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639 results on '"bhabha scattering"'

1. Precision measurement of the integrated luminosity of the data taken by BESIII at center-of-mass energies between 3.810 GeV and 4.600 GeV**Supported by National Key Basic Research Program of China (2015CB856700), National Natural Science Foundation of China (NSFC) (11125525, 11235011, 11322544, 11335008, 11425524), Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (11179007, U1232201, U1332201) CAS (KJCX2-YW-N29, KJCX2-YW-N45), 100 Talents Program of CAS, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology, German Research Foundation DFG (Collaborative Research Center CRC-1044), Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey (DPT2006K-120470), Russian Foundation for Basic Research (14-07-91152), U.S. Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118), U.S. National Science Foundation, University of Groningen (RuG) and the Helmholtz

Author

Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, precision measurement, luminosity, Bhabha scattering, charmonium, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

From December 2011 to May 2014, about 5 fb-1 of data were taken with the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 GeV to study the charmonium-like states and higher excited charmonium states. The time-integrated luminosity of the collected data sample is measured to a precision of 1% by analyzing events produced by the large-angle Bhabha scattering process.

Published
2015

5. Two-loop Bhabha scattering at high energy beyond leading power approximation

Author

Alexander A. Penin and Nikolai Zerf

Subjects
QED, Perturbation theory, Bhabha scattering, Physics, QC1-999
Abstract

We evaluate the two-loop O(me2/s) contribution to the wide-angle high-energy electron–positron scattering in the double-logarithmic approximation. The origin and the general structure of the power-suppressed double logarithmic corrections are discussed in detail.

Published
2016
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7. The Resonant Effect of an Annihilation Channel in the Interaction of the Ultrarelativistic Electron and Positron in the Field of an X-ray Pulsar

Author

Dmitriy V. Doroshenko, Sergei P. Roshchupkin, and Victor V. Dubov

Subjects
Oleinik resonances, X-ray field, electron, positron, Bhabha scattering, Elementary particle physics, QC793-793.5
Abstract

We investigated the effects that occur during the circulation of ultrarelativistic electrons and positrons in the field of an X-ray pulsar. A resonant process in annihilation and the subsequent production of the electron–positron pairs were studied theoretically. Under the resonance, the second-order process in an original fine-structure constant process effectively decays to two first order processes of the fine-structure constant: single-photon annihilation of the electron–positron pair stimulated by the external field, and the Breit–Wheeler process (single-photon birth of the electron–positron pair) stimulated by the external field. We show that resonance has a threshold energy for a certain combinational energy of the initial electron and positron. Furthermore, there is a definite small angle between initial ultrarelativistic particles’ momenta, in which resonance takes place. Initial and final electron–positron pairs fly in a narrow cone. We noticed that electron (positron) emission angle defines the energy of the final pair. We show that the resonant cross-section in the field of the X-ray pulsar may significantly exceed the corresponding cross-section without the field (Bhabha cross-section).

Published
2020
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11. Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV

Author

BESIII Collaboration, Ablikim, M., Achasov, M. N., Adlarson, P., Albrecht, M., Aliberti, R., Amoroso, A., An, M. R., An, Q., Bai, X. H., Bai, Y., Bakina, O., Ferroli, R. Baldini, Balossino, I., Ban, Y., Batozskaya, V., Becker, D., Begzsuren, K., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Bloms, J., Bortone, A., Boyko, I., Briere, R. A., Brueggemann, A., Cai, H., Cai, X., Calcaterra, A., Cao, G. F., Cao, N., Cetin, S. A., Chang, J. F., Chang, W. L., Chelkov, G., Chen, C., Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, T., Chen, X. R., Chen, X. T., Chen, Y. B., Chen, Z. J., Cheng, W. S., Chu, X., Cibinetto, G., Cossio, F., Cui, J. J., Dai, H. L., Dai, J. P., Dbeyssi, A., de Boer, R. E., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, J., Dong, L. Y., Dong, M. Y., Dong, X., Du, S. X., Egorov, P., Fan, Y. L., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Feldbauer, F., Felici, G., Feng, C. Q., Feng, J. H., Fischer, K, Fritsch, M., Fritzsch, C., Fu, C. D., Gao, H., Gao, Y. N., Gao, Yang, Garbolino, S., Garzia, I., Ge, P. T., Ge, Z. W., Geng, C., Gersabeck, E. M., Gilman, A, Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, L. M., Gu, M. H., Gu, Y. T., Guan, C. Y, Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Guskov, A., Han, T. T., Han, W. Y., Hao, X. Q., Harris, F. A., He, K. K., He, K. L., Heinsius, F. H., Heinz, C. H., Heng, Y. K., Herold, C., Holtmann, T., Hou, G. Y., Hou, Y. R., Hou, Z. L., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, K. X., Huang, L. Q., Huang, X. T., Huang, Y. P., Huang, Z., Hussain, T., Hüsken, N, Imoehl, W., Irshad, M., Jackson, J., Jaeger, S., Janchiv, S., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Ji, Y. Y., Jia, Z. K., Jiang, H. B., Jiang, S. S., Jiang, X. S., Jiang, Y., Jiao, J. B., Jiao, Z., Jin, S., Jin, Y., Jing, M. Q., Johansson, T., Kalantar-Nayestanaki, N., Kang, X. S., Kappert, R., Kavatsyuk, M., Ke, B. C., Keshk, I. K., Khoukaz, A., Kiese, P., Kiuchi, R., Koch, L., Kolcu, O. B., Kopf, B., Kuemmel, M., Kuessner, M., Kupsc, A., Kühn, W., Lane, J. J., Lange, J. S., Larin, P., Lavania, A., Lavezzi, L., Lei, Z. H., Leithoff, H., Lellmann, M., Lenz, T., Li, C., Li, C. H., Li, Cheng, Li, D. M., Li, F., Li, G., Li, H., Li, H. B., Li, H. J., Li, H. N., Li, J. Q., Li, J. S., Li, J. W., Li, Ke, Li, L. J, Li, L. K., Li, Lei, Li, M. H., Li, P. R., Li, S. X., Li, S. Y., Li, T., Li, W. D., Li, W. G., Li, X. H., Li, X. L., Li, Xiaoyu, Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Liao, L. Z., Libby, J., Limphirat, A., Lin, C. X., Lin, D. X., Lin, T., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, G. M., Liu, H., Liu, H. B., Liu, H. M., Liu, Huanhuan, Liu, Huihui, Liu, J. B., Liu, J. L., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L., Liu, M. H., Liu, P. L., Liu, Q., Liu, S. B., Liu, T., Liu, W. K., Liu, W. M., Liu, X., Liu, Y., Liu, Y. B., Liu, Z. A., Liu, Z. Q., Lou, X. C., Lu, F. X., Lu, H. J., Lu, J. G., Lu, X. L., Lu, Y., Lu, Y. P., Lu, Z. H., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Lyu, X. R., Lyu, Y. F., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, R. Q., Ma, R. T., Ma, X. Y., Ma, Y., Maas, F. E., Maggiora, M., Maldaner, S., Malde, S., Malik, Q. A., Mangoni, A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Miao, H., Min, T. J., Mitchell, R. E., Mo, X. H., Muchnoi, N. Yu., Muramatsu, H., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, X., Pan, Y., Pathak, A., Pelizaeus, M., Peng, H. P., Pettersson, J., Ping, J. L., Ping, R. G., Plura, S., Pogodin, S., Poling, R., Prasad, V., Qi, H., Qi, H. R., Qi, M., Qi, T. Y., Qian, S., Qian, W. B., Qian, Z., Qiao, C. F., Qin, J. J., Qin, L. Q., Qin, X. P., Qin, X. S., Qin, Z. H., Qiu, J. F., Qu, S. Q., Rashid, K. H., Redmer, C. F., Ren, K. J., Rivetti, A., Rodin, V., Rolo, M., Rong, G., Rosner, Ch., Ruan, S. N., Sang, H. S., Sarantsev, A., Schelhaas, Y., Schnier, C., Schoenning, K., Scodeggio, M., Shan, K. Y., Shan, W., Shan, X. Y., Shangguan, J. F., Shao, L. G., Shao, M., Shen, C. P., Shen, H. F., Shen, X. Y., Shi, B. -A., Shi, H. C., Shi, R. S., Shi, X., Shi, X. D, Song, J. J., Song, W. M., Song, Y. X., Sosio, S., Spataro, S., Stieler, F., Su, K. X., Su, P. P., Su, Y. -J., Sun, G. X., Sun, H., Sun, H. K., Sun, J. F., Sun, L., Sun, S. S., Sun, T., Sun, W. Y., Sun, X, Sun, Y. J., Sun, Y. Z., Sun, Z. T., Tan, Y. H., Tan, Y. X., Tang, C. J., Tang, G. Y., Tang, J., Tao, L. Y, Tao, Q. T., Teng, J. X., Thoren, V., Tian, W. H., Tian, Y., Uman, I., Wang, B., Wang, B. L., Wang, C. W., Wang, D. Y., Wang, F., Wang, H. J., Wang, H. P., Wang, K., Wang, L. L., Wang, M., Wang, M. Z., Wang, Meng, Wang, S., Wang, T., Wang, T. J., Wang, W., Wang, W. H., Wang, W. P., Wang, X., Wang, X. F., Wang, X. L., Wang, Y. D., Wang, Y. F., Wang, Y. H., Wang, Y. Q., Wang, Z., Wang, Z. Y., Wang, Ziyi, Wei, D. H., Weidner, F., Wen, S. P., White, D. J., Wiedner, U., Wilkinson, G., Wolke, M., Wollenberg, L., Wu, J. F., Wu, L. H., Wu, L. J., Wu, X., Wu, X. H., Wu, Y., Wu, Z., Xia, L., Xiang, T., Xiao, D., Xiao, G. Y., Xiao, H., Xiao, S. Y., Xiao, Y. L., Xiao, Z. J., Xie, C., Xie, X. H., Xie, Y., Xie, Y. G., Xie, Y. H., Xie, Z. P., Xing, T. Y., Xu, C. F., Xu, C. J., Xu, G. F., Xu, H. Y., Xu, Q. J., Xu, S. Y., Xu, X. P., Xu, Y. C., Xu, Z. P., Yan, F., Yan, L., Yan, W. B., Yan, W. C., Yang, H. J., Yang, H. L., Yang, H. X., Yang, L., Yang, S. L., Yang, Y. F., Yang, Y. X., Yang, Yifan, Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, G., Yu, T., Yuan, C. Z., Yuan, L., Yuan, S. C., Yuan, X. Q., Yuan, Y., Yuan, Z. Y., Yue, C. X., Zafar, A. A., Zeng, F. R., Zeng, X. Zeng, Zeng, Y., Zhan, Y. H., Zhang, A. Q., Zhang, B. L., Zhang, B. X., Zhang, D. H., Zhang, G. Y., Zhang, H., Zhang, H. H., Zhang, H. Y., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. X., Zhang, J. Y., Zhang, J. Z., Zhang, Jianyu, Zhang, Jiawei, Zhang, L. M., Zhang, L. Q., Zhang, Lei, Zhang, P., Zhang, Q. Y., Zhang, Shulei, Zhang, X. D., Zhang, X. M., Zhang, X. Y., Zhang, Y., Zhang, Y. T., Zhang, Y. H., Zhang, Yan, Zhang, Yao, Zhang, Z. H., Zhang, Z. Y., Zhao, G., Zhao, J., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, Y. B., Zhao, Y. X., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, Y. H., Zhong, B., Zhong, C., Zhong, X., Zhou, H., Zhou, L. P., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. Z., Zhu, J., Zhu, K., Zhu, K. J., Zhu, L. X., Zhu, S. H., Zhu, S. Q., Zhu, T. J., Zhu, W. J., Zhu, Y. C., Zhu, Z. A., Zou, B. S., Zou, J. H., Energy and Sustainability Research Institute Groni, Nuclear Energy, İstinye Üniversitesi, Rektörlük, AR-GE, Serkant Ali Çetin / 0000-0001-5050-8441, Cetin, Serkant Ali, Serkant Ali Çetin / AGF-0147-2022, and Serkant Ali Çetin / 34567544400

