467 results on '"bhabha scattering"'
Search Results
2. Online monitoring of the center-of-mass energy from real data at BESIII
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Yanjia Xiao, Xiaobin Ji, and Jiada Lu
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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.
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- 2020
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3. Electroweak Corrections with Allowance for Hard Bremsstrahlung in Polarized Bhabha Scattering
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S. G. Barkanova, Yu. M. Bystritskiy, Aleksandrs Aleksejevs, and V. A. Zykunov
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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.
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- 2020
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4. Application of Asymptotic Methods to Calculating Electroweak Corrections in Polarized Bhabha Scattering
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V. A. Zykunov, S. G. Barkanova, Yu. M. Bystritskiy, and Aleksandrs Aleksejevs
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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.
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- 2020
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5. Effects of the CPT-even and Lorentz violation on the Bhabha scattering at finite temperature
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A. F. Santos, Faqir C. Khanna, and P.R.A. Souza
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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
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- 2021
6. Analytic results for two-loop planar master integrals for Bhabha scattering
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Lorenzo Tancredi, Vladimir A. Smirnov, and Claude Duhr
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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
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- 2021
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7. Study of BESIII trigger efficiencies with the 2018 J/psi data
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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
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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
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- 2021
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8. Study of theoretical luminosity precision for electron colliders at higher energies
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S. Jadach, M. Skrzypek, Bennie F.L. Ward, and Wieslaw Placzek
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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.
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- 2021
9. Bhabha scattering at NNLO with next-to-soft stabilisation
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Adrian Signer, Pulak Banerjee, T. Engel, Nicolas Schalch, Yannick Ulrich, University of Zurich, and Engel, Tim
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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
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- 2021
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10. Probing Space-time Noncommutativity in the Bhabha Scattering
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Linda Ghegal
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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.
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- 2020
11. Radion Effects on Bhabha Scattering
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Nguyen Thi Thu Huyen, Ha Huy Bang, Nguyen Thi Thuy Linh, Pham Que Duong, and Nguyen Nhu Xuan
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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.
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- 2020
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12. Simulating hard photon production with WHIZARD
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J. Kalinowski, Aleksander Filip Żarnecki, Wojciech Kotlarski, and Pawel Sopicki
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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
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- 2020
13. One-Loop Electroweak Radiative Corrections to Bhabha Scattering in the Belle II Experiment
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V. A. Zykunov, Yu. M. Bystritskiy, S. Barkanova, and Aleksandrs Aleksejevs
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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)
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- 2020
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14. Numerical scheme for treatment of Uehling–Uhlenbeck equation for two-particle interactions in relativistic plasma
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I. A. Siutsou, M. A. Prakapenia, and Gregory Vereshchagin
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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.
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- 2018
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15. Unparticle effects on Bhabha scattering
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Ha Huy Bang, Sa Thi Lan Anh, Nguyen Thu Huong, and Trieu Quynh Trang
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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 ...
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- 2018
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16. Lorentz violation, Bhabha scattering and finite temperature
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Alesandro Santos
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Physics ,symbols.namesake ,Lorentz transformation ,Quantum electrodynamics ,symbols ,High Energy Physics::Experiment ,Physics::Classical Physics ,Bhabha scattering - Abstract
In this paper an introduction to Lorentz violation has been done. Corrections due to Lorentzviolation for the cross section of the Bhabha scattering has been calculated at zero and finitetemperature. The finite temperature corrections are calculated using the Thermo Field Dynamics(TFD) formalism.
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- 2019
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17. Electrical conductivity of hot Abelian plasma with scalar charge carriers
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O. O. Sobol
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High Energy Physics - Theory ,gauge-theories ,Differential equation ,Scalar (mathematics) ,FOS: Physical sciences ,Computer Science::Digital Libraries ,7. Clean energy ,01 natural sciences ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,transport-coefficients ,Abelian group ,010306 general physics ,quark-gluon ,Mathematical physics ,Bhabha scattering ,Physics ,Coupling constant ,magnetic-fields ,010308 nuclear & particles physics ,Momentum transfer ,Order (ring theory) ,Propagator ,dynamics ,excitations ,High Energy Physics - Phenomenology ,High Energy Physics - Theory (hep-th) - Abstract
We study the electrical conductivity of hot Abelian plasma containing scalar charge carriers in the leading logarithmic order in coupling constant $\alpha$ using the Boltzmann kinetic equation. The leading contribution to the collision integral is due to the M{\o}ller and Bhabha scattering of scalar particles with a singular cross section in the region of small momentum transfer. Regularizing this singularity by taking into account the hard thermal loop corrections to the propagators of intermediate particles, we derive the second order differential equation which determines the kinetic function. We solve this equation numerically and also use a variational approach in order to find a simple analytical formula for the conductivity. It has the standard parametric dependence on the coupling constant $\sigma\approx 2.38\, T/(\alpha \log\alpha^{-1})$ with the prefactor taking a somewhat lower value compared to the fermionic case. Finally, we consider the general case of hot Abelian plasma with an arbitrary number of scalar and fermionic particle species and derive the simple analytical formula for its conductivity., Comment: 36 pages, 2 figures, 4 tables
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- 2019
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18. FCC-ee: The Lepton Collider – Future Circular Collider Conceptual Design Report Volume 2
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Abada, A, Abbrescia, M, AbdusSalam, SS, Abdyukhanov, I, Fernandez, J Abelleira, Abramov, A, Aburaia, M, Acar, AO, Adzic, PR, Agrawal, P, Aguilar-Saavedra, JA, Aguilera-Verdugo, JJ, Aiba, M, Aichinger, I, Aielli, G, Akay, A, Akhundov, A, Aksakal, H, Albacete, JL, Albergo, S, Alekou, A, Aleksa, M, Aleksan, R, Fernandez, RM Alemany, Alexahin, Y, Alia, RG, Alioli, S, Tehrani, N Alipour, Allanach, BC, Allport, PP, Altinli, M, Altmannshofer, W, Ambrosio, G, Amorim, D, Amstutz, O, Anderlini, L, Andreazza, A, Andreini, M, Andriatis, A, Andris, C, Andronic, A, Angelucci, M, Antinori, F, Antipov, SA, Antonelli, M, Antonello, M, Antonioli, P, Antusch, S, Anulli, F, Apolinario, L, Apollinari, G, Apollonio, A, Appelo, D, Appleby, RB, Apyan, A, Arbey, A, Arbuzov, A, Arduini, G, Ari, V, Arias, S, Armesto, N, Arnaldi, R, Arsenyev, SA, Arzeo, M, Asai, S, Aslanides, E, Assmann, RW, Astapovych, D, Atanasov, M, Atieh, S, Attie, D, Auchmann, B, Audurier, A, Aull, S, Aumon, S, Aune, S, Avino, F, Avrillaud, G, Aydin, G, Azatov, A, Azuelos, G, Azzi, P, Azzolini, O, Azzurri, P, Bacchetta, N, Bacchiocchi, E, Bachacou, H, Baek, YW, Baglin, V, Bai, Y, Baird, S, Baker, MJ, Baldwin, MJ, Ball, AH, Ballarino, A, Banerjee, S, Barber, DP, Barducci, D, Barjhoux, P, Barna, D, Barnafoldi, GG, Barnes, MJ, Barr, A, Garcia, J Barranco, da Costa, J Barreiro Guimaraes, Bartmann, W, Baryshevsky, V, Barzi, E, Bass, SA, Bastianin, A, Baudouy, B, Bauer, F, Bauer, M, Baumgartner, T, Bautista-Guzman, I, Bayindir, C, Beaudette, F, Bedeschi, F, Beguin, M, Bellafont, I, Bellagamba, L, Bellegarde, N, Belli, E, Bellingeri, E, Bellini, F, Bellomo, G, Belomestnykh, S, Bencivenni, G, Benedikt, M, Bernardi, G, Bernardi, J, Bernet, C, Bernhardt, JM, Bernini, C, Berriaud, C, Bertarelli, A, Bertolucci, S, Besana, MI, Besancon, M, Beznosov, O, Bhat, P, Bhat, C, Biagini, ME, Biarrotte, J-L, Chevalier, A Bibet, Bielert, ER, Biglietti, M, Bilei, GM, Bilki, B, Biscari, C, Bishara, F, Blanco-Garcia, OR, Blanquez, FR, Blekman, F, Blondel, A, Bluemlein, J, Boccali, T, Boels, R, Bogacz, SA, Bogomyagkov, A, Boine-Frankenheim, O, Boland, MJ, Bologna, S, Bolukbasi, O, Bomben, M, Bondarenko, S, Bonvini, M, Boos, E, Bordini, B, Bordry, F, Borghello, G, Borgonovi, L, Borowka, S, Bortoletto, D, Boscherini, D, Boscolo, M, Boselli, S, Bosley, RR, Bossu, F, Botta, C, Bottura, L, Boughezal, R, Boutin, D, Bovone, G, Jelisavic, I Bozovic, Bozbey, A, Bozzi, C, Bozzini, D, Braccini, V, Braibant-Giacomelli, S, Bramante, J, Braun-Munzinger, P, Briffa, JA, Britzger, D, Brodsky, SJ, Brooke, JJ, Bruce, R, De Renstrom, P Bruckman, Bruna, E, Bruning, O, Brunner, O, Brunner, K, Bruzzone, P, Buffat, X, Bulyak, E, Burkart, F, Burkhardt, H, Burnet, J-P, Butin, F, Buttazzo, D, Butterworth, A, Caccia, M, Cai, Y, Caiffi, B, Cairo, V, Cakir, O, Calaga, R, Calatroni, S, Calderini, G, Calderola, G, Caliskan, A, Calvet, D, Calviani, M, Camalich, JM, Camarri, P, Campanelli, M, Camporesi, T, Canbay, AC, Canepa, A, Cantergiani, E, Cantore-Cavalli, D, Capeans, M, Cardarelli, R, Cardella, U, Cardini, A, Calame, CM Carloni, Carra, F, Carra, S, Carvalho, A, Casalbuoni, S, Casas, J, Cascella, M, Castelnovo, P, Castorina, G, Catalano, G, Cavasinni, V, Cazzato, E, Cennini, E, Cerri, A, Cerutti, F, Cervantes, J, Chaikovska, I, Chakrabortty, J, Chala, M, Chamizo-Llatas, M, Chanal, H, Chanal, D, Chance, S, Chance, A, Charitos, P, Charles, J, Charles, TK, Chattopadhyay, S, Chehab, R, Chekanov, SV, Chen, N, Chernoded, A, Chetvertkova, V, Chevalier, L, Chiarelli, G, Chiarello, G, Chiesa, M, Chiggiato, P, Childers, JT, Chmielinska, A, Cholakian, A, Chomaz, P, Chorowski, M, Chou, W, Chrzaszcz, M, Chyhyrynets, E, Cibinetto, G, Ciftci, AK, Ciftci, R, Cimino, R, Ciuchini, M, Clark, PJ, Coadou, Y, Cobal, M, Coccaro, A, Cogan, J, Cogneras, E, Collamati, F, Colldelram, C, Collier, P, Collot, J, Contino, R, Conventi, F, Cook, CTA, Cooley, L, Corcella, G, Cornell, AS, Corral, GH, Correia-Rodrigues, H, Costanza, F, Pinto, P Costa, Couderc, F, Coupard, J, Craig, N, Crespo Garrido, I, Crivellin, A, Croteau, JF, Crouch, M, Alaniz, E Cruz, Cure, B, Curti, J, Curtin, D, Czech, M, Dachauer, C, D'Agnolo, RT, Daibo, M, Dainese, A, Dalena, B, Daljevec, A, Dallapiazza, W, Schwartzentruber, L D'Aloia, Dam, M, D'Ambrosio, G, Das, SP, DasBakshi, S, da Silva, W, da Silveira, GG, D'Auria, V, D'Auria, S, David, A, Davidek, T, Deandrea, A, de Blas, J, Debono, CJ, De Curtis, S, De Filippis, N, de Florian, D, Deghaye, S, de Jong, SJ, Del Bo, C, Del Duca, V, Delikaris, D, Deliot, F, Dell'Acqua, A, Delle Rose, L, Delmastro, M, De Lucia, E, Demarteau, M, Denegri, D, Deniau, L, Denisov, D, Denizli, H, Denner, A, d'Enterria, D, de Rijk, G, De Roeck, A, Derue, F, Deschamps, O, Descotes-Genon, S, Dev, PSB, de Regie, JB de Vivie, Dewanjee, RK, Di Ciaccio, A, Di Cicco, A, Dillon, BM, Di Micco, B, Di Nezza, P, Di Vita, S, Doblhammer, A, Dominjon, A, D'Onofrio, M, Dordei, F, Drago, A, Draper, P, Drasal, Z, Drewes, M, Duarte, L, Dubovyk, I, Duda, P, Dudarev, A, Dudko, L, Duellmann, D, Duenser, M, du Pree, T, Durante, M, Yildiz, H Duran, Dutta, S, Duval, F, Duval, JM, Dydyshka, Y, Dziewit, B, Eisenhardt, S, Eisterer, M, Ekelof, T, El Khechen, D, Ellis, SA, Ellis, J, Ellison, JA, Elsener, K, Elsing, M, Enari, Y, Englert, C, Eriksson, H, Eskola, KJ, Esposito, LS, Etisken, O, Etzion, E, Fabbricatore, P, Falkowski, A, Falou, A, Faltova, J, Fan, J, Fano, L, Farilla, A, Farinelli, R, Farinon, S, Faroughy, DA, Fartoukh, SD, Faus-Golfe, A, Fawcett, WJ, Felici, G, Felsberger, L, Ferdeghini, C, Fernandez Navarro, AM, Fernandez-Tellez, A, Troitino, J Ferradas, Ferrara, G, Ferrari, R, Ferreira, L, da Silva, P Ferreira, Ferrera, G, Ferro, F, Fiascaris, M, Fiorendi, S, Fiorio, C, Fischer, O, Fischer, E, Flieger, W, Florio, M, Fonnesu, D, Fontanesi, E, Foppiani, N, Foraz, K, Forkel-Wirth, D, Forte, S, Fouaidy, M, Fournier, D, Fowler, T, Fox, J, Francavilla, P, Franceschini, R, Franchino, S, Franco, E, Freitas, A, Fuks, B, Furukawa, K, Furuseth, SV, Gabrielli, E, Gaddi, A, Galanti, M, Gallo, E, Ganjour, S, Gao, J, Diaz, V Garcia, Perez, M Garcia, Garcia Tabares, L, Garion, C, Garzelli, MV, Garzia, I, Gascon-Shotkin, SM, Gaudio, G, Gay, P, Ge, S-F, Gehrmann, T, Genest, MH, Gerard, R, Gerigk, F, Gerwig, H, Giacomelli, P, Giagu, S, Gianfelice-Wendt, E, Gianotti, F, Giffoni, F, Gilardoni, SS, Costa, M