What are oblique parameters?

In context with electroweak precision tests, Peskin-Takeuchi or oblique or S,T,U parameters are quite familiar. I am looking for some references where these things are nicely explained (I have...

05 June 2018 4,061 0 View

What is 'bare mass' in context with particle physics?

05 June 2017 2,297 1 View

Why the sea quarks and gluons do not contribute to the vector current?

03 April 2017 3,218 11 View

Why Majorana fermions do not have vector currents?

Majorana fermions do not have vector interaction and hence there is no spin-independent direct search cross section for majorana like WIMPs. Can anyone please show me the proof ?

03 April 2017 5,435 3 View

What is the expression for Dark Matter (DM)-nucleon direct detection cross section?

For a Vector Boson DM, I have the following spin-independent direct detection (scattering) cross-section with nucleus (please see the attahced file), where n_n and n_p are the number of nucleons...

02 March 2017 3,944 4 View

How to calculate the annihilation cross section given a dark matter (DM) effective operator?

02 March 2017 3,138 4 View

What is H_T cut in connection with collider physics?

In collider physics I have frequently come across H_T cut over jet momenta. How do we define this quantity and what is the physical reason for applying this apart from missing energy cut?

01 February 2017 8,596 3 View

In 2 Higgs doublet model, how the gauge bosons get mass?

31 December 2016 981 8 View

What is the vertex factor for vector boson-scalar-scalar interaction?

I have a Feynman graph in t-channel with vector (X)-scalar(\phi)-scalar(\phi) vertex. Can someone please help me to find out what is the vertex factor for such a process and how can I calculate...

31 December 2016 7,536 4 View

Why the anti-commutation of gamma matrices give a flat metric?

We know that ${\gamma_{mu},\gamma_{nu}}$= 2 $g_{\mu\nu}$, where $g_{\mu\nu}$ is the flat metric . That shows spinors are someway related to the metric of space. Can anyone please explain how?

08 September 2016 9,765 3 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

What are the most relevant MSc proposal topics for Petroleum Production Engineering at the moment?

I am a Petroleum Production Engg MSc student at Robert Gordon University in Aberdeen and I am in the process of selecting a topic for my MSc Engineering Investigation proposal. I would very much...

01 March 2021 7,396 4 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View

How to model Supercritical water gasification (SCWG) process in Homer software?

Hi everyone How to model Supercritical water gasification (SCWG) process in Homer software?

25 February 2021 4,075 1 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View

How we can measure Kemp % in wool without using of benzene?

Would you please let me to know about the methods for measurement of medullation and Kemp % on animal? My problem is that the wool sampling and sending to laboratory is not possible. So I would...

21 February 2021 7,260 4 View