تقرير
First background-free limit from a directional dark matter experiment: results from a fully fiducialised DRIFT detector
| العنوان: | First background-free limit from a directional dark matter experiment: results from a fully fiducialised DRIFT detector |
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| المؤلفون: | Battat, J. B. R., Brack, J., Daw, E., Dorofeev, A., Ezeribe, A. C., Gauvreau, J. -L., Gold, M., Harton, J. L., Landers, J. M., Law, E., Lee, E. R., Loomba, D., Lumnah, A., Matthews, J. A. J., Miller, E. H., Monte, A., Mouton, F., Murphy, A. StJ., Paling, S. M., Phan, N., Robinson, M., Sadler, S. W., Scarff, A., Schuckman, F., Snowden-Ifft, D. P., Spooner, N. J. C., Telfer, S., Vahsen, S. E., Walker, D., Warner, D., Yuriev, L. |
| سنة النشر: | 2014 |
| المجموعة: | Astrophysics High Energy Physics - Experiment Physics (Other) |
| مصطلحات موضوعية: | High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Instrumentation and Detectors |
| الوصف: | The addition of O2 to gas mixtures in time projection chambers containing CS2 has recently been shown to produce multiple negative ions that travel at slightly different velocities. This allows a measurement of the absolute position of ionising events in the z (drift) direction. In this work, we apply the z-fiducialisation technique to a directional dark matter search. In particular, we present results from a 46.3 live-day source-free exposure of the DRIFT-IId detector run in this completely new mode. With full-volume fiducialisation, we have achieved the first background-free operation of a directional detector. The resulting exclusion curve for spin-dependent WIMP-proton interactions reaches 1.1 pb at 100 GeV/c2, a factor of 2 better than our previous work. We describe the automated analysis used here, and argue that detector upgrades, implemented after the acquisition of these data, will bring an additional factor of >3 improvement in the near future. Comment: 19 pages, 4 figures, 1 table |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1410.7821 |
| رقم الأكسشن: | edsarx.1410.7821 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |