/ hep-ex arXiv:1603.03549


New measurement of $\theta_{13}$ via neutron capture on hydrogen at Daya Bay


An, F.P. (East China U. Sci. Tech., Shanghai) ; Balantekin, A.B. (Wisconsin U., Madison) ; Band, H.R. (Yale U.) ; Bishai, M. (Brookhaven) ; Blyth, S. (Natl. United U., Taiwan) ; Cao, D. (Nanjing U.) ; Cao, G.F. (Beijing, Inst. High Energy Phys.) ; Cao, J. (Beijing, Inst. High Energy Phys.) ; Cen, W.R. (Beijing, Inst. High Energy Phys.) ; Chan, Y.L. (Hong Kong, Chinese U.) ; Chang, J.F. (Beijing, Inst. High Energy Phys.) ; Chang, L.C. (Taiwan, Natl. Chiao Tung U.) ; Chang, Y. (Natl. United U., Taiwan) ; Chen, H.S. (Beijing, Inst. High Energy Phys.) ; Chen, Q.Y. (Shandong U.) ; Chen, S.M. (Tsinghua U., Beijing) ; Chen, Y.X. (Beijing, North China Elec. Power U.) ; Chen, Y. (Shenzhen U.) ; Cheng, J.H. (Taiwan, Natl. Chiao Tung U.) ; Cheng, J. (Shandong U.) ; Cheng, Y.P. (Beijing, Inst. High Energy Phys.) ; Cheng, Z.K. (Zhongshan U.) ; Cherwinka, J.J. (Wisconsin U., Madison) ; Chu, M.C. (Hong Kong, Chinese U.) ; Chukanov, A. (Dubna, JINR) ; Cummings, J.P. (Siena Coll., Loudonville) ; de Arcos, J. (IIT, Chicago) ; Deng, Z.Y. (Beijing, Inst. High Energy Phys.) ; Ding, X.F. (Beijing, Inst. High Energy Phys.) ; Ding, Y.Y. (Beijing, Inst. High Energy Phys.) ; Diwan, M.V. (Brookhaven) ; Dolgareva, M. (Dubna, JINR) ; Dove, J. (Illinois U., Urbana) ; Dwyer, D.A. (LBL, Berkeley) ; Edwards, W.R. (LBL, Berkeley) ; Gill, R. (Brookhaven) ; Gonchar, M. (Dubna, JINR) ; Gong, G.H. (Tsinghua U., Beijing) ; Gong, H. (Tsinghua U., Beijing) ; Grassi, M. (Beijing, Inst. High Energy Phys.) ; Gu, W.Q. (Shanghai, Jiao Tong U.) ; Guan, M.Y. (Beijing, Inst. High Energy Phys.) ; Guo, L. (Tsinghua U., Beijing) ; Guo, R.P. (Beijing, Inst. High Energy Phys.) ; Guo, X.H. (Beijing Normal U.) ; Guo, Z. (Tsinghua U., Beijing) ; Hackenburg, R.W. (Brookhaven) ; Han, R. (Beijing, North China Elec. Power U.) ; Hans, S. (Brookhaven) ; He, M. (Beijing, Inst. High Energy Phys.) ; Heeger, K.M. (Yale U.) ; Heng, Y.K. (Beijing, Inst. High Energy Phys.) ; Higuera, A. (Houston U.) ; Hor, Y.K. (Virginia Tech.) ; Hsiung, Y.B. (Taiwan, Natl. Taiwan U.) ; Hu, B.Z. (Taiwan, Natl. Taiwan U.) ; Hu, T. (Beijing, Inst. High Energy Phys.) ; Hu, W. (Beijing, Inst. High Energy Phys.) ; Huang, E.C. (Illinois U., Urbana) ; Huang, H.X. (Beijing, Inst. Atomic Energy) ; Huang, X.T. (Shandong U.) ; Huber, P. (Virginia Tech.) ; Huo, W. (Hefei, CUST) ; Hussain, G. (Tsinghua U., Beijing) ; Jaffe, D.E. (Brookhaven) ; Jaffke, P. (Virginia Tech.) ; Jen, K.L. (Taiwan, Natl. Chiao Tung U.) ; Jetter, S. (Beijing, Inst. High Energy Phys.) ; Ji, X.P. (Tsinghua U., Beijing) ; Ji, X.L. (Beijing, Inst. High Energy