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首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at root s=7 TeV
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Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at root s=7 TeV

机译:在根s = 7 TeV的pp碰撞中测量Upsilon(1S),Upsilon(2S)和Upsilon(3S)的微分截面

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Differential cross sections as a function of transverse momentum p(T) are presented for the production of Upsilon(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9 fb(-1) in pp collisions at root s = 7 TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity vertical bar y vertical bar < 1.2 and dimuon transverse momentum in the range 10 < p(T) < 100 GeV. The measurements show a transition from an exponential to a power-law behavior at p(T) approximate to 20 GeV for the three Upsilon states. Above that transition, the Upsilon(3S) spectrum is significantly harder than that of the Upsilon(1S). The ratios of the Upsilon(3S) and Upsilon(2S) differential cross sections to the Upsilon(1S) cross section show a rise as p(T)-increases at low p(T), then become flatter at higher p(T). (C) 2015 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V.
机译:呈现出随横向动量p(T)变化的微分截面,用于产生Upsilon(nS)(n = 1、2、3)状态,并衰减成一对μ子。在LHC上使用CMS检测器收集了与根s = 7 TeV处的pp碰撞中4.9 fb(-1)的积分发光度相对应的数据。该分析选择的事件具有dimuon速度垂直条y垂直条<1.2和dimuon横向动量在10 (T)<100 GeV范围内。测量结果表明,对于三个Upsilon状态,在p(T)处从指数行为到幂律行为的过渡大约为20 GeV。在此过渡之上,Upsilon(3S)频谱比Upsilon(1S)的频谱要困难得多。 Upsilon(3S)和Upsilon(2S)的横截面与Upsilon(1S)横截面之比显示出随着p(T)在低p(T)处增加而增加,然后在较高p(T)处变得平坦。 (C)2015年CERN,以CMS协作为受益。由Elsevier B.V.发布

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