Xenonnt暗物质实验的预计WIMP灵敏度

论文标题

Xenonnt暗物质实验的预计WIMP灵敏度

Projected WIMP Sensitivity of the XENONnT Dark Matter Experiment

论文作者

The XENON collaboration, Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Althueser, L., Amaro, F. D., Antochi, V. C., Angelino, E., Angevaare, J. R., Arneodo, F., Barge, D., Baudis, L., Bauermeister, B., Bellagamba, L., Benabderrahmane, M. L., Berger, T., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Capelli, C., Cardoso, J. M. R., Cichon, D., Cimmino, B., Clark, M., Coderre, D., Colijn, A. P., Conrad, J., Cussonneau, J. P., Decowski, M. P., Depoian, A., Di Gangi, P., Di Giovanni, A., Di Stefano, R., Diglio, S., Elykov, A., Eurin, G., Ferella, A. D., Fulgione, W., Gaemers, P., Gaior, R., Galloway, M., Gao, F., Grandi, L., Hasterok, C., Hils, C., Hiraide, K., Hoetzsch, L., Howlett, J., Iacovacci, M., Itow, Y., Joerg, F., Kato, N., Kazama, S., Kobayashi, M., Koltman, G., Kopec, A., Landsman, H., Lang, R. F., Levinson, L., Lin, Q., Lindemann, S., Lindner, M., Lombardi, F., Long, J., Lopes, J. A. M., Fune, E. López, Macolino, C., Mahlstedt, J., Mancuso, A., Manenti, L., Manfredini, A., Marignetti, F., Undagoitia, T. Marrodán, Martens, K., Masbou, J., Masson, D., Mastroianni, S., Messina, M., Miuchi, K., Mizukoshi, K., Molinario, A., Morå, K., Moriyama, S., Mosbacher, Y., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Odgers, K., Palacio, J., Pelssers, B., Peres, R., Pienaar, J., Pizzella, V., Plante, G., Qin, J., Qiu, H., García, D. Ramírez, Reichard, S., Rocchetti, A., Rupp, N., Santos, J. M. F. dos, Sartorelli, G., Šarčević, N., Scheibelhut, M., Schreiner, J., Schulte, D., Schumann, M., Lavina, L. Scotto, Selvi, M., Semeria, F., Shagin, P., Shockley, E., Silva, M., Simgen, H., Takeda, A., Therreau, C., Thers, D., Toschi, F., Trinchero, G., Tunnell, C., Valerius, K., Vargas, M., Volta, G., Wang, H., Wei, Y., Weinheimer, C., Weiss, M., Wenz, D., Wittweg, C., Xu, Z., Yamashita, M., Ye, J., Zavattini, G., Zhang, Y., Zhu, T., Zopounidis, J. P.

论文摘要

Xenonnt是一项暗物质直接检测实验，利用位于Infn Laboratori nazionali del Gran Sasso的5.9 t仪器氙气。在这项工作中，我们预测了实验背景，并投影了异种对检测弱相互作用的巨型颗粒（WIMP）的敏感性。电能区域的预期平均差异背景速率对应于（1，13）KEV和（4，50）电子和核后坐力的KeV，相当于$ 12.3 \ pm 0.6 $ 0.6 $（kev t y）$^{ - 1} $和$（2.2 \ pm 0.5）\ pm 0.5 \ pm 0.5）大量的。我们使用配置文件构造方法计算统一的置信区间，以确保正确覆盖。由于暴露目标为20 t $ \，$ y的预期敏感性的敏感性达到了$ 1.4 \ times10^{ - 48} $ cm $^2 $ $ 1.4 \ times10^{ - 48} $ cm $^2 $，对于50 GEV/c $^2 $^2 $ wimp的质量wimp以90％的信心水平，比当前最佳限制超过一个Xenen1的最佳限制，超过一个最佳限制。此外，我们表明，对于50 GEV/c $^2 $ WIMP，跨段以上$ 2.6 \ times10^{ - 48} $ cm $^2 $（$ 5.0 \ times10 \ times10^{ - 48} $ cm $^2 $）中间Xenonnt的发现意义超过3 $σ$（5 $σ$）。对中子（质子）的自旋依赖的wIMP耦合的预期敏感性达到$ 2.2 \ times10^{ - 43} $ cm $^2 $（$ 6.0 \ times10^{ - 42} $ cm $^2 $）。

XENONnT is a dark matter direct detection experiment, utilizing 5.9 t of instrumented liquid xenon, located at the INFN Laboratori Nazionali del Gran Sasso. In this work, we predict the experimental background and project the sensitivity of XENONnT to the detection of weakly interacting massive particles (WIMPs). The expected average differential background rate in the energy region of interest, corresponding to (1, 13) keV and (4, 50) keV for electronic and nuclear recoils, amounts to $12.3 \pm 0.6$ (keV t y)$^{-1}$ and $(2.2\pm 0.5)\times 10^{-3}$ (keV t y)$^{-1}$, respectively, in a 4 t fiducial mass. We compute unified confidence intervals using the profile construction method, in order to ensure proper coverage. With the exposure goal of 20 t$\,$y, the expected sensitivity to spin-independent WIMP-nucleon interactions reaches a cross-section of $1.4\times10^{-48}$ cm$^2$ for a 50 GeV/c$^2$ mass WIMP at 90% confidence level, more than one order of magnitude beyond the current best limit, set by XENON1T. In addition, we show that for a 50 GeV/c$^2$ WIMP with cross-sections above $2.6\times10^{-48}$ cm$^2$ ($5.0\times10^{-48}$ cm$^2$) the median XENONnT discovery significance exceeds 3$σ$ (5$σ$). The expected sensitivity to the spin-dependent WIMP coupling to neutrons (protons) reaches $2.2\times10^{-43}$ cm$^2$ ($6.0\times10^{-42}$ cm$^2$).

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