Subjects
Nuclear and High Energy Physics, integrated luminosity, %2Be<^>-+%24+annihilation%22">$ e<^>+e<^>- $ annihilation, Bhabha scattering, FOS: Physical sciences, Astronomy and Astrophysics, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), ee annihilation, ddc:530, High Energy Physics::Experiment, Instrumentation
Abstract

The integrated luminosities of the data samples collected in the BESIII experiment in 2016--2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. The integrated luminosities of the old data sets collected in 2010--2014 are updated by considering correction related to the detector performance, offsettting the effect of newly discovered readout errors in the electromagnetic calorimeter that happen haphazardly., published version

Published
2022
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12. Lorentz violation, gravitoelectromagnetism and Bhabha scattering at finite temperature.

Author

Santos, A. F. and Khanna, Faqir C.

Subjects
*LORENTZ force, *ELECTROMAGNETISM, *GRAVITATIONAL fields, *COVARIANT field theories, *SCATTERING (Physics)
Abstract

Gravitoelectromagnetism (GEM) is an approach for the gravitation field that is described using the formulation and terminology similar to that of electromagnetism. The Lorentz violation is considered in the formulation of GEM that is covariant in its form. In practice, such a small violation of the Lorentz symmetry may be expected in a unified theory at very high energy. In this paper, a non-minimal coupling term, which exhibits Lorentz violation, is added as a new term in the covariant form. The differential cross-section for Bhabha scattering in the GEM framework at finite temperature is calculated that includes Lorentz violation. The Thermo Field Dynamics (TFD) formalism is used to calculate the total differential cross-section at finite temperature. The contribution due to Lorentz violation is isolated from the total cross-section. It is found to be small in magnitude. [ABSTRACT FROM AUTHOR]

Published
2018
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13. Unparticle effects on Bhabha scattering.

Author

Anh, Sa Thi Lan, Trang, Trieu Quynh, Huong, Nguyen Thu, and Bang, Ha Huy

Subjects
*SCATTERING (Physics), *COLLISIONS (Nuclear physics), *SURFACE scattering, *PARTICLES, *PARTICULATE matter
Abstract

In this paper, we investigate the possible unparticle signatures through Bhabha scattering. The numerical results show that the angular distribution with unparticle effects can be up to 42% of the one that is confirmed by Born QED and Born + 1-loop QED calculation and the total cross section with unparticle effects are about 0.04-4.24 pb. This could have important implications for unparticle searches and for the measurement of the cross section of the Bhabha scattering. [ABSTRACT FROM AUTHOR]

Published
2018
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14. Lorentz violation, gravitoelectromagnetic field and Bhabha scattering.

Author

Santos, A. F. and Khanna, Faqir C.

Subjects
*LORENTZ force, *GRAVITATIONAL fields, *ELECTROMAGNETISM, *SCATTERING (Physics), *PARTICLE physics, *GENERAL relativity (Physics)
Abstract

Lorentz symmetry is a fundamental symmetry in the Standard Model (SM) and in General Relativity (GR). This symmetry holds true for all models at low energies. However, at energies near the Planck scale, it is conjectured that there may be a very small violation of Lorentz symmetry. The Standard Model Extension (SME) is a quantum field theory that includes a systematic description of Lorentz symmetry violations in all sectors of particle physics and gravity. In this paper, SME is considered to study the physical process of Bhabha Scattering in the Gravitoelectromagnetism (GEM) theory. GEM is an important formalism that is valid in a suitable approximation of general relativity. A new nonminimal coupling term that violates Lorentz symmetry is used in this paper. Differential cross-section for gravitational Bhabha scattering is calculated. The Lorentz violation contributions to this GEM scattering cross-section are small and are similar in magnitude to the case of the electromagnetic field. [ABSTRACT FROM AUTHOR]

Published
2018
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16. Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV

Author

Ablikim, M., Adlarson, Patrik, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Pettersson, Joachim, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, Liu, H. B., Ablikim, M., Adlarson, Patrik, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Pettersson, Joachim, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Liu, H. B.

Abstract

The integrated luminosities of data samples collected in the BESIII experiment in 2016-2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. The integrated luminosities of old datasets collected in 2010-2014 are updated by considering corrections related to detector performance, offsetting the effect of newly discovered readout errors in the electromagnetic calorimeter, which can haphazardly occur., For complete list of authors see http://dx.doi.org/10.1088/1674-1137/ac80b4

Published
2022
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20. Online monitoring of the center-of-mass energy from real data at BESIII

Author

Yanjia Xiao, Xiaobin Ji, and Jiada Lu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 01 natural sciences, Momentum, Cross section (physics), Nuclear Energy and Engineering, 0103 physical sciences, Signal extraction, Calibration, Invariant mass, Center of mass, 010306 general physics, Energy (signal processing), Bhabha scattering
Abstract

Background Data Quality Monitoring system (DQM) was developed to monitor data quality at BESIII experiment in real time. The stable center-of-mass energy ($$E_\mathrm{cms}$$ E cms ) is essential for the data taking. Online monitoring the $$E_\mathrm{cms}$$ E cms can help find the beam energy shift in time. Purpose The purpose is to monitor the $$E_\mathrm{cms}$$ E cms in DQM system in real time. Methods The $$E_\mathrm{cms}$$ E cms is measured using Bhabha scattering process in DQM system, due to its large cross section and low background level. The $$E_\mathrm{cms}$$ E cms is calculated from the invariant mass of $$e^{+}e^{-}$$ e + e - , and the correction value from radiation effect and momentum calibration. Result The $$E_\mathrm{cms}$$ E cms calculated with DQM system shows a good consistency with that from offline reconstruction within error. The results are validated with data taken in 2013. The overall systematic uncertainty includes 0.39 MeV/c$$^2$$ 2 from signal extraction and 2.54 MeV/c$$^2$$ 2 from calibration and radiation correction. Conclusions The $$E_\mathrm{cms}$$ E cms calculated from Bhabha scattering process is now available on DQM system in real time, which can be used as references for researchers to operate BESIII experiment.

