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    • Observation of Y(1S) pair production in proton-proton collisions at s = 8 s=8 TeV

    V. Khachatryan,A. M. Sirunyan， D. Taylor, N. Woods

    Journal of High Energy Physics（2017）

    Cited 58|Views9
    Abstract
    Abstract Pair production of Y(1S) mesons is observed at the LHC in proton-proton collisions at s = 8 s=8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb−1. Both Y(1S) candidates are fully reconstructed via their decays to μ + μ −. The fiducial acceptance region is defined by an absolute Y(1S) rapidity smaller than 2.0. The fiducial cross section for the production of Y(1S) pairs, assuming that both mesons decay isotropically, is measured to be 68.8±12.7 (stat)±7.4 (syst)±2.8 ( ℬ B ) pb, where the third uncertainty comes from the uncertainty in the branching fraction of Y(1S) decays to μ + μ −. Assuming instead that the Y(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from −38% to +36%.
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    Hadron-Hadron scattering (experiments),Quarkonium
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    【要点】：CMS实验在LHC上通过质子-质子对撞观察到Y(1S)介子对的产生，并提出了一种测量其产生截面的新方法。
    

    【方法】：通过分析质子-质子对撞产生的数据样本，使用Y(1S)介子到μ+μ-的衰变进行重构。
    

    【实验】：实验在√s=8 TeV条件下进行，使用的数据样本对应于20.7 fb−1的积分亮度，测得的Y(1S)介子对产生截面为68.8±12.7 (stat)±7.4 (syst)±2.8 (ℬ) pb。