Gil, Giovannetti, M, Giovannozzi, M, Giubellino, P, Giudice, GF, Giunta, A, Gladilin, LK, Glukhov, S, Gluza, J, Gobbi, G, Goddard, B, Goertz, F, Golling, T, Goncalves, VP, Netto, D Goncalves, Goncalo, R, Gomez, LA Gonzalez, Zadeh, S Gorgi, Gorine, G, Gorini, E, Gourlay, SA, Gouskos, L, Grancagnolo, F, Grassellino, A, Grau, A, Graverini, E, Gray, HM, Greco, M, Grenard, J-L, Grimm, O, Grojean, C, Gromov, VA, Grosse-Oetringhaus, JF, Grudiev, A, Grzanka, K, Gu, J, Guadagnoli, D, Guidi, V, Guiducci, S, Canton, G Guillermo, Gunaydin, YO, Gupta, R, Gupta, RS, Gutierrez, J, Gutleber, J, Guyot, C, Guzey, V, Gwenlan, C, Haberstroh, C, Hacisahinoglu, B, Haerer, B, Hahn, K, Hahn, T, Hammad, A, Han, C, Hance, M, Hannah, A, Harris, PC, Hati, C, Haug, S, Hauptman, J, Haurylavets, V, He, H-J, Hegglin, A, Hegner, B, Heinemann, K, Heinemeyer, S, Helsens, C, Henriques, A, Hernandez, P, Hernandez-Pinto, RJ, Hernandez-Sanchez, J, Herzig, T, Hiekkanen, I, Hillert, W, Hoehn, T, Hofer, M, Hofle, W, Holdener, F, Holleis, S, Holzer, B, Hong, DK, Honorato, CG, Hopkins, SC, Hrdinka, J, Hug, F, Humann, B, Humer, H, Hurth, T, Hutton, A, Iacobucci, G, Ibarrola, N, Iconomidou-Fayard, L, Ilyina-Brunner, K, Incandela, J, Infantino, A, Ippolito, V, Ishino, M, Islam, R, Ita, H, Ivanovs, A, Iwamoto, S, Iyer, A, Bermudez, S Izquierdo, Jadach, S, Jamin, DO, Janot, P, Jarry, P, Jeff, A, Jenny, P, Jensen, E, Jensen, M, Jiang, X, Jimenez, JM, Jones, MA, Jones, OR, Jowett, JM, Jung, S, Kaabi, W, Kado, M, Kahle, K, Kalinovskaya, L, Kalinowski, J, Kamenik, JF, Kannike, K, Kara, SO, Karadeniz, H, Karaventzas, V, Karpov, I, Kartal, S, Karyukhin, A, Kashikhin, V, Behr, J Katharina, Kaya, U, Keintzel, J, Keinz, PA, Keppel, K, Kersevan, R, Kershaw, K, Khanpour, H, Khatibi, S, Yanehsari, M Khatiri, Khoze, VV, Kieseler, J, Kilic, A, Kilpinen, A, Kim, Y-K, Kim, DW, Klein, U, Klein, M, Kling, F, Klinkenberg, N, Kloeppel, S, Klute, M, Klyukhin, VI, Knecht, M, Kniehl, B, Kocak, F, Koeberl, C, Kolano, AM, Kollegger, A, Kolodziej, K, Kolomiets, AA, Komppula, J, Koop, I, Koppenburg, P, Koratzinos, M, Kordiaczynska, M, Korjik, M, Kortner, O, Kostka, P, Kotlarski, W, Kotnig, C, Kottig, T, Kotwal, AV, Kovalenko, AD, Kowalski, S, Kozaczuk, J, Kozlov, GA, Kozub, SS, Krainer, AM, Kramer, T, Kraemer, M, Krammer, M, Krasnov, AA, Krauss, F, Kravalis, K, Kretzschmar, L, Kriske, RM, Kritscher, H, Krkotic, P, Kroha, H, Kucharczyk, M, Kuday, S, Kuendig, A, Kuhlmann, G, Kulesza, A, Kumar, M, Kusina, A, Kuttimalai, S, Kuze, M, Kwon, T, Lackner, F, Lackner, M, La Francesca, E, Laine, M, Lamanna, G, La Mendola, S, Lancon, E, Landsberg, G, Langacker, P, Lange, C, Langner, A, Lankford, AJ, Lansberg, JP, Lari, T, Laycock, PJ, Lebrun, P, Lechner, A, Lee, K, Lee, S, Lee, R, Lefevre, T, Le Guen, P, Lehtinen, T, Leith, SB, Lenzi, P, Leogrande, E, Leonidopoulos, C, Leon-Monzon, I, Lerner, G, Leroy, O, Lesiak, T, Levai, P, Leveratto, A, Levichev, E, Li, G, Li, S, Li, R, Liberati, D, Liepe, M, Lissauer, DA, Liu, Z, Lobko, A, Locci, E, Agaliotis, E Logothetis, Lombardo, MP, Long, AJ, Lorin, C, Losito, R, Louzguiti, A, Low, I, Lucchesi, D, Lucchini, MT, Luciani, A, Lueckhof, M, Lunt, AJG, Luzum, M, Lyubimtsev, DA, Maggiora, M, Magnin, N, Mahmoud, MA, Mahmoudi, F, Maitre, J, Makarenko, V, Malagoli, A, Malcles, J, Malgeri, L, Mallon, PJ, Maltoni, F, Malvezzi, S, Malyshev, OB, Mancinelli, G, Mandrik, P, Manfrinetti, P, Mangano, M, Manil, P, Mannelli, M, Marchiori, G, Marhauser, F, Mariani, V, Marinozzi, V, Mariotto, S, Marquard, P, Marquet, C, Marriott-Dodington, T, Martin, R, Martin, O, Camalich, J Martin, Martinez, T, Bruzual, H Martinez, Martinez-Hernandez, MI, Martins, DE, Marzani, S, Marzocca, D, Marzola, L, Masciocchi, S, Masina, I, Massimiliano, A, Massironi, A, Masubuchi, T, Matveev, VA, Mazzoni, MA, McCullough, M, McIntosh, PA, Meade, P, Medina, L, Meier, A, Meignan, J, Mele, B, Mendes Saraiva, JG, Menez, F, Mentink, M, Meoni, E, Meridiani, P, Merk, M, Mermod, P, Mertens, V, Mether, L, Metral, E, Migliorati, M, Milanese, A, Milardi, C, Milhano, G, Militsyn, BL, Millet, F, Minashvili, I, Minervini, JV, Miralles, LS, Mirarchi, D, Mishima, S, Missiaen, DP, Mitselmakher, G, Mitsuhashi, T, Mnich, J, Najafabadi, M Mohammadi, Mohapatra, RN, Mokhov, N, Molson, JG, Monge, R, Montag, C, Montagna, G, Monteil, S, Montenero, G, Montesinos, E, Moortgat, F, Morange, N, Morello, G, Llacer, M Moreno, Moretti, M, Moretti, S, Morley, AK, Moros, A, Morozov, I, Morretta, V, Morrone, M, Mostacci, A, Muanza, S, Muchnoi, N, Muehlegger, M, Mulder, M, Mulders, M, Mueller, B, Mueller, F, Mueller, A-S, Munilla, J, Murray, MJ, Muttoni, Y, Myers, S, Mylona, M, Nachtman, J, Nakamoto, T, Nardecchia, M, Nardini, G, Nason, P, Nergiz, Z, Nesterenko, AV, Nettstraeter, A, Neubuser, C, Neundorf, J, Niccoli, F, Nicrosini, O, Nie, Y, Niedermayer, U, Niedziela, J, Niemi, A, Nikitin, SA, Nisati, A, No, JM, Nonis, M, Nosochkov, Y, Novak, M, Novokhatski, A, O'Callaghan, JM, Ochando, C, Ogur, S, Ohmi, K, Oide, K, Okorokov, VA, Okumura, Y, Oleari, C, Olness, FI, Onel, Y, Ortino, M, Osborne, J, Osland, P, Otto, T, Oyulmaz, KY, Ozansoy, A, Ozcan, V, Ozdemir, K, Pagliarone, CE, da Silva, HF Pais, Palmieri, E, Palumbo, L, Pampaloni, A, Pan, R-Q, Panareo, M, Panella, O, Panico, G, Panizzo, G, Pankov, AA, Pantsyrny, V, Papadopoulos, CG, Papaefstathiou, A, Papaphilippou, Y, Parker, MA, Parma, V, Pasquali, M, Patra, SK, Patterson, R, Paukkunen, H, Pauss, F, Peggs, S, Penttinen, J-P, Peon, G, Perepelkin, EE, Perez, E, Perez, JC, Perez, G, Perez, F, Codina, E Perez, Perez Morales, J, Perfilov, M, Pernegger, H, Peruzzi, M, Pes, C, Peters, K, Petracca, S, Petriello, F, Pezzotti, L, Pfeiffer, S, Piccinini, F, Pieloni, T, Pierini, M, Pikhartova, H, Pikurs, G, Pilicer, E, Piminov, P, Pira, C, Pittau, R, Placzek, W, Plagge, M, Plehn, T, Pleier, M-A, Ploskon, M, Podeur, M, Podlech, H, Podzorny, T, Poggioli, L, Poiron, A, Polesello, G, Lener, M Poli, Polini, A, Polinski, J, Polozov, SM, Ponce, L, Pont, M, Pontecorvo, L, Portaluri, T, Potamianos, K, Prasse, C, Prausa, M, Preinerstorfer, A, Premat, E, Price, T, Primavera, M, Prino, F, Prioli, M, Proudfoot, J, Provino, A, Pugnat, T, Pukhaeva, N, Pulawski, S, Pulikowski, D, Punzi, G, Putti, M, Pyarelal, A, Quack, H, Quispe, M, Racioppi, A, Rafique, H, Raginel, V, Raidal, M, Ramirez-Uribe, NS, Ramsey-Musolf, MJ, Rata, R, Ratoff, P, Ravotti, F, Rebello Teles, P, Reboud, M, Redaelli, S, Renner, E, Renteria-Olivo, AE, Rescigno, M, Reuter, J, Ribon, A, Ricci, AM, Riegler, W, Riemann, S, Riemann, B, Riemann, T, Rifflet, JM, Rimmer, RA, Rinaldesi, R, Rinolfi, L, Rubiras, O Rios, Risselada, T, Rivetti, A, Rivkin, L, Rizzo, T, Robens, T, Robert, F, Robson, AJ, Rochepault, E, Roda, C, Rodrigo, G, Rodriguez-Cahuantzi, M, Rogan, C, Roig, M, Rojas-Torres, S, Rojo, J, Rolandi, G, Rolando, G, Roloff, P, Romanenko, A, Romanov, A, Roncarolo, F, Rosado Sanchez, A, Rosaz, G, Rossi, L, Rossi, A, Rossmanith, R, Rousset, B, Royon, C, Ruan, X, Ruehl, I, Ruhlmann-Kleider, V, Ruiz, R, Rumyantsev, L, Ruprecht, R, Ryazanov, AI, Saba, A, Sadykov, R, de Jauregui, D Saez, Sahin, M, Sailer, B, Saito, M, Sala, F, Salam, GP, Salfeld-Nebgen, J, Salgado, CA, Salini, S, Sallese, JM, Salmi, T, Salzburger, A, Sampayo, OA, Sanfilippo, S, Santiago, J, Santopinto, E, Santoro, R, Sanz Ull, A, Sarasola, X, Sarpun, IH, Sauvain, M, Savelyeva, S, Sawada, R, Sborlini, GFR, Schaffer, A, Schaumann, M, Schenk, M, Scheuerlein, C, Schienbein, I, Schlenga, K, Schmickler, H, Schmidt, R, Schoerling, D, Schoeerner-Sadenius, T, Schoning, A, Schott, M, Schulte, D, Schwaller, P, Schwanenberger, C, Schwemling, P, Schwerg, N, Scibile, L, Sciuto, A, Scomparin, E, Sebastiani, C, Seeber, B, Segreti, M, Selva, P, Selvaggi, M, Senatore, C, Senol, A, Serin, L, Serluca, M, Serra, N, Seryi, A, Sestini, L, Sfyrla, A, Shaposhnikov, M, Shaposhnikova, E, Sharkov, BY, Shatilov, D, Shelton, J, Shiltsev, V, Shipsey, IP, Shirkov, GD, Shivaji, A, Shwartz, D, Sian, T, Sidorov, S, Silvestrini, L, Simand, N, Simon, F, Singh, BK, Siodmok, A, Sirois, Y, Sirtori, E, Sirvinskaite, R, Sitar, B, Sjoestrand, T, Skands, P, Skordis, E, Skovpen, K, Skrzypek, M, Slade, E, Slavich, P, Slovak, R, Smaluk, V, Smirnov, V, Snoeys, W, Soffi, L, Sollander, P, Solovyanov, O, Soltveit, HK, Song, H, Sopicki, P, Sorbi, M, Spallino, L, Spannowsky, M, Spataro, B, Sphicas, P, Spiesberger, H, Spiller, P, Spira, M, Srivastava, T, Stachel, J, Stakia, A, Stanyard, JL, Starchenko, E, Starikov, AY, Stasto, AM, Statera, M, Steerenberg, R, Steggemann, J, Stenvall, A, Stivanello, F, Stockinger, D, Stoel, LS, Stoeger-Pollach, M, Strauss, B, Stuart, M, 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A, Papaphilippou, Y, Parker, M, Parma, V, Pasquali, M, Patra, S, Patterson, R, Paukkunen, H, Pauss, F, Peggs, S, Penttinen, J, Peón, G, Perepelkin, E, Perez, E, Perez, J, Perez, G, Pérez, F, Perez Codina, E, Perez Morales, J, Perfilov, M, Pernegger, H, Peruzzi, M, Pes, C, Peters, K, Petracca, S, Petriello, F, Pezzotti, L, Pfeiffer, S, Piccinini, F, Pieloni, T, Pierini, M, Pikhartova, H, Pikurs, G, Pilicer, E, Piminov, P, Pira, C, Pittau, R, Płaczek, W, Plagge, M, Plehn, T, Pleier, M, Płoskoń, M, Podeur, M, Podlech, H, Podzorny, T, Poggioli, L, Poiron, A, Polesello, G, Poli Lener, M, Polini, A, Polinski, J, Polozov, S, Ponce, L, Pont, M, Pontecorvo, L, Portaluri, T, Potamianos, K, Prasse, C, Prausa, M, Preinerstorfer, A, Premat, E, Price, T, Primavera, M, Prino, F, Prioli, M, Proudfoot, J, Provino, A, Pugnat, T, Pukhaeva, N, Puławski, S, Pulikowski, D, Punzi, G, Putti, M, Pyarelal, A, Quack, H, Quispe, M, Racioppi, A, Rafique, H, Raginel, V, Raidal, M, Ramírez-Uribe, N, Ramsey-Musolf, M, Rata, R, Ratoff, P, Ravotti, F, Rebello Teles, P, Reboud, M, Redaelli, S, Renner, E, Rentería-Olivo, A, Rescigno, M, Reuter, J, Ribon, A, Ricci, A, Riegler, W, Riemann, S, Riemann, B, Riemann, T, Rifflet, J, Rimmer, R, Rinaldesi, R, Rinolfi, L, Rios Rubiras, O, Risselada, T, Rivetti, A, Rivkin, L, Rizzo, T, Robens, T, Robert, F, Robson, A, Rochepault, E, Roda, C, Rodrigo, G, Rodríguez-Cahuantzi, M, Rogan, C, Roig, M, Rojas-Torres, S, Rojo, J, Rolandi, G, Rolando, G, Roloff, P, Romanenko, A, Romanov, A, Roncarolo, F, Rosado Sanchez, A, Rosaz, G, Rossi, L, Rossi, A, Rossmanith, R, Rousset, B, Royon, C, Ruan, X, Ruehl, I, Ruhlmann-Kleider, V, Ruiz, R, Rumyantsev, L, Ruprecht, R, Ryazanov, A, Saba, A, Sadykov, R, Saez de Jauregui, D, Sahin, M, Sailer, B, Saito, M, Sala, F, Salam, G, Salfeld-Nebgen, J, Salgado, C, Salini, S, Sallese, J, Salmi, T, Salzburger, A, Sampayo, O, Sanfilippo, S, Santiago, J, Santopinto, E, Santoro, R, Sanz Ull, A, Sarasola, X, Sarpün, I, Sauvain, M, Savelyeva, S, Sawada, R, Sborlini, G, Schaffer, A, Schaumann, M, Schenk, M, Scheuerlein, C, Schienbein, I, Schlenga, K, Schmickler, H, Schmidt, R, Schoerling, D, Schöerner-Sadenius, T, Schoning, A, Schott, M, Schulte, D, Schwaller, P, Schwanenberger, C, Schwemling, P, Schwerg, N, Scibile, L, Sciuto, A, Scomparin, E, Sebastiani, C, Seeber, B, Segreti, M, Selva, P, Selvaggi, M, Senatore, C, Senol, A, Serin, L, Serluca, M, Serra, N, Seryi, A, Sestini, L, Sfyrla, A, Shaposhnikov, M, Shaposhnikova, E, Sharkov, B, Shatilov, D, Shelton, J, Shiltsev, V, Shipsey, I, Shirkov, G, Shivaji, A, Shwartz, D, Sian, T, Sidorov, S, Silvestrini, L, Simand, N, Simon, F, Singh, B, Siódmok, A, Sirois, Y, Sirtori, E, Sirvinskaite, R, Sitar, B, Sjöstrand, T, Skands, P, Skordis, E, Skovpen, K, Skrzypek, M, Slade, E, Slavich, P, Slovak, R, Smaluk, V, Smirnov, V, Snoeys, W, Soffi, L, Sollander, P, Solovyanov, O, Soltveit, H, Song, H, Sopicki, P, Sorbi, M, Spallino, L, Spannowsky, M, Spataro, B, Sphicas, P, Spiesberger, H, Spiller, P, Spira, M, Srivastava, T, Stachel, J, Stakia, A, Stanyard, J, Starchenko, E, Starikov, A, Staśto, A, Statera, M, Steerenberg, R, Steggemann, J, Stenvall, A, Stivanello, F, Stöckinger, D, Stoel, L, Stöger-Pollach, M, Strauss, B, Stuart, M, Stupakov, G, Su, S, Sublet, A, Sugita, K, Sulak, L, Sullivan, M, Sultansoy, S, Sumida, T, Suzuki, K, Sylva, G, Syphers, M, Sznajder, A, Taborelli, M, Tahir, N, Takeuchi, M, Tal Hod, E, Tambasco, C, Tanaka, J, Tang, K, Tapan, I, Taroni, S, Tartarelli, G, Tassielli, G, Tavian, L, Taylor, T, Taylor, G, Teixeira, A, Tejeda-Muñoz, G, Telnov, V, Tenchini, R, ten Kate, H, Terashi, K, Tesi, A, Testa, M, Tetrel, C, Teytelman, D, Thaler, J, Thamm, A, Thomas, S, Tiirakari, M, Tikhomirov, V, Tikhonov, D, Timko, H, Tisserand, V, Tkachenko, L, Tkaczuk, J, Tock, J, Todd, B, Todesco, E, Tomás Garcia, R, Tommasini, D, Tonelli, G, Toral, F, Torims, T, Torre, R, Townsend, Z, Trant, R, Treille, D, Trentadue, L, Tricoli, A, Tricomi, A, Trischuk, W, Tropin, I, Tuchming, B, Tudora, A, Turbiarz, B, Turk Cakir, I, Turri, M, Tydecks, T, Usovitsch, J, Uythoven, J, Vaglio, R, Valassi, A, Valchkova, F, Valdivia Garcia, M, Valente, P, Valente, R, Valente-Feliciano, A, Valentino, G, Vale Silva, L, Valet, J, Valizadeh, R, Valle, J, Vallecorsa, S, Vallone, G, van Leeuwen, M, van Rienen, U, van Riesen-Haupt, L, Varasteh, M, Vecchi, L, Vedrine, P, Velev, G, Veness, R, Ventura, A, Venturini Delsolaro, W, Verducci, M, Verhaaren, C, Vernieri, C, Verweij, A, Verwilligen, O, Viazlo, O, Vicini, A, Viehhauser, G, Vignaroli, N, Vignolo, M, Vitrano, A, Vivarelli, I, Vlachos, S, Vogel, M, Vogt, D, Völkl, V, Volkov, P, Volpini, G, von Ahnen, J, Vorotnikov, G, Voutsinas, G, Vysotsky, V, Wagner, U, Wallny, R, Wang, L, Wang, R, Wang, K, Ward, B, Watson, T, Watson, N, Ws, Z, Weiland, C, Weinzierl, S, Welsch, C, Wenninger, J, Widorski, M, Wiedemann, U, Wienands, H, Wilkinson, G, Williams, P, Winter, A, Wohlfahrt, A, Wojtoń, T, Wollmann, D, Womersley, J, Woog, D, Wu, X, Wulzer, A, Yanehsari, M, Yang, G, Yang, H, Yao, W, Yazgan, E, Yermolchik, V, Yilmaz, A, Yoo, H, Yost, S, You, T, Young, C, Yu, T, Yu, F, Zaborowska, A, Zadeh, S, Zahnd, M, Zanetti, M, Zanotto, L, Zawiejski, L, Zeiler, P, Zerlauth, M, Zernov, S, Zevi Dell Porta, G, Zhang, Z, Zhang, Y, Zhang, C, Zhang, H, Zhao, Z, Zhong, Y, Zhou, J, Zhou, D, Zhuang, P, Zick, G, Zimmermann, F, Zinn-Justin, J, Zivkovic, L, Zlobin, A, Zobov, M, Zupan, J, and Zurita, J
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lepton ,Physics of Elementary Particles and Fields ,large hadron collider ,engineering ,hadron collider ,costs ,lepton colliders ,FCC-hh ,Mathematics and natural science: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP] ,electroweak measurements ,missing energy ,neutrino mass ,FCC ,accelerator: technology ,Settore FIS/01 ,new physics ,Physics ,Settore FIS/01 - Fisica Sperimentale ,technology [accelerator] ,double-beta decay ,Future colliders ,FCC-ee, CERN, Cost-benefit analysis ,Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici ,energy: upgrade ,CERN LHC Coll ,cryogenics ,FCC-ee: The Lepton Collider ,luminosity: high ,niobium: tin ,performance ,e(+)e(-) collisions ,VIOLATION ,design [accelerator] ,high [luminosity] ,tin [niobium] ,Socio-culturale ,bhabha scattering ,higgs-boson ,LARGE HADRON COLLIDER ,DOUBLE-BETA DECAY ,E(+)E(-) COLLISIONS ,FLAVOR ,ELECTROWEAK MEASUREMENTS ,BHABHA SCATTERING ,MISSING ENERGY ,SINGLE-PHOTON ,NEUTRINO MASS ,HIGGS-BOSON ,fysikk ,ddc:530 ,accelerator: design ,activity report ,superconductivity [magnet] ,electron positron ,FCC-ee ,magnet: superconductivity ,sensitivity ,single-photon ,upgrade [energy] ,flavor violation - Abstract