Published
2020
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21. Electroweak Corrections with Allowance for Hard Bremsstrahlung in Polarized Bhabha Scattering

Author

S. G. Barkanova, Yu. M. Bystritskiy, Aleksandrs Aleksejevs, and V. A. Zykunov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, Electroweak interaction, Bremsstrahlung, Electron, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Positron, law, 0103 physical sciences, Radiative transfer, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Collider, Bhabha scattering
Abstract

A total set of one-loop electroweak radiative corrections, including the contribution of the emission of real hard photons (hard-bremsstrahlung contribution), to observables of polarized Bhabha scattering is calculated. A numerical analysis of observed spatial and polarization asymmetries with allowance for electroweak corrections is performed for low-energy experiments of the Belle II type and for the future electron– positron collider ILC/CLIC.

Published
2020
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22. Application of Asymptotic Methods to Calculating Electroweak Corrections in Polarized Bhabha Scattering

Author

V. A. Zykunov, S. G. Barkanova, Yu. M. Bystritskiy, and Aleksandrs Aleksejevs

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Numerical analysis, Electroweak interaction, Observable, Polarization (waves), Asymmetry, Atomic and Molecular Physics, and Optics, Renormalization, Radiative transfer, High Energy Physics::Experiment, media_common, Bhabha scattering
Abstract

Asymptotic expressions for one-loop electroweak radiative corrections to observables of polarized Bhabha scattering are obtained within the on-shell renormalization scheme. The results of a numerical analysis of relative one-loop electroweak corrections to the cross section and polarization asymmetry are reproduced at energies below and above the $$Z$$ resonance. A successful comparison with exact results obtained by means of computer-algebra systems is performed.

Published
2020
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23. Two-loop Bhabha scattering at high energy beyond leading power approximation.

Author

Penin, Alexander A. and Zerf, Nikolai

Subjects
*PARTICLES (Nuclear physics), *ELECTRON scattering, *NUCLEAR structure, *LOGARITHMIC functions, *ASTRONOMICAL perturbation
Abstract

We evaluate the two-loop O ( m e 2 / s ) contribution to the wide-angle high-energy electron–positron scattering in the double-logarithmic approximation. The origin and the general structure of the power-suppressed double logarithmic corrections are discussed in detail. [ABSTRACT FROM AUTHOR]

Published
2016
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24. Design and performance of a lead fluoride detector as a luminosity monitor.

Author

Pérez Benito, R., Khaneft, D., O'Connor, C., Capozza, L., Diefenbach, J., Gläser, B., Ma, Y., Maas, F.E., and Rodríguez Piñeiro, D.

Subjects
*OPTICAL sensors, *LEAD fluoride, *LUMINOSITY, *SCATTERING (Physics), *CALORIMETERS, *MONTE Carlo method
Abstract

Precise luminosity measurements for the OLYMPUS two-photon exchange experiment at DESY were performed by counting scattering events with alternating beams of electrons and positrons incident on atomic electrons in a gaseous hydrogen target. Final products of Møller, Bhabha, and pair annihilation interactions were observed using a pair of lead fluoride Cherenkov calorimeters with custom housings and electronics, adapted from a system used by the A4 parity violation experiment at MAMI. This paper describes the design, calibration, and operation of these detectors. An explanation of the Monte Carlo methods used to simulate the physical processes involved both at the scattering vertices and in the detector apparatus is also included. [ABSTRACT FROM AUTHOR]

Published
2016
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27. On the Bhabha scattering for z = 2 Lifshitz QED.

Author

Bufalo, R.

Subjects
*SCATTERING (Physics), *DIFFERENTIAL cross sections, *PHOTONS, *LIFSHITZ point (Physics), *FERMIONS
Abstract

In this paper, we compute and discuss the differential cross-section of the Bhabha scattering in the framework of the z = 2 Lifshitz quantum electrodynamics (QED). We start by constructing the classical solutions for the fermionic fields, in particular the completeness relations, and also derive the theory's propagators. Afterwards, we compute the photon exchange and pair annihilation contributions for the Bhabha's process, and upon achieving the results we establish the magnitude of the theory's free parameter by looking for small deviations of the QED tree results. [ABSTRACT FROM AUTHOR]

Published
2015
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28. Effects of the CPT-even and Lorentz violation on the Bhabha scattering at finite temperature

Author

A. F. Santos, Faqir C. Khanna, and P.R.A. Souza

Subjects
Physics, Coupling, High Energy Physics - Theory, Photon, 010308 nuclear & particles physics, Lorentz transformation, FOS: Physical sciences, General Physics and Astronomy, Context (language use), Fermion, 01 natural sciences, Term (time), symbols.namesake, High Energy Physics - Theory (hep-th), Quantum electrodynamics, 0103 physical sciences, symbols, High Energy Physics::Experiment, 010306 general physics, Differential (mathematics), Bhabha scattering
Abstract

In this paper a Lorentz-violating CPT-even non-minimal coupling term is considered. A new interaction term between fermions and photons emerges. In this context, the differential cross-section for Bhabha scattering at finite temperature is calculated. The temperature effects are introduced using the Thermo- Field Dynamics (TFD) formalism. It is shown that the differential cross-section is changed due to both effects, Lorentz violation and finite temperature., 14 pages, accepted for publication in Annals of Physics

