Naturalness after LHC8

Abstract: I review the status of naturalness of the weak scale after the results from the LHC operating at an energy of 8 TeV. Talk delivered at the 2013 Europhysics Conference on High Energy Physics (EPS), Stockholm, Sweden, 18-24 July 2013.

 

رفرنس ۳۳ ام اين مقاله، مقاله اي است به قلم سخنران پس فرداي ما. اطلاعات سخنراني را در زير برايتان باز نويسي مي كنم:

Time: Tuesday, 15th of Mordad (Aug 6), 3pm

Place: Physics Seminar Room, Farmanieh

Speaker: Dr. Mehrdad Mirbabayi (recently graduated from NYU, to join IAS)

Title: Natural Tuning: Towards A Proof of Concept
«كوك طبيعي: مصداقي براي يك مدعا»

Abstract:
The cosmological constant problem and the absence of new natural
physics at the electroweak scale, if confirmed by the LHC, may either
indicate that the nature is fine-tuned or that a refined notion of
naturalness is required. We construct a family of toy UV complete
quantum theories providing a proof of concept for the second
possibility. Low energy physics is described by a tuned effective
field theory, which exhibits relevant interactions not protected by
any symmetries and separated by an arbitrary large mass gap from the
new "gravitational" physics, represented by a set of irrelevant
operators. Nevertheless, the only available language to describe
dynamics at all energy scales does not require any fine-tuning. The
interesting novel feature of this construction is that UV physics is
not described by a fixed point, but rather exhibits asymptotic
fragility. Observation of additional unprotected scalars at the LHC
would be a smoking gun for this scenario. Natural tuning also favors
TeV scale unification‫.