European physical journal special topics 228(2), 261-623 (2019). doi:10.1140/epjst/e2019-900045-4, Published by Springer, Berlin ; Heidelberg
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- 2019
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19. The KLOE-2 Inner Tracker: Detector commissioning and operation
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Paolo Ciambrone, D. Di Domenici, Eryk Czerwiński, G. Felici, Gianfranco Morello, E. De Lucia, Alessandro Di Cicco, A. Balla, P. Branchini, and G. Bencivenni
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Physics ,Nuclear and High Energy Physics ,GEM ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,business.industry ,Detector ,Tracking system ,Tracking (particle physics) ,01 natural sciences ,Particle detector ,Optics ,Application-specific integrated circuit ,gaseous detectors ,0103 physical sciences ,Calibration ,Measuring instrument ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,010306 general physics ,business ,Instrumentation ,MPGD ,Bhabha scattering - Abstract
The KLOE-2 experiment started its data taking campaign in November 2014 with an upgraded tracking system including an Inner Tracker built with the cylindrical GEM technology, to operate together with the Drift Chamber improving the apparatus tracking performance. The Inner Tracker is composed of four cylindrical triple-GEM, each provided with an X–V strips-pads stereo readout and equipped with the GASTONE ASIC developed inside the KLOE-2 collaboration. Although GEM detectors are already used in high energy physics experiment, this device is considered a frontier detector due to its cylindrical geometry: KLOE-2 is the first experiment to use this novel solution. The results of the detector commissioning, detection efficiency evaluation, calibration studies and alignment, both with dedicated cosmic-ray muon and Bhabha scattering events, will be reported.
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- 2017
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20. Polarized NLO EW e+e− cross section calculations with ReneSANCe-v1.0.0
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Renat Sadykov and Vitaly Yermolchyk
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Physics ,Particle physics ,Generator (category theory) ,Monte Carlo method ,Electroweak interaction ,General Physics and Astronomy ,01 natural sciences ,010305 fluids & plasmas ,Numerical integration ,Standard Model ,Hardware and Architecture ,0103 physical sciences ,Perturbation theory ,010306 general physics ,Event generator ,Bhabha scattering - Abstract
In this paper we present a new Monte Carlo event generator ReneSANCe for simulation of processes at electron–positron colliders. In the current release of the generator the Bhabha scattering ( e + e − → e − e + ) and Higgs-strahlung ( e + e − → Z H ) process are implemented. Based on the SANC (Support for Analytic and Numeric Calculations for experiments at colliders) modules, the new generator takes into account complete one-loop and some higher-order electroweak radiative corrections with finite particle masses and polarizations. The new generator effectively operates in the collinear region and at the Z H production threshold. It is constructed in such a way that new processes can be easily added. The paper contains a theoretical description of the SANC approach, numerical validations and manual. Program summary Program Title: ReneSANCe-v1.0.0 Program Files doi: http://dx.doi.org/10.17632/wp36f7t3ft.1 Licensing provisions: GPLv3 Programming language: Fortran, C, C++ Supplementary material: Looptools [1], FOAM [2] Nature of problem: Theoretical calculations at next-to-leading order in perturbation theory allow to compute higher precision amplitudes for Standard Model processes and decays, provided proper treatments of UV divergences and IR singularities are performed. Solution method: Numerical integration of the precomputed differential expressions for cross sections of certain processes implemented as SANC modules [3,4]. Restrictions: The list of processes is limited to e + e − → e − e + and e + e − → Z H . References: [1] T. Hahn and M. Perez-Victoria, Comput. Phys. Commun. 118 (1999) 153–165, hep-ph/9807565 [2] S. Jadach, Comput.Phys.Commun. 152 (2003) 55-100, hep-ph/0203033 [3] A. Andonov, A. Arbuzov, D. Bardin, et al., Comput.Phys.Commun. 181 (2010) 305–312, arXiv:0812.4207 [4] D. Bardin et al., Phys. Rev. D 98, 013001, arXiv:1801.00125
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- 2020
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21. The KLOE-2 e+ e− tagging for two-photon physics
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F. Curciarello
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Physics ,Luminosity (scattering theory) ,Calorimeter (particle physics) ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Detector ,Scintillator ,01 natural sciences ,030218 nuclear medicine & medical imaging ,Nuclear physics ,03 medical and health sciences ,0302 clinical medicine ,0103 physical sciences ,Radiative transfer ,Two-photon physics ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Instrumentation ,Mathematical Physics ,Lepton ,Bhabha scattering - Abstract
One goal of the KLOE-2 experiment, at the Frascati φ-factory, is to study e+e− → γ*γ*e+e−→ π0 e+e− processes by tagging final state leptons with two scintillator hodoscopes in Roman pots on the DAΦNE beam line. The High Energy Tagger (HET) counting rate is dominated by radiative Bhabha scattering events without any associated signal in the KLOE detector. By comparison with the KLOE luminosity measurement, the radiative Bhabha cross section per scintillator can be measured, in order to monitor detector performance and infer acceptance × efficiency of the HET. The π0 production from two-photon fusion is tagged by requiring the coincidence between the HET and the KLOE detectors when two clusters in the KLOE calorimeter are associated to the same bunch crossing in DAΦNE. HET performance, data stability studies, very low angle radiative Bhabha cross section measurement, and updates on γ*γ*→ π0 search are presented.
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- 2020
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22. The Resonant Effect of an Annihilation Channel in the Interaction of the Ultrarelativistic Electron and Positron in the Field of an X-ray Pulsar
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D. V. Doroshenko, Victor V. Dubov, and Sergei P. Roshchupkin
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electron ,Physics ,lcsh:QC793-793.5 ,Annihilation ,Bhabha scattering ,Field (physics) ,X-ray field ,Astrophysics::High Energy Astrophysical Phenomena ,lcsh:Elementary particle physics ,General Physics and Astronomy ,Electron ,Threshold energy ,01 natural sciences ,Resonance (particle physics) ,Nuclear physics ,Positron ,Pulsar ,0103 physical sciences ,positron ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Oleinik resonances ,010306 general physics ,010303 astronomy & astrophysics - 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).
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- 2020
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23. A precision luminometer for future linear collider experiments
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Veta Ghenescu
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Physics ,Nuclear and High Energy Physics ,Luminosity (scattering theory) ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Monte Carlo method ,DESY ,01 natural sciences ,030218 nuclear medicine & medical imaging ,Computational physics ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,CMOS ,law ,0103 physical sciences ,Calibration ,Physics::Accelerator Physics ,Collider ,Instrumentation ,Molière radius ,Bhabha scattering - Abstract
The FCAL collaboration develops the technologies of compact and fast calorimeters to measure the luminosity at Linear Collider experiments both with high precision using small angle Bhabha scattering, and bunch-by-bunch using beamstrahlung pairs. Beside the luminosity measurement, the capability of detecting high energy electrons at low angles is important for many search experiments. A small Moliere radius facilitates the measurement of Bhabha events in the presence of background and allows the detection of single high energy electrons on top of the widely spread background of beamstrahlung. A multi-plane prototype of a compact precision luminometer was studied in an electron beam with energies between 1 and 5 GeV at DESY. The results for the longitudinal and the transverse shower profiles are compared with Geant4 simulations of the setup. Very good agreement was obtained. The effective Moliere radius of the prototype was determined. Again, very good agreement between data and Monte Carlo simulations was found. The value of the Moliere radius approached the technological limit. A dedicated multi-channel ultra-low power readout ASIC is under development in 130 nm CMOS, comprising an analogue front-end and fast 10-bit ADC in each channel, followed by fast serialization and data transmission. In addition, an ASIC with a dual readout scheme allowing for a fast feedback to the accelerator and simultaneous data taking and calibration is under development. The paper summarizes the results on design optimization, beam-tests and the status of the readout ASICs.
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- 2020
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24. QED and electroweak radiative corrections to polarized Bhabha scattering
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L. V. Kalinovskaya, Ya. Dydyshka, Andrej Arbuzov, S. G. Bondarenko, Renat Sadykov, and L A Rumyantsev
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Physics ,History ,Particle physics ,Electroweak interaction ,Radiative transfer ,High Energy Physics::Experiment ,Computer Science Applications ,Education ,Bhabha scattering - Abstract
Complete one-loop electroweak radiative corrections to polarized Bhabha scattering are presented. Numerical results are shown for the conditions of future circular and linear electron-positron colliders with polarized beams. A new Monte Carlo event generator for simulation of Bhabha scattering is created. Higher order QED collinear radiation factors are evaluated in the next-to-leading logarithmic approximation.
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- 2020
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25. The The Bhabha Scattering in the Randall-sundrum Model
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Le Nhu Thuc
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Physics ,Particle physics ,Randall–Sundrum model ,Bhabha scattering - Abstract
The change in other two fermion processes is called Bhabha process. In this paper, we discuss the Bhabha process in the Randall –Sundrum (RS). We caculated the cross section for photon , boson Z, radion and Higgs h exchange and evaluated exchange contributions of the Bhabha process in detail. Keywords: DCS, cross-section, Bhabha, radion, Randall-Sundrum. References [1] L. Randall and R. Sundrum, Phys. Rev. Lett. 83, 3370, 1999.[2] H. Davoudiasl, T. McElmurry and A. Soni, Phys. Rev. D82, 115028, 2010.[3] V. P. Goncalves and W. K. Sauter, Phys. Rev. D82, 056009, 2010. [4] W. -J. Zhang, W. -G. Ma, R. -Y. Zhang, X. -Z. Li, L. Guo, and C. Chen, Phys. Rev. D92, 116005, 2015, [arXiv:1512.01766].[5] C. Cai, Z.-H. Yu and H.-H. Zhang, Phys. Rev. D93. 075033, 2016.[6] F. Abu-Ajamieh, R. Houtz, and R. Zheng, [arXiv: 1607.01464v1 [hep-ph]], 2016.[7] The CMS Collaboration, CERN, August 2016.[8] The CMS Collaboration, CERN, September 2016.[9] F. Richard, [ arXiv:1804.02846 [hep-ex]], 2018.
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- 2018
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26. Electroweak radiative corrections to polarized Bhabha scattering
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Yahor Dydyshka, L. Rumyantsev, Dmitri Bardin, S. G. Bondarenko, Lidia Kalinovskaya, Renat Sadykov, and Andrej Arbuzov
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Physics ,Particle physics ,Scattering ,media_common.quotation_subject ,Relative correction ,Electroweak interaction ,Radiative transfer ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Polarization (waves) ,Asymmetry ,media_common ,Bhabha scattering - Abstract
In this report we present theoretical predictions for high-energy Bhabha scattering with taking into account complete one-loop electroweak radiative corrections. Longitudinal polarization of the initial beams is assumed. Numerical results for the left-right asymmetry and the relative correction to the distribution in the scattering angle are shown. The results are relevant for several future electron-positron collider projects.
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- 2018
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27. Status of the KLOE-2 Inner Tracker
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Erika De Lucia
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Physics ,Muon ,Interaction point ,010308 nuclear & particles physics ,business.industry ,Physics::Instrumentation and Detectors ,Interface (computing) ,QC1-999 ,Gigabit Ethernet ,Detector ,01 natural sciences ,Optics ,Application-specific integrated circuit ,0103 physical sciences ,Calibration ,High Energy Physics::Experiment ,010306 general physics ,business ,Bhabha scattering - Abstract
KLOE-2 at the DAΦNE Φ-factory is the main experiment of the INFN Laboratori Nazionali di Frascati (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea developed at LNF. Four concentric cylindrical triple-GEM detectors compose the Inner Tracker, inserted around the interaction region and before the inner wall of the pre-existing KLOE Drift Chamber to improve the resolution on decay vertices close to the interaction point. State-of-the-art solutions have been expressly developed or tuned for this project: single-mask GEM etching, multi-layer XV patterned readout, PEEK spacer grid, GASTONE front-end board, a custom 64-channel ASIC with digital output, and the Global Interface Board for data collection, with a configurable FPGA architecture and Gigabit Ethernet. Alignment and calibration of a cylindrical GEM detector was never done before and represents one of the challenging activities of the experiment. The Inner Tracker detector construction, operation, calibration and performance obtained with cosmic-ray muons and Bhabha scattering events will be reported.