Published
2021

29. Analytic results for two-loop planar master integrals for Bhabha scattering

Author

Lorenzo Tancredi, Vladimir A. Smirnov, and Claude Duhr

Subjects
High Energy Physics - Theory, Physics, Nuclear and High Energy Physics, Computation, FOS: Physical sciences, QC770-798, Type (model theory), Scattering amplitude, Loop (topology), High Energy Physics - Phenomenology, Planar, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Nuclear and particle physics. Atomic energy. Radioactivity, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Precision QED, Scattering Amplitudes, Computer Science::Data Structures and Algorithms, Differential (mathematics), Mathematical physics, Bhabha scattering, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

We analytically evaluate the master integrals for the second type of planar contributions to the massive two-loop Bhabha scattering in QED using differential equa- tions with canonical bases. We obtain results in terms of multiple polylogarithms for all the master integrals but one, for which we derive a compact result in terms of elliptic mul- tiple polylogarithms. As a byproduct, we also provide a compact analytic result in terms of elliptic multiple polylogarithms for an integral belonging to the first family of planar Bhabha integrals, whose computation in terms of polylogarithms was addressed previously in the literature., Comment: 28 pages, 3 figures

Published
2021
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30. Study of BESIII trigger efficiencies with the 2018 J/psi data

Author

Zhang Li, H. P. Wang, L. K. Li, S. Lusso, S. Maldaner, L. Koch, J. Pettersson, A. Khoukaz, L. Fava, M. H. Ye, J. Libby, X. Wu, Y. C. Zhu, X. H. Bai, L. Liu, X. D. Zhang, X. Y. Shan, Yaquan Fang, Y. H. Zheng, Y. J. Sun, X. L. Luo, A. G. Denig, T. Hussain, K. Ravindran, M. Shao, Y. J. Mo, Y. Schelhaas, R. Farinelli, G. F. Cao, X. D Shi, C. Zhong, B. Kopf, Y. P. Lu, C. Li, Fang Liu, V. Prasad, M. Z. Wang, Frederick A. Harris, X. Sun, J. Y. Zhao, Y. Pan, I. Denysenko, H. L. Ma, T. Lenz, K. Begzsuren, M. L. Chen, J. Z. Zhao, Y. H. Zhang, Yi Zhang, Ziyi Wang, X. R. Lyu, B. Q. Wang, X. Cai, M. Rolo, L. H. Wu, J. Z. Zhang, S. Marcello, J. F. Chang, Ulrich Wiedner, J. F. Qiu, L. P. Zhou, HR Qi, S. B. Liu, M. Pelizaeus, Z. Y. You, X. C. Dai, R. P. Guo, Xujin Yuan, W.-B. Qian, W. X. Gong, S. Ahmed, Zhi Yang, W. Ikegami Andersson, Y. X. Yang, J. P. Zheng, B. S. Zou, C. Herold, M. Kuessner, L. Z. Liao, L. Q. Huang, L. J. Wu, T. T. Han, Z. H. Qin, L. B. Guo, H T Zhang, J. L. Zhang, P. X. Shen, J. J. Lane, Shuang-Nan Zhang, Tao Luo, J. F. Sun, Yanping Huang, Niklaus Berger, Shuai Liu, G. Mezzadri, K. L. He, P. Kiese, W. G. Li, D. Liu, R. A. Briere, N. Yu. Muchnoi, Y. Nefedov, T. J. Min, Z. Huang, M. Albrecht, Guangyi Zhang, H. Liang, Y. Zeng, J. B. Liu, Zheng Wang, C. J. Tang, X. Liu, J. L. Ping, K. H. Rashid, Z. Wu, Q. Zhao, Yuanyuan Liu, Q. M. Ma, Y. Z. Sun, Q. P. Ji, Y. Hu, B. X. Yu, Zhe Sun, H. J. Yang, X. S. Jiang, Q. Zhou, L. Sun, Huanhuan Liu, A. Rivetti, M. N. Achasov, Mingming Ma, W. S. Cheng, I. K. Keshk, Liqing Zhang, W. L. Chang, P. T. Ge, E. M. Gersabeck, S. Jaeger, X. H. Xie, W. Xu, T. Liu, D. M. Li, Q. Liu, P. Larin, H. J. Lu, X. P. Xu, F. Weidner, J. B. Jiao, Xu Yan, Jin Li, C. W. Wang, S. Janchiv, J. F. Hu, Shulei Zhang, Y. T. Zhang, T. Y. Xing, H. L. Dai, Yuyi Wang, Gang Zhao, Z. P. Mao, Y. Yuan, J. L. Liu, W. Y. Sun, D. V. Dedovich, M. X. Luo, A. Calcaterra, C. Y Guan, H. J. Wang, T. Johansson, X. Wang, X. Zhou, R. Poling, X. F. Cui, Y. Ding, T. Holtmann, H. S. Sang, H. M. Hu, X. L. Lu, Y. X. Zhao, Y. F. Wang, J. L. Li, Y. G. Gao, J. X. Teng, Z. Y. Wang, H. Cai, Y. Zhang, Lei Li, R. G. Ping, F. E. Maas, T. Hu, Q. An, R. Kappert, M. Kavatsyuk, G. Yu, F. Feldbauer, R. Baldini Ferroli, X. F. Wang, R. Q. Ma, Yi Chen, R. S. Shi, Y. H. Xie, S. Q. Qu, S. S. Fang, S. Sosio, Z. J. Xiao, D. Bettoni, H. Muramatsu, A. A. Zafar, K. Schoenning, Jing Zhao, M. Kuemmel, M. H. Gu, J. Q. Li, A. Q. Guo, Feng Liu, L. L. Ma, Y. D. Wang, Q. A. Malik, B. J. Liu, Igor