论文标题
在$ \ sqrt {s} $ = 7 tev的PP碰撞中生产$ω$梅森
Production of $ω$ mesons in pp collisions at $\sqrt{s}$ = 7 TeV
论文作者
论文摘要
在$ \ sqrt {Sqrt {s} $ = 7 TEV测量的PP碰撞中，以$ \ sqrt {s} $ = 7 TEV在LHC上以LHC在LHC上测量了LHC的LHC，在lhc的横向动量范围为2 <$ p _ p _ c _ $ p _ c} $ p _ colliant（782）$ MESON的生产（$ | y | <0.5 $）在PP碰撞中以$ \ sqrt {s} $ = 7 TEV测量的Alice探测器在LHC的横向动量范围内在2 <$ P _ p _ p _ $ p _ c} $ c} $ c} $ p _ { $ω$ MESON是通过其$ω\rightarrowπ^+π^-π^0 $衰减通道重建的。测量的$ω$生产横截面与各种计算进行了比较：Pythia 8.2 Monash 2013描述了数据，而Pythia 8.2 Tune 4c 4C高估了数据约50％。最近的NLO计算包括一个描述整个矢量 - 梅森非ET碎片的模型，它描述了低于6 GEV/$ C $的不确定性中的数据，而该数据的数据高于较高的$ p _ {\ rm {t}} $的数据高达50％。 $ω/π^0 $比率与下碰撞能和毕达县计算时的先前测量值一致。此外，该测量与测量的$ p _ {\ rm {t}} $范围内的横向质量缩放兼容，并且比率与$ c^{ω/π^{0}} $ = 0.67 $ = 0.67 $ \ pm $ 0.03（stat）$ \ $ \ $ \ pm \ pm \ pm $ 0.04（sys）（sys $ 0.04（sys））以上是2.5 g/2.5 g/g/c。
The invariant differential cross section of inclusive $ω(782)$ meson production at midrapidity ($|y|<0.5$) in pp collisions at $\sqrt{s}$ = 7 TeV was measured with the ALICE detector at the LHC over a transverse momentum range of 2 < $p_{\rm{T}}$ < 17 GeV/$c$. The $ω$ meson was reconstructed via its $ω\rightarrowπ^+π^-π^0$ decay channel. The measured $ω$ production cross section is compared to various calculations: PYTHIA 8.2 Monash 2013 describes the data, while PYTHIA 8.2 Tune 4C overestimates the data by about 50%. A recent NLO calculation, which includes a model describing the fragmentation of the whole vector-meson nonet, describes the data within uncertainties below 6 GeV/$c$, while it overestimates the data by up to 50% for higher $p_{\rm{T}}$. The $ω/π^0$ ratio is in agreement with previous measurements at lower collision energies and the PYTHIA calculations. In addition, the measurement is compatible with transverse mass scaling within the measured $p_{\rm{T}}$ range and the ratio is constant with $C^{ω/π^{0}}$ = 0.67 $\pm$ 0.03 (stat) $\pm$ 0.04 (sys) above a transverse momentum of 2.5 GeV/$c$.
