The LBNO long-baseline oscillation sensitivities with two conventional neutrino beams at different baselines
LBNO Collaboration, S. K. Agarwalla, L. Agostino, M. Aittola, A. Alekou, B. Andrieu, F. Antoniou, R. Asfandiyarov, D. Autiero, O. Bésida, A. Balik, P. Ballett, … 展开作者
LBNO Collaboration, S. K. Agarwalla, L. Agostino, M. Aittola, A. Alekou, B. Andrieu, F. Antoniou, R. Asfandiyarov, D. Autiero, O. Bésida, A. Balik, P. Ballett, I. Bandac, D. Banerjee, W. Bartmann, F. Bay, B. Biskup, A. M. Blebea-Apostu, A. Blondel, M. Bogomilov, S. Bolognesi, E. Borriello, I. Brancus, A. Bravar, M. Buizza-Avanzini, D. Caiulo, M. Calin, M. Calviani, M. Campanelli, C. Cantini, G. Cata-Danil, S. Chakraborty, N. Charitonidis, L. Chaussard, D. Chesneanu, F. Chipesiu, P. Crivelli, J. Dawson, I. De Bonis, Y. Declais, P. Del Amo Sanchez, A. Delbart, S. Di Luise, D. Duchesneau, J. Dumarchez, I. Efthymiopoulos, A. Eliseev, S. Emery, T. Enqvist, K. Enqvist, L. Epprecht, A. N. Erykalov, T. Esanu, D. Franco, M. Friend, V. Galymov, G. Gavrilov, A. Gendotti, C. Giganti, S. Gilardoni, B. Goddard, C. M. Gomoiu, Y. A. Gornushkin, P. Gorodetzky, A. Haesler, T. Hasegawa, S. Horikawa, K. Huitu, A. Izmaylov, A. Jipa, K. Kainulainen, Y. Karadzhov, M. Khabibullin, A. Khotjantsev, A. N. Kopylov, A. Korzenev, S. Kosyanenko, D. Kryn, Y. Kudenko, P. Kuusiniemi, I. Lazanu, C. Lazaridis, J. -M. Levy, K. Loo, J. Maalampi, R. M. Margineanu, J. Marteau, C. Martin-Mari, V. Matveev, E. Mazzucato, A. Mefodiev, O. Mineev, A. Mirizzi, B. Mitrica, S. Murphy, T. Nakadaira, S. Narita, D. A. Nesterenko, K. Nguyen, K. Nikolics, E. Noah, Yu. Novikov, A. Oprima, J. Osborne, T. Ovsyannikova, Y. Papaphilippou, S. Pascoli, T. Patzak, M. Pectu, E. Pennacchio, L. Periale, H. Pessard, B. Popov, M. Ravonel, M. Rayner, F. Resnati, O. Ristea, A. Robert, A. Rubbia, K. Rummukainen, A. Saftoiu, K. Sakashita, F. Sanchez-Galan, J. Sarkamo, N. Saviano, E. Scantamburlo, F. Sergiampietri, D. Sgalaberna, E. Shaposhnikova, M. Slupecki, D. Smargianaki, D. Stanca, R. Steerenberg, A. R. Sterian, P. Sterian, S. Stoica, C. Strabel, J. Suhonen, V. Suvorov, G. Toma, A. Tonazzo, W. H. Trzaska, R. Tsenov, K. Tuominen, M. Valram, G. Vankova-Kirilova, F. Vannucci, G. Vasseur, F. Velotti, P. Velten, V. Venturi, T. Viant, S. Vihonen, H. Vincke, A. Vorobyev, A. Weber, S. Wu, N. Yershov, L. Zambelli, M. Zito
The proposed Long Baseline Neutrino Observatory (LBNO) initially consists of $\sim 20$ kton liquid double phase TPC complemented by a magnetised iron calorimeter, to be installed at the Pyhäsalmi mine, at a distance of 2300 km from CERN. The conventional neutrino beam is produced by 400 GeV protons accelerated at the SPS accelerator delivering 700 kW of power. The long baseline provides a unique opportunity to study neutrino flavour oscillations over their 1st and 2nd oscillation maxima exploring the $L/E$ behaviour, and distinguishing effects arising from $δ_{CP}$ and matter. In this paper we show how this comprehensive physics case can be further enhanced and complemented if a neutrino beam produced at the Protvino IHEP accelerator complex, at a distance of 1160 km, and with modest power of 450 kW is aimed towards the same far detectors. We show that the coupling of two independent sub-MW conventional neutrino and antineutrino beams at different baselines from CERN and Protvino will allow to measure CP violation in the leptonic sector at a confidence level of at least $3σ$ for 50\% of the true values of $δ_{CP}$ with a 20 kton detector. With a far detector of 70 kton, the combination allows a $3σ$ sensitivity for 75\% of the true values of $δ_{CP}$ after 10 years of running. Running two independent neutrino beams, each at a power below 1 MW, is more within today's state of the art than the long-term operation of a new single high-energy multi-MW facility, which has several technical challenges and will likely require a learning curve.
