大型强子对撞机的类符号w -玻色子散射——近似和完整次一级预测

IF 5 1区 物理与天体物理 Q1 PHYSICS, PARTICLES & FIELDS
Stefan Dittmaier, Philipp Maierhöfer, Christopher Schwan, Ramon Winterhalder
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引用次数: 0

摘要

摘要本文提出了在蒙特卡洛积分器B onsay中实现的大型强子对撞机强、电弱相互作用对w -玻色子散射的次一级修正的新计算。计算包括W玻色子的轻子衰变。在强耦合和电弱耦合α s和α中,它由整个次领先级贡献塔组成,其尺度为$$ {\alpha}_{\textrm{s}}^3 $$ α s 3 α 4, $$ {\alpha}_{\textrm{s}}^2 $$ α s 2 α 5, α s α 6和α 7。我们给出了详细的数值结果,证实了−12量级的大纯电弱修正的存在% for integrated cross sections and even larger corrections in high-energy tails of distributions. The electroweak corrections account for the major part of the complete next-to-leading-order correction, which amounts to 15–20% in size, depending on the details of the event selection chosen for analysing vector-boson-scattering. Moreover, we compare the full next-to-leading-order corrections to approximate results based on the neglect of contributions that are not enhanced by the vector-boson scattering kinematics (VBS approximation) and on resonance expansions for the W-boson decays (double-pole approximation) ; the quality of this approximation is good within ≲ 1 . 5% for integrated cross sections and the dominating parts of the differential distributions. Finally, for the leading-order predictions, we construct different versions of effective vector-boson approximations , which are based on cross-section contributions that are enhanced by collinear emission of W bosons off the initial-state (anti)quarks; in line with previous findings in the literature, it turns out that the approximative quality is rather limited for applications at the LHC.
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Like-sign W-boson scattering at the LHC — approximations and full next-to-leading-order predictions
A bstract We present a new calculation of next-to-leading-order corrections of the strong and electroweak interactions to like-sign W-boson scattering at the Large Hadron Collider, implemented in the Monte Carlo integrator B onsay . The calculation includes leptonic decays of the W bosons. It comprises the whole tower of next-to-leading-order contributions to the cross section, which scale like $$ {\alpha}_{\textrm{s}}^3 $$ α s 3 α 4 , $$ {\alpha}_{\textrm{s}}^2 $$ α s 2 α 5 , α s α 6 , and α 7 in the strong and electroweak couplings α s and α . We present a detailed survey of numerical results confirming the occurrence of large pure electroweak corrections of the order of ~ −12% for integrated cross sections and even larger corrections in high-energy tails of distributions. The electroweak corrections account for the major part of the complete next-to-leading-order correction, which amounts to 15–20% in size, depending on the details of the event selection chosen for analysing vector-boson-scattering. Moreover, we compare the full next-to-leading-order corrections to approximate results based on the neglect of contributions that are not enhanced by the vector-boson scattering kinematics (VBS approximation) and on resonance expansions for the W-boson decays (double-pole approximation) ; the quality of this approximation is good within ≲ 1 . 5% for integrated cross sections and the dominating parts of the differential distributions. Finally, for the leading-order predictions, we construct different versions of effective vector-boson approximations , which are based on cross-section contributions that are enhanced by collinear emission of W bosons off the initial-state (anti)quarks; in line with previous findings in the literature, it turns out that the approximative quality is rather limited for applications at the LHC.
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来源期刊
Journal of High Energy Physics
Journal of High Energy Physics PHYSICS, PARTICLES & FIELDS-
CiteScore
10.00
自引率
46.30%
发文量
2107
审稿时长
12 weeks
期刊介绍: The aim of the Journal of High Energy Physics (JHEP) is to ensure fast and efficient online publication tools to the scientific community, while keeping that community in charge of every aspect of the peer-review and publication process in order to ensure the highest quality standards in the journal. Consequently, the Advisory and Editorial Boards, composed of distinguished, active scientists in the field, jointly establish with the Scientific Director the journal''s scientific policy and ensure the scientific quality of accepted articles. JHEP presently encompasses the following areas of theoretical and experimental physics: Collider Physics Underground and Large Array Physics Quantum Field Theory Gauge Field Theories Symmetries String and Brane Theory General Relativity and Gravitation Supersymmetry Mathematical Methods of Physics Mostly Solvable Models Astroparticles Statistical Field Theories Mostly Weak Interactions Mostly Strong Interactions Quantum Field Theory (phenomenology) Strings and Branes Phenomenological Aspects of Supersymmetry Mostly Strong Interactions (phenomenology).
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