Phys.) ; Jiao, J.B. (Shandong U.) ; Johnson, R.A. (Xavier U.) ; Joshi, J. (Brookhaven) ; Kang, L. (DongGuan U. Technol.) ; Kettell, S.H. (Brookhaven) ; Kohn, S. (UC, Berkeley) ; Kramer, M. (UC, Berkeley) ; Kwan, K.K. (Hong Kong, Chinese U.) ; Kwok, M.W. (Hong Kong, Chinese U.) ; Kwok, T. (Hong Kong U.) ; Langford, T.J. (Yale U.) ; Lau, K. (Houston U.) ; Lebanowski, L. (Tsinghua U., Beijing) ; Lee, J. (LBL, Berkeley) ; Lee, J.H.C. (Hong Kong U.) ; Lei, R.T. (DongGuan U. Technol.) ; Leitner, R. (Charles U., Prague) ; Leung, J.K.C. (Hong Kong U.) ; Li, C. (Shandong U.) ; Li, D.J. (Hefei, CUST) ; Li, F. (Beijing, Inst. High Energy Phys.) ; Li, G.S. (Shanghai, Jiao Tong U.) ; Li, Q.J. (Beijing, Inst. High Energy Phys.) ; Li, S. (DongGuan U. Technol.) ; Li, S.C. (Virginia Tech.) ; Li, W.D. (Beijing, Inst. High Energy Phys.) ; Li, X.N. (Beijing, Inst. High Energy Phys.) ; Li, Y.F. (Beijing, Inst. High Energy Phys.) ; Li, Z.B. (Zhongshan U.) ; Liang, H. (Hefei, CUST) ; Lin, C.J. (LBL, Berkeley) ; Lin, G.L. (Taiwan, Natl. Chiao Tung U.) ; Lin, S. (DongGuan U. Technol.) ; Lin, S.K. (Houston U.) ; Lin, Y.C. (Taiwan, Natl. Taiwan U.) ; Ling, J.J. (Zhongshan U.) ; Link, J.M. (Virginia Tech.) ; Littenberg, L. (Brookhaven) ; Littlejohn, B.R. (IIT, Chicago) ; Liu, D.W. (Houston U.) ; Liu, J.J. (Hong Kong U.) ; Liu, J.L. (Shanghai, Jiao Tong U.) ; Liu, J.C. (Beijing, Inst. High Energy Phys.) ; Loh, C.W. (Nanjing U.) ; Lu, C. (Princeton U.) ; Lu, H.Q. (Beijing, Inst. High Energy Phys.) ; Lu, J.S. (Beijing, Inst. High Energy Phys.) ; Luk, K.B. (LBL, Berkeley) ; Lv, Z. (Xian Jiaotong U.) ; Ma, Q.M. (Beijing, Inst. High Energy Phys.) ; Ma, X.Y. (Beijing, Inst. High Energy Phys.) ; Ma, X.B. (Beijing, North China Elec. Power U.) ; Ma, Y.Q. (Beijing, Inst. High Energy Phys.) ; Malyshkin, Y. (Chile U., Catolica) ; Martinez Caicedo, D.A. (IIT, Chicago) ; McDonald, K.T. (Princeton U.) ; McKeown, R.D. (William-Mary Coll.) ; Mitchell, I. (Houston U.) ; Mooney, M. (Brookhaven) ; Nakajima, Y. (LBL, Berkeley) ; Napolitano, J. (Temple U.) ; Naumov, D. (Dubna, JINR) ; Naumova, E. (Dubna, JINR) ; Ngai, H.Y. (Hong Kong U.) ; Ning, Z. (Beijing, Inst. High Energy Phys.) ; Ochoa-Ricoux, J.P. (Chile U., Catolica) ; Olshevskiy, A. (Dubna, JINR) ; Pan, H.R. (Taiwan, Natl. Taiwan U.) ; Park, J. (Virginia Tech.) ; Patton, S. (LBL, Berkeley) ; Pec, V. (Charles U., Prague) ; Peng, J.C. (Illinois U., Urbana) ; Pinsky, L. (Houston U.) ; Pun, C.S.J. (Hong Kong U.) ; Qi, F.Z. (Beijing, Inst. High Energy Phys.) ; Qi, M. (Nanjing U.) ; Qian, X. (Brookhaven) ; Raper, N. (Rensselaer Poly.) ; Ren, J. (Beijing, Inst. Atomic Energy) ; Rosero, R. (Brookhaven) ; Roskovec, B. (Charles U., Prague) ; Ruan, X.C. (Beijing, Inst. Atomic