Longitudinal double-spin asymmetry A1p and spin-dependent structure function g1p of the proton at small values of x and Q2 / M. Aghasyan [et al.]

Уровень набора: Physics Letters BАльтернативный автор-лицо: Aghasyan, M., Mher;Amoroso, A.;Burtsev, V. E., mathematician, Senior Lecturer of Tomsk Polytechnic University, 1991-, Vitaly Evgenjevich;Chumakov, A. G., physicist, laboratory assistant-researcher of Tomsk Polytechnic University, 1992-, Aleksandr Grigorjevich;Dusaev, R. R., specialist in the field of nuclear physics, Engineer of Tomsk Polytechnic University, 1988-, Renat Ramilyevich;Levchenko, E. A., mathematician, technician, Senior Lecturer of Tomsk Polytechnic University, candidate of physico-mathematical Sciences, 1988-, Evgeny Anatolievich;Lyubovitskiy (Lyubovitskij), V. E., physicist, Professor of Tomsk Polytechnic University, Doctor of physical and mathematical sciences, Professor of the University of Tubingen (Germany), 1963-, Valery Efimovich;Mamon, S. A., physicist, laboratory assistant-researcher of Tomsk Polytechnic University, 1989-, Sergey Aleksandrovich;Vasilishin, B. I., engineer-physicist, laboratory researcher at Tomsk Polytechnic University, 1990-, Bogdan IvanovichКоллективный автор (вторичный): Национальный исследовательский Томский политехнический университет, Исследовательская школа физики высокоэнергетических процессов, (2017- )Язык: английский.Резюме или реферат: We present a precise measurement of the proton longitudinal double-spin asymmetry A1p and the proton spin-dependent structure function g1p at photonvirtualities 0.006(GeV/c)2<Q2<1(GeV/c)2 in the Bjorken x range of 4×10−5<x<4×10−2. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160GeV and 200GeV. The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x, the measured values of A1p and g1p are found to be positive. It is for the first time that spin effects are found at such low values of x..Примечания о наличии в документе библиографии/указателя: [References.: 25 tit.].Тематика: электронный ресурс | труды учёных ТПУ | Inelastic muon scattering | Spin structure function | мюонные атомы | рассеяние Ресурсы он-лайн:Щелкните здесь для доступа в онлайн | Щелкните здесь для доступа в онлайн
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[References.: 25 tit.]

We present a precise measurement of the proton longitudinal double-spin asymmetry A1p and the proton spin-dependent structure function g1p at photonvirtualities 0.006(GeV/c)2<Q2<1(GeV/c)2 in the Bjorken x range of 4×10−5<x<4×10−2. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160GeV and 200GeV. The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x, the measured values of A1p and g1p are found to be positive. It is for the first time that spin effects are found at such low values of x.

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