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arXiv 1208.4968hep-ex
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用LHC测量质子-质子碰撞中的非弹性、单衍射和双衍射截面

Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE

ALICE Collaboration

备注：
28 pages, 11 captioned figures, 8 tables, authors from page 23, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2834
发表信息：
Eur. Phys. J. C 73 (2013) 2456
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摘要：

用ALICE探测器测量了LHC能区质子-质子碰撞的非弹性和衍射过程的截面。通过研究带电粒子赝快度分布中的间隙，确定了非弹性碰撞中衍射过程的分数：对于单次衍射（衍射质量$M_X < 200$ GeV/ $c^2$）$σ_{\rm SD}/σ_{\rm INEL} = 0.21 \pm 0.03, 0.20^{+0.07}_{-0.08}$和$0.20^{+0.04}_{-0.07}$，分别在质心能量$\sqrt{s} = 0.9, 2.76$和7~TeV;对于双衍射（赝快度带隙$Δη> 3$），分别在$\sqrt{s} = 0.9, 2.76$和7~TeV处获得了$σ_{\rm DD}/σ_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$和$0.12^{+0.05}_{-0.04}$。为了测量非弹性横截面，用van der Meer扫描确定光束性质，并且使用根据数据调整的衍射模拟，获得以下值：在$\sqrt{s} =$ 2.76~TeV处的$σ_{\rm INEL} = 62.8^{+2.4}_{-4.0} (model) \pm 1.2 (lumi)$ mb和在$\sqrt{s}$ = 7~TeV处的$73.2^{+2.0}_{-4.6} (model) \pm 2.6 (lumi)$ mb。结合相对衍射率和非弹性截面计算了单、双衍射截面。的结果进行比较，以前的测量在质子-反质子和质子-质子对撞机在较低的能量，在大型强子对撞机的其他实验的测量，和理论模型。

英文摘要：

Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass $M_X < 200$ GeV/$c^2$) $σ_{\rm SD}/σ_{\rm INEL} = 0.21 \pm 0.03, 0.20^{+0.07}_{-0.08}$, and $0.20^{+0.04}_{-0.07}$, respectively at centre-of-mass energies $\sqrt{s} = 0.9, 2.76$, and 7~TeV; for double diffraction (for a pseudorapidity gap $Δη> 3$) $σ_{\rm DD}/σ_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$, and $0.12^{+0.05}_{-0.04}$, respectively at $\sqrt{s} = 0.9, 2.76$, and 7~TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: $σ_{\rm INEL} = 62.8^{+2.4}_{-4.0} (model) \pm 1.2 (lumi)$ mb at $\sqrt{s} =$ 2.76~TeV and $73.2^{+2.0}_{-4.6} (model) \pm 2.6 (lumi)$ mb at $\sqrt{s}$ = 7~TeV. The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton--antiproton and proton--proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.

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