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arXiv 0802.3017hep-ex
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用ZEUS前塞量热计在25到320 GeV $^2$的$Q^2$值下的深度非弹性包含和衍射散射

Deep inelastic inclusive and diffractive scattering at $Q^2$ values from 25 to 320 GeV$^2$ with the ZEUS forward plug calorimeter

ZEUS Collaboration, S. Chekanov

摘要:

在HERA用ZEUS探测器研究了深度非弹性散射及其衍射分量$ep \to e^{\prime}γ^* p \to e^{\prime}XN$,使用的积分光度为52.4 pb $ep \to e^{\prime}γ^* p \to e^{\prime}XN$。$M_X$方法已被用来提取衍射贡献。覆盖了质心能量$W$(37 - 245 GeV)、光子虚$Q^2$(20 - 450 GeV $^2$)和质量$M_X$(0.28 - 35 GeV)的宽范围。$2 < M_X < 15$ GeV的衍射截面随着$W$的增大而增大,随着$Q^2$的增大,衍射截面的增大幅度更大.的数据也提出了在衍射结构函数,$F^{\rm D(3)}_2$,质子。对于固定的$Q^2$和固定的$M_X$,$\xpom F^{\rm D(3)}_2$显示出与$\xpom \to 0$一样的强烈上升,其中$\xpom$是坡密子携带的质子动量的分数。对于Bjorken- $x < 1 \cdot 10^{-3}$,$\xpom F^{\rm D(3)}_2$显示正的$\log Q^2$比例违反,而对于$x \ge 5 \cdot 10^{-3}$,观察到负的比例违反。衍射结构的功能与超前扭转是相容的。数据表明,Regge因子分解被破坏了。

英文摘要:

Deep inelastic scattering and its diffractive component, $ep \to e^{\prime}γ^* p \to e^{\prime}XN$, have been studied at HERA with the ZEUS detector using an integrated luminosity of 52.4 pb$^{-1}$. The $M_X$ method has been used to extract the diffractive contribution. A wide range in the centre-of-mass energy $W$ (37 -- 245 GeV), photon virtuality $Q^2$ (20 -- 450 GeV$^2$) and mass $M_X$ (0.28 -- 35 GeV) is covered. The diffractive cross section for $2 < M_X < 15$ GeV rises strongly with $W$, the rise becoming steeper as $Q^2$ increases. The data are also presented in terms of the diffractive structure function, $F^{\rm D(3)}_2$, of the proton. For fixed $Q^2$ and fixed $M_X$, $\xpom F^{\rm D(3)}_2$ shows a strong rise as $\xpom \to 0$, where $\xpom$ is the fraction of the proton momentum carried by the Pomeron. For Bjorken-$x < 1 \cdot 10^{-3}$, $\xpom F^{\rm D(3)}_2$ shows positive $\log Q^2$ scaling violations, while for $x \ge 5 \cdot 10^{-3}$ negative scaling violations are observed. The diffractive structure function is compatible with being leading twist. The data show that Regge factorisation is broken.

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