Двофотонний обмін у пружному розсіянні електронів на адронних системах

Автор(и)

  • D. Borisyuk Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine
  • A. Kobushkin National Technical University of Ukraine “Igor Sikorsky KPI”

DOI:

https://doi.org/10.15407/ujpe66.1.3

Ключові слова:

two-photon exchange, elastic scattering, proton form factors

Анотація

Дається огляд рiзних аспектiв двофотонного обмiну (ДФО)
у пружному розсiяннi електронiв на протонах, як при низьких, так i при високих Q2. Уявна частина амплiтуди ДФО приводить до появи одночастинкових спiнових асиметрiй. Розглянуто рiзнi пiдходи до розрахунку цих спостережуваних. Дiйсна частина амплiтуди ДФО впливає на перерiз розсiяння неполяризованих частинок i подвiйнi спiновi спостережуванi, та, найбiльш iмовiрно, призводить до розбiжностi двох методiв вимiрювання формфакторiв протона. Обговорюються методи розрахунку амплiтуд ДФО, зокрема “адронний” та “кварк-глюонний” пiдходи, дисперсiйний метод, що може використовуватися при низьких та середнiх Q2, а також зв’язок з проблемою радiуса протона. Розглянуто сучасний стан експериментiв iз прямого спостереження ефектiв ДФО за допомогою вимiрювання зарядової асиметрiї пружного розсiяння, та спроби визначення амплiтуд ДФО, виходячи з експериментальних даних. Також наводиться огляд двофотонних ефектiв у iнших процесах, таких як розсiяння мюонiв на протонах, електронiв на ядрах, на пiонах та iншi.

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2021-01-29

Як цитувати

Borisyuk, D., & Kobushkin, A. (2021). Двофотонний обмін у пружному розсіянні електронів на адронних системах. Український фізичний журнал, 66(1), 3. https://doi.org/10.15407/ujpe66.1.3

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