利用XENON100四年数据搜索电子反冲事件率调制
Search for Electronic Recoil Event Rate Modulation with 4 Years of XENON100 Data.
作者信息
Aprile E, Aalbers J, Agostini F, Alfonsi M, Amaro F D, Anthony M, Arneodo F, Barrow P, Baudis L, Bauermeister B, Benabderrahmane M L, Berger T, Breur P A, Brown A, Brown E, Bruenner S, Bruno G, Budnik R, Bütikofer L, Calvén J, Cardoso J M R, Cervantes M, Cichon D, Coderre D, Colijn A P, Conrad J, Cussonneau J P, Decowski M P, de Perio P, Di Gangi P, Di Giovanni A, Diglio S, Eurin G, Fei J, Ferella A D, Fieguth A, Franco D, Fulgione W, Gallo Rosso A, Galloway M, Gao F, Garbini M, Geis C, Goetzke L W, Greene Z, Grignon C, Hasterok C, Hogenbirk E, Itay R, Kaminsky B, Kessler G, Kish A, Landsman H, Lang R F, Lellouch D, Levinson L, Lin Q, Lindemann S, Lindner M, Lopes J A M, Manfredini A, Maris I, Marrodán Undagoitia T, Masbou J, Massoli F V, Masson D, Mayani D, Messina M, Micheneau K, Miguez B, Molinario A, Murra M, Naganoma J, Ni K, Oberlack U, Pakarha P, Pelssers B, Persiani R, Piastra F, Pienaar J, Pizzella V, Piro M-C, Plante G, Priel N, Rauch L, Reichard S, Reuter C, Rizzo A, Rosendahl S, Rupp N, Dos Santos J M F, Sartorelli G, Scheibelhut M, Schindler S, Schreiner J, Schumann M, Scotto Lavina L, Selvi M, Shagin P, Silva M, Simgen H, Sivers M V, Stein A, Thers D, Tiseni A, Trinchero G, Tunnell C, Wang H, Wei Y, Weinheimer C, Wulf J, Ye J, Zhang Y
机构信息
Physics Department, Columbia University, New York, New York 10027, USA.
Nikhef and the University of Amsterdam, Science Park, 1098XG Amsterdam, The Netherlands.
出版信息
Phys Rev Lett. 2017 Mar 10;118(10):101101. doi: 10.1103/PhysRevLett.118.101101. Epub 2017 Mar 6.
We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over a period of 4 yr, from January 2010 to January 2014. A profile likelihood method, which incorporates the stability of the XENON100 detector and the known electronic recoil background model, is used to quantify the significance of periodicity in the time distribution of events. There is a weak modulation signature at a period of 431_{-14}^{+16} day in the low energy region of (2.0-5.8) keV in the single scatter event sample, with a global significance of 1.9σ; however, no other more significant modulation is observed. The significance of an annual modulation signature drops from 2.8σ, from a previous analysis of a subset of this data, to 1.8σ with all data combined. Single scatter events in the low energy region are thus used to exclude the DAMA/LIBRA annual modulation as being due to dark matter electron interactions via axial vector coupling at 5.7σ.
我们报告了对XENON100在2010年1月至2014年1月这4年期间积累的数据中电子反冲事件率调制特征的搜索。一种结合了XENON100探测器稳定性和已知电子反冲背景模型的轮廓似然方法，用于量化事件时间分布中周期性的显著性。在单散射事件样本中，能量范围为(2.0 - 5.8)keV的低能区域，存在一个周期为431_{-14}^{+16}天的微弱调制特征，全局显著性为1.9σ；然而，未观察到其他更显著的调制。年度调制特征的显著性从之前对该数据子集的分析中的2.8σ降至所有数据合并后的1.8σ。因此，低能区域的单散射事件被用于以5.7σ的置信度排除DAMA/LIBRA年度调制是由暗物质通过轴矢量耦合与电子相互作用引起的可能性。
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