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arXiv 1606.04882hep-ph
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探测在LHC伴随重喷流的光子或Z玻色子产生中的质子内禀粲

Probing proton intrinsic charm in photon or Z boson production accompanied by heavy jets at LHC

A. V. Lipatov, G. I. Lykasov, Yu. Yu. Stepanenko, V. A. Bednyakov

摘要:

我们认为一个观察非常敏感的非零的固有魅力(IC)的质子密度的贡献。它是光子或$Z$ -玻色子和$c$ -喷流在$pp$碰撞中产生的微分截面之比,即$γ(Z) + c$,以及$γ(Z)$和$b$ -喷流的产生.结果表明,这个比例可以近似平坦或增加在大的$γ(Z)$横向动量$p_T$和他们的伪快速性$1.5 < η< 2.4$,如果考虑到IC的贡献。相反,在不存在IC的情况下,该比率随着$p_T$的增长而降低。我们还提出了集成在$p_T$的IC概率$w$的函数的横截面的比率。结果表明,这些比率大多是独立的理论上的不确定性,因此,这样的预测可能是更有前途的搜索在大型强子对撞机的内在魅力信号相比,预测$p_T$ -光谱,这显着依赖于这些不确定性。

英文摘要:

We consider an observable very sensitive to the non-zero intrinsic charm (IC) contribution to the proton density. It is the ratio between the differential cross sections of the photon or $Z$-boson and $c$-jet production in the $pp$ collision, $γ(Z) + c$, and the $γ(Z)$ and the $b$-jet production. It is shown that this ratio can be approximately flat or increasing at large $γ(Z)$ transverse momenta $p_T$ and their pseudo-rapidities $1.5 < η< 2.4$ if the IC contribution is taken into account. On the contrary, in the absence of the IC this ratio decreases as $p_T$ grows. We also present the ratios of the cross sections integrated over $p_T$ as a function of the IC probability $w$. It is shown that these ratios are mostly independent on the theoretical uncertainties, and such predictions could therefore be much more promising for the search for the intrinsic charm signal at the LHC compared to the predictions for $p_T$-spectra, which significantly depend on these uncertainties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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