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arXiv 1201.4640hep-ph
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在LHC上通过Reggeized胶子产生包含的b-jet和b \bar b-dijet

Inclusive b-jet and b\bar b-dijet production at the LHC via Reggeized gluons

Vladimir Saleev, Alexandra Shipilova

摘要:

我们在CERN LHC上研究了包含的$b$ -喷流和$b\bar b$ -双喷流的产生,并引用了高能下$t$ -通道交换中胶子Regge化的假设. $b$ -喷流截面包括开放$b$ -夸克产生和通过胶子-底对碎裂产生的$b$ -夸克产生的贡献。计算了在多Regge运动学和准多Regge运动学下,用欧洲核子研究中心(CERN)LHC的ATLAS探测器测量的不同快度范围内的包含$b$喷流产生的横动量分布。$b\bar b$ -双射流截面在准多Regge运动学中作为双射流不变质量$M_{jj}$、两个射流之间的方位角$Δϕ$和角度变量$χ$的函数进行计算。在数值计算中,我们采用Kimber-Martin-Ryskin和Blümlein公式,从共线质子出发,利用Martin-Roberts-Stirling-Thorne集,导出了未积分的质子胶子分布函数。我们发现,在强子c.m.上,我们与ATLAS和CMS合作在LHC上的测量结果很好地吻合。$\sqrt S=7$的能量TeV。

英文摘要:

We study inclusive $b$-jet and $b\bar b$-dijet production at the CERN LHC invoking the hypothesis of gluon Reggeization in $t$-channel exchanges at high energy. The $b$-jet cross section includes contributions from open $b$-quark production and from $b$-quark production via gluon-to-bottom-pair fragmentation. The transverse-momentum distributions of inclusive $b$-jet production measured with the ATLAS detector at the CERN LHC in different rapidity ranges are calculated both within multi-Regge kinematics and quasi-multi-Regge kinematics. The $b\bar b$-dijet cross-section is calculated within quasi-multi-Regge kinematics as a function of the dijet invariant mass $M_{jj}$, the azimuthal angle between the two jets $Δϕ$ and the angular variable $χ$. At the numerical calculation, we adopt the Kimber-Martin-Ryskin and Blümlein prescriptions to derive unintegrated gluon distribution function of the proton from its collinear counterpart, for which we use the Martin-Roberts-Stirling-Thorne set. We find good agreement with measurements by the ATLAS and CMS Collaborations at the LHC at the hadronic c.m.\ energy of $\sqrt S=7$ TeV.

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