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arXiv 1201.2808hep-ex
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用ATLAS探测器在sqrt(s)= 7 TeV的pp碰撞中测量的快度能隙截面

Rapidity gap cross sections measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

ATLAS Collaboration

摘要:

利用积分亮度为7.1微仓的最小偏差数据样本,研究了sqrt(s)= 7 TeV质子-质子碰撞中赝快度能隙的分布。截面是用Δ eta F差分测量的,在eta = +/- 4.9时,扩展到ATLAS灵敏度极限的伪快度区域中较大的一个,其中在横向动量阈值p_T Cut以上没有产生终态粒子。对于200 < p_T切割< 800 MeV,测量跨越区域0 <Δ eta F < 8。在小Δ eta F,数据测试强子化模型的可靠性,在描述速度和横向动量波动的最终状态粒子生产。在更大的间隙尺寸的测量是由来自单衍射解离过程(pp -> Xp)的贡献占主导地位,由双解离(pp -> XY)增强,其中两个解离系统中较轻的不变质量满足M_Y <~ 7 GeV。得到的截面为d sigma / d Delta eta F ~ 1 mb,其中Delta eta F >~ 3。大快度间隙的数据被用来约束的软衍射的三重Regge模型适当的坡密子截距的值。集成在所有间隙尺寸的截面与其他LHC非弹性截面测量进行了比较。

英文摘要:

Pseudorapidity gap distributions in proton-proton collisions at sqrt(s) = 7 TeV are studied using a minimum bias data sample with an integrated luminosity of 7.1 inverse microbarns. Cross sections are measured differentially in terms of Delta eta F, the larger of the pseudorapidity regions extending to the limits of the ATLAS sensitivity, at eta = +/- 4.9, in which no final state particles are produced above a transverse momentum threshold p_T Cut. The measurements span the region 0 < Delta eta F < 8 for 200 < p_T Cut < 800 MeV. At small Delta eta F, the data test the reliability of hadronisation models in describing rapidity and transverse momentum fluctuations in final state particle production. The measurements at larger gap sizes are dominated by contributions from the single diffractive dissociation process (pp -> Xp), enhanced by double dissociation (pp -> XY) where the invariant mass of the lighter of the two dissociation systems satisfies M_Y <~ 7 GeV. The resulting cross section is d sigma / d Delta eta F ~ 1 mb for Delta eta F >~ 3. The large rapidity gap data are used to constrain the value of the pomeron intercept appropriate to triple Regge models of soft diffraction. The cross section integrated over all gap sizes is compared with other LHC inelastic cross section measurements.

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