Boyko, M. Rump, F. Li, G. S. Huang, O. Bakina, T. Yu, W. Y. Han, W. Imoehl, L. Wollenberg, W. Shan, V. Thoren, M. Scodeggio, Z. X. Meng, J. F. Shangguan, L. Q. Qin, C. L. Luo, Ling Zhao, C. F. Qiao, H. M. Liu, T. Y. Qi, Ch. Rosner, D. C. Shan, M. Ablikim, H. Qi, S. F. Zhang, D. Y. Chen, S. X. Du, S. Pacetti, S. S. Sun, Y. H. Tan, M. Greco, L. Gong, M. Himmelreich, A. Pathak, S. Nisar, W. H. Wang, Wei Wang, W. Kühn, H Hüsken, Z. H. Lei, S. J. Zhao, P. Patteri, C. X. Yu, Zongyuan Wang, Lei Zhao, Z. L. Hou, Ming Qi, C. X. Yue, X. S. Kang, A. Dbeyssi, M. Bertani, Y. P. Guo, K. J. Zhu, P. W. Luo, G. X. Sun, Meng Wang, J. H. Feng, L. M. Gu, J. Q. Zhang, M. R. An, Yu Bai, H. Xiao, Q. J. Xu, H. K. Sun, Ke Li, J. Dong, Y. Y. Wang, X. Pan, Z. Y. Zhang, Li Yuan, P. R. Li, B. Zheng, X. Dong, Klaus Peters, Y. B. Liu, Zhiqing Zhang, W. J. Zhu, X. Y. Shen, M. Y. Dong, Z. Jiao, Fu-Hu Liu, Honghao Zhang, G. Wilkinson, I. Balossino, X. Y. Zhang, I. B. Nikolaev, H. Leithoff, R. T. Ma, Y. T. Liang, X. L. Ji, J. Bloms, M. Lellmann, X. H. Li, Xuanhong Lou, Y. K. Sun, X. L. Wang, X. R. Zhou, J. J. Zhang, M. Ye, C. H. Heinz, P. P. Su, Z. A. Liu, A. Kupsc, L. Xia, H. B. Jiang, G. A. Chelkov, Jiawei Zhang, C. Dong, M. G. Zhao, Q. Ouyang, R. E. de Boer, O. B. Kolcu, X. D. Shi, J. D. Lu, C. P. Shen, X. H. Mo, A. Lavania, H. B. Liu, M. Wolke, M. H. Liu, F. Bianchi, M. Fritsch, S. Y. Li, L. Yang, Y. B. Zhao, H. S. Chen, Z. Qian, M. Destefanis, H. C. Shi, Y. G. Xie, J. Y. Liu, S. Y. Xiao, Yongsheng Gao, F. C. Ma, J. H. Zou, M. G. Kurth, D. J. White, T. Sun, W. Gradl, G. Felici, Y. R. Hou, H. Li, C. Z. Yuan, W. D. Li, C. X. Lin, X. X. Ma, T. J. Zhu, G. Y. Tang, J. G. Messchendorp, Yifan Yang, B. X. Zhang, N. Kalantar-Nayestanaki, Ke Liu, L. L. Wang, T. Held, W. C. Yan, Jianyu Zhang, X. Y. Ma, K. X. Su, Y. X. Song, D. Y. Wang, Cheng Li, Y. L. Fan, X. B. Ji, Y. J. Mao, L. Lavezzi, G. F. Xu, V. Rodin, H. X. Yang, X. S. Qin, C. Geng, J. F. Wu, K. Y. Liu, I. Garzia, C. F. Redmer, Z. A. Zhu, C. Schnier, Y. Q. Wang, W. M. Song, Y. Ban, P. Weidenkaff, F. H. Heinsius, J. H. Yin, Lei Zhang, J. Tang, Y. T. Gu, N. Cao, S. Malde, S. Jin, S. Gu, A. Zhemchugov, X. T. Huang, Shi Chen, J. W. Zhang, K. Wang, R. Aliberti, S. H. Zhu, F. Nerling, G. F. Chen, R. E. Mitchell, J. Y. Zhang, A. Sarantsev, F. De Mori, D. H. Wei, J. S. Lange, L. Yan, Huihui Liu, Z. G. Zhao, I. Uman, L. Y. Dong, Y. K. Heng, S. P. Wen, S. L. Yang, A. Bortone, C. Q. Feng, A. N. Zhu, Hong-Lei Li, S. Spataro, X. K. Zhou, J. G. Lu, J. Zhu, A Gilman, F. Cossio, M. Irshad, Zhiqing Liu, F. F. Sui, P. Adlarson, Z. Ning, R. Kiuchi, K. H. Qi, Z. J. Chen, K. Goetzen, J. Fang, F. Yan, X. Q. Hao, W. B. Yan, Zhenxiong Yuan, S. L. Olsen, W. M. Liu, Yan Zhang, S. A. Cetin, Peilian Liu, C. X. Liu, Huaqiao Zhang, R. Kliemt, A. Amoroso, A. Mangoni, A. Guskov, G. Cibinetto, S. Nakhoul, A. Yuncu, Jie Yu, M. Maggiora, Y. Jin, Yao Zhang, G. Li, C. D. Fu, X. R. Chen, Z. Y. Deng, Xingguo Li, G. Rong, W. Wang, F. X. Lu, Y. X. Tan, H. J. Li, C. H. Li, B. C. Ke, H. P. Peng, S. Qian, Y. F. Liang, B. Zhong, and KVI - Center for Advanced Radiation Technology

Subjects
Nuclear and High Energy Physics, hadronic events, Hadron, 01 natural sciences, NO, High Energy Physics - Experiment, Nuclear physics, Subatomär fysik, BESIII, trigger efficiency, Bhabha, dimuon, 0103 physical sciences, Subatomic Physics, ddc:530, 010306 general physics, Instrumentation, Bhabha scattering, Physics, 010308 nuclear & particles physics, Detector, Astronomy and Astrophysics, Charged particle, High Energy Physics::Experiment, BESIII, trigger efficiency, Bhabha, dimuon, hadronic events
Abstract

Using a dedicated data sample taken in 2018 on the $J/\psi$ peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha-scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches $100\%$ in most cases with uncertainties small enough as not to affect most physics analyses., Comment: 8 pages

Published
2021
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31. Study of theoretical luminosity precision for electron colliders at higher energies

