标题： B→ M ν\bar ν（M= π, K, ρ, K^*）衰变和无轻子Z^\prime 模型 显示英文标题

标题： Exclusive B-> M ν\barν (M= π, K, ρ, K^*) Decays and Leptophobic Z^\prime Model

摘要： 我们考虑在无轻子耦合的Z^\prime 模型中，B -> M\nu \bar{\nu} (M=\pi , K,\rho , K^*) 的独占味改变中性电流过程，在该模型中，带电轻子不与额外的Z^\prime 玻色子耦合。 我们发现这些独占模式对于约束无轻子耦合的Z^\prime 模型非常有效。 在无轻子排斥的Z^\prime 模型中，引入了额外的右旋中微子，它们可以对B -> M + E_missing衰变中的缺失能量信号做出贡献。 通过显式计算，我们从已有的实验数据中获得了该模型参数的非常严格的限制，|U_{sb}^{Z^\prime }| \leq 0.29和|U_{数据库}^{Z^\prime }| \leq 0.61。 我们还简要讨论了大质量右旋中微子这一有趣的问题，这可能与暗物质问题有关。 显示英文摘要

摘要： We consider the exclusive flavor changing neutral current processes B -> M \nu \bar{\nu} (M= \pi, K, \rho, K^*) in the leptophobic Z^\prime model, in which the charged leptons do not couple to the extra Z^\prime boson. We find that these exclusive modes are very effective to constrain the leptophobic Z^\prime model. In the leptophobic Z^\prime model, additional right-handed neutrinos are introduced and they can contribute to the missing energy signal in B -> M + E_missing decays. Through the explicit calculations, we obtain quite stringent bounds on the model parameters, |U_{sb}^{Z^\prime}| \leq 0.29 and |U_{db}^{Z^\prime}| \leq 0.61, from the already existing experimental data. We also briefly discuss an interesting subject of massive right-handed neutrinos, which might be connected with the dark matter problem.