Energy) ; Steiner, H. (LBL, Berkeley) ; Sun, G.X. (Beijing, Inst. High Energy Phys.) ; Sun, J.L. (CGNPC, Shenzhen) ; Tang, W. (Brookhaven) ; Taychenachev, D. (Dubna, JINR) ; Konstantin, T. (Dubna, JINR) ; Tsang, K.V. (LBL, Berkeley) ; Tull, C.E. (LBL, Berkeley) ; Viaux, N. (Chile U., Catolica) ; Viren, B. (Brookhaven) ; Vorobel, V. (Charles U., Prague) ; Wang, C.H. (Natl. United U., Taiwan) ; Wang, M. (Shandong U.) ; Wang, N.Y. (Beijing Normal U.) ; Wang, R.G. (Beijing, Inst. High Energy Phys.) ; Wang, W. (Zhongshan U.) ; Wang, W.W. (Nanjing U.) ; Wang, X. (Natl. U. Defense Tech., Hunan) ; Wang, Y.F. (Beijing, Inst. High Energy Phys.) ; Wang, Z. (Tsinghua U., Beijing) ; Wang, Z. (Beijing, Inst. High Energy Phys.) ; Wang, Z.M. (Beijing, Inst. High Energy Phys.) ; Wei, H.Y. (Tsinghua U., Beijing) ; Wen, L.J. (Beijing, Inst. High Energy Phys.) ; Whisnant, K. (Iowa State U.) ; White, C.G. (IIT, Chicago) ; Whitehead, L. (Houston U.) ; Wise, T. (Wisconsin U., Madison) ; Wong, H.L.H. (LBL, Berkeley) ; Wong, S.C.F. (Zhongshan U.) ; Worcester, E. (Brookhaven) ; Wu, C.H. (Taiwan, Natl. Chiao Tung U.) ; Wu, Q. (Shandong U.) ; Xia, D.M. (Beijing, Inst. High Energy Phys.) ; Xia, J.K. (Beijing, Inst. High Energy Phys.) ; Xing, Z.Z. (Beijing, Inst. High Energy Phys.) ; Xu, J.Y. (Hong Kong, Chinese U.) ; Xu, J.L. (Beijing, Inst. High Energy Phys.) ; Xu, J. (Beijing Normal U.) ; Xu, Y. (Zhongshan U.) ; Xue, T. (Tsinghua U., Beijing) ; Yan, J. (Xian Jiaotong U.) ; Yang, C.G. (Beijing, Inst. High Energy Phys.) ; Yang, H. (Nanjing U.) ; Yang, L. (DongGuan U. Technol.) ; Yang, M.S. (Beijing, Inst. High Energy Phys.) ; Yang, M.T. (Shandong U.) ; Ye, M. (Beijing, Inst. High Energy Phys.) ; Ye, Z. (Houston U.) ; Yeh, M. (Brookhaven) ; Young, B.L. (Iowa State U.) ; Yu, G.Y. (Nanjing U.) ; Yu, Z.Y. (Beijing, Inst. High Energy Phys.) ; Zhan, L. (Beijing, Inst. High Energy Phys.) ; Zhang, C. (Brookhaven) ; Zhang, H.H. (Zhongshan U.) ; Zhang, J.W. (Beijing, Inst. High Energy Phys.) ; Zhang, Q.M. (Xian Jiaotong U.) ; Zhang, X.T. (Beijing, Inst. High Energy Phys.) ; Zhang, Y.M. (Tsinghua U., Beijing) ; Zhang, Y.X. (CGNPC, Shenzhen) ; Zhang, Y.M. (Zhongshan U.) ; Zhang, Z.J. (DongGuan U. Technol.) ; Zhang, Z.Y. (Beijing, Inst. High Energy Phys.) ; Zhang, Z.P. (Hefei, CUST) ; Zhao, J. (Beijing, Inst. High Energy Phys.) ; Zhao, Q.W. (Beijing, Inst. High Energy Phys.) ; Zhao, Y.F. (Beijing, North China Elec. Power U.) ; Zhao, Y.B. (Beijing, Inst. High Energy Phys.) ; Zhong, W.L. (Beijing, Inst. High Energy Phys.) ; Zhou, L. (Beijing, Inst. High Energy Phys.) ; Zhou, N. (Hefei, CUST) ; Zhuang, H.L. (Beijing, Inst. High Energy Phys.) ; Zou, J.H. (Beijing, Inst. High Energy Phys.)

