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首页> 外文期刊>Physical review letters >Scattering Studies with Low-Energy Kaon-Proton Femtoscopy in Proton-Proton Collisions at the LHC
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Scattering Studies with Low-Energy Kaon-Proton Femtoscopy in Proton-Proton Collisions at the LHC

机译:大型强子对撞机质子-质子碰撞中低能钾质子质子检查技术的散射研究

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摘要

The study of the strength and behavior of the antikaon-nucleon ((K) over bar N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K+ p circle plus K- (p) over bar) and (K- p circle plus K+ (p) over bar) pairs measured in pp collisions at root s = 5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58 MeV/c in the measured correlation function of (K- p circle plus K+ (p) over bar) with a significance of 4.4 sigma constitutes the first experimental evidence for the opening of the ((K) over bar (0)(n) circle plus K-0 (n) over bar) breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Julich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the (K) over barN threshold for low-energy QCD chiral models.
机译:对反钾-核子((K)在N棒上)相互作用的强度和行为的研究是低能量子色动力学(QCD)中陌生领域的关键焦点之一。在这封信中,提出了一种独特的高精度测量方法,用于接近和超过运动学阈值的质子和质子之间的强相互作用。在根s pp碰撞中以(K + p圈加K-(p)跨过)和(K-p圈加K +(p)跨对)的低对框架相对动量的飞秒测量在根s处的pp碰撞中测量= 5、7和13 TeV。在(K-p圈加上K +(p)超过bar的实测相关函数中)相对动量为58 MeV / c时观察到的结构,其显着性为4.4 sigma,构成了((K )()(0)(n)圈上方加K-0(n)(bar上方)打破通道,这是由于带电和中性钾离子之间的质量差异所致。除库仑电势外,还已将测得的相关函数与Julich和Kyoto模型进行了比较。这项工作中提出的低相对动量的高精度数据证明了飞影技术是散射实验的有力补充工具,并为低能QCD手性模型提供了高于barN阈值(K)以上的新约束。

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