LHC : the unbelievable in pursuit of the unimaginable. Kajari Mazumdar Department of Experimental High Energy Physics Tata Institute of Fundamental Research Mumbai. Eternal Questions. What principles govern energy, matter, space and time at the most elementary level?
LHC: the unbelievable in pursuit of the unimaginable
Department of Experimental High Energy Physics
Tata Institute of Fundamental Research
What lies within…?
The probe wavelength should be smaller than the distance scale to be probed: l<< h/p = hc/E
(1 TeV = 1012 electronVolt
= 1.6 * 10 -7 Joule)
LHC is the Biggest and most Expensive Science Experiment ever attempted
Price Tag: US $ 9.1 billion
No of scientists: 8000+
pushes frontiers of basic
science research and there are important spin offs.
Eg. World Wide Web!
Working Principle of a Collider Machine
What will happen in LHC
Mammoth detectors will register signals
Cosmic Recipe: How we understand the universe
Present wisdom: Behaviour of matter particles can be explained in terms of very few fundamental interactions, which might have evolved over time as the universe cooled down from a single unified one.
GRAND UNIFIED THEORY!
Standard Model (SM) of Particle Physics as of today
10 -40: 10 -5: 10-2: 1
We got to unravel the mystery of mass!
Most plausible: all fundamental particles acquire mass by interacting with an all pervading field, as a consequence, this idea also evokes another fundamental particle, the Higgs Boson!
Higgs particle not yetseen have to hunt it out in experiment.ef==a
Strategy: Heavy particles (by nature unstable) of interesting properties should show up if enough energy is gathered to produce them. (E=mc2). They were produced, existed when universe was hot.
LHC is an exploratory, high energy, high intensity machine which can produce heavy particles of mass upto few TeV.
Need accelerators for high energy in a controlled fashion in the laboratory.
The primary goal of the LHC is to find the Higgs boson…
… if it isn’t found, to find out why it isn’t there!
Most sophisticated and complex detectors with size of big buildings.
Unprecedented computing challenge to be met by GRID technology.
TIFR, Mumbai is preparing to host one of the GRID computing centres for regional scientists
Typical LHC Event
About 25 faculty,
20 students from India
Installation of detector components built in India (2006)
Extra Dimensions: String theory with Radical ideas!
What do we expect the LHC to find?
Many good reasons to discover Higgs boson and more
For the rest…
Like asking what a new continent is going to be like when we can just glimpse the shore….
Four possible scenarios
(J. Bagger et al hep-ex/0007022)
There is always the possibility that one may find something really exotic….
TransPlanckian phenomenon: Laboratory Black Holes
S.B. Giddings, S. Thomas, PRL 65 (2002) 056010 S. Dimopoulos, G. Landsberg, PRL 87 (2001) 161602
Black Hole production
In large extra dimensions Schwarzchild
radius of proton increases from 10-33 to 10-17 cm
If the impact parameter of two colliding protons is smaller than this distance, they coalesce into a micro blackhole .
It evaporates, via Hawking radiation, within 10-25 s spewing out many particles isotropically in the detector.