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arXiv 1107.2117hep-phhep-exnucl-th
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利用射流仓对希格斯粒子和其他粒子的理论解释

Theory Uncertainties for Higgs and Other Searches Using Jet Bins

Iain W. Stewart, Frank J. Tackmann

摘要:

从Tevatron和LHC的希格斯质量的界限确定使用专用的喷射箱,以最大限度地提高灵敏度。独家固定顺序预测的尺度变化低估了这些截面的扰动不确定性,由于取消之间的扰动校正导致大K因子和那些诱导对数敏感性的射流箱边界。为了解释这一点,我们建议应使用固定阶计算中的尺度变化来确定包容性喷流截面的理论不确定性,其差异产生排他性喷流截面。这产生了用于射流箱的理论相关矩阵,使得当添加相邻箱时,由于射流边界而导致的来自大体积的额外不确定性被消除。对H + 0、1射流、WW + 0射流和W + 0、1、2射流测试了该程序,发现其普遍适用。对于一个情况下,高阶remmation的射流边界修正是已知的,我们表明,这个过程产生固定的顺序不确定性,这是理论上一致的,在cummed计算中得到的。

英文摘要:

Bounds on the Higgs mass from the Tevatron and LHC are determined using exclusive jet bins to maximize sensitivity. Scale variation in exclusive fixed-order predictions underestimates the perturbative uncertainty for these cross sections, due to cancellations between the perturbative corrections leading to large K factors and those that induce logarithmic sensitivity to the jet-bin boundary. To account for this, we propose that scale variation in the fixed-order calculations should be used to determine theory uncertainties for inclusive jet cross sections, whose differences yield exclusive jet cross sections. This yields a theory correlation matrix for the jet bins such that the additional uncertainty from large logarithms due to the jet boundary cancels when neighboring bins are added. This procedure is tested for H + 0, 1 jets, WW + 0 jets, and W + 0, 1, 2 jets, and found to be generally applicable. For a case where the higher-order resummation of the jet boundary corrections is known, we show that this procedure yields fixed-order uncertainties which are theoretically consistent with those obtained in the resummed calculation.

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