Maggiora, S. Maldaner, Q. A. Malik, A. Mangoni, Y. Mao, Z. Mao, S. Marcello, Z. Meng, J. Messchendorp, G. Mezzadri, J. Min, T. Min, R. Mitchell, X. Mo, Y. Mo, C. Morales, N. Muchnoi, H. Muramatsu, A. Mustafa, S. Nakhoul, Y. Nefedov, F. Nerling, I. Nikolaev, Z. Ning, S. Nisar, S. Niu, X. Niu, S. Olsen, Q. Ouyang, S. Pacetti, Y. Pan, M. Papenbrock, P. Patteri, M. Pelizaeus, J. Pellegrino, H. Peng, Z. Peng, K. Peters, J. Pettersson, J. Ping, R. Ping, A. Pitka, R. Poling, V. Prasad, H. Qi, M. Qi, T. Qi, S. Qian, C. Qiao, N. Qin, X. Qin, Z. Qin, J. Qiu, S. Qu, K. H. Rashid, C. Redmer, M. Richter, M. Ripka, A. Rivetti, M. Rolo, G. Rong, C. Rosner, M. Rump, A. Sarantsev, M. Savri'e, K. Schoenning, W. Shan, X. Shan, M. Shao, C. Shen, P. Shen, X. Shen, H. Sheng, X. Shi, J. Song, W. Song, X. Song, S. Sosio, C. Sowa, S. Spataro, F. Sui, G. Sun, J. Sun, L. Sun, S. Sun, X. Sun, Y. Sun, Y. Sun, Y. Sun, Z. Sun, Z. Sun, Y. Tan, C. Tang, G. Tang, X. Tang, M. Tiemens, B. Tsednee, I. Uman, B. Wang, B. Wang, C. Wang, D. Wang, D. Wang, Dan Wang, H. H. Wang, K. Wang, L. Wang, L. Wang, M. Wang, Meng Wang, P. Wang, P. Wang, W. Wang, X. Wang, Y. Wang, Y. Wang, Z. Wang, Z. Wang, Z. Wang, Zongyuan Wang, T. Weber, D. Wei, P. Weidenkaff, S. Wen, U. Wiedner, M. Wolke, L. Wu, L. Wu, Z. Wu, L. Xia, X. Xia, Y. Xia, D. Xiao, Y. Xiao, Z. Xiao, Y. Xie, Y. Xie, X. Xiong, Q. L. Xiu, G. Xu, J. Xu, L. Xu, Q. Xu, X. Xu, F. Yan, L. Yan, W. Yan, W. Yan, Y. Yan, H. Yang, H. Yang, L. Yang, R. Yang, S. Yang, Y. Yang, Y. Yang, Yifan Yang, Z. Q. Yang, M. Ye, M. Ye, J. Yin, Z. You, B. Yu, C. Yu, J. Yu, C. Yuan, Y. Yuan, A. Yuncu, A. Zafar, Y. Zeng, B. Zhang, B. Zhang, C. Zhang, D. Zhang, H. Zhang, H. Zhang, J. Zhang, J. Zhang, J. Zhang, J. Zhang, J. Zhang, J. Zhang, K. Zhang, L. Zhang, S. Zhang, T. Zhang, X. Zhang, Y. Zhang, Y. Zhang, Y. Zhang, Y. Zhang, Yao Zhang, Yu Zhang, Z. Zhang, Z. Zhang, Z. Zhang, G. Zhao, J. Zhao, J. Zhao, J. Zhao, Lei Zhao, Ling Zhao, M. Zhao, Q. Zhao, S. Zhao, T. Zhao, Y. Zhao, Z. Zhao, A. Zhemchugov, B. Zheng, J. Zheng, W. Zheng, Y. Zheng, B. Zhong, L. Zhou, Q. Zhou, X. Zhou, X. Zhou, X. Zhou, X. Zhou, Xiaoyu Zhou, Xu Zhou, A. Zhu, J. Zhu, K. Zhu, K. Zhu, S. Zhu, S. Zhu, X. Zhu, Y. Zhu, Y. Zhu, Z. Zhu, J. Zhuang, B. Zou, J. Zou   +466 more
semanticscholar   +1 more source

Dark photon production through positron annihilation in beam-dump experiments [PDF]

Physical Review D, 2018
High energy positron annihilation is a viable mechanism to produce dark photons ($A^\prime$). This reaction plays a significant role in beam-dump experiments using experiments using multi-GeV electron-beams on thick targets by enhancing the sensitivity ...
L. Marsicano, P. Valente, M. Bondí, M. Napoli, E. Nardi, A. Celentano, M. Battaglieri, C. D. R. Carvajal, R. Vita, M. Raggi   +9 more
semanticscholar   +1 more source

Myocardial Perfusion Defects in Hypertrophic Cardiomyopathy Mutation Carriers

Journal of the American Heart Association, EarlyView., 2021
Background Impaired myocardial blood flow (MBF) in the absence of epicardial coronary disease is a feature of hypertrophic cardiomyopathy (HCM). Although most evident in hypertrophied or scarred segments, reduced MBF can occur in apparently normal segments.
Rebecca K. Hughes, Claudia Camaioni, João B. Augusto, Kristopher Knott, Ellie Quinn, Gabriella Captur, Andreas Seraphim, George Joy, Petros Syrris, Perry M. Elliott, Saidi Mohiddin, Peter Kellman, Hui Xue, Luis R. Lopes, James C. Moon   +14 more
wiley   +1 more source

Split Ga vacancies and the unusually strong anisotropy of positron annihilation spectra in β−Ga2O3

, 2020
We report a systematic first principles study on positron annihilation parameters in the $\beta$-Ga$_2$O$_3$ lattice and Ga mono-vacancy defects complemented with orientation-dependent experiments of the Doppler broadening of the positron-electron ...
A. Karjalainen, V. Prozheeva, K. Simula, I. Makkonen, V. Callewaert, J. Varley, F. Tuomisto   +6 more
semanticscholar   +1 more source

Positron Binding and Annihilation in Alkane Molecules. [PDF]

Physical Review Letters, 2019
A model-potential approach has been developed to study positron interactions with molecules. Binding energies and annihilation rates are calculated for positron bound states with a range of alkane molecules, including rings and isomers.
A. Swann, G. Gribakin
semanticscholar   +1 more source

A single shot gamma-induced positron spectroscopy based on laser wakefield accelerator

AIP Advances, 2021
Single shot gamma-induced positron annihilation spectroscopy (GiPS) based on a laser wakefield accelerator is proposed. In this spectroscopy, a large number of gamma rays generated by laser-wakefield accelerated electrons are injected into a sample in a ...
Yonghong Yan, Minghai Yu, Shaoyi Wang, Fang Tan, Yue Yang, Xiaohui Zhang, Yuchi Wu, Jingqin Su, Weimin Zhou, Yuqiu Gu   +9 more
doaj   +1 more source