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- 2018
28. Measurement of the integrated Luminosities of cross-section scan data samples around the φ(3770) mass region
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Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., F. F., An, An, Q., Bai, Y., Bakina, O., Baldini Ferroli, R., Ban, Y., Begzsuren, K., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chang, W. L., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, P. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Cossio, F., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dou, Z. L., S. X., Du, Duan, P. F., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., C. D., Fu, Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garillon, B., Garzia, I., Gilman, A., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., L. M., Gu, M. H., Gu, Y. T., Gu, Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Guskov, A., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., K. L., He, X. Q., He, Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., H. M., Hu, J. F., Hu, Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Ikegami Andersson, W., Irshad, M., Ji, Q., Q. P., Ji, X. B., Ji, X. L., Ji, Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. S., Kavatsyuk, M., B. C., Ke, Khan, T., Khoukaz, A., Kiese, P., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuessner, M., Kupsc, A., Kurth, M., Kühn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leiber, S., Leithoff, H., Li, C., Cheng, Li, D. M., Li, Li, F., F. Y., Li, Li, G., H. B., Li, H. J., Li, J. C., Li, J. W., Li, K. J., Li, Kang, Li, Ke, Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, Li, T., W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Li, Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Liao, L. Z., Libby, J., Lin, C. X., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, D. Y., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. L., Liu, H. M., Liu, Huanhuan, Liu, Huihui, Liu, J. B., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., H. J., Lu, J. G., Lu, Lu, Y., Y. P., Lu, Luo, C. L., Luo, M. X., Luo, X. L., Lusso, S., Lyu, X. R., F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, X. N., Ma, X. Y., Ma, Y. M., Ma, Maas, F. E., Maggiora, M., Malik, Q. A., Mangoni, A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., X. H., Mo, Y. J., Mo, Morales Morales, C., Morello, G., Muchnoi, N. Yu, Muramatsu, H., Mustafa, A., Nakhoul, S., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Papenbrock, M., Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peng, Z. Y., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Pitka, A., Poling, R., Prasad, V., H. R., Qi, Qi, M., T. Y., Qi, Qian, S., Qiao, C. F., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rolo, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrié, M., Schnier, C., Schoenning, K., Shan, W., Shan, X. Y., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Shi, X., Song, J. J., Song, W. M., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tan, Y. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, C. W., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, Meng, Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. Y., Wang, Zongyuan, Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., L. H., Wu, L. J., Wu, Wu, Z., Xia, L., Xia, X., Xia, Y., Xiao, D., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., G. F., Xu, J. J., Xu, Xu, L., Q. J., Xu, Q. N., Xu, X. P., Xu, Yan, F., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, S. L., Yang, Y. H., Yang, Y. X., Yang, Yifan, Ye, M., M. H., Ye, Yin, J. H., You, Z. Y., B. X., Yu, C. X., Yu, J. S., Yu, Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zallo, A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. F., Zhang, T. J., Zhang, X. Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yang, Zhang, Yao, Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, Q., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, A. N., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zou, B. S., Zou, J. H., and Research unit Nuclear & Hadron Physics
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Particle physics ,Nuclear and High Energy Physics ,01 natural sciences ,Resonance (particle physics) ,Measure (mathematics) ,NO ,High Energy Physics - Experiment ,law.invention ,Subatomär fysik ,Cross section (physics) ,Astronomi, astrofysik och kosmologi ,law ,Bhabha scattering events ,0103 physical sciences ,Subatomic Physics ,Astronomy, Astrophysics and Cosmology ,ddc:530 ,BESIII ,integrated luminosity ,Instrumentation ,Astronomy and Astrophysics ,010306 general physics ,Collider ,Astrophysics::Galaxy Astrophysics ,Bhabha scattering ,Physics ,Luminosity (scattering theory) ,010308 nuclear & particles physics ,Detector ,Branching Fraction ,High Energy Physics::Experiment ,Energy (signal processing) - Abstract
Chinese physics / C High energy physics and nuclear physics C 42(6), 063001 (2018). doi:10.1088/1674-1137/42/6/063001, To investigate the nature of the $\psi(3770)$ resonance and to measure the cross section for $e^+e^- \to D\bar{D}$, a cross-section scan data sample, distributed among 41 center-of-mass energy points from 3.73 to 3.89~GeV, was taken with the BESIII detector operated at the BEPCII collider in the year 2010. By analyzing the large angle Bhabha scattering events, we measure the integrated luminosity of the data sample at each center-of-mass energy point. The total integrated luminosity of the data sample is $76.16\pm0.04\pm0.61$~pb$^{-1}$, where the first uncertainty is statistical and the second systematic., Published by IOP Publ., Bristol [u.a.]
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- 2018
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29. Calibration of the calorimeter signal waveform in the SND detector
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V. V. Zhulanov, Alexander Bogdanchikov, I. K. Surin, D. P. Kovrizhin, V. P. Druzhinin, A.I. Tekut'ev, M. N. Achasov, Yu. V. Usov, S.V. Koshuba, and Aleksandr Korol
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Physics ,Nuclear and High Energy Physics ,Calorimeter (particle physics) ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,business.industry ,Detector ,Calorimetry ,01 natural sciences ,Signal ,Optics ,Amplitude ,0103 physical sciences ,Calibration ,Waveform ,High Energy Physics::Experiment ,Nuclear Experiment ,010306 general physics ,business ,Instrumentation ,Bhabha scattering - Abstract
The new spectrometric channel for the Spherical Neutral Detector (SND) electromagnetic calorimeter (EMC) is described. It provides measurement of the calorimeter signal arrival time and amplitude with 1 ns and 250 keV resolutions, respectively. The new electronics is useful for reliable detection of low-speed anti-neutrons from the e + e − → n n reaction near threshold and needed for increasing the EMC operation rate. The algorithm of determination of signal parameters (time, amplitude) is based on invariability of the signal waveform. We present the procedure of the waveform calibration using signals from cosmic-muon and Bhabha scattering events.
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- 2019
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30. A new approach to evaluate the leading hadronic corrections to the muon g-2
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M. Passera, Luca Trentadue, G. Venanzoni, and C. M. Carloni Calame
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Physics ,Nuclear and High Energy Physics ,Particle physics ,Muon ,Scattering ,Hadron ,FOS: Physical sciences ,Particle source ,lcsh:QC1-999 ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Electromagnetic coupling ,Statistical analysis ,High Energy Physics::Experiment ,lcsh:Physics ,Bhabha scattering - Abstract
We propose a novel approach to determine the leading hadronic corrections to the muon g-2. It consists in a measurement of the effective electromagnetic coupling in the space-like region extracted from Bhabha scattering data. We argue that this new method may become feasible at flavor factories, resulting in an alternative determination potentially competitive with the accuracy of the present results obtained with the dispersive approach via time-like data., 7 pages, 3 figures. Version accepted for publication in Phys. Lett. B
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- 2015
31. One-loop electroweak radiative corrections to polarized Bhabha scattering
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D. Y. Bardin, L. Rumyantsev, Ya. Dydyshka, Lidia Kalinovskaya, Renat Sadykov, Andrej Arbuzov, and S. G. Bondarenko
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Physics ,Particle physics ,010308 nuclear & particles physics ,media_common.quotation_subject ,Electroweak interaction ,Relative correction ,FOS: Physical sciences ,Observable ,Polarization (waves) ,01 natural sciences ,Asymmetry ,Computer Science::Digital Libraries ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Radiative transfer ,High Energy Physics::Experiment ,010306 general physics ,Bhabha scattering ,media_common - Abstract
Theoretical predictions for Bhabha scattering observables are presented including complete one-loop electroweak radiative corrections. A longitudinal polarization of the initial beams is taken into account. Numerical results for the asymmetry $A_{LR}$ and the relative correction $\delta$ are given for the set of the energy $E_{cm}=250, 500, 1000$~GeV with various polarization degrees., Comment: 7 pages, 7 figures, 2 tables, svjour style; some numbers and figures are corrected
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- 2017
32. Concept of a low energy electron-positron collider for dimuonium study
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Eugene Levichev, Sergej Sinyatkin, Vladimir Druzhinin, A. I. Milstein, and Anton Bogomyagkov
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Momentum ,Physics ,Particle physics ,Luminosity (scattering theory) ,law ,Hadron ,Bound state ,Production (computer science) ,Collider ,Energy (signal processing) ,Bhabha scattering ,law.invention - Abstract
We discuss a low energy collider for production of the not yet discovered $\mu^+\mu^-$ bound state (dimuonium). In our design we follow the Brodsky-Lebed proposal of the large-crossing-angle $e^+e^-$ intersection, when the dimuonium carries non-zero momentum and decays to $e^+e^-$ pair far away from the beam collision region. The latter provides effective suppression of the Bhabha scattering background. We study experimental constraints and following requirements for the collider development. A preliminary layout is considered, the main parameters are obtained. The expected peak luminosity at the $\mu^+\mu^-$ production threshold is $8\times10^{31} cm^{-2}s^{-1}$. The same machine can be used for high statistic study of hadronic processes ($e^+e^-\to \pi^+\pi^-,\, \pi^+\pi^-\pi^0,\, \pi^0\gamma$ etc.) and search for rare processes in the center-of-mass energy range below 960 MeV.
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- 2017
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33. Corrigendum to 'Two-loop Bhabha scattering at high energy beyond leading power approximation' [Phys. Lett. B 760 (2016) 816]
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Nikolai Zerf and Alexander A. Penin
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Physics ,Nuclear and High Energy Physics ,High energy ,01 natural sciences ,lcsh:QC1-999 ,Loop (topology) ,Power approximation ,Quantum mechanics ,Quantum electrodynamics ,0103 physical sciences ,ddc:530 ,010306 general physics ,lcsh:Physics ,Bhabha scattering - Published
- 2017
34. Lorentz violation in Bhabha scattering at finite temperature
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A. F. Santos and Faqir C. Khanna
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Physics ,010308 nuclear & particles physics ,CPT symmetry ,Lorentz transformation ,Physics beyond the Standard Model ,01 natural sciences ,symbols.namesake ,Lorentz factor ,Quantum electrodynamics ,Quantum mechanics ,0103 physical sciences ,symbols ,Field theory (psychology) ,010306 general physics ,Bhabha scattering - Published
- 2017
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35. Latest Results from The Olympus Experiment
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Axel William Schmidt
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Elastic scattering ,Physics ,Nuclear physics ,Positron ,Proton ,Radiative transfer ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,DESY ,Electron ,Lepton ,Bhabha scattering - Abstract
The two experimental techniques for determining the proton's elastic form factors---unpolarized cross section measurements and polarization asymmetries---have yielded strikingly discrepant results. One possible explanation for this discrepancy is that hard two-photon exchange, a radiative correction that is typically neglected, contributes on the percent level to the elastic electron-proton cross section. The OLYMPUS experiment tests this hypothesis by measuring the ratio of positron-proton to electron-proton elastic scattering cross sections. Deviations in this ratio from unity are a signature of hard two-photon exchange. The OLYMPUS experiment took place at DESY, in Hamburg, Germany, and over 4 fb$^{-1}$ of integrated luminosity were acquired by the end of data taking in 2013. 2~GeV electron and positron beams, alternating daily, were directed through a windowless hydrogen gas target. Scattered leptons and recoiling protons were detected in coincidence in a toroidal magnetic spectrometer simultaneously over a wide range of angles. The relative luminosity between electron and positron modes was monitored redundantly through rates of both forward elastic and symmetric Moller/Bhabha scattering. The latest results from the OLYMPUS analysis will be presented.
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- 2017
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36. A novel technique for determining luminosity in electron-scattering/positron-scattering experiments from multi-interaction events
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Ross Milner, C. O'Connor, Jan C. Bernauer, and Alexander Schmidt
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Physics ,Elastic scattering ,Accelerator Physics (physics.acc-ph) ,Nuclear and High Energy Physics ,Physics - Instrumentation and Detectors ,Luminosity (scattering theory) ,010308 nuclear & particles physics ,Scattering ,FOS: Physical sciences ,Electron ,Instrumentation and Detectors (physics.ins-det) ,01 natural sciences ,Nuclear physics ,Positron ,0103 physical sciences ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,High Energy Physics::Experiment ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Instrumentation ,Electron scattering ,Storage ring ,Bhabha scattering - Abstract
The OLYMPUS experiment measured the cross-section ratio of positron–proton elastic scattering relative to electron–proton elastic scattering to look for evidence of hard two-photon exchange. To make this measurement, the experiment alternated between electron beam and positron beam running modes, with the relative integrated luminosities of the two running modes providing the crucial normalization. For this reason, OLYMPUS had several redundant luminosity monitoring systems, including a pair of electromagnetic calorimeters positioned downstream from the target to detect symmetric Moller and Bhabha scattering from atomic electrons in the hydrogen gas target. Though this system was designed to monitor the rate of events with single Moller/Bhabha interactions, we found that a more accurate determination of relative luminosity could be made by additionally considering the rate of events with both a Moller/Bhabha interaction and a concurrent elastic e p interaction. This method was improved by small corrections for the variance of the current within bunches in the storage ring and for the probability of three interactions occurring within a bunch. After accounting for systematic effects, we estimate that the method is accurate in determining the relative luminosity to within 0.36%. This precise technique can be employed in future electron–proton and positron–proton scattering experiments to monitor relative luminosity between different running modes.
