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PICASSO对19 F上低质量WIMP相互作用的限制

Constraints on Low-Mass WIMP Interactions on 19F from PICASSO

The PICASSO Collaboration, S. Archambault, E. Behnke, P. Bhattacharjee, S. Bhattacharya, X. Dai, M. Das, A. Davour, F. Debris, N. Dhungana, J. Farine, S. Gagneb… 展开作者

The PICASSO Collaboration, S. Archambault, E. Behnke, P. Bhattacharjee, S. Bhattacharya, X. Dai, M. Das, A. Davour, F. Debris, N. Dhungana, J. Farine, S. Gagnebin, G. Giroux, E. Grace, C. M. Jackson, A. Kamaha, C. Krauss, S. Kumaratunga, M. Lafrenière, M. Laurin, I. Lawson, L. Lessard, I. Levine, C. Levy, R. P. MacDonald, D. Marlisov, J. -P. Martin, P. Mitra, A. J. Noble, M. -C. Piro, R. Podviyanuk, S. Pospisil, S. Saha, O. Scallon, S. Seth, N. Starinski, I. Stekl, U. Wichoski, T. Xie, V. Zacek

摘要:

报道了最近在SNOLAB进行的PICASSO暗物质搜索实验的结果。这些结果是使用10个探测器的子集获得的,19 F的总靶质量为0.72 kg,暴露量为114 kgd。PICASSO的低本底使反冲能阈值低至1.7 keV,这使得对质量低于10 GeV/c^2的弱相互作用大质量粒子(WIMP)的相互作用的灵敏度增加。没有发现暗物质信号,在自旋相关扇区中,当WIMP质量为20 GeV/c^2,质子的截面为σ_p^SD = 0.032 pb(90% C.L.)时,得到了最佳的排斥极限。在接近CoGeNT和DAMA/LIBRA支持的7 GeV/c2低质量区的自旋无关扇区中,大于sigma_p^SI = 1.41 × 10 ^-4 pb(90% C.L.)被排除在外。

英文摘要:

Recent results from the PICASSO dark matter search experiment at SNOLAB are reported. These results were obtained using a subset of 10 detectors with a total target mass of 0.72 kg of 19F and an exposure of 114 kgd. The low backgrounds in PICASSO allow recoil energy thresholds as low as 1.7 keV to be obtained which results in an increased sensitivity to interactions from Weakly Interacting Massive Particles (WIMPs) with masses below 10 GeV/c^2. No dark matter signal was found. Best exclusion limits in the spin dependent sector were obtained for WIMP masses of 20 GeV/c^2 with a cross section on protons of sigma_p^SD = 0.032 pb (90% C.L.). In the spin independent sector close to the low mass region of 7 GeV/c2 favoured by CoGeNT and DAMA/LIBRA, cross sections larger than sigma_p^SI = 1.41x10^-4 pb (90% C.L.) are excluded.

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