Pages: 26

Abstract: This article reports an improved independent measurement of neutrino mixing angle $\theta_{13}$ at the Daya Bay Reactor Neutrino Experiment. Electron antineutrinos were identified by inverse $\beta$-decays with the emitted neutron captured by hydrogen, yielding a data-set with principally distinct uncertainties from that with neutrons captured by gadolinium. With the final two of eight antineutrino detectors installed, this study used 621 days of data including the previously reported 217-day data set with six detectors. The dominant statistical uncertainty was reduced by 49%. Intensive studies of the cosmogenic muon-induced $^9$Li and fast neutron backgrounds and the neutron-capture energy selection efficiency, resulted in a reduction of the systematic uncertainty by 26%. The deficit in the detected number of antineutrinos at the far detectors relative to the expected number based on the near detectors yielded $\sin^22\theta_{13} = 0.071 \pm 0.011$ in the three-neutrino-oscillation framework. The combination of this result with the gadolinium-capture result is also reported.

Web-Page: http://inspirehep.net/record/1427291/files/AmC.png; http://inspirehep.net/record/1427291/files/Ed_vs_Ep_6panel.png; http://inspirehep.net/record/1427291/files/candidates_EH3.png; http://inspirehep.net/record/1427291/files/eff_vs_baseline.png; http://inspirehep.net/record/1427291/files/measpred_ratio.png; http://inspirehep.net/record/1427291/files/measpred_ratio_vs_baseline.png; http://inspirehep.net/record/1427291/files/spallnGd_EH1.png; http://inspirehep.net/record/1427291/files/Ed_nearfar.png; http://inspirehep.net/record/1427291/files/spallnH_EH1_pol2a.png; http://inspirehep.net/record/1427291/files/nGdTimeFit.png; http://inspirehep.net/record/1427291/files/nHTimeFit.png; http://inspirehep.net/record/1427291/files/spalln_fit.png; http://inspirehep.net/record/1427291/files/singlesRate.png; http://inspirehep.net/record/1427291/files/Ed_peakScale_02.png; http://inspirehep.net/record/1427291/files/distanceEffDiff.png; http://inspirehep.net/record/1427291/files/Li9_fit.png; http://inspirehep.net/record/1427291/files/IBD_vs_time.png; http://inspirehep.net/record/1427291/files/timeDistrAccValid.png; http://inspirehep.net/record/1427291/files/timeEffDiff.png; http://inspirehep.net/record/1427291/files/distanceDistrAccValid.png; http://inspirehep.net/record/1427291/files/spallnRatio_diff.png; http://inspirehep.net/record/1427291/files/spalln_sim.png; http://inspirehep.net/record/1427291/files/AD0.png; http://inspirehep.net/record/1427291/files/arXiv:1603.03549.pdf


Note: 26 pages, 23 figures

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