Author

S. Jadach, M. Skrzypek, Bennie F.L. Ward, and Wieslaw Placzek

Subjects
Physics, Particle physics, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Monte Carlo method, Electron, QC770-798, Astrophysics, law.invention, QB460-466, law, Nuclear and particle physics. Atomic energy. Radioactivity, Collider, Engineering (miscellaneous), Order of magnitude, Bhabha scattering, Event generator
Abstract

We present an estimation of the theoretical precision of low angle Bhabha scattering at the proposed future ILC collider at 500 GeV. The analysis is an extension of the previous analysis done for the FCCee collider at $$\sqrt{s}=M_Z$$ s = M Z . As the state-of-the-art and the reference point we use the Monte Carlo event generator. Based on the current precision status of for LEP analysis, we estimate how various error components evolve from the LEP to ILC setups. The conclusion of our work is that for the ILC the precision of the current version of 4.04 deteriorates to 0.5%, by more than an order of magnitude w.r.t. the present precision for LEP. With the expected future improvements, the precision of can change to 0.016%, nearly as good as for the FCCee at the $$M_Z$$ M Z setup (0.01%). Based on the developed methodology we present also results for ILC$$_{1000}$$ 1000 , FCCee$$_{350}$$ 350 and CLIC$$_{3000}$$ 3000 setups.

Published
2021

32. Bhabha scattering at NNLO with next-to-soft stabilisation

Author

Adrian Signer, Pulak Banerjee, T. Engel, Nicolas Schalch, Yannick Ulrich, University of Zurich, and Engel, Tim

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Soft photon, 530 Physics, 010308 nuclear & particles physics, QC1-999, Monte Carlo method, FOS: Physical sciences, 10192 Physics Institute, Fermion, 01 natural sciences, High Energy Physics - Phenomenology, Matrix (mathematics), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Gravitational singularity, Development (differential geometry), 3106 Nuclear and High Energy Physics, Differential (infinitesimal), 010306 general physics, Bhabha scattering
Abstract

A critical subject in fully differential QED calculations originates from numerical instabilities due to small fermion masses that act as regulators of collinear singularities. At next-to-next-to-leading order (NNLO) a major challenge is therefore to find a stable implementation of numerically delicate real-virtual matrix elements. In the case of Bhabha scattering this has so far prevented the development of a fixed-order Monte Carlo at NNLO accuracy. In this paper we present a new method for stabilising the real-virtual matrix element. It is based on the expansion for soft photon energies including the non-universal subleading term calculated with the method of regions. We have applied this method to Bhabha scattering to obtain a stable and efficient implementation within the McMule framework. We therefore present for the first time fully differential results for the photonic NNLO corrections to Bhabha scattering., Comment: 6 pages, 3 figures

Published
2021
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34. Probing Space-time Noncommutativity in the Bhabha Scattering

Author

Linda Ghegal

Subjects
High Energy Physics - Theory, Physics, Particle physics, Mathematics::Operator Algebras, Space time, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Scale (descriptive set theory), Lambda, First order, Noncommutative geometry, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Mathematics::K-Theory and Homology, Mathematics::Quantum Algebra, High Energy Physics::Experiment, Noncommutative standard model, Energy (signal processing), Bhabha scattering
Abstract

We investigate the Bhabha scattering with the Seiberg–Witten expended noncommutative Standard Model scenario to the first order of the noncommutativity parameter \({\mit \Theta }_{\mu \nu }\). This study is based on the definition of the noncommutativity parameter that we have assumed. We explore the noncommutative scale \({\mit \Lambda }_{_\mathrm {NC}}\geq 0.8\) TeV considering different machine energy ranging from 0.5 TeV to 1.5 TeV.

Published
2020

35. Radion Effects on Bhabha Scattering

Author

Nguyen Thi Thu Huyen, Ha Huy Bang, Nguyen Thi Thuy Linh, Pham Que Duong, and Nguyen Nhu Xuan

Subjects
Physics, Particle physics, Bhabha scattering
Abstract

In this article, we have considered the possible signatures of radion through Bhabha scattering. The numerical results show that the total cross section with radion effects are about 1.43-19.70 pb. This could have important implications for radion searches and for the measurement of the cross-section of the Bhabha scattering.

Published
2020
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36. Simulating hard photon production with WHIZARD

Author

J. Kalinowski, Aleksander Filip Żarnecki, Wojciech Kotlarski, and Pawel Sopicki

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Generator (category theory), Physics beyond the Standard Model, FOS: Physical sciences, lcsh:Astrophysics, 01 natural sciences, Standard Model, High Energy Physics - Phenomenology, Pair production, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, lcsh:QB460-466, lcsh:QC770-798, Production (computer science), lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Neutrino, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment, Lepton, Bhabha scattering
Abstract

One of the important goals of the proposed future $e^+e^-$ collider experiments is the search for dark matter particles using different experimental approaches. The most general search approach is based on the mono-photon signature, which is expected when production of the invisible final state is accompanied by a hard photon from initial state radiation. Analysis of the energy spectrum and angular distributions of those photons can shed light on the nature of dark matter and its interactions. Therefore, it is crucial to be able to simulate the signal and background samples in a uniform framework, to avoid possible systematic biases. The WHIZARD program is a flexible tool, which is widely used by $e^+e^-$ collaborations for simulation of many different "new physics" scenarios. We propose the procedure of merging the matrix element calculations with the lepton ISR structure function implemented in WHIZARD. It allows us to reliably simulate the mono-photon events, including the two main Standard Model background processes: radiative neutrino pair production and radiative Bhabha scattering. We demonstrate that cross sections and kinematic distributions of mono-photon in neutrino pair-production events agree with corresponding predictions of the KKMC, a Monte Carlo generator providing perturbative predictions for SM and QED processes, which has been widely used in the analysis of LEP data., 17 pages, 8 figures, 6 tables, 2 example steering files

