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20th LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS
27
Polarization Effects in the Search for Dark Vector Boson
at e+e- Colliders
Fei-Fan Lee1, Guey-Lin Lin2'", Vo Quang Nhat2 E-mail: aglin@nycu.edu.tw
1 Department of Physics, Jimei University, 361021, Xiamen. Fujian province, P. R. China 2Institute of Physics, National Yang Ming Chiao Tung University. Hsinchu 30010, Taiwan
Received February 22, 2022
We argue that the search for dark vector boson through e+e- ^ ZdY can determine the Lorentz structure of Zdl+l- couplings with the detection of leptonic decays Zd ^ l+l-. We assume a general framework that the dark vector boson interacts with ordinary fermions through vector and axial-vector couplings. Taking l± = we study the correlation between Zd angle relative to e- beam direction in e+e- CM frame and ^- angle relative to the boost direction of Zd in Zd rest frame. This correlation is useful for probing the Lorentz structure of Zdl+l- couplings. We discuss the measurement of such correlation in Belle II detector.
Keywords: e+e- colliders, dark vector boson, dark matter.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 319-321.
Dark Matter Annual Modulation with ANAIS-112: Three Years Results
J. Amaré1'2, S. Cebrián1'2, D. Cintas1'2, I. Coarasa1'2, E. Garcia1'2, A. Ortiz de Solorzano1'2, J. Puimedén1'2, A. Salinas1'2, M.L. Sarsa1'2, P. Villar1'2, M. Martínez1'2'3'", M.A. Olivan1'2'4, Y. Ortigoza1'2'5
E-mail: "mariam@unizar.es
1 Centro de Astropartículas y Física de Altas Energeas (CAPA), Universidad de Zaragoza
Zaragoza, 50009 Spain 2Laboratorio Subterráneo de Canfranc, Paseo de los Ayerbe. Huesca, Spain 3Fundacion ARAID. Zaragoza, 50018 Spain 4Fundacion CIRCE. Zaragoza, 50018 Spain 5Escuela Universitaria Politécnica de La Almunia de Dona Godina (EUPLA) Zaragoza, 50100 Spain Received January 17, 2022
The DAMA/LIBRA observation of an annual modulation in the detection rate compatible with that expected for dark matter is one of the most puzzling results in the present particle physics scenario. This signal is in strong tension with the negative results of other experiments. However, until recently a direct comparison using the same target material (NaI(Tl)) was lacking. ANAIS (annual modulation with NaI Scintillators) is a dark matter direct detection experiment located at the Canfranc Underground Laboratory (LSC, Spain). Its main goal is to test in a model independent way the DAMA/LIBRA positive result. ANAIS-112, consisting of 112.5 kg of NaI(Tl) scintillators, was installed at the LSC in 2017 and since then is taking data smoothly with excellent performances. Here we present the results of the annual modulation analysis corresponding to three years of ANAIS data. These results are compatible with the absence of modulation and in tension with DAMA/LIBRA result. Moreover, they support our goal of reaching a 3a sensitivity to the DAMA/LIBRA result with about 5 years of data.
Keywords: dark matter, annual modulation, scintillator detectors.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 322-326.
