KLOE 实验对 CP 破坏衰变 $K_S \to 3\pi^0$ 的新限制
高能物理 - 实验
2013-05-24 v2
摘要
我们利用 KLOE 探测器在 -工厂 DAFNE 收集的 1.7 fb 碰撞数据，对 CP 破坏衰变 进行了新的直接搜寻。我们在约 个 事件样本中搜寻该衰变，通过 在量能器中的相互作用标记 ，并要求六个瞬发光子。与之前的搜寻相比，分析得到了改进：标记样本增加了四倍，并且更有效地抑制了虚假 标记和杂散簇的背景。我们在数据和模拟背景样本中均未发现候选事例，而预期有 0.12 个标准模型事例。通过归一化到同一样本中的 事件数，我们设定了 (90% C.L.) 的上限，比之前的限制低了五倍。我们还设定了参数 的上限 (90% C.L.)，将最新的直接测量结果提高了一倍。
引用
@article{arxiv.1301.7623,
title = {A new limit on the CP violating decay KS -> 3pi0 with the KLOE experiment},
author = {D. Babusci and D. Badoni and I. Balwierz-Pytko and G. Bencivenni and C. Bini and C. Bloise and F. Bossi and P. Branchini and A. Budano and L. Caldeira Balkestahl and G. Capon and F. Ceradini and P. Ciambrone and F. Curciarello and E. Czerwinski and E. Dane and V. De Leo and E. De Lucia and G. De Robertis and A. De Santis and A. Di Domenico and C. Di Donato and R. Di Salvo and D. Domenici and O. Erriquez and G. Fanizzi and A. Fantini and G. Felici and S. Fiore and P. Franzini and P. Gauzzi and G. Giardina and S. Giovannella and F. Gonnella and E. Graziani and F. Happacher and L. Heijkenskjold and B. Hoistad and L. Iafolla and M. Jacewicz and T. Johansson and K. Kacprzak and A. Kupsc and J. Lee-Franzini and B. Leverington and F. Loddo and S. Loffredo and G. Mandaglio and M. Martemianov and M. Martini and M. Mascolo and R. Messi and S. Miscetti and G. Morello and D. Moricciani and P. Moskal and F. Nguyen and A. Passeri and V. Patera and I. Prado Longhi and A. Ranieri and C. F. Redmer and P. Santangelo and I. Sarra and M. Schioppa and B. Sciascia and M. Silarski and C. Taccini and L. Tortora and G. Venanzoni and W. Wislicki and M. Wolke and J. Zdebik},
journal= {arXiv preprint arXiv:1301.7623},
year = {2013}
}
备注
Accepted for publication in Physics Letters B (15 pages, 13 figures)