Published
2020

37. One-Loop Electroweak Radiative Corrections to Bhabha Scattering in the Belle II Experiment

Author

V. A. Zykunov, Yu. M. Bystritskiy, S. Barkanova, and Aleksandrs Aleksejevs

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electroweak interaction, FOS: Physical sciences, 01 natural sciences, Standard Model, Loop (topology), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Photon emission, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, 010306 general physics, Bhabha scattering
Abstract

The Standard Model radiative corrections to the Bhabha scattering process are considered within the one-loop approximation. Both virtual corrections and corrections for the real photon emission are taken into consideration. The calculation was performed at the energy assumed at the Belle II (Japan) facility., Comment: 6 pages, 9 figures, proceedings for International Bogolyubov Conference Problems of Theoretical and Mathematical Physics (2019)

Published
2020
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39. Numerical scheme for treatment of Uehling–Uhlenbeck equation for two-particle interactions in relativistic plasma

Author

I. A. Siutsou, M. A. Prakapenia, and Gregory Vereshchagin

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Numerical Analysis, Conservation law, Annihilation, Physics and Astronomy (miscellaneous), Applied Mathematics, Compton scattering, FOS: Physical sciences, Position and momentum space, 01 natural sciences, Computer Science Applications, Computational Mathematics, Matrix (mathematics), Pair production, Relativistic plasma, Modeling and Simulation, Quantum electrodynamics, 0103 physical sciences, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, 010303 astronomy & astrophysics, Bhabha scattering
Abstract

We present a new efficient method to compute Uehling–Uhlenbeck collision integral for all two-particle interactions in relativistic plasma with drastic improvement in computation time with respect to existing methods. Plasma is assumed isotropic in momentum space. The set of reactions consists of: Moeller and Bhabha scattering, Compton scattering, two-photon pair annihilation, and two-photon pair production, which are described by QED matrix elements. In our method exact energy and particle number conservation laws are fulfilled. Reaction rates are compared, where possible, with the corresponding analytical expressions and convergence of numerical rates is demonstrated.

Published
2018
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40. Unparticle effects on Bhabha scattering

Author

Ha Huy Bang, Sa Thi Lan Anh, Nguyen Thu Huong, and Trieu Quynh Trang

Subjects
Physics, Particle physics, Angular distribution, 010308 nuclear & particles physics, 0103 physical sciences, Unparticle physics, General Physics and Astronomy, 010306 general physics, 01 natural sciences, Physics::History of Physics, Computer Science::Databases, Bhabha scattering
Abstract

In this paper, we investigate the possible unparticle signatures through Bhabha scattering. The numerical results show that the angular distribution with unparticle effects can be up to 42% of the ...

Published
2018
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48. Description and performances of luminosity and background detectors at the upgraded e+e− collider

Author

Boscolo, M., Bossi, F., Buonomo, B., Mazzitelli, G., Murtas, F., Raimondi, P., Sensolini, G., Schioppa, M., Iacoangeli, F., Valente, P., Arnaud, N., Breton, D., Burmistrov, L., Stocchi, A., Variola, A., Viaud, B., and Branchini, P.

Subjects
*SCATTERING (Physics), *CALORIMETRY, *COLLISIONS (Nuclear physics), *COLLIDERS (Nuclear physics), *LUMINESCENCE, *DETECTORS
Abstract

Abstract: Testing the new crab waist collision scheme at the e+e− Frascati accelerator complex requires a fast and accurate measurement of the absolute luminosity, as well as a full characterization of the background conditions. To fulfill these requirements, dedicated detectors have been built by the LUMI Collaboration and operated during the 2008 and 2009 runs, providing valuable inputs for the accelerator team. This article motivates their design, describes their installation in the modified interaction region and presents their performances. Another article in the same issue focuses on the results achieved using these detectors. [ABSTRACT FROM AUTHOR]

Published
2010
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49. Luminosity and background measurements at the e+e− collider upgraded with the crab waist scheme

Author

Boscolo, M., Bossi, F., Buonomo, B., Mazzitelli, G., Murtas, F., Raimondi, P., Sensolini, G., Schioppa, M., Iacoangeli, F., Valente, P., Arnaud, N., Breton, D., Burmistrov, L., Stocchi, A., Variola, A., Viaud, B., and Branchini, P.

Subjects
*CALORIMETERS, *COLLIDERS (Nuclear physics), *COLLISIONS (Nuclear physics), *BREMSSTRAHLUNG, *SCATTERING (Physics), *ELECTRON accelerators
Abstract

Abstract: The crab waist collision scheme has been successfully tested at the e+e− Frascati collider during the 2008–2009 runs: the gain in luminosity is consistent with the predictions while the background remains sustainable. Among the various inputs used by the accelerator team to steer this new machine and improve its performances, key online information, absolute luminosity and background level measurements, has been provided by the LUMI detectors: a Bhabha calorimeter and two gamma bremsstrahlung proportional counters. This paper focuses on the results achieved with this experimental setup, described in details in another article. [ABSTRACT FROM AUTHOR]

Published
2010
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50. Functional equations for one-loop master integrals for heavy-quark production and Bhabha scattering

Author

Kniehl, Bernd A. and Tarasov, Oleg V.

Subjects
*FUNCTIONAL equations, *QUARKS, *NUCLEAR reactions, *SCATTERING (Physics), *FEYNMAN integrals, *HYPERGEOMETRIC functions
Abstract

Abstract: The method for obtaining functional equations, recently proposed by one of the authors [O.V. Tarasov, Phys. Lett. B 670 (2008) 67, arXiv:0809.3028 [hep-ph]], is applied to one-loop box integrals needed in calculations of radiative corrections to heavy-quark production and Bhabha scattering. We present relationships between these integrals with different arguments and box integrals with all propagators being massless. It turns out that functional equations are rather useful for finding imaginary parts and performing analytic continuations of Feynman integrals. For the box master integral needed in Bhabha scattering, a new representation in terms of hypergeometric functions admitting one-fold integral representations is derived. The hypergeometric representation of a master integral for heavy-quark production follows from the functional equation. [Copyright &y& Elsevier]

Published
2009
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