To do 10/12/09

1. Finish up Box_2_3, compile the results, try to simplify, take care of IRpole5

2. Code Box_2_4

3. Calculate q q’ -> q q’ @NLO using spinor helicity formalism, with both t’Hooft-Veltman and FDH scheme, compare the result

Status of my calculation as of 10/8/09

Right now I’m still calculating the Infrared divergence of Box Diagrams.

1. Boxes and has been done

2. Boxes and :
FORM code has been written and the result has been transferred to Maple. I have the results from Maple in terms of gamma matrices and IR-poles. Then I should work out the gamma matrices. I might also need to look into the corresponding pentagon diagrams first, instead of calculating and . And see if the IR part of and and the corresponding pentagon, add up to IR pole*Born terms.

3. Boxes
I have all the codes to calculate IR-part.(FORM, Maple:g5,g3,g)
Need to wait for the result and work out the Dirac algebra to get IR-pole*Born terms

4. Boxes
Need to figure out the scalar integrals that arise
Build the Maple codes
Simplify the dirac matrices

IR singularities

1. Determine the IR divergent diagrams using Landau condition

2. Setup codes to calculate IR divergent part of Tensoe Integral coefficient

3. Calculate the IR divergent part of the IR divergent diagrams in qq -> ttgamma channels

4. Extract the Born Amplitude

Things to Do, June 20, 2009

1. Check epsilon correction to D4 PV function

2. Implement E4(mu,nu,ro,si) reduction in Maple

3. Implement F reduction in Maple

4. Summarize one stage PV reduction for each PV function (B,C,D,E)

5. Implement numerical evaluation of tensor/scalar integral, compare with the one using FF

Check List…. 4/24/09

1. Try to figure out QQ –> gg with spinor helicity formalism, check the helicity amplitude and amplitude squared

2. Try massless spinor helicity formalism for qq–>tt gamma

3. Try massless spinor helicity formalism for gg–>tt gamma

4. Try massive spinor helicity formalism for qq–>tt gamma

5. Try massive spinor helicity formalism for gg–>tt gamma

6. Study the Passarino Veltman reduction, look at virtual corrections….

To Do List This Weekend (3/20/08)

1. Finish studying Altarelli Parisi equation from Peskin’s lecture notes.

2. HEP 1 HW…

3. Start writing HEP term paper

To Do List

1. Check previous calculations, make sure everything is correct. (Massless calculation = w/ spinor helicity formalism and recursion relations).

* spinor helicity formalism…..DONE

* recursion relation

2. Rewrite q qbar –> Q Qbar calculation…..DONE

3. Finish gg –> Q Qbar calculation (ohh it’s pain in the ass)

4. Do recursion relation for q qbar –> Q Qbar and gg –> Q Qbar

5. Finish one loop calculation for QCD (Ryder)

* Quark and gluon self energy….DONE

* Vertex correction…DONE

6. Do Peskin 16.3…DONE

7. Start reading loop calculation using unitarity cuts.

Sommerfeld Expansion

Paul Dirac Anecdote

Barusan saya ikut seminar tentang perjalanan hidup Paul Dirac (diselingi dengan sedikit ketiduran tentunya ) Menarik juga yah kehidupan seorang ilmuwan. Lalu saya sedikit browsing2 di internet, dan ketemu dengan beberapa anekdot tentang Paul Dirac semasa hidupnya. (Diambil dari sini) . Enjoy…

Penjelasan (kuasi-) politis tentang Higgs Boson

Tulisan ini adalah jawaban dari Prof. David Miller (UCL, London) ketika Science Minister-nya Inggris, William Waldegrave, menulis pertanyaan dalam secarik kertas: “What is the Higgs boson, and why do we want to find it?”