ELFT HÍRADÓ

[StatFizSzeminar <statfiz AT glu.elte.hu>]

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                   ELTE Institute of Physics
                            Joint
                 SEMINAR IN STATISTICAL PHYSICS
                             and
                  SEMINAR IN PARTICLE PHYSICS


                     The SECOND lecture on
                         22nd June 2016


                        Wednesday, 14:15
                           Room 7.59
                      (on the 7th floor!)

                    Attila J. Krasznahorkay

   Institute for Nuclear Research, Hungarian Academy of Sciences

               "On the track of the dark forces"


Electron-positron angular correlations were measured for the magnetic dipole
17.6 MeV and the 18.15 MeV transitions in 8Be. Significant enhancement 
relative
to the internal pair creation was observed at large angles in the angular
correlation for the 18.15 MeV transition with a confidence level of > 5sigma.
This observation might indicate that, in an intermediate step, a neutral
particle with a mass of 16.70 MeV/c^2 was created. In January we reported the
above anomaly in Physical Review Letters, but at first, few took notice. That
changed in April with a paper by Jonathan Feng, a theoretical particle
physicist, who presented their work with the title of: ``Evidence for a
Protophobic Fifth Force from 8Be Nuclear Transitions'', which was followed by 
an
article in Nature with a title of: ``Has a Hungarian physics lab found a fifth
force of nature?'' Such an article produced a boom in the media. The proposed
boson has become lunch-table talk in physics departments far and wide, and 
plans
are afoot for testing the idea. If the particle is confirmed, that would
completely upend our understanding of the universe. I am going to show the
reliability of the data, place such a particle into context with other
experimental results and discuss the implications of the results.


        1117, Budapest, Pázmány P. sétány 1/A (Északi tömb)
                honlap: http://glu.elte.hu/~statfiz

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