lectures - ICTP

More documents

Recommendations

Info

People have cited many reasons why the next discoveries beyond the Standard Model might involve supersymmetry (SUSY). Some of them are: • A possible cold dark matter particle • A light Higgs boson,Mh = 125.5 GeV • Unification of gauge couplings • Mathematical beauty However, they are all insignificant compared to the one really good reason: • The Hierarchy Problem 4
An analogy: Coulomb self-energy correction to the electron’s mass A point-like electron would have an infinite classical electrostatic energy. Instead, suppose the electron is a solid sphere of uniform charge density and radiusR: ∆ECoulomb = 3e2 20πǫ0R Interpreting this as a correction∆me = ∆ECoulomb/c 2 to the electron mass: me,physical = me,bare +(1MeV/c 2 ) −15 0.86×10 meters . R A divergence arises if we try to takeR → 0. Naively, we might expect R > ∼ 10 −17 meters, to avoid having to tune the bare electron mass to better than 1%, for example: 0.511MeV/c 2 = −100.000MeV/c 2 + 100.511MeV/c 2 . 5
Page 1 and 2: Supersymmetry and the LHC ICTP Summ
Page 3: Lecture 1: Motivation and Introduct
Page 7 and 8: This “reason” for the positron
Page 9 and 10: Contributions tom 2 H Dirac fermion
Page 11 and 12: The Hierarchy Problem We already kn
Page 13 and 14: Indirect couplings of the Higgs to
Page 15 and 16: Supersymmetry A SUSY transformation
Page 17 and 18: How do the Standard Model quarks an
Page 19 and 20: Why do we need two Higgs supermulti
Page 21 and 22: Recall that if supersymmetry were a
Page 23 and 24: The effective Lagrangian has the fo
Page 25 and 26: Is there any good reason why the su
Page 27 and 28: Notations for two-component (Weyl)
Page 29 and 30: Two LH Weyl spinors ξ,χ can form
Page 31 and 32: To have any chance,δψ should be l
Page 33 and 34: The auxiliary fieldF does not affec
Page 35 and 36: Covered in Lecture 1: • The Hiera
Page 37 and 38: Recall: the Wess-Zumino model Lagra
Page 39 and 40: From the conserved supercurrents on
Page 41 and 42: Masses and Interactions for Chiral
Page 43 and 44: The superpotential W = 1 2 Mij φi
Page 45 and 46: The auxiliary fieldD a is again nee
Page 47 and 48: Soft SUSY-breaking Lagrangians It h
Page 49 and 50: The Superpotential for the Minimal
Page 51 and 52: Actually, the most general possible
Page 53 and 54: Consequences if R-parity is conserv
Page 55 and 56:
Is R-parity inevitable? No! MaybeB
Page 57 and 58:
The soft SUSY-breaking Lagrangian o
Page 59 and 60:
Define mass-eigenstate Higgs bosons
Page 61 and 62:
Radiative corrections to the Higgs
Page 63 and 64:
Neutralinos The neutral higgsinos (
Page 65 and 66:
Charginos Similarly, the charged hi
Page 67 and 68:
A typical mass hierarchy for the ne
Page 69 and 70:
Squarks and Sleptons To treat these
Page 71 and 72:
Diagonalizing the top squark mass 2
Page 73 and 74:
Lecture 3: Experimental Signatures
Page 75 and 76:
Hints of an Organizing Principle Fo
Page 77 and 78:
Similarly: TheD 0 ,D 0 system const
Page 79 and 80:
The Flavor-Preserving Minimal Super
Page 81 and 82:
A reason to be optimistic that this
Page 83 and 84:
In SUSY, the potential energy can b
Page 85 and 86:
F -term breaking (continued) If you
Page 87 and 88:
Spontaneous Breaking of SUSY requir
Page 89 and 90:
The O’Raifeartaigh model has the
Page 91 and 92:
Planck-scale Mediated SUSY Breaking
Page 93 and 94:
Renormalization Group Running for a
Page 95 and 96:
Impact of the discoveryMh = 125.5 G
Page 97 and 98:
Computer programs can generate the
Page 99 and 100:
Superpartner decays: 1) Neutralino
Page 101 and 102:
2) Chargino Decays Charginos ˜Ci h
Page 103 and 104:
An important feature of gluino deca
Page 105 and 106:
5) Slepton Decays When Ñ1 is the L
Page 107 and 108:
SUSY Limits from LEP2e + e − coll
Page 109 and 110:
The LHC vs. Supersymmetric Models,
Page 111 and 112:
LHC Signals for SUSY inpp collision
Page 113 and 114:
Typical ATLAS cuts for a jets +E mi
Page 115 and 116:
A better way of showing the same li
Page 117 and 118:
For simplified model with ˜g, ˜ Q
Page 119 and 120:
Kinematically allowed decays of lig
Page 121 and 122:
Electroweak SUSY production at Hadr
Page 123 and 124:
Why has SUSY not been discovered ye
Page 125 and 126:
Natural SUSY (continued) This is ac
Page 127 and 128:
LSP mass [GeV] 800 700 600 500 400
Page 129 and 130:
However, a group of theorists (Kris
Page 131 and 132:
Stoponium A spin-0˜t1 ˜t ∗ 1 bo
Page 133 and 134:
Split SUSY Arkani-Hamed, Dimopoulos
Page 135 and 136:
R-parity violating results from CMS
Page 137 and 138:
Compressed SUSY: the limits from je
Page 139 and 140:
The LHC will eventually reach √ s
Page 141 and 142:
Direct top-squark pair production p
Page 143 and 144:
Why I am still optimistic about the
show all

lectures - ICTP

Create successful ePaper yourself

Delete template?

Save as template?