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- 2017
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37. Measurement of integrated luminosity and center-of-mass energy of data taken by BESIII at
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J. F. Sun, S. Marcello, Y. Zeng, J. F. Chang, S. Han, J. Min, Zhiqing Liu, Magnus Wolke, Y. F. Liang, D. P. Jin, L. H. Wu, B. Kopf, Xiaofeng Zhu, J. Z. Zhang, M. Savrie, Orhan Cakir, P. Kiese, K. L. He, N. Yu. Muchno, K. Goetzen, Yaquan Fang, L. Xia, S. L. Olsen, Y. X. Xia, S. H. Zhu, Dayong Wang, N. Qin, L. J. Wu, Y. J. Mo, H. Y. Shen, R. Farinelli, X. S. Jiang, X. Q. Hao, S. Schumann, G. Cibinetto, Bibo Ke, Q. Ouyang, F. De Mori, H. S. Chen, T. Weber, X. Liu, H. R. Qi, Serkant Ali Cetin, Yao Wang, H. L. Ma, Xiao-Rui Lyu, Xiaozhong Huang, S. S. Fang, Y. B. Liu, H. L. Dai, Jie Zhao, D. X. Lin, M. Albrecht, G. R. Liao, J. F. Hu, X. Y. Zhou, R. Kliemt, X. Y. Jiang, M. M. Ma, J. C. Chen, P. R. Li, G. S. Varner, G. Cheng, Q. P. Ji, Liqing Xu, J. H. Liu, A. Dbeyssi, Ke Wang, W. B. Yan, Giulietto Felici, S. Pacetti, Jin Li, Y. J. Mao, H. X. Yang, I. Garzia, D. M. Li, H. M. Hu, Q An, X. F. Wang, Q. M. Ma, Jie Yu, T. J. Min, Zahra Haddadi, S. L. Niu, F. Y. Li, Andrzej Kupsc, W. L. Yuan, Peilian Liu, Lingxuan Zhang, B. Kloss, X. Y. Niu, Y. Pan, J. Chai, G. X. Sun, K. J. Zhu, X. Q. Li, Y. F. Long, M. Greco, Y. Yuan, Y. S. Zhu, M. Bertani, Z. Jiao, Fu-Hu Liu, D. H. Zhang, L. Zotti, X. Y. Shen, J. W. Zhang, M. Pelizaeus, S. Qian, Jialun Ping, A. Amoroso, K. Zhang, X. Y. Zhang, M. Lara, J. B. Liu, Y. J. Sun, Q. Liu, X. D. Ruan, Y. P. Lu, L. L. Ma, L. Gong, Jun-Yi Zhang, Y. P. Guo, P. F. Duan, Zhiyong Zhang, Chi Zhang, P. L. Wang, Y. Ding, L. G. Xia, B. J. Liu, S. Jin, G. F. Cao, Z. P. Zhang, D. Y. Liu, J. B. Jiao, S. Q. Zhang, C. Leng, Guangshun Huang, L. Yan, H. P. Chen, S. Ahmed, Y. X. Yang, A. A. Zafar, X. Fang, D. Bettoni, X. L. Ji, W. Kühn, K. Y. Liu, H. B. Li, Y. H. Guan, M. Y. Dong, Z. B. Li, D. W. Bennett, Zujian Wang, Tord Johansson, M. Tiemens, Z. Y. You, Z. A. Zhu, B. L. Wang, R. A. Briere, A. Julin, Y. F. Wang, Y. Guo, J. V. Bennett, Z. L. Huang, K. H. Rashid, Z. Ning, Feng Liu, I. Uman, Y. H. Zheng, Cong-Feng Qiao, K. Schoenning, Q. Y. Li, B. S. Zou, O. Albayrak, C. P. Shen, H. J. Li, X. B. Ji, Y. B. Zhao, H. B. Liu, W. Shan, I. Tapan, J. Dong, A. Yun, Kai Liu, Q. L. Xiu, T. C. Zhao, T. Hussain, M. G. Zhao, R. P. Guo, M. Z. Wang, Y. H. Yan, Yanwei Wang, C. L. Luo, P. Patteri, Y. Q. Wang, Jimin Zhao, Klaus Peters, X. Y. Ma, W. X. Gong, Y. T. Liang, X. S. Kang, S. Nisar, Huihui Liu, Y. G. Xie, J. P. Liu, C. J. Tang, Y. Hu, J. H. Zou, X. Y. Song, F. Bianchi, X. L. Luo, J. W. Zhao, M. H. Gu, Y. H. Zhang, F. A. Harris, Niklaus Berger, O. Fedorov, Bingxuan Liu, Y. Nefedov, Y. N. Zhang, X. Cai, S. X. Du, G. Li, P. Larin, S. J. Chen, A. Hafner, M. Ablikim, Q. Zhao, Dmitri Dedovich, Z. L. Dou, B. Wang, Y. Z. Sun, C. C. Zhang, S. S. Sun, S. Z. Chen, Tao Luo, D. Xiao, J. J. Xu, Z. J. Xiao, M. Maggiora, Ling Zhao, W. P. Wang, Lei Zhao, Z. Y. Wang, Yi Chen, C. D. Fu, X. K. Chu, C. Q. Feng, X. R. Chen, J. G. Messchendorp, Qiunan Xu, M. Shi, C. X. Yu, H. Leithoff, F. Li, B. Zhong, L. B. Guo, E. H. Thorndike, J. M. Bian, X. H. Sun, S. J. Zhao, Z. L. Hou, X. N. Ma, Y. C. Zhu, B. X. Yu, Zhi Zeng, J. Q. Zhang, Xiang Zhou, H. Cai, Xingguo Li, Y. B. Li, A. Zallo, L. Q. Qin, J. Z. Bai, F. Feldbauer, F. C. Ma, Gang Zhao, B. Zheng, R. G. Ping, F. F. An, Z. T. Sun, J. S. Huang, C. X. Liu, Z. H. Wang, H. Muramatsu, W. G. Li, X. C. Chen, Q. A. Malik, G. Mezzadri, W. C. Yan, C. Z. Yuan, Y. Ban, T. Holtmann, H. J. Lu, J. G. Lu, Igor Boyko, Z. A. Liu, J. Y. Liu, J. F. Qiu, M. Fritsch, V. Prasad, Ulrich Wiedner, P. Musiol, Q. J. Xu, R. E. Mitchell, C. F. Redmer, Xiaocong Ai, M. Kornicer, M. Kavatsyuk, P. Weidenkaff, F. H. Heinsius, L. Fava, Yu Zhang, F. Nerling, M. N. Achasov, F. E. Maas, T. Hu, S. Spataro, X. P. Xu, Y. Y. Liu, C. Schnier, Nasser Kalantar-Nayestanaki, C. Morales Morales, S. P. Wen, K. Li, X. T. Huang, X. S. Qin, X. R. Zhou, X. K. Zhou, Fang Liu, T. Ma, L. Yang, R. Baldini Ferroli, Cheng Li, L. P. Zhou, Y. M. Ma, H. Xiao, E. Boger, T. Held, Q. Gao, Y. N. Gao, I. Denysenko, Y. Zhang, G. Rong, B. X. Zhang, Z. G. Wang, P. X. Shen, J. Z. Fan, A. Zhemchugov, H. Y. Zhang, Lei Li, Z. Wu, H. M. Liu, Z. Y. Deng, L. W. Jiang, Z. P. Mao, O. B. Kolcu, Gueorgui Chelkov, X. N. Li, Haiping Peng, X. C. Lou, Zhiqing Zhang, J. C. Li, B. Y. Zhang, J. Fang, Tao Li, Z. Gao, A. Calcaterra, Ch. Rosner, W. Gradl, D. J. Ambrose, J. Zhuang, H. Liang, M. Ripka, I. B. Nikolaev, W. M. Song, J. Y. Zhang, A. Denig, D. Y. Wang, M. X. Luo, M. Qi, Yucheng Huang, H. J. Yang, Z. H. Qin, Y. K. Heng, W. D. Li, M. L. Chen, J. P. Dai, Cui Li, Z. G. Zhao, S. B. Liu, H. H. Zhang, Z. J. Sun, H. Loehner, C. Hu, X. Tang, Yunlong Zhang, J. L. Zhang, R. Poling, Jianping Zheng, S. Zhu, X. H. Mo, L. S. Wang, M. H. Ye, J. J. Zhang, M. Destefanis, X. L. Gao, L. L. Wang, C. Dong, S. Sosio, Joachim Pettersson, L. D. Liu, L. Y. Dong, G. F. Xui, W. J. Zheng, Q. Guo, J. H. Yin, M. Shao, Y. T. Gu, E. Fioravanti, X. L. Kang, A. Sarantsev, D. H. Wei, J. S. Lange, and Q. W. Zhao
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Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,Astrophysics::High Energy Astrophysical Phenomena ,01 natural sciences ,law.invention ,Nuclear physics ,law ,0103 physical sciences ,ddc:530 ,Nuclear Experiment ,010306 general physics ,Collider ,Instrumentation ,Astrophysics::Galaxy Astrophysics ,Bhabha scattering ,Physics ,Luminosity (scattering theory) ,010308 nuclear & particles physics ,Detector ,Astronomy and Astrophysics ,Collision ,Data set ,High Energy Physics::Experiment ,Center of mass ,Astrophysics::Earth and Planetary Astrophysics ,Energy (signal processing) - Abstract
Chinese physics / C 41(11), 113001 (2017). doi:10.1088/1674-1137/41/11/113001, To study the nature of the state $Y(2175)$, a dedicated data set of $e^+e^-$ collision data was collected at the center-of-mass energy of 2.125 GeV with the BESIII detector at the BEPCII collider. By analyzing large-angle Bhabha scattering events, the integrated luminosity of this data set is determined to be $108.49\pm0.02\pm0.85$ pb$^{-1}$, where the first uncertainty is statistical and the second one is systematic. In addition, the center-of-mass energy of the data set is determined with radiative dimuon events to be $2126.55\pm0.03\pm0.85$ MeV, where the first uncertainty is statistical and the second one is systematic., Published by IOP Publ., Bristol [u.a.]
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- 2017
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38. Luminosity measurements for the R scan experiment at BESIII
- Author
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Ablikim, M., Achasov, M. N., Bai, J. Z., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Bakina, O., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Andersson, W. Ikegami, Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, L. W., Ferroli, R. Baldini, Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Ban, Y., Kang, X. S., Kavatsyuk, M., Ke, B. C., Kiese, P., Kliemt, R., Kloss, B., Kolcu, O. B., Kopf, B., Kornicer, M., Kupsc, A., Bennett, D. W., Kuhn, W., Lange, J. S., Lara, M., Larin, P., Leithoff, H., Leng, C., Li, C., Li, Cheng, Li, D. M., Li, F., Bennett, J. V., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, K., Li, Lei, Li, P. R., Berger, N., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Y. B., Li, Z. B., Liang, H., Bertani, M., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Bettoni, D., Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. M., Liu, J., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Bian, J. M., Liu, K. Y., Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Y. Y., Liu, Z. A., Liu, Zhiqing, Ahmed, S., Bianchi, F., Loehner, H., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Boger, E., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Boyko, I., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Briere, R. A., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Nefedov, Y., Nerling, F., Nikolaev, I. B., Cai, H., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Patteri, P., Pelizaeus, M., Cai, X., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Cakir, O., Qiao, C. F., Qin, L. Q., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Ripka, M., Rong, G., Calcaterra, A., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrie, M., Schnier, C., Schoenning, K., Shan, W., Shao, M., Shen, C. P., Shen, P. X., Cao, G. F., Shen, X. Y., Sheng, H. Y., Song, W. M., Song, X. Y., Sosio, S., Spataro, S., Sun, G. X., Sun, J. F., Sun, S. S., Sun, X. H., Cetin, S. A., Sun, Y. J., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, X., Tapan, I., Thorndike, E. H., Tiemens, M., Uman, I., Ai, X. C., Chai, J., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Chang, J. F., Wang, P. L., Wang, W., Wang, W. P., Wang, X. F., Wang, Y., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Chelkov, G., Wang, Z. H., Wang, Z. Y., Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., Wu, L. H., Chen, G., Wu, L. J., Wu, Z., Xia, L., Xia, L. G., Xia, Y., Xiao, D., Xiao, H., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Chen, H. S., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Chen, J. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Chen, M. L., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Chen, S., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Chen, S. J., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y., Zhang, Y. H., Zhang, Y. N., Zhang, Y. T., Chen, X., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Albayrak, O., Chen, X. R., Zhao, M. G., Zhao, Q., Zhao, Q. W., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Chen, Y. B., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, K., Zhu, K. J., Chu, X. K., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., Zou, J. H., Cibinetto, G., BESIII Collaboration, Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Albrecht, M., Denysenko, I., Destefanis, M., DeMori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dou, Z. L., Du, S. X., Ambrose, D. J., Duan, P. F., Fan, J. Z., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Feldbauer, F., Felici, G., Amoroso, A., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Z., Garzia, I., Goetzen, K., An, F. F., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guan, Y. H., Guo, A. Q., Guo, L. B., Guo, R. P., An, Q., Guo, Y., Guo, Y. P., Haddadi, Z., Hafner, A., Han, S., Hao, X. Q., Harris, F. A., He, K. L., Heinsius, F. H., Held, T., Research unit Nuclear & Hadron Physics, and BESIII Collaboration
- Subjects
Particle physics ,Nuclear and High Energy Physics ,Astrophysics::High Energy Astrophysical Phenomena ,Bhabha ,diphoton ,luminosity ,R value ,Instrumentation ,Astronomy and Astrophysics ,FOS: Physical sciences ,7. Clean energy ,01 natural sciences ,Resonance (particle physics) ,law.invention ,High Energy Physics - Experiment ,NO ,Subatomär fysik ,High Energy Physics - Experiment (hep-ex) ,law ,0103 physical sciences ,Subatomic Physics ,EVENT GENERATOR ,ddc:530 ,010306 general physics ,Collider ,Bhabha scattering ,Physics ,Luminosity (scattering theory) ,FLAVOR FACTORIES ,Spectrometer ,010308 nuclear & particles physics ,R-value (insulation) ,Physics - Data Analysis, Statistics and Probability ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Energy (signal processing) ,Data Analysis, Statistics and Probability (physics.data-an) ,luminosity, Bhabha, diphoton, R value - Abstract
Kolcu, Onur Buğra (Arel Author), By analyzing the large-angle Bhabha scattering events e(+)e(-) -> (gamma)e(+)e(-) and diphoton events e(+)e(-) -> (gamma)gamma gamma for the data sets collected at center-of-mass (c.m.) energies between 2.2324 and 4.5900 GeV (131 energy points in total) with the upgraded Beijing Spectrometer (BESIII) at the Beijing Electron-Positron Collider (BEPCII), the integrated luminosities have been measured at the different c.m. energies, individually. The results are important inputs for the R value and J/Psi resonance parameter measurements.
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- 2017
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39. Beam-Gas and Beam-Thermal photon scattering in CEPC
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Bai, Sha, Gao, Jie, Geng, Huiping, Wang, Dou, Wang, Yiwei, Yu, Chenghui, and Zhang, Yuan
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Physics ,History ,Photon ,MC1: Circular and Linear Colliders ,Scattering ,Circular Electron Positron Collider ,Accelerator Physics ,Computer Science Applications ,Education ,Standard Model ,Nuclear physics ,Radiative transfer ,Higgs boson ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Beam (structure) ,Bhabha scattering - Abstract
The Circular Electron Positron Collider (CEPC) is a proposed Higgs factory with center of mass energy of 240 GeV to measure the properties of Higgs boson and test the standard model accurately. Beam loss background in detectors is an important topic at CEPC. Beam-Gas scattering (BG) and Beam-Thermal photon scattering (BTH), although not so serious as Radiative Bhabha scattering (RBB) and Beamstrahlung (BS), are also important components of the beam induced backgrounds at CEPC due to the beam lifetime. In this paper, we evaluated the beam-gas and beam-thermal photon scattering in simulation and designed collimators to suppress the radiation level on the machine and the detector., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia
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- 2019
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40. R&D with very forward calorimeters for linear colliders
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Marek Idzik
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Physics ,Luminosity (scattering theory) ,Large Hadron Collider ,International Linear Collider ,Interaction point ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,business.industry ,DESY ,01 natural sciences ,030218 nuclear medicine & medical imaging ,Calorimeter ,03 medical and health sciences ,0302 clinical medicine ,Optics ,0103 physical sciences ,High Energy Physics::Experiment ,business ,Molière radius ,Bhabha scattering - Abstract
The luminosity of the International Linear Collider will be measured by counting Bhabha scattering events, recognized by coincident detection of two low angle electrons in two calorimeters located symmetrically on both sides of the interaction point. The calorimeters are designed as sampling calorimeters with tungsten absorber disks interspersed with silicon sensors. For a precise measurement of the polar angle, it is essential to achieve a small Moliere radius. The design thus foresees ultra-thin sensors that allow 1 mm spacing between the absorbers. In 2014, a first multi-layer prototype of the calorimeter was tested in a beam of 5 GeV electrons and muons at CERN. Excellent performance of the sensors was demonstrated. The development of electron showers has been measured and compared to simulations. Good agreement is found. In the next step, different connectivity schemes have been explored allowing to reach sensor module thickness below 1 mm. Eight thin sensor layers, fully equipped with front-end electronics, have been succesfully tested in a 5 GeV electron beam at DESY. In parallel, the development of a novel ultra-low power SoC type front-end ASIC called FLAME has been started. Prototypes of its two main blocks have been designed, fabricated, and partially tested.
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- 2016
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41. The KLOE-2 cylindrical GEM inner tracker: Detector operation, calibration and performance
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J. Dong, D. Domenici, M. Gatta, A. Balla, A. Pelosi, M. Capodiferro, M. Mongelli, G. Bencivenni, Antonio Budano, Edisher Tskhadadze, S. Cerioni, G. Felici, A. Di Cicco, V. Valentino, Eryk Czerwiński, A. Ranieri, A. Palladino, Gianfranco Morello, N. Lacalamita, P. Fermani, F. Loddo, Paolo Ciambrone, E. De Lucia, G. De Robertis, and P. Branchini
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Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,STRIPS ,01 natural sciences ,Radiation length ,030218 nuclear medicine & medical imaging ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,Optics ,Application-specific integrated circuit ,law ,Nuclear Medicine and Imaging ,0103 physical sciences ,Electronic ,Calibration ,Optical and Magnetic Materials ,Instrumentation ,Bhabha scattering ,Physics ,Luminosity (scattering theory) ,010308 nuclear & particles physics ,business.industry ,Detector ,Gigabit Ethernet ,Electrical engineering ,Radiology, Nuclear Medicine and Imaging ,Electronic, Optical and Magnetic Materials ,High Energy Physics::Experiment ,Radiology ,business - Abstract
KLOE-2 at the e+e− DAφNE φ-factory is the main experiment of the INFN Frascati National Laboratories (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea that was developed at LNF exploiting the kapton properties to build a light and compact tracking system. Four concentric cylindrical triple-GEM detectors, for a total material budget below 2% of the radiation length X 0 , are inserted around the interaction region and before the inner wall of the pre-existing KLOE Drift Chamber, at distances from 130 mm to 205 mm. For this project, state-of-the-art solutions have been expressly developed or tuned: single-mask GEM etching, multi-layer XV patterned readout circuit, PEEK spacer grid, GASTONE front-end board, a custom 64-channel ASIC with digital output, and the Global Interface Board for data collection, with a configurable FPGA architecture and Gigabit Ethernet. The dedicated XV strips patterned readout allows space coordinates to be reconstructed. Alignment and calibration of a cylindrical GEM detector was never done before and represents one of the challenging activities of the experiment. During 2015 both KLOE-2 and DAPHNE successfully demonstrated the feasibility of a long term acquisition program with the first data taking campaign, started in November 2014 and ended in July 2015 with 1 fb−1 integrated luminosity. The second new data taking campaign started in September 2015 and KLOE-2 is presently taking data. The Inner Tracker detector operation, calibration and performance will be presented. Preliminary results obtained with cosmic-ray muons and Bhabha scattering events are within expectations for the Inner Tracker resolution.
