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Measurement of the cross section for hard exclusive π0 muoproduction on the proton
Physics Letters B ( IF 4.3 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.physletb.2020.135454
M.G. Alexeev , G.D. Alexeev , A. Amoroso , V. Andrieux , N.V. Anfimov , V. Anosov , A. Antoshkin , K. Augsten , W. Augustyniak , C.D.R. Azevedo , B. Badełek , F. Balestra , M. Ball , J. Barth , R. Beck , Y. Bedfer , J. Bernhard , M. Bodlak , P. Bordalo , F. Bradamante , A. Bressan , M. Büchele , V.E. Burtsev , W.-C. Chang , C. Chatterjee , M. Chiosso , A.G. Chumakov , S.-U. Chung , A. Cicuttin , M.L. Crespo , S. Dalla Torre , S.S. Dasgupta , S. Dasgupta , O.Yu. Denisov , L. Dhara , S.V. Donskov , N. Doshita , Ch. Dreisbach , W. Dünnweber , R.R. Dusaev , A. Efremov , P.D. Eversheim , M. Faessler , A. Ferrero , M. Finger , M. Finger , H. Fischer , C. Franco , N. du Fresne von Hohenesche , J.M. Friedrich , V. Frolov , E. Fuchey , F. Gautheron , O.P. Gavrichtchouk , S. Gerassimov , J. Giarra , I. Gnesi , M. Gorzellik , A. Grasso , A. Gridin , M. Grosse Perdekamp , B. Grube , A. Guskov , D. Hahne , G. Hamar , D. von Harrach , R. Heitz , F. Herrmann , N. Horikawa , N. d'Hose , C.-Y. Hsieh , S. Huber , S. Ishimoto , A. Ivanov , T. Iwata , M. Jandek , V. Jary , R. Joosten , P. Jörg , K. Juraskova , E. Kabuß , F. Kaspar , A. Kerbizi , B. Ketzer , G.V. Khaustov , Yu.A. Khokhlov , Yu. Kisselev , F. Klein , J.H. Koivuniemi , V.N. Kolosov , K. Kondo Horikawa , I. Konorov , V.F. Konstantinov , A.M. Kotzinian , O.M. Kouznetsov , Z. Kral , M. Krämer , F. Krinner , Z.V. Kroumchtein , Y. Kulinich , F. Kunne , K. Kurek , R.P. Kurjata , A. Kveton , S. Levorato , Y.-S. Lian , J. Lichtenstadt , P.-J. Lin , R. Longo , V.E. Lyubovitskij , A. Maggiora , A. Magnon , N. Makins , N. Makke , G.K. Mallot , S.A. Mamon , B. Marianski , A. Martin , J. Marzec , J. Matoušek , T. Matsuda , G.V. Meshcheryakov , M. Meyer , W. Meyer , Yu.V. Mikhailov , M. Mikhasenko , E. Mitrofanov , N. Mitrofanov , Y. Miyachi , A. Moretti , C. Naim , A. Nagaytsev , D. Neyret , J. Nový , W.-D. Nowak , G. Nukazuka , A.S. Nunes , A.G. Olshevsky , M. Ostrick , D. Panzieri , B. Parsamyan , S. Paul , J.-C. Peng , F. Pereira , M. Pešek , D.V. Peshekhonov , M. Pešková , N. Pierre , S. Platchkov , J. Pochodzalla , V.A. Polyakov , J. Pretz , M. Quaresma , C. Quintans , S. Ramos , C. Regali , G. Reicherz , C. Riedl , D.I. Ryabchikov , A. Rybnikov , A. Rychter , V.D. Samoylenko , A. Sandacz , S. Sarkar , I.A. Savin , G. Sbrizzai , H. Schmieden , A. Selyunin , L. Silva , L. Sinha , M. Slunecka , J. Smolik , A. Srnka , D. Steffen , M. Stolarski , O. Subrt , M. Sulc , H. Suzuki , A. Szabelski , T. Szameitat , P. Sznajder , S. Tessaro , F. Tessarotto , A. Thiel , J. Tomsa , F. Tosello , V. Tskhay , S. Uhl , B.I. Vasilishin , A. Vauth , B.M. Veit , J. Veloso , A. Vidon , M. Virius , M. Wagner , S. Wallner , M. Wilfert , K. Zaremba , P. Zavada , M. Zavertyaev , E. Zemlyanichkina , Y. Zhao , M. Ziembicki

