Comparison of differential elastic cross sections in $pp$ and $p\bar{p}$ collisions as evidence of the existence of the colourless $C$-odd three-gluon state

旁观者模型中的 T-odd 胶子分布函数

T-odd gluon distribution functions in a spectator model

本文在旁观者模型中计算核子胶子的 T-odd 横动量依赖分布，通过谱函数赋予旁观者连续质量，并以单次胶子交换建模末态相互作用。

Low mass New Physics search for a CP-odd Higgs boson $A^0$ deacying to $s\bar s$ or gluon gluon at BaBar

We report on the search for the decay $Υ(1S) \to γA^0$, $A^0 \to gg$ or $s\bar s$, where $A^0$ is the pseudoscalar light Higgs boson predicted by the next-to-minimal supersymmetric standard model. A sample of $\sim 18 \times 10^6$ $Υ(1S)$ resonances, produced in the BaBar experiment via $e^+e^- \to Υ(2S) \to π^+π^-Υ(1S)$, is used for this search. No significant signal has been found, and upper limits at the $90\%$ of confidence level are set on the product branching fraction of the process.

利用T-odd TMD胶子密度进行质子三维重建

Proton 3D reconstruction with T-odd TMD gluon densities

本文通过旁观者模型计算自旋依赖TMD胶子密度，引入基于拟合的旁观者质量调制函数，重点研究Boer-Mulders和Sivers函数，以推动质子三维胶子结构重建。

Forward elastic scattering: Dynamical gluon mass and semihard interactions

The role of low-$x$ parton dynamics in dictating the high-energy behavior of forward scattering observables at LHC energies is investigated using a QCD-based model with even-under-crossing amplitude dominance at high-energies. We explore the effects of different sets of pre- and post-LHC fine-tuned parton distributions on the forward quantities $σ_{tot}$ and $ρ$, from $pp$ and $\bar{p}p$ scattering in the interval 10 GeV - 13 TeV. We also investigate the role of the leading soft contribution, the low-energy cuttoff, and the energy dependence of the semihard form factor on these observables. We…

Non-perturbative renormalization scheme for the CP-odd three-gluon operator

We define a regularization-independent momentum-subtraction scheme for the $CP$-odd three-gluon operator at dimension six. This operator appears in effective field theories for heavy physics beyond the Standard Model, describing the indirect effect of new sources of $CP$-violation at low energies. In a hadronic context, it induces permanent electric dipole moments. The hadronic matrix elements of the three-gluon operator are non-perturbative objects that should ideally be evaluated with lattice QCD. We define a non-perturbative renormalization scheme that can be implemented on the lattice and …

$CP$-奇三胶子算符到梯度流的单圈匹配

One-loop matching of the $CP$-odd three-gluon operator to the gradient flow

本文给出了CP奇三胶子算符在两种最小减除方案与梯度流之间的单圈匹配系数，完成了低能有效场论中所有CP破坏味守恒算符的单圈匹配，为计算中子电偶极矩提供关键输入。

Weinberg operator contribution to the CP-odd nuclear force in the quark model

The contribution of the CP violating three-gluon interaction, proposed by Weinberg, to the short-range CP-odd nuclear force is evaluated in the nonrelativistic quark model. We first show that the naive leading contribution generated by the quark exchange process vanishes at sufficiently short distance within the resonating group method, by considering the one-loop level gluon exchange CP-odd interquark potential induced by the Weinberg operator with massive quarks and gluons. We then estimate the true leading contribution by evaluating the gluonic correction to the CP-odd interquark potential …

Diffractive Photoproduction of Eta_c

Diffractive photoproduction of $η_c$ is an important process to study the effect of Odderon, whose existence is still not confirmed in experiment. A detailed interpretation of Odderon in QCD, i.e., in terms of gluons is also unclear.Taking charm quarks as heavy quarks, we can use NRQCD and take $η_c$ as a $c\bar c$ bound state. Hence, in the production of $η_c$a free $c\bar c$ pair is first produced and this pair is transformed into $η_c$ subsequently.In the forward region of the kinematics, the $c\bar c$ pair interacts with initial hadron through exchanges of soft gluons. This interaction can…

QCD evolution of naive-time-reversal-odd parton distribution functions

We reexamine the derivation of the leading order QCD evolution equations of twist-3 quark-gluon correlation functions, $T_{q,F}(x,x)$ and $T^{(σ)}_{q,F}(x,x)$, which are the first transverse-momentum-moment of the naive-time-reversal-odd parton distribution functions - the Sivers and Boer-Mulders function, respectively. The evolution equations were derived by several groups with apparent differences. We identify the sources that are responsible for the differences, and are able to reconcile the results from various groups.

对odderon交换实验证据的新审视

Fresh look at experimental evidence for odderon exchange

本研究基于连分数插值与统计抽样方法，对比D0与TOTEM等实验数据，发现p pbar与pp截面在衍射极小值附近存在(2.2-2.6)σ差异，为odderon存在提供了证据，结合其他证据可达(4.0-5.2)σ信号。

Recent Results from the CERN LHC Experiment TOTEM -- Implications for Odderon Exchange

Recent results are summarized from the TOTEM experiment at CERN LHC, including measurements of the total, elastic and inelastic cross-sections, the nuclear slope parameter $B$, the differential cross-section of elastic scattering and the real to imaginary part ration $ρ$ at $\sqrt{s} = $ 2.76 and 13 TeV. The implications of these data for Odderon (odd-gluon colorless) exchange are discussed.

利用ATLAS探测器在$\sqrt{s} = 13$ TeV质子-质子对撞中寻找衰变为一对$τ$轻子的轻CP-odd希格斯玻色子

Search for a light CP-odd Higgs boson decaying into a pair of $τ$-leptons in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

本研究利用ATLAS探测器在13 TeV质子-质子对撞数据中寻找质量20-90 GeV的轻CP-odd希格斯玻色子，未观测到显著超出标准模型背景的事例，给出了味对齐双希格斯二重态模型解释及模型无关的产生截面95%置信水平上限。