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- 2016
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42. Two-loop Bhabha scattering at high energy beyond leading power approximation
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Nikolai Zerf and Alexander A. Penin
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Physics ,Nuclear and High Energy Physics ,High energy ,QED ,Bhabha scattering ,Logarithm ,010308 nuclear & particles physics ,Scattering ,Structure (category theory) ,FOS: Physical sciences ,Perturbation theory ,01 natural sciences ,lcsh:QC1-999 ,Loop (topology) ,High Energy Physics - Phenomenology ,Power approximation ,High Energy Physics - Phenomenology (hep-ph) ,Quantum mechanics ,Quantum electrodynamics ,0103 physical sciences ,Perturbation theory (quantum mechanics) ,010306 general physics ,lcsh:Physics - Abstract
We evaluate the two-loop ${\cal O}(m_e^2/s)$ 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., 15 pages, 2 figures, minor correction of the result
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- 2016
43. Search for a Higgs boson decaying into two photons in e(+)e(-) interactions at root s=189 GeV
- Author
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M. Vivargent, D. Piccolo, Vladimir Andreev, R. Ramelli, C. C. Samuel Ting, D.W. Schmitz, P. de Jong, N. Shivarov, R. van Gulik, P. Extermann, Salvatore Mele, Christoph Schäfer, B. Z. Yang, H. Hofer, S. S. Gau, K. L. Tung, Peter Denes, Robert Clare, Lamberto Luminari, Paolo Bagnaia, W. G. Ma, Thomas Hebbeker, G. Ambrosi, M. Rescigno, A. Barczyk, M. Gataullin, T. Sztaricskai, Paul Lecoq, R. W. Kraemer, M. Napolitano, A. Oulianov, C. Palomares, P. Wienemann, Adrian Biland, Egidio Longo, V. Plyaskin, Pierre Lecomte, F. Pierella, Federico Cindolo, A. Stone, Georgi Sultanov, T. S. Dai, R. A. Khan, S. Pensotti, Valery Schegelsky, Antonino Zichichi, C. Dionisi, Nicola Cavallo, H. K. Park, D. Duchesneau, H. S. Chen, L. Servoli, R. Leiste, Christoph Paus, Dimitri Bourilkov, P. Spillantini, Pablo Garcia-Abia, Werner Lustermann, Charles Timmermans, M. Dierckxsens, S. C. Tonwar, H. Rykaczewski, Frank Filthaut, Giovanni Organtini, Alain Hervé, T. Paul, H. Wilkens, G. Castellini, M. Chemarin, A. Bay, Ren-Yuan Zhu, B. Petersen, Thomas Ferguson, A. Malinin, A. Bajo, Alexei Raspereza, M. T. Dova, G. S. Muanza, I. Vodopianov, E. Fiandrini, Igor Vorobiev, J. A. van Dalen, A. Engler, G. M. Chen, G. Forconi, M. Pohl, S. Vlachos, Z. F. Gong, Gyorgy Vesztergombi, Peter Raics, M. Capell, H. S. Fesefeldt, E. Pistolesi, Luca Malgeri, Carlo Civinini, G. Raven, L. Xia, Aaron Dominguez, Jean Fay, M. Aguilar-Benitez, O. Grimm, Felicitas Pauss, Herwig Schopper, M. Pedace, S. C. Blyth, Marco Meschini, J. Rodin, T. Niessen, S. Rosier-Lees, P. Le Coultre, M. Basile, An. Zalite, A. De Salvo, P. Bartalini, A. Krüger, J. G. Branson, Kajari Mazumdar, X. D. Cai, Alessandra Doria, A. Gurtu, S. Villa, P. Duinker, P. Levtchenko, Panos A Razis, Christopher George Tully, S. N. Ganguli, A. Degré, H. Postema, W. J. Burger, Michael Dittmar, M. N. Kienzle-Focacci, A. Seganti, Harvey B Newman, M. Musy, R. Barillère, Jozsef Toth, Claudio Luci, D. Pandoulas, F. C. Erné, Wolfgang Lohmann, H. Vogt, B. Bertucci, F. Anselmo, Nicanor Colino, A. Lebedev, D. Mangeol, D. Luckey, B. Musicar, Roberto Battiston, Gerjan Bobbink, B. Borgia, G. Schwering, A. Csilling, J. Ulbricht, Dong-Chul Son, C. Furetta, M. Lebeau, J.P. Martin, Simonetta Gentile, S. R. Hou, M. Wadhwa, A. Balandras, D. J. Schotanus, K. Freudenreich, B. Tellili, J. Berdugo, J. J. Blaising, Marco Pieri, J. Hirschfelder, Stefano Giagu, J. D. Swain, A. Hasan, Raffaello D'Alessandro, F. Cesaroni, A. Buijs, Leonardo Merola, E. J. Sanchez, Maurizio Biasini, Pierluigi Paolucci, Marta Felcini, Peter H. Fisher, A. Klimentov, L. Lugnier, W. Kittel, I. Clare, G. Cara Romeo, B. P. Roe, S. Reucroft, S. V. Baldew, D. O. Prokofiev, Francesco Becattini, L. Tauscher, X. L. Wang, S. Cucciarelli, M. Pauluzzi, G. Marian, Aleandro Nisati, F. Brochu, C. Maña, D. della Volpe, H. J. Lee, Marcella Diemoz, G. Landi, M. Fabre, Jasper Kirkby, M. A. Falagan, I. Vetlitsky, Giovanni Passaleva, Joseph Quartieri, E. Delmeire, U. K. Chaturvedi, T. Azemoon, M. Zöller, Mingming Yang, H. F. Chen, An.A. Vorobyov, A. Böhm, Simone Paoletti, Y. S. Lu, Riccardo Paramatti, A. Favara, D. Ren, Anna Katharina Kopp, Zheng Wang, H. J. Yang, R. Ofierzynski, P. G. Rancoita, Pàl Hidas, Zhenyu Zhang, A. J.M. Muijs, S. Bhattacharya, L. Baksay, F. Cotorobai, B. De La Cruz, A. Shvorob, R. Ranieri, S. Likhoded, A. Kunin, Marcos Cerrada, B. N. Jin, Manjit Kaur, G. Ruggiero, A. C. Weber, L. Z. Sun, O. Adriani, Z. Szillasi, Hafeez R Hoorani, S. Wynhoff, C-Q. Li, A. Rosca, V. K. Gupta, H. Nowak, G. Chiefari, D. Vicinanza, S. Shevchenko, J. H. Field, Imad Baptiste Laktineh, V. Koutsenko, Lucas Taylor, Francesca Cavallari, M. G. Alviggi, E. Valente, M. E. Sarakinos, F. Behner, Yu. Galaktionov, L. Bellucci, Z. A. Liu, A. Vorvolakos, F. DeNotaristefani, W. J. Metzger, B. Stoyanov, S. Schmidt-Kaerst, T. Angelescu, G. Mirabelli, W. Wallraff, J. Alcaraz, G. Y. Zhu, E. Shumilov, P. Déglon, P. Ladron de Guevara, G. Viertel, S. Banerjee, K. Lübelsmeyer, S. Saremi, J. Casaus, V. Shoutko, K. Sudhakar, Ya Han Hu, D. Haas, Manas Maity, Jeremy Mans, Tariq Aziz, Claudia Cecchi, M. von der Mey, P. Berges, Hans J. Vogel, A. Buffini, A. Mihul, J. B. Ye, G. Alemanni, J. K. Kim, F. L. Linde, C. G. Yang, J. Pothier, Yu. Zalite, M. Acciarri, Guo-Ming Chen, J. M. Le Goff, J. Yamamoto, N. Gheordanescu, W. T. Lin, S. Costantini, S. C. Yeh, J. A. Rubio, A. Chen, D. van Dierendonck, J. Salicio, Crisostomo Sciacca, B. Zimmermann, D. Kiss, Konrad Deiters, G. B. Mohanty, Alberto Aloisio, Ph. Lebrun, X. W. Tang, P. A. Piroué, M. W. Gruenewald, M. Chamizo, I. Josa-Mutuberria, M. Kräber, Dong-Hyun Kim, G. Zilizi, R. Berbeco, A. Arefiev, R. R. McNeil, G. Carlino, G. Holzner, K. Riles, F. Marzano, G. Coignet, W. Krenz, S. X. Wu, Inkyu Park, M. Steuer, M. A. Rahaman, D. Perret-Gallix, D. Prokofiev, Luisa Cifarelli, L. J. Gutay, U. Becker, I. Duran, F. J. Eppling, L. W. Jones, S. M. Ting, J.V. Allaby, S. Patricelli, D. Hatzifotiadou, Laszlo Boldizsar, L. Romero, S. Sarkar, M. Bourquin, G. J. Grenier, Joachim Mnich, P. Achard, H. Milcent, T. Moulik, A. M. Cartacci, A. C. König, D. P. Stickland, Y. H. Chang, Francesca Nessi-Tedaldi, J. D. Burger, T. Siedenburg, G. Rahal-Callot, N. Raja, D. Dufournaud, H. Suter, Ia Iashvili, Z. Z. Xu, C. H. Lin, V. Pojidaev, Y. Uchida, Minhong Wang, M. P. Sanders, B. L. Betev, Speranza Falciano, A. Straessner, Luca Lista, Sabine Riemann, H. Anderhub, Michele Guida, B. Smith, S. Braccini, R. de Asmundis, I. Fisk, H. El Mamouni, Oleg Fedin, Max Weber, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), CMS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), L3, Achard, Pablo, Ambrosi, Giovanni, Bourquin, Maurice, Braccini, Saverio, Chamizo Llatas, Maria, Deglon, Patrick, Delmeire, Evelyne, Extermann, Pierre, Field, John, Kienzle, Maria-Novella, Pohl, Martin, Acciarri, M., Achard, P., Adriani, O., Aguilar Benitez, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, Alberto, Alviggi, Mariagrazia, Ambrosi, G., Anderhub, H., Andreev, V. P., Angelescu, T., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Bajo, A., Baksay, L., Balandras, A., Baldew, S. V., Banerjee, S., Barczyk, A., Barillere, R., Bartalini, P., Basile, M., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Bellucci, L., Berbeco, R., Berdugo, J., Berges, P., Bertucci, B., Betev, B. L., Bhattacharya, S., Biasini, M., Biland, A., Blaising, J. J., Blyth, S. C., Bobbink, G. J., Bohm, A., Boldizsar, L., Borgia, B., Bourilkov, D., Bourquin, M., Braccini, S., Branson, J. G., Brochu, F., Buffini, A., Buijs, A., Burger, J. D., Burger, W. J., Cai, X. D., Capell, M., Romeo, G. C., Carlino, G., Cartacci, A. M., Casaus, J., Castellini, G., Cavallari, F., Cavallo, N., Cecchi, C., Cerrada, M., Cesaroni, F., Chamizo, M., Chang, Y. H., Chaturvedi, U. K., Chemarin, M., Chen, A., Chen, G., Chen, G. M., Chen, H. F., Chen, H. S., Chiefari, Giovanni, Cifarelli, L., Cindolo, F., Civinini, C., Clare, I., Clare, R., Coignet, G., Colino, N., Costantini, S., Cotorobai, F., B. d., La, Csilling, A., Cucciarelli, S., Dai, T. S., Van, J. A., D'Alessandro, R., Asmundis, R. d., Deglon, P., Degre, A., Deiters, K., DELLA VOLPE, Domenico, Delmeire, E., Denes, P., Denotaristefani, F., Salvo, A. D., Diemoz, M., Dierckxsens, M., Dierendonck, D. v., Dionisi, C., Dittmar, M., Dominguez, A., Doria, A., Dova, M. T., Duchesneau, D., Dufournaud, D., Duinker, P., Duran, I., Mamouni, H. E., Engler, A., Eppling, F. J., Erne, F. C., Extermann, P., Fabre, M., Falagan, M. A., Falciano, S., Favara, A., Fay, J., Fedin, O., Felcini, M., Ferguson, T., Fesefeldt, H., Fiandrini, E., Field, J. H., Filthaut, F., Fisher, P. H., Fisk, I., Forconi, G., Freudenreich, K., Furetta, C., Galaktionov, Y., Ganguli, S. N., Garcia Abia, P., Gataullin, M., Gau, S. S., Gentile, S., Gheordanescu, N., Giagu, S., Gong, Z. F., Grenier, G., Grimm, O., Gruenewald, M. W., Guida, M., Gulik, R. v., Gupta, V. K., Gurtu, A., Gutay, L. J., Haas, D., Hasan, A., Hatzifotiadou, D., Hebbeker, T., Herve, A., Hidas, P., Hirschfelder, J., Hofer, H., Holzner, G., Hoorani, H., Hou, S. R., Hu, Y., Iashvili, I., Jin, B. N., Jones, L. W., Jong, P. d., Josa Mutuberria, I., Khan, R. A., Kaur, M., Kienzle Focacci, M. N., Kim, D., Kim, J. K., Kirkby, J., Kiss, D., Kittel, W., Klimentov, A., Konig, A. C., Kopp, A., Koutsenko, V., Kraber, M., Kraemer, R. W., Krenz, W., Kruger, A., Kunin, A., P. L., De, Laktineh, I., Landi, G., Lebeau, M., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Coultre, P. L., Lee, H. J., J. M., Le, Leiste, R., Levtchenko, P., Li, C., Likhoded, S., Lin, C. H., Lin, W. T., Linde, F. L., Lista, L., Liu, Z. A., Lohmann, W., Longo, E., Y. S., Lu, Lubelsmeyer, K., Luci, C., Luckey, D., Lugnier, L., Luminari, L., Lustermann, W., W. G., Ma, Maity, M., Malgeri, L., Malinin, A., Mana, C., Mangeol, D., Mans, J., Marian, G., Martin, J. P., Marzano, F., Mazumdar, K., Mcneil, R. R., Mele, S., Merola, Leonardo, Meschini, M., Metzger, W. J., Der, M. v., Mihul, A., Milcent, H., Mirabelli, G., Mnich, J., Mohanty, G. B., Moulik, T., Muanza, G. S., A. J. M., Musicar, B., Musy, M., Napolitano, Marco, Nessi Tedaldi, F., Newman, H., Niessen, T., Nisati, A., Nowak, H., Ofierzynski, R., Organtini, G., Oulianov, A., Palomares, C., Pandoulas, D., Paoletti, S., Paolucci, P., Paramatti, R., Park, H. K., Park, I. H., Passaleva, G., Patricelli, Sergio, Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Pedace, M., Pensotti, S., Perret Gallix, D., Petersen, B., Piccolo, D., Pierella, F., Pieri, M., Piroue, P. A., Pistolesi, E., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Pothier, J., Prokofiev, D. O., Prokofiev, D., Quartieri, J., Rahal Callot, G., Rahaman, M. A., Raics, P., Raja, N., Ramelli, R., Rancoita, P. G., Ranieri, R., Raspereza, A., Raven, G., Razis, P., Ren, D., Rescigno, M., Reucroft, S., Riemann, S., Riles, K., Rodin, J., Roe, B. P., Romero, L., Rosca, A., Rosier Lees, S., Rubio, J. A., Ruggiero, G., Rykaczewski, H., Saremi, S., Sarkar, S., Salicio, J., Sanchez, E., Sanders, M. P., Sarakinos, M. E., Schafer, C., Schegelsky, V., Schmidt Kaerst, S., Schmitz, D., Schopper, H., Schotanus, D. J., Schwering, G., Sciacca, Crisostomo, Seganti, A., Servoli, L., Shevchenko, S., Shivarov, N., Shoutko, V., Shumilov, E., Shvorob, A., Siedenburg, T., Son, D., Smith, B., Spillantini, P., Steuer, M., Stickland, D. P., Stone, A., Stoyanov, B., Straessner, A., Sudhakar, K., Sultanov, G., Sun, L. Z., Suter, H., Swain, J. D., Szillasi, Z., Sztaricskai, T., Tang, X. W., Tauscher, L., Taylor, L., Tellili, B., Timmermans, C., S. C. C., Ting, S. M., Tonwar, S. C., Toth, J., Tully, C., Tung, K. L., Uchida, Y., Ulbricht, J., Valente, E., Vesztergombi, G., Vetlitsky, I., Vicinanza, D., Viertel, G., Villa, S., Vivargent, M., Vlachos, S., Vodopianov, I., Vogel, H., Vogt, H., Vorobiev, I., Vorobyov, A. A., Vorvolakos, A., Wadhwa, M., Wallraff, W., Wang, M., Wang, X. L., Wang, Z. M., Weber, A., Weber, M., Wienemann, P., Wilkens, H., S. X., Wu, Wynhoff, S., Xia, L., Z. Z., Xu, Yamamoto, J., Yang, B. Z., Yang, C. G., Yang, H. J., Yang, M., J. B., Ye, Yeh, S. C., Zalite, A., Zalite, Y., Zhang, Z. P., Zhu, G. Y., Zhu, R. Y., Zichichi, A., Zilizi, G., Zimmermann, B., and Zoller, M.