We report on a measurement of hard exclusive $\pi^0$ muoproduction on the proton by COMPASS using 160 GeV/$c$ polarised $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured $\mu^+$ and $\mu^-$ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range $0.08\,(\text{GeV/}c)^2 < |t| < 0.64\,(\text{GeV/}c)^2$. The average kinematics of the measurement are $\langle Q^2 \rangle =2.0\; {(\text{GeV}/c)^2}$, $\langle \nu \rangle = 12.8\; {\text{GeV}}$, $\langle x_{Bj} \rangle = 0.093 $ and $\langle -t \rangle = 0.256\; {(\text{GeV}/c)^2} $. Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of $(8.1 \ \pm \ 0.9_{\text{stat}}{}_{- \ 1.0}^{+ \ 1.1}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$, as well as transverse-transverse and longitudinal-transverse interference contributions of $(-6.0 \pm 1.3_{\text{stat}}{}_{- \ 0.7}^{+ \ 0.7}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ and $(1.4 \pm 0.5_{\text{stat}}{}_{- \ 0.2}^{+ \ 0.3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$, respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD $\overline{E}_T$.

中文翻译:

在质子上测量硬排他性 π0 muo 的横截面

我们报告了 COMPASS 使用 160 GeV/$c$ 极化的 $\mu^+$ 和撞击液体的 CERN SPS 的 $\mu^-$ 光束对质子的硬排他性 $\pi^0$ muo 产生的测量氢靶。从测量的 $\mu^+$ 和 $\mu^-$ 横截面的平均值,虚拟光子质子横截面被确定为初始和最终质子之间在 $0.08 范围内的平方四动量转移的函数\,(\text{GeV/}c)^2 < |t| < 0.64\,(\text{GeV/}c)^2$。测量的平均运动学为$\lange Q^2 \rangle =2.0\;{(\text{GeV}/c)^2}$, $\langle \nu \rangle = 12.8\; {\text{GeV}}$, $\langle x_{Bj} \rangle = 0.093 $ 和 $\langle -t \rangle = 0.256\; {(\text{GeV}/c)^2} $。拟合方位角依赖性揭示了 $(8.1 \ \pm \ 0. 9_{\text{stat}}{}_{- \ 1.0}^{+ \ 1.1}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV }/c)^{2}}$,以及 $(-6.0 \pm 1.3_{\text{stat}}{}_{- \ 0.7}^{+ \ 0.7}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 和 $(1.4 \pm 0.5_{ \text{stat}}{}_{- \ 0.2}^{+ \ 0.3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/ c)^{2}}$,分别。我们的结果为建模广义 Parton 分布提供了重要的输入。在现象学 Goloskokov-Kroll 模型的背景下,统计上显着的横向-横向干扰贡献构成了手征奇数 GPD $\overline{E}_T$ 的明确实验证据。以及 $(-6.0 \pm 1.3_{\text{stat}}{}_{- \ 0.7}^{+ \ 0.7}\big\rvert_{\text{ sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 和 $(1.4 \pm 0.5_{\text{stat}}{}_{- \ 0.2}^{+ \ 0.3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 分别。我们的结果为建模广义 Parton 分布提供了重要的输入。在现象学 Goloskokov-Kroll 模型的背景下,统计上显着的横向-横向干扰贡献构成了手征奇数 GPD $\overline{E}_T$ 的明确实验证据。以及 $(-6.0 \pm 1.3_{\text{stat}}{}_{- \ 0.7}^{+ \ 0.7}\big\rvert_{\text{ sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 和 $(1.4 \pm 0.5_{\text{stat}}{}_{- \ 0.2}^{+ \ 0.3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 分别。我们的结果为建模广义 Parton 分布提供了重要的输入。在现象学 Goloskokov-Kroll 模型的背景下,统计上显着的横向-横向干扰贡献构成了手征奇数 GPD $\overline{E}_T$ 的明确实验证据。3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 分别。我们的结果为建模广义 Parton 分布提供了重要的输入。在现象学 Goloskokov-Kroll 模型的背景下,统计上显着的横向 - 横向干扰贡献构成了手征奇数 GPD $\overline{E}_T$ 的明确实验证据。3}\big\rvert_{\text{sys}})\,{\text{nb}}/{(\text{GeV}/c)^{2}}$ 分别。我们的结果为建模广义 Parton 分布提供了重要的输入。在现象学 Goloskokov-Kroll 模型的背景下,统计上显着的横向-横向干扰贡献构成了手征奇数 GPD $\overline{E}_T$ 的明确实验证据。
更新日期:2020-06-01
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