BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:String--derived models and light U(1) embeddings - Mehta\, V (Univ
 ersity of Liverpool)
DTSTART:20120626T164500Z
DTEND:20120626T170000Z
UID:TALK38665@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Extra U(1) extensions of the Standard Model arising from strin
 g theory have been considered in the literature since the mid-80s. Such a 
 U(1) can play an important phenomenological role in solving the mu problem
  and suppressing other unwanted operators\, such as dimension four and fiv
 e proton decay mediating operators. Yet keeping the U(1) unbroken down to 
 low scales in quasi-realistic string models turns out to be highly non-tri
 vial. In this talk I will discuss the constraints and some scenarios in wh
 ich they may be alleviated.\n\n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
END:VEVENT
END:VCALENDAR