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COLLISIONS ,Z boson ,Nuclear and High Energy Physics ,Particle physics ,Photon ,Higgs boson ,L3 data collected at LEP ,Electron–positron annihilation ,STANDARD MODEL ,2 PHOTONS ,FOS: Physical sciences ,ddc:500.2 ,01 natural sciences ,7. Clean energy ,Lower limit ,High Energy Physics - Experiment ,Standard Model ,W-PAIR PRODUCTION ,Nuclear physics ,BHABHA SCATTERING ,High Energy Physics - Experiment (hep-ex) ,0103 physical sciences ,MONTE-CARLO PROGRAM ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,PARTICLES ,TEVATRON ,010306 general physics ,DETECTOR ,Ciencias Exactas ,L3 EXPERIMENT ,Physics ,010308 nuclear & particles physics ,Branching fraction ,High Energy Physics::Phenomenology ,Física ,Function (mathematics) ,Scalar boson ,High Energy Physics::Experiment ,Particle Physics - Experiment - Abstract
A search is performed for a Higgs boson produced in association with a Z boson and decaying into two photons, using the L3 data collected at LEP at a centre-of-mass energy of 189 GeV. All decay modes of the Z are considered. No signal is observed and limits on the branching fraction of the Higgs boson decay into two photons as a function of the Higgs mass are derived assuming a Standard Model production rate. A lower limit on the mass of a fermiophobic Higgs is set at 94.9 GeV at 95% confidence level., Facultad de Ciencias Exactas
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- 2016
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44. NEW RESULTS FROM BHABHA SCATTERING AT 29 GEV
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A. A. Seidl, P. Kesten, B. B. Brabson, C. R. Ng, D.S. Koltick, N. Harnew, F. J. Loeffler, M. Derrick, B. G. Bylsma, C. K. Jung, E. H. Low, R. P. Thun, D. H. Miller, M. Willutzky, J.M. Weiss, D. Nitz, R. Debonte, G. Bonvicini, L. E. Price, D. E. Wood, H. A. Neal, S. W. Gray, D. I. Meyer, D. Errede, J. W. Chapman, J. S. Loos, L. K. Rangan, T. Trinko, P. Kooijman, K. K. Gan, Carl W. Akerlof, P. Baringer, Harold Ogren, D. Blockus, M. Valdata-Nappi, E. I. Shibata, I. Beltrami, R. L. McIlwain, S. Abachi, J. Schlereth, B. Musgrave, B. Cork, K. Sugano, and D. R. Rust
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Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Particle physics ,Range (particle radiation) ,Partial width ,High Energy Physics::Experiment ,Polar coordinate system ,Bhabha scattering ,Boson - Abstract
Results are reported on a high statistics study of Bhabha scattering at 29 GeV in the polar angle region, |cos θ| < 0.55. The data are consistent with the standard model, and measure vector and axial-vector coupling constants of gv2 = 0.03 ± 0.09 and ga2 = 0.46±0.14. Limits on the QED-cutoff parameters are Λ+ > 154 GeV and Λ- > 220 GeV. Lower limits on scale parameters of composite models are in the range 0.9-2.8 TeV. The partial width of a hypothetical spin-zero boson decaying to e+e- has an upper limit which varies from 6 to 57 MeV corresponding to a boson mass in the range 45-80 GeV/c2. © 1986.
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- 2016
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45. AN IMPROVED MEASUREMENT OF ELECTROWEAK COUPLINGS FROM E+E--]E+E- AND E+E--]MU+MU
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K. Lübelsmeyer, H. M. Fischer, Gl Salmon, M. Wollstadt, R. J. Cashmore, T. D. Jones, H. U. Martyn, T. Barklow, Walter Dr. Hillen, D. H. Saxon, D. Trines, E.E. Ronat, W. Koch, G. Peise, H. Siebke, B. Foster, D. M. Binnie, U. Kötz, Guenter Wolf, M. Althoff, D. Notz, G. Poelz, J. McCardle, D. A. Garbutt, T. R. Wyatt, Michael Dittmar, G. Yekutieli, R.C.E. Devenish, Georg Zobernig, A. Jocksch, Y. Eisenberg, G. Knop, W. Braunschweig, T. Kracht, D. Strom, W. Wallraff, H. Hartmann, Hermann Kolanoski, J. K. Sedgbeer, M. Rushton, A. Shapira, Norbert Wermes, K. Gather, A. Ladage, G. Rudolph, H. Kück, H. Kowalski, H. Venkataramania, J. Harvey, J. Proudfoot, R. Wedemeyer, H. Burkhardt, J. Pyrlik, C. Youngman, I. C. Brock, G. Mikenberg, D. K. Hasell, E. Hilger, R. Beuselinck, A. Caldwell, Ch. Xiao, C. Jenkins, Ehud Duchovni, D. Pandoulas, Joseph Izen, M. G. Bowler, D. R. Quarrie, F. J. Kirschfink, M. Holder, P. Grossmann, B. Löhr, H. Hultschig, K. W. Bell, P. Mättig, P. Joos, W. G. Jones, P. L. Woodworth, J. Rimkus, B. H. Wiik, W. Schütte, John Hart, E. Wicklund, Sau Lan Wu, W. A. T. Wan Abdullah, Fernando Barreiro, P. E. L. Clarke, P. Rosskamp, M. Mermikides, D. Revel, R. Mir, Hl Krasemann, L. Köpke, M. Cherney, E. Lohrmann, B. Neumann, H. G. Sander, D.W. Schmitz, U. Karshon, P. J. Dornan, A. J. Campbell, R. Fohrmann, Juergen Thomas, D. Lüke, S. L. Llyod, and P. Leu
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Physics ,Particle physics ,Muon ,Physics and Astronomy (miscellaneous) ,High Energy Physics::Phenomenology ,Electroweak interaction ,Elementary particle ,Weinberg angle ,Fermion ,Nuclear physics ,Pair production ,High Energy Physics::Experiment ,Engineering (miscellaneous) ,Bhabha scattering ,Lepton - Abstract
We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and μ pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry of the μ pairs was measured to be −0.098±0.023±0.005. The data were found to agree well with the standard theory of electroweak interaction giving sin2θW=0.27±0.07. The leptonic weak couplings were determined to begv=0.000±0.170 andgA=−0.481±0.055. The data were also used to investigate a class of composite models for leptons.
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- 2016
46. A measurement of the Tau topological branching ratios
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Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., Alekseev, G. D., Alemany, R., Allmendinger, T., Allport, P. P., Almehed, S., Amaldi, U., Amapane, N., Amato, S., Anashkin, E., Anassontzis, E. G., Andersson, P., Andreazza, A., Andringa, S., Anjos, N., Antilogus, P., Apel, W. D., Arnoud, Y., Asman, B., Augustin, J. -E, Augustinus, A., Baillon, P., Ballestrero, A., Bambade, P., Barao, F., Barbiellini, Guido, Barbier, R., Bardin, D. Yu, Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K. H., Begalli, M., Behrmann, A., Bellunato, T. F., Belokopytov, Yu, Belous, K., Benekos, N. C., Benvenuti, A. C., Berat, C., Berggren, M., Berntzon, L., Bertrand, D., Besancon, M., Besson, N., Bilenkii, M. S., Bloch, D., Blom, H. M., Bol, L., Bonesini, M., Boonekamp, M., Booth, P. S. L., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bowcock, T. J. V., Boyko, I., Bozovic, I., Bracko, M., Branchini, P., Brenner, R. A., Brueckman, P., Brunet, J. M., Bugge, L., Buschmann, P., Caccia, M., Calvi, M., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Castillo-Gimenez, M. V., Cattai, A., Cavallo, F. R., Chapkin, M., Charpentier, P., Checchia, P., Chelkov, G. A., Chierici, R., Shlyapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Cieslik, K., Collins, P., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Costa, M., Crawley, H. B., Crennell, D., Croix, J., Crosetti, G., Cuevas-Maestro, J., Czellar, S., D Hondt, J., Dalmau, J., Davenport, M., Da Silva, W., Della Ricca, G., Delpierre, P. A., Demaria, N., Angelis, A., Boer, W., Clercq, C., Lotto, B., Min, A., Paula, L. S., Dijkstra, H., Di Ciaccio, L., Doroba, K., Dracos, M., Drees, J., Dris, M., Eigen, G., Ekeloef, T., Ellert, M., Elsing, M., Engel, J. P., Espirito-Santo, M. C., Fanourakis, G. K., Fassouliotis, D., Feindt, M., Fernandez, J., Ferrer, A., Ferrer-Ribas, E., Ferro, F., Firestone, A., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B. J., Frodesen, A. G., Fruehwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, P., Gazis, E. N., Gele, D., Geralis, T., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Gonzalez-Caballero, I., Gopal, G., Gorn, L., Guz, Yu, Gracco, V., Grahl, J., Graziani, E., Grosdidier, G., Grzelak, K., Guy, J., Haag, C., Hahn, F., Hahn, S., Haider, S., Hallgren, A., Hamacher, K., Hansen, J., Harris, F. J., Haug, S., Hauler, F., Hedberg, V., Heising, S., Hernandez, J. J., Herquet, P., Herr, H., Hertz, O., Higon, E., Holmgren, S. O., Holt, P. J., Hoorelbeke, S., Houlden, M., Hrubec, J., Hughes, G. J., Hultqvist, K., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, C., Jarlskog, G., Jarry, P., Jean-Marie, B., Jeans, D., Johansson, E. K., Jonsson, P., Joram, C., Juillot, P., Jungermann, L., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E. C., Keraenen, R., Kernel, G., Kersevan, B. P., Khokhlov, Yu, Khomenko, B. A., Khovanskii, N. N., Kiiskinen, A. P., King, B. J., Kinvig, A., Kjaer, N. J., Klapp, O., Kluit, P. M., Kokkinias, P., Kostyukhin, V., Kourkoumelis, C., Kuznetsov, O., Krammer, M., Kriznic, E., Krumshtein, Z., Kubinec, P., Kucharczyk, M., Kurowska, J., Lamsa, J. W., Laugier, J. P., Leder, G., Ledroit, F., Leinonen, L., Leisos, A., Leitner, R., Lenzen, G., Lepeltier, V., Lesiak, T., Lethuillier, M., Libby, J., Liebig, W., Liko, D., Lipniacka, A., Lippi, I., Loken, J. G., Lopes, J. H., Lopez, J. M., Lopez-Fernandez, R., Loukas, D., Lutz, P., Lyons, L., Macnaughton, J., Mahon, J. R., Maio, A., Malek, A., Maltezos, S., Malychev, V., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J. C., Mariotti, C., Markou, A., Martinez-Rivero, C., Marti, I. Garcia S., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, F., Mazzucato, M., Mccubbin, M. L., Mckay, R., Mcnulty, R., Mcpherson, G., Merle, E., Meroni, C., Meyer, W. T., Migliore, E., Mirabito, L., Mitaroff, W. A., Mjoernmark, U., Moa, T., Moch, M., Moenig, K., Monge, M. R., Montenegro, J., Moraes, D., Morettini, P., Morton, G., Mueller, U., Muenich, K., Mulders, M., Mundim, L. M., Murray, W. J., Muryn, B., Myatt, G., Myklebust, T., Nassiakou, M., Francesco Luigi Navarria, Nawrocki, K., Negri, P., Nemecek, S., Neufeld, N., Nicolaidou, R., Niezurawski, P., Nikolenko, M., Nomokonov, V., Nygren, A., Obraztsov, V. F., Olshevskii, A. G., Onofre, A., Orava, R., Oesterberg, K., Ouraou, A., Oyanguren, A., Paganoni, M., Paiano, S., Pain, R., Paiva, R., Palacios, J., Palka, H., Papadopoulou, T. D., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Peralta, L., Perepelitsa, V., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Poireau, V., Pol, M. E., Polok, G., Poropat, P., Pozdnyakov, V., Privitera, P., Pukhaeva, N., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Read, A. L., Rebecchi, P., Redaelli, N. G., Regler, M., Rehn, J., Reid, D., Reinhardt, R., Renton, P. B., Resvanis, L. K., Richard, F., Ridky, J., Rinaudo, G., Ripp-Baudot, I., Romero, A., Ronchese, P., Rosenberg, E. I., Rosinsky, P., Roudeau, P., Rovelli, T., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovskii, A., Sajot, G., Salmi, L., Salt, J., Sampsonidis, D., Sannino, M., Savoy-Navarro, A., Schwanda, C., Schwemling, P., Schwering, B., Schwickerath, U., Scuri, F., Sedykh, Yu, Segar, A. M., Sekulin, R. L., Sette, G., Shellard, R. C., Siebel, M., Simard, L., Simonetto, F., Sissakian, A. N., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sokolov, A., Solovyanov, O., Sopczak, A., Sosnowski, R., Spassoff, Tz, Spiriti, E., Squarcia, S., Stanescu, C., Stanitzki, M., Stevenson, K., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli Fatis, T., Taffard, A., Tegenfeldt, F., Terranova, F., Timmermans, J., Tinti, N., Tkatchev, L. G., Tobin, M., Todorova, S., Tome, B., Tonazzo, A., Tortora, L., Tortosa, Pablo, Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Turluer, M. L., Tyapkin, I. A., Tyapkin, P., Tzamarias, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Velde, C., Dam, P., Den Boeck, W., Doninck, W. K., Eldik, J., Lysebetten, A., Remortel, N., Vulpen, I., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verdier, P., Verlato, M., Vertogradov, L. S., Verzi, V., Vilanova, D., Vitale, L., Vlasov, E., Vodopyanov, A., Voulgaris, G., Vrba, V., Wahlen, H., Washbrook, A. J., Weiser, C., Wicke, D., Wickens, J. H., Wilkinson, G. R., Winter, M., Witek, M., Wolf, G., Yi, J., Yushchenko, O., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zintchenko, A., Zoller, P., Zumerle, G., Zupan, M., Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), DELPHI, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Abreu, P, Adam, W, Adye, T, Adzic, P, Albrecht, Z, Alderweireld, T, Alekseev, G, Alemany, R, Allmendinger, T, Allport, P, Almehed, S, Amaldi, U, Amapane, N, Amato, S, Anashkin, E, Anassontzis, E, Andersson, P, Andreazza, A, Andringa, S, Anjos, N, Antilogus, P, Apel, W, Arnoud, Y, Asman, B, Augustin, J, Augustinus, A, Baillon, P, Ballestrero, A, Bambade, P, Barao, F, Barbiellini, G, Barbier, R, Bardin, D, Barker, G, Baroncelli, A, Battaglia, M, Baubillier, M, Becks, K, Begalli, M, Behrmann, A, Bellunato, T, Belokopytov, Y, Belous, K, Benekos, N, Benvenuti, A, Berat, C, Berggren, M, Berntzon, L, Bertrand, D, Besancon, M, Besson, N, Bilenky, M, Bloch, D, Blom, H, Bol, J, Bonesini, M, Boonekamp, M, Booth, P, Borisov, G, Bosio, C, Botner, O, Boudinov, E, Bouquet, B, Bowcock, T, Boyko, I, Bozovic, I, Bozzo, M, Bracko, M, Branchini, P, Brenner, R, Brodet, E, Bruckman, P, Brunet, J, Bugge, L, Buschmann, P, Caccia, M, Calvi, M, Camporesi, T, Canale, V, Carena, F, Carroll, L, Caso, C, Cattai, A, Cavallo, F, Chapkin, M, Charpentier, P, Checehia, P, Chelkov, G, Chierici, R, Chliapnikov, P, Chochula, P, Chorowicz, V, Chudoba, J, Chung, S, Cieslik, K, Collins, P, Contri, R, Cosme, G, Cossutti, F, Costa, M, Crawley, H, Crennell, D, Croix, J, Maestro, J, Czellar, S, D'Hondt, J, Dalmau, J, Davenport, M, Da Silva, W, Della Ricca, G, Delpierre, P, Demaria, N, De Angelis, A, De Boer, W, De Clercq, C, De Lotto, B, De Min, A, De Paula, L, Dijkstra, H, Di Ciaccio, L, Doroba, K, Dracos, M, Drees, J, Dris, M, Eigen, G, Ekelof, T, Ellert, M, Elsing, M, Engel, J, Santo, M, Fanourakis, G, Fassouliotis, D, Feindt, T, Fernandez, J, Ferrer, A, Ferrer Ribas, E, Ferro, F, Firestone, A, Flagmeyer, U, Foeth, H, Fokitis, E, Fontanelli, F, Franek, B, Frodesen, A, Fruhwirth, R, Fulda Quenzer, F, Fuster, J, Gamba, D, Gamblin, S, Gandelman, M, Garcia, C, Gaspar, C, Gaspar, M, Gasparini, U, Gavillet, P, Gazis, E, Gele, D, Geralis, T, Ghodbane, N, Glege, F, Gokieli, R, Golob, B, Gomez