Combined QCD and electroweak analysis of HERA data
ZEUS Collaboration, H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, S. Antonelli, V. Aushev, O. Behnke, U. Behrens, A. Bertolin, S. Bhadra, I. Bloch, E. G. Boos,… 展开作者
ZEUS Collaboration, H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, S. Antonelli, V. Aushev, O. Behnke, U. Behrens, A. Bertolin, S. Bhadra, I. Bloch, E. G. Boos, I. Brock, N. H. Brook, R. Brugnera, A. Bruni, P. J. Bussey, A. Caldwell, M. Capua, C. D. Catterall, J. Chwastowski, J. Ciborowski, R. Ciesielski, A. M. Cooper-Sarkar, M. Corradi, R. K. Dementiev, R. C. E. Devenish, S. Dusini, B. Foster, G. Gach, E. Gallo, A. Garfagnini, A. Geiser, A. Gizhko, L. K. Gladilin, Yu. A. Golubkov, G. Grzelak, M. Guzik, C. Gwenlan, W. Hain, O. Hlushchenko, D. Hochman, R. Hori, Z. A. Ibrahim, Y. Iga, M. Ishitsuka, F. Januschek, N. Z. Jomhari, I. Kadenko, S. Kananov, U. Karshon, P. Kaur, D. Kisielewska, R. Klanner, U. Klein, I. A. Korzhavina, A. Kotanski, U. Koetz, N. Kovalchuk, H. Kowalski, B. Krupa, O. Kuprash, M. Kuze, B. B. Levchenko, A. Levy, S. Limentani, M. Lisovyi, E. Lobodzinska, B. Loehr, E. Lohrmann, A. Longhin, D. Lontkovskyi, O. Yu. Lukina, I. Makarenko, J. Malka, A. Mastroberardino, F. Mohamad Idris, N. Mohammad Nasir, V. Myronenko, K. Nagano, T. Nobe, R. J. Nowak, Yu. Onishchuk, E. Paul, W. Perlanski, N. S. Pokrovskiy, A. Polini, M. Przybycien, P. Roloff, M. Ruspa, D. H. Saxon, M. Schioppa, U. Schneekloth, T. Schoerner-Sadenius, L. M. Shcheglova, R. Shevchenko, O. Shkola, Yu. Shyrma, I. Singh, I. O. Skillicorn, W. Slominski, A. Solano, L. Stanco, N. Stefaniuk, A. Stern, P. Stopa, J. Sztuk-Dambietz, E. Tassi, K. Tokushuku, J. Tomaszewska, T. Tsurugai, M. Turcato, O. Turkot, T. Tymieniecka, A. Verbytskyi, W. A. T. Wan Abdullah, K. Wichmann, M. Wing, S. Yamada, Y. Yamazaki, N. Zakharchuk, A. F. Zarnecki, L. Zawiejski, O. Zenaiev, B. O. Zhautykov, D. S. Zotkin
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32 pages, 10 figures, accepted by Phys. Rev. D. Small corrections from proofing process and small change to Fig. 12 and Table 4
A simultaneous fit of parton distribution functions (PDFs) and electroweak parameters to HERA data on deep inelastic scattering is presented. The input data are the neutral current and charged current inclusive cross sections which were previously used in the QCD analysis leading to the HERAPDF2.0 PDFs. In addition, the polarisation of the electron beam was taken into account for the ZEUS data recorded between 2004 and 2007. Results on the vector and axial-vector couplings of the Z boson to u- and d-type quarks, on the value of the electroweak mixing angle and the mass of the W boson are presented. The values obtained for the electroweak parameters are in agreement with Standard Model predictions.
Recent Electroweak Measurements from the H1 and ZEUS Experiments
Neutral-current ({NC}) and charged-current ({CC}) deep inelastic scattering ({DIS}) reactions have been studied in $e^+p$ and $e^-p$ collisions using the {H1} and {ZEUS} detectors at {HERA I}. Following the upgrade of the {HERA} accelerator, the {HERA II} program recently started with the first data in $e^+p$ scattering with longitudinally polarised positrons. In this paper, a summary of the electroweak results from {HERA I} and the first measurement of the cross section for $e^+p$ CC {DIS} at a longitudinal polarisation value of 33% from the {ZEUS} collaboration are presented.
QCD analysis of leading-neutron production at HERA: Determination of neutron fracture functions
在过去的二十年里，电子质子对撞机HERA的实验工作呈现出越来越大的趋势，HERA收集了关于携带大部分质子能量的领先中子（LN）和领先质子（LP）的光谱的高精度数据。在我们最近的研究[Phys. Rev. D \textbf{95}（2017），074011]中，我们提出了一种基于断裂函数（FF）形式主义的方法，并从HERA的H1和ZEUS合作测量的LN生产数据的全球QCD分析中提取了中子断裂函数（中子FF）。我们已经表明，考虑到基于断裂函数框架的方法，人们可以在输入尺度上唯象地参数化中子FF。为了评估所获得的中子FFS以及LN结构函数和截面的不确定性，与数据中的不确定性相关联，我们已经广泛使用了“Hessian方法”。我们的理论预测的基础上获得的中子FFS是在令人满意的协议与所有LN数据分析，广泛的$β$和$x_L$。
在HERA的深度非弹性ep散射中，在Bjorken标度变量x> 0.001，0.1 <y156度的运动学区域内寻找QCD瞬子诱导过程的信号<0.6 and polar angle of the scattered positron >。上限来自预期的瞬子诱导的最终状态的性质的基础上QCDINS蒙特卡罗模型。