The mass-hierarchy and CP-violation discovery reach of the LBNO long-baseline neutrino experiment
LBNO合作提出的下一代中微子天文台将解决粒子和天体粒子物理学中的基本问题。该实验包括一个远探测器，在其第一阶段的20千吨LAr双相TPC和磁化铁量热计，位于2300公里，从欧洲核子研究中心和近探测器的基础上的高压氩气TPC。长基线提供了一个独特的机会，研究中微子味振荡超过其第一和第二振荡最大值探索$L/E$的行为，并区分影响所产生的$δ_{CP}$和物质。在本文中，我们已经重新评估的物理潜力，确定质量等级（MH）和发现CP破坏（CPV），使用传统的中微子束从欧洲核子研究中心的SPS与功率为750千瓦。我们使用保守的假设的知识的振荡参数先验和系统的不确定性。给出了各系统误差对振荡先验精度的影响。我们证明，LBNO的第一阶段可以明确确定$>5σ$ CL的MH在整个相空间中。我们表明，统计处理的实验是非常重要的，导致的结论，LBNO有$\sim$ 100%的概率，以确定在最多4-5年的运行MH。由于MH的知识对于从数据中提取$δ_{CP}$是必不可少的，因此第一个LBNO阶段可以令人信服地提供$3σ$ C. L上CPV的证据。利用当今关于振荡参数的知识和关于系统不确定性的现实假设。
A comparison of the sensitivities of the parameters with atmospheric neutrinos for different analysis methods
在大气中微子实验中，主要的问题是通量的巨大不确定性、通量随能量增加而迅速下降、真中微子和重构中微子之间的能量和天顶角分辨率依赖于能量。这些都在一起使选择的数据合并卡方分析复杂。大型铁量能器具有高分辨率测量μ子能量和方向的能力。根据轨道在磁场中的弯曲，它还可以区分其电荷。利用Nuance软件分析了大气中微子振荡产生事件，并将电荷流相互作用中产生的μ子作为重构中微子。这实际上考虑到了广泛决议的主要问题。我们以三种方式对数据进行了分箱：i）在$\log E -\log L$平面的网格中，ii）在$\log E -\cosθ_{\rm zenith}$平面的网格中，iii）在$\log (L/E)$的分箱中。我们分别对中微子和反中微子的$Δm_{32}^2, ~θ_{13}$和$θ_{23}$方法进行了边缘化的$χ^2$研究，最后比较了结果。
Improved precision on 2-3 oscillation parameters using the synergy between DUNE and T2HK
Institute of Physics（印度物理研究所）；Homi Bhabha National Institute（霍米·巴巴国立学院）；Department of Physics & Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison（威斯康星大学麦迪逊分校物理系与威斯康星冰立方粒子天体物理中心）；Department of Physics, Utkal University（乌塔卡尔大学物理系）
