Cross section for e+e- -> c cbar

More Prasanth Krishnan's questions See All

Least Count & Error analysis (Off Topic but please do answer if you know the answer!)

Suppose Least Count (LC) for some apparatus say 0.1 . But often we used to write 0.1/2 as least count. How this factor "1/2" come into the picture of LC ? We cannot able to measure anything beyond...

07 August 2013 8,433 6 View

How to find Inverted Argus function?

Argus function = x . (1 - (x/m)^2))^p . exp(-c.(1-(x/m)^2), where m, p, c are some parameters . If we plot this function, we get a long tail (linear) and then a quadratic one. I want to invert...

03 April 2013 474 0 View

Can you connect an HPLC to a Mass Spec only at a certain time point?

Can anyone explain this method? Especially the last statement where it says only at 1.5 to 2.5mins was the MS/MS connected to the UPLC. How is that possible, is it a feature in this specific...

11 August 2024 8,141 3 View

How to develop investments in renewable energy sources?

08 August 2024 5,112 3 View

1. If I can quantize the atom using this hyperbolic spiral and classical physics, could nature do the same?

If we map as a continuous motion an ionising electron (beginning its journey at n=1) in an H atom, a specific hyperbolic spiral appears (see animation). When we solve this spiral formula, we find...

07 August 2024 5,343 2 View

How are iso-frequency contours plotted?

Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...

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Separation of organic acids-HPLC?

Hello What should be done to separate and identify organic acids in HPC when their RetTime is the same?Like oxalic acid with Propanoic Acid.or acids that have a very close RetTime.

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RNA later for the preservation of RNA in fecal samples at room temperature for one day (37°C)?

I am planning to collect human fecal samples for metatranscriptomic analysis using MGI. These samples are from indigenous people living in a region with high temperatures. I will have access to a...

06 August 2024 1,367 3 View

Which distribution type should I use when calculating the average particle size from TEM image? and how to calculate the error ?

average particle size calculation from TEM

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Who of all the Global Scientific community will help me Prof. Dr. Yoshida make way for TPEOM, MEC ~EMC to return the atmospheric gases to the norma ?

TEP presentation caption (The Environmental Project) Re: Why should Washington’s DC, or any country government point of location think of as nowadays of as to being 'tomorrow as to come! if it...

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How to load and plot 2D-PIV (particle image velocimetry) recorded velocity vector field in Techplot?

Dear Researchers I need to know, how to load and plot 2D-PIV (particle image velocimetry) recorded velocity vector field data in Tecplot? Thank You

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Does the delta function actually make sense to use on point particles?

The delta function seems produce logical contradictions when analyzed on a fundamental level. I would be curious if anyone else agrees.

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Juan Lacruz

The theory behind is well explained in Francis Halzen, Quarks and Leptons 6.7 & 11.1

Because the charge of the charm quark is 2/3, this cross section is 4/3 times that for annihilation into a pair muon anti muon which in turn is 4/3 * pi * (alpha)^2 /s where s is 4 times the squared energy of the beams and alpha is the fine structure constant about 1/137.

Prasanth Krishnan

If possible, please give me the PDG value for this process.. What you have said Juan, is only about the e- m process.. But that annihilation can be happen via weak interaction too right..?? Then what will be the total cross section?