AI 中文总结
本文针对√s>500 GeV的对撞机数据，在0.2<|t|<1 GeV²范围内用类坡密子、类Odderon项拟合，发现无需稳定非零C-odd项，添加额外项也未改变结论，为Odderon振幅研究提供互补检验。
AI 中文摘要
我们研究了弹性质子-质子和质子-反质子散射在衍射 dip 区可能存在的 C 宇称为奇（C-odd）的效应。针对质心系能量√s>500 GeV的对撞机数据，在动量转移平方|t|处于0.2到1 GeV²的范围内进行拟合，采用受雷吉理论启发的简单参数化方法，描述有效 C 宇称为偶（C-even）和 C 宇称为奇（C-odd）的振幅。相对相位并非自由参数，而是由对应偶、奇贡献的符号因子确定，通过交叉对称性将每个项的实部和虚部关联起来。C-even 振幅首先由三个类坡密子（Pomeron）有效项描述，随后用多个单一项的类 Odderon 形式测试 C-odd 部分。我们发现，拟合结果并不要求存在稳定的非零 C-odd 项：当允许额外自由度时，奇贡献要么与零相容，要么约束较弱。接着我们测试，添加第四个类坡密子项或第二个类 Odderon 项是否会改变该结论。添加第四个类坡密子项带来的改进主要属于 C-even 部分，而第二个类 Odderon 项无法作为独立贡献被分辨。这些结果为近期基于标度性和解析性确定 Odderon 振幅的研究提供了互补性检验。
英文摘要
We examine possible $C$-odd effects in elastic proton-proton and proton-antiproton scattering in the diffractive dip region. Collider data with $\sqrt{s}>500$ GeV are fitted for $0.2<|t|<1~\GeV^2$, using a simple Regge-inspired parametrization of effective $C$-even and $C$-odd amplitudes. The relative phases are not left free, but are fixed by the signature factors of the corresponding even and odd contributions. In this way, the real and imaginary parts of each term are linked by crossing. The $C$-even amplitude is first described by three effective Pomeron-like terms. The $C$-odd sector is then tested with several one-term Odderon-like forms. We find that the fits do not require a stable nonzero $C$-odd term: the odd contribution is either compatible with zero or becomes weakly constrained when we allow extra freedom. We then test whether the conclusion is changed by adding either a fourth Pomeron-like term or a second Odderon-like term. The improvement obtained with the fourth Pomeron-like term is mainly $C$-even, while the second Odderon-like term is not resolved as an independent contribution. These results provide a complementary test of recent determinations of the Odderon amplitude based on scaling and analyticity.
Comments11 pages, 3 figures, 6 tables
