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Q:
What is the hot subject/topic in particle physics these days?
A:
The answer to this question depends
on what type of particle physics you are interested in.
In theoretical high-energy particle physics, which is the name usually
given to theories attempting to unify the force of gravity with the
other 3 known forces (electromagnetic, strong and weak forces), the
hottest theories are string theory:
http://superstringtheory.com/
In astronomy/cosmology, a hot topic is the search for the identity of
dark matter, which makes up approximately 25% of the "stuff" of the
Universe. Try the Cosmology Primer of Professor Sean Carroll
at the University of Chicago:
http://pancake.uchicago.edu/%7Ecarroll/cfcp/primer/
Particularly relevant to your question is "The Dark Universe" link, the
fifth link on his list. He describes the candidates for dark matter
particles there. The Chandra Q&A pages also touch on this subject, for
example:
http://chandra.harvard.edu/resources/faq/dmatter/dmatter-9.html
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