Particle Physics Seminars at BNL

First KATRIN results: neutrino mass and search for light sterile neutrinos

by Dr Thierry Lasserre (CEA/DSM/IRFU; Laboratorie APC; IAS Technische Universität München)

US/Eastern
Description

I will report on the neutrino mass analysis and on the light sterile neutrino search from the first four-week science run of the KATRIN experiment. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. The analysis of the spectral shape of the spectrum near the endpoint leads to an improvement over previous direct measurement of the neutrino mass, with a new upper limit of 1.1 eV at 90% C.L. Analyzing the shape of the whole spectrum down to 40 eV below the endpoint, we find no significant distortion compared to the standard model expectation. Therefore, exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results and improve the Troitsk bound. The reactor and gallium anomalies are further constrained. 

Hanyu Wei is inviting you to a scheduled Zoom meeting.

Topic: BNL Particle Physics Seminar on Jan 21 Thursday
Time: Jan 21, 2021 03:00 PM Eastern Time (US and Canada)

Join Zoom Meeting
https://fnal.zoom.us/j/97911165462?pwd=MXcrUEpOQXBGNkVjdDlDWG03Q3k5Zz09

Meeting ID: 979 1116 5462
Passcode: 795845
One tap mobile
+16465588656,,97911165462#,,,,*795845# US (New York)
+13017158592,,97911165462#,,,,*795845# US (Washington D.C)

Dial by your location
        +1 646 558 8656 US (New York)
        +1 301 715 8592 US (Washington D.C)
        +1 312 626 6799 US (Chicago)
        +1 253 215 8782 US (Tacoma)
        +1 346 248 7799 US (Houston)
        +1 669 900 6833 US (San Jose)
Meeting ID: 979 1116 5462
Passcode: 795845
Find your local number: https://fnal.zoom.us/u/aevtIg3Dre

Join by SIP
97911165462@zoomcrc.com

Join by H.323
162.255.37.11 (US West)
162.255.36.11 (US East)
115.114.131.7 (India Mumbai)
115.114.115.7 (India Hyderabad)
213.19.144.110 (Amsterdam Netherlands)
213.244.140.110 (Germany)
103.122.166.55 (Australia)
209.9.211.110 (Hong Kong SAR)
64.211.144.160 (Brazil)
69.174.57.160 (Canada)
207.226.132.110 (Japan)
Meeting ID: 979 1116 5462
Passcode: 795845

 

Organized by

Hanyu Wei