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首页> 外文期刊>Physical review, D >Exclusive and semiexclusive production of μ+μ? pairs with Δ isobars and other resonances in the final state and the size of absorption effects
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Exclusive and semiexclusive production of μ+μ? pairs with Δ isobars and other resonances in the final state and the size of absorption effects

机译：μ+μ？的排他和半排他生产？在最终状态下与Δ等压线对和其他共振对以及吸收效应的大小

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We include p p → p Δ + μ + μ ? and p p → Δ + Δ + μ + μ ? processes in addition to the standard p p → p p μ + μ ? process both in equivalent-photon approximation (EPA) and in exact 2 → 4 calculations. For comparison we calculate also the continuum proton dissociation in a recently developed k t -factorization approach to γ γ -involved processes with parametrizations of F 2 structure function known from the literature. The calculated cross section including all the processes is considerably larger than the one measured recently by the ATLAS collaboration. We calculate absorption effects for p p → p p μ + μ ? process in the momentum space. The final cross section with absorption effects is by 10% larger than the one measured by the ATLAS collaboration which is difficult to explain. Several differential distributions with the ATLAS experimental cuts are presented. It is shown that the processes with electromagnetic p → Δ ( 1232 ) and p → N ( 1440 ) transitions, that have similar characteristics as the p p → p p μ + μ ? process, increase the cross section for μ + μ ? production and thus can affect its theoretical interpretation when the leading baryons are not detected as is the case for the CMS and ATLAS measurements. The mechanism of dissociation into hadronic continuum is not under full control as the corresponding absorption effects are not fully understood. We present first predictions for future ATLAS experiment with the ALFA subdetectors and discuss observables relevant for this measurement.
机译：我们包括p p→pΔ+μ+μ？ p p→Δ+Δ+μ+μ？除了标准p p→p pμ+μ？以等效光子近似（EPA）和精确的2→4计算进行处理。为了进行比较，我们还用文献中已知的F 2结构函数的参数化方法，以最近发展的k t分解方法对涉及γγ的过程计算了连续质子解离。计算得出的包括所有过程的横截面都比ATLAS合作机构最近测量的横截面大得多。我们计算p p→p pμ+μ？动量空间中的过程。具有吸收作用的最终横截面比ATLAS合作测量的横截面大10％，这很难解释。介绍了ATLAS实验切割的几种差异分布。结果表明，具有电磁p→Δ（1232）和p→N（1440）跃迁的过程具有与p p→p pμ+μ？过程中，增加横截面的μ+μ？如果未检测到领先的重子，则可能会影响其理论解释，就像CMS和ATLAS测量一样。解离为强子连续体的机制尚未完全控制，因为尚未充分理解相应的吸收作用。我们为ALFA子探测器提供了未来ATLAS实验的初步预测，并讨论了与此测量相关的可观察物。

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