Ceballos, G, Goncalves, P, Caballero, I, Gopal, G, Gorn, L, Gouz, Y, Gracco, V, Grahl, J, Graziani, E, Grosdidier, G, Grzelak, K, Guy, J, Haag, C, Hahn, F, Hahn, S, Haider, S, Hajduk, Z, Hallgren, A, Hamacher, K, Hamilton, K, Hansen, J, Harris, F, Haug, S, Hauler, F, Hedberg, V, Heising, S, Herquet, P, Herr, H, Hertz, O, Higon, E, Holmgren, S, Holt, P, Hoorelbeke, S, Houlden, M, Hrubec, J, Hughes, G, Hultqvist, K, Jackson, J, Jacobsson, R, Jarlskog, C, Jarlskog, G, Jarry, P, Jean Marie, B, Jeans, D, Johansson, E, Jonsson, P, Joram, C, Juillot, P, Jungermann, L, Kapusta, F, Karafasoulis, K, Katsanevas, S, Katsoufis, E, Keranen, R, Kernel, G, Kersevan, B, Khomenko, B, Khovanski, N, Kiiskinen, A, King, B, Kinvig, A, Kjaer, N, Klapp, O, Kluit, P, Kokkinias, P, Kostioukhine, V, Kourkoumelis, C, Kouznetsov, O, Krammer, M, Kriznic, E, Krumstein, Z, Kubinec, P, Kucewicz, W, Kucharczyk, M, Kurowska, J, Lamsa, J, Laugier, J, Leder, G, Ledroit, F, Leinonen, L, Leisos, A, Leitner, R, Lemonne, J, Lenzen, G, Lepeltier, V, Lethuillier, M, Libby, J, Liebig, W, Liko, D, Lipniacka, A, Lippi, I, Loken, J, Lopes, J, Lopez, J, Lopez Fernandez, R, Loukas, D, Lutz, P, Lyons, L, Macnaughton, J, Mahon, J, Maio, A, Malek, A, Maltezos, S, Malychev, V, Mandl, F, Marco, J, Marco, R, Marechal, B, Margoni, M, Marin, J, Mariotti, C, Markou, A, Martinez Rivero, C, Garcia, S, Masik, J, Mastroyiannopoulos, N, Matorras, F, Matteuzzi, C, Matthiae, G, Mazzucato, F, Mazzucato, M, Mc Cubbin, M, Mc Kay, R, Mc Nulty, R, Merle, E, Meroni, C, Meyer, W, Miagkov, A, Migliore, E, Mirabito, L, Mitaroff, W, Mjoernmark, U, Moa, T, Moch, M, Moenig, K, Monge, M, Montenegro, J, Moraes, D, Morettini, P, Morton, G, Mueller, U, Muenich, K, Mulders, M, Mundim, L, Murray, W, Myatt, G, Myklebust, T, Nassiakou, M, Navarria, F, Nawrocki, K, Negri, P, Nemecek, S, Neufeld, N, Nicolaidou, R, Niezurawski, P, Nikolenko, T, Nomokonov, V, Nygren, A, Oblakowska Mucha, A, Obraztsov, V, Olshevski, A, Onofre, A, Orava, R, Osterberg, K, Ouraou, A, Oyanguren, A, Paganoni, M, Paiano, S, Pain, R, Paiva, R, Palacios, J, Palka, H, Papadopoulou, T, Pape, L, Parkes, C, Parodi, F, Parzefall, U, Passeri, A, Passon, O, Peralta, L, Perepelitsa, V, Pernicka, M, Perrotta, A, Petridou, C, Petrolini, A, Phillips, H, Pierre, F, Pimenta, M, Piotto, E, Podobnik, T, Poireau, V, Pol, M, Polok, G, Poropat, P, Pozdniakov, V, Privitera, P, Pukhaeva, N, Pullia, A, Radojicic, D, Ragazzi, S, Rahmani, H, Ratoff, P, Read, A, Rebecchi, P, Redaelli, N, Regler, M, Rehn, J, Reid, D, Reinhardt, R, Renton, P, Resvanis, L, Richard, F, Ridky, J, Rinaudo, G, Ripp Baudot, I, Romero, A, Ronchese, P, Rosenberg, E, Rosinsky, P, Roudeau, P, Rovelli, T, Ruhlmann Kleider, V, Ruiz, A, Saarikko, H, Sacquin, Y, Sadovsky, A, Sajot, G, Salmi, L, Salt, J, Sampsonidis, D, Sannino, M, Savoy Navarro, A, Schwanda, C, Schwemling, P, Schwering, B, Schwickerath, U, Scuri, F, Seager, P, Sedykh, Y, Segar, A, Sekulin, R, Sette, G, Shellard, R, Siebel, M, Simard, L, Simonetto, F, Sisakian, A, Smadja, G, Smirnov, N, Smirnova, O, Smith, G, Sokolov, A, Solovianov, O, Sopczak, A, Sosnowski, R, Spassov, T, Spiriti, E, Squarcia, S, Stanescu, C, Stanitzki, M, Stocchi, A, Strauss, J, Strub, R, Stugu, D, Szczekowski, M, Szeptycka, M, Szumlak, T, TABARELLI DE FATIS, T, Taffard, A, Tegenfeldt, F, Terranova, F, Timmermans, J, Tinti, N, Tkatchev, L, Tobin, M, Todorova, S, Tome, B, Tortora, L, Tortosa, P, Treille, D, Tristram, G, Trochimczuk, M, Troncon, C, Turluer, M, Tyapkin, I, Tyapkin, P, Tzamarias, S, Ullaland, O, Uvarov, V, Valenti, G, Vallazza, E, Velde, C, Van Dam, P, Van den Boeck, W, Van Doninck, W, Van Eldik, J, Van Lysebetten, A, van Remortel, N, Van Vulpen, I, Vegni, G, Ventura, L, Venus, W, Verbeure, F, Verdier, P, Verlato, M, Vertogradov, L, Verzi, V, Vilanova, D, Vitale, L, Vlasov, E, Vodopyanov, A, Voulgaris, G, Vrba, V, Wahlen, H, Washbrook, A, Weiser, C, Wicke, D, Wickens, J, Wilkinson, G, Winter, M, Wolf, G, Yi, J, Yushchenko, O, Zalewska, A, Zalewski, P, Zavrtanik, D, Zevgolatakos, E, Zimin, N, Zintchenko, A, Zoller, P, Zumerle, G, Zupan, M, Delphi (IHEF, IoP, FNWI), Delphi, Collaboration, Abreu, P., Adam, W., Canale, Vincenzo, and DELPHI Collaboration
- Subjects
Particle physics ,Physics and Astronomy (miscellaneous) ,Meson ,PAIR PRODUCTION ,ENERGIES ,FOS: Physical sciences ,Branching (polymer chemistry) ,01 natural sciences ,CROSS-SECTIONS ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,BHABHA SCATTERING ,MONTE-CARLO ,RADIATIVE-CORRECTIONS ,PARTICLE PHYSICS ,DELPHI DETECTOR ,CP-INVARIANCE ,DECAY ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,010306 general physics ,Engineering (miscellaneous) ,DELPHI ,Physics ,high energy collider ,010308 nuclear & particles physics ,LEP ,Charged particle ,FIS/01 - FISICA SPERIMENTALE ,High Energy Physics::Experiment ,Física nuclear ,Particle Physics - Experiment - Abstract
Using data collected in the DELPHI detector at LEP-1, measurements of the inclusive tau branching ratios for decay modes containing one, three, or five charged particles have been performed, giving the following results: B_1 = B(\tau^- -> (particle)^- \geq 0pi^0 \geq 0K^0 \nu_\tau(\bar{\nu})) = (85.316 +/- 0.093 +/- 0.049)%; B_3 = B(\tau^- -> 2h^-h^+ \geq 0pi^0 \geq 0K^0 \nu_\tau) = (14.569 +/- 0.093 +/- 0.048)%; B_5 = B(\tau^- -> 3h^-2h^+ \geq 0pi^0 \geq 0K^0 \nu_\tau) = (0.115 +/- 0.013 +/- 0.006)%, where h is either a charged pi or K meson. The first quoted uncertainties are statistical and the second systematic., Comment: 32 pages, 10 figures, Accepted by Eur. Phys. J. C
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- 2016
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47. A STUDY OF THE DECAYS OF TAU LEPTONS PRODUCED ON THE Z-RESONANCE AT LEP
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Abreu, P, Adam, W, Adami, F, Adye, T, Agasi, E, Alekseev, G D, Allen, P, Almehed, S, Alvsvaag, S J, Amaldi, Ugo, Anassontzis, E G, Andreazza, A, Antilogus, P, Apel, W D, Apsimon, R J, Åsman, B, Augustin, J E, Augustinus, A, Baillon, Paul, Bambade, P, Barão, F, Barate, R, Barbiellini, Guido, Bardin, Dimitri Yuri, Baroncelli, A, Bärring, O, Barrio, J A, Bartl, Walter, Bates, M J, Battaglia, Marco, Baubillier, M, Becks, K H, Beeston, C J, Begalli, M, Beillière, P, Belokopytov, Yu A, Beltran, P, Benedic, D, Berggren, M, Bertrand, D, Bianchi, F, Bilenky, S M, Billoir, P, Bjarne, J, Bloch, D, Blyth, S, Bocci, V, Bogolubov, P N, Bolognese, T, Bonesini, M, Bonivento, W, Booth, P S L, Borgeaud, P, Borisov, G, Börner, H, Bosio, C, Bostjancic, B, Botner, O, Bouquet, B, Bourdarios, C, Bowcock, T J V, Bozzo, M, Braibant, S, Branchini, P, Brand, K D, Brenner, R A, Briand, H, Bricman, C, Brown, R C A, Brümmer, N, Brunet, J M, Bugge, L, Buran, T, Burmeister, H, Buytaert, J, Caccia, M, Calvi, M, 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Straver, J, Strub, R, Szczekowski, M, Szeptycka, M, Szymanski, P, Tabarelli de Fatis, T, Tavernier, Stefaan, Chikilev, O G, Theodosiou, G E, Tilquin, A, Timmermans, J, Timofeev, V G, Tkatchev, L G, Todorov, T, Toet, D Z, Toker, O, Torassa, E, Tortora, L, Trainor, M T, Treille, D, Trevisan, U, Trischuk, W, Tristram, G, Troncon, C, Tsirou, A L, Tsyganov, E N, Turala, Michal, Turchetta, R, Turluer, M L, Tuuva, T, Tyapkin, I A, Tyndel, M, Tzamarias, S, Überschär, S, Ullaland, O, Uvarov, V, Valenti, G, Vallazza, E, Valls Ferrer, J A, Van der Velde, C, van Apeldoorn, G W, van Dam, P, Van Doninck, W K, Varela, J, Vaz, P, Vegni, G, Ventura, L, Venus, W A, Verbeure, F, Vertogradov, L S, Vilanova, D, Vitale, L, Vlasov, E V, Vlassopoulos, S, Vodopyanov, A S, Vollmer, M, Volponi, S, Voulgaris, G, Voutilainen, M, Vrba, V, Wahlen, H, Walck, C, Waldner, F, Wayne, M, Wehr, A, Weierstall, M, Weilhammer, Peter, Werner, J, Wetherell, Alan M, Wickens, J H, Wikne, J, Wilkinson, G R, Williams, W S C, Winter, M, Wormald, D, Wormser, G, Woschnagg, K, Yamdagni, N, Yepes, P, Zaitsev, A, Zalewska-Bak, A, Zalewski, Piotr, Zavrtanik, D, Zevgolatakos, E, Zhang, G, Zimin, N I, Zito, M, Zitoun, R, Zukanovich-Funchal, R, Zumerle, G, Zúñiga, J, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), DELPHI, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), UCL - SST/IRMP - Institut de recherche en mathématique et physique, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Particle physics ,E+E ANNIHILATION ,POLARIZATION ,Physics and Astronomy (miscellaneous) ,Electron–positron annihilation ,MONTE-CARLO SIMULATION ,RADIATIVE-CORRECTIONS ,PHOTON CORRECTIONS ,BHABHA SCATTERING ,JET FRAGMENTATION ,PERTURBATIVE QCD ,HIGH-ENERGIES ,PHYSICS ,Elementary particle ,01 natural sciences ,7. Clean energy ,Nuclear physics ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Quantum field theory ,Born approximation ,010306 general physics ,Engineering (miscellaneous) ,Physics ,Coupling constant ,010308 nuclear & particles physics ,Electroweak interaction ,Weinberg angle ,Physique des particules élémentaires ,Particle Physics - Experiment ,Lepton - Abstract
From the analysis of a data sample corresponding to an integrated luminosity of 4.63 pb-1 taken during the 1990 run of LEP at centre of mass energies between 88.2 GeV an 94.2 GeV, the tau decays {Mathematical expression} and their charge conjugates have been studied. The following branching ratios have been measured; {Mathematical expression}, {Mathematical expression}, Br(τ- → π- (K-)vτ)=11.9±0.7±0.7%, BR (τ- → ρ- vτ)= 22.4±0.8±1.3%, in good agreement with world averages. The measured electronic and muonic branching ratios lead to a measurement of the strong coupling constant, αs (mτ) = 0.26-0.12 +0.09. Extrapolating the αs value from mτ to mZ yields αs (mZ) = 0.109-0.028 +0.012. The average polarization Pτ of taus produced in Z → τs τs decays has also been measured using the above decay modes. The weighted mean of the polarizations obtained from the four decay modes is Pτ=-0.24±0.07. This value of Pτ gives, in the improved Born approximation, a ratio between the axial and vector coupling constants of the tau of υτ/aτ = 0.12 ± 0.04, and hence a value of the effective electroweak mixing parameter sin2 θW(mZ 2). © 1992 Springer-Verlag., 0, SCOPUS: ar.j, info:eu-repo/semantics/published
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- 2016
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48. ELECTROWEAK COUPLING-CONSTANTS IN THE LEPTONIC REACTIONS E+E--]E+E- AND E+E--]MU+MU- AND SEARCH FOR SCALAR LEPTONS
- Author
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O. Römer, T. Barklow, H. Kowalski, W. Koch, W. G. Jones, K. Gather, C. Youngman, I. C. Brock, G. Poelz, G. Mikenberg, K. H. Mess, E. Lohrmann, D. M. Binnie, I. Al-Agil, Hu Martyn, Quarrie, U. Karshon, B. Foster, M. Holder, H. Hultschig, Y. Eisenberg, Gy. Wolf, M. G. Bowler, Gl Salmon, J. Sedgbeer, B. H. Wiik, R.C.E. Devenish, T. Meyer, W. Braunschweig, H. Hartmann, R. Wedemeyer, P. J. Dornan, P. Grossmann, H. Boerner, D. Lüke, Ehud Duchovni, A. Ladage, J. Franzke, Norbert Wermes, S. L. Wu, A. Shapira, J. Proudfoot, John Illingworth, U. Kötz, D. Heyland, D.W. Schmitz, T. R. Wyatt, P. L. Woodworth, Juergen Thomas, D. A. Garbutt, H. Burkhardt, A. J. Campbell, E.E. Ronat, W. Schütte, E. Hilger, D. Notz, R. Fohrmann, K. Lübelsmeyer, P. Söding, G. Knop, S. Cooper, M. Wollstadt, R. Carnegie, P. E. L. Clarke, P. Leu, R. Brandelik, D. Pandoulas, D. Revel, J. Rimkus, F. J. Kirschfink, L. Köpke, H. G. Sander, H. L. Lynch, Walter Dr. Hillen, G. Peise, Hl Krasemann, G. Rudolph, B. Löhr, R. Riethmüller, J. Pyrlik, Kw Bell, P. Schmüser, T. D. Jones, J. Harvey, Rj Cashmore, H. M. Fischer, D. H. Saxon, Georg Zobernig, R. Beuselinck, J. C. Hart, Sl Lloyd, P. Mättig, M. Ogg, P. Joos, E. Wicklund, D. Trines, W. Wallraff, and Hermann Kolanoski
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Physics ,Coupling constant ,Nuclear and High Energy Physics ,Particle physics ,Muon ,Scalar (mathematics) ,Electroweak interaction ,Weinberg angle ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Nuclear physics ,Pair production ,High Energy Physics::Experiment ,Lepton ,Bhabha scattering - Abstract
A high statistics experiment was performed on Bhabha scattering at energies between 14 and 34 GeV. Good agreement with QED was observed. The combined data on Bhabha scattering and μ pair production were found to agree with the standard theory of electroweak interaction giving sin2 θ = 0.27-0.07+0.06. Assuming for the Z0 mass a value of 90 GeV the leptonic weak coupling constants were determined to gV2 = -0.04 ± 0.06 and gA2 = 0.35 ± 0.09. A search for scalar leptons sets lower limits on the mass of scalar electrons ofMse > 16.6 GeV and of scalar muons of Msμ > 16.4 GeV. © 1982.
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- 2016
49. QED Radiative Corrections to Low-Energy Moller and Bhabha Scattering
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Richard G. Milner and C.S. Epstein
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Physics ,Particle physics ,Range (particle radiation) ,010308 nuclear & particles physics ,Bremsstrahlung ,FOS: Physical sciences ,Photon energy ,01 natural sciences ,Low energy ,Photon emission ,0103 physical sciences ,Radiative transfer ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Bhabha scattering - Abstract
We present a treatment of the next-to-leading-order radiative corrections to unpolarized M\o{}ller and Bhabha scattering without resorting to ultrarelativistic approximations. We extend existing soft-photon radiative corrections with new hard-photon bremsstrahlung calculations so that the effect of photon emission is taken into account for any photon energy. This formulation is intended for application in the OLYMPUS experiment and the upcoming DarkLight experiment but is applicable to a broad range of experiments at energies where QED is a sufficient description.
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- 2016
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- View/download PDF
50. Two-loop Bhabha scattering at high energy beyond leading power approximation
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Penin, A. A. and Zerf, N.
- Subjects
QED ,Bhabha scattering ,Physics ,ddc:530 ,Perturbation theory - 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.
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- 2016
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