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Jun
23
comment Ideal energy to study higgsstrahlung at a lepton collider
Circular colliders have the advantage that one can install more than one experiment thus effectively multiplying the recorded luminosity and particles can collide more than once. Looking at Table 3 of arxiv:1308.6176, it is expected to have a total integrated luminosity of $10\ \mathrm{ab}^{-1}$ for four detectors at TLEP240 compared to $0.25\ \mathrm{ab}^{-1}$ at ILC250.
Jan
30
comment Switching a PMT from PC-mode to DC-mode: What happens?
what is the 'coupling' setting at the scope input ?
Jan
30
comment Switching a PMT from PC-mode to DC-mode: What happens?
sounds like something cuts off the DC component in your signal. Just a thought: does your PMT amplifier support DC mode ? (can you share which model it is ?)
Jan
29
comment Switching a PMT from PC-mode to DC-mode: What happens?
have you actually observed what happens when you increase the photon rate (be careful to stay within the limits of your PMT) ? If you have a high rate, pulses from individual photons will 'overlap' and look like a steady current (as illustrated e.g. here: vertilon.com/pmt_readout.html )
Jan
28
comment Are we living in a Universe with 3 time dimensions and 1 spatial dimension?
I guess it would be difficult to read your question if he had one spatial dimension only...
Dec
20
comment The status of the BICEP2 'discovery' after Planck 2014
see also resonaances.blogspot.com/2014/09/… and links therein
Dec
4
comment What would happen if you put your hand in front of the 7 TeV beam at LHC?
the reflex time of 0.1-0.2 seconds is much larger than the time it takes for the beam to do one turn (which is about $90 \mu s$), once protons interact with the hand, most of them will not make another turn (the beam blows up in the transverse direction), i.e. the reaction time is slow enough to absorb one beam entirely. $1.2 \cdot 10^{11}$ is more the number of protons per bunch, of which there are up to 2808 per beam (see here which would give $3.4 \cdot 10^{14}$ protons per beam.
Dec
4
comment What would happen if you put your hand in front of the 7 TeV beam at LHC?
The design number of bunches is 2808 per beam (see here and $1.15\cdot 10^{11}$ protons per bunch ($3.2 \cdot 10^{14}$ protons per beam), you'll get 362 MJ per beam (at 7 TeV beam energy)
Nov
28
comment What role did the Higgs boson play in the Big Bang?
see the Wikipedia article on the Inflaton, which is a general term for a scalar field which drives inflation. The Higgs field is a scalar field and could be the Inflaton (i.e. drive inflation).
Nov
7
comment Unitarity of PMNS matrix
if any row or column squared sums to something less than one (experimentally), this is an indication that we're missing something, e.g. a fourth row/column corresponding to an additional species of neutrinos.
Nov
6
comment Software for calculating Feynman Diagrams
MadGraph does only tree level (no loops but many outgoing particles), MadGraph5_aMC@NLO can do one loop
Nov
5
comment Kitchen floor dries faster with lights on?
although traditional incandescent light bulbs and fluorescent tube lights have an efficiency far below 50% (according to en.wikipedia.org/wiki/Fluorescent_lamp#Luminous_efficacy), so more energy is converted to heat than to light for these.
Nov
1
comment Kitchen floor dries faster with lights on?
yes, good point, and the water in turn would heat the region of air immediately above the water
Oct
10
comment How detectors in particle colliders can differentiate neutrons from antineutrons?
because anti-quarks in the anti-neutrons annihilate with the quarks in the protons and neutrons in the carbon nuclei while at such low energies, a neutron essentially behaves like an (unbreakable) ball
Sep
29
comment How can I measure the speed of a figure skater's spin?
the stroboscope (or camera flash which has such a function) probably only works well if she can spin for a enough time while you adjust the stroboscope's frequency...
Sep
29
comment why are two higgs doublets required in SUSY?
see also physics.stackexchange.com/questions/116598/…
Sep
26
comment Why more than one Higgs?
Is there a typo here we don't want the theory to be renormalisable ?
Sep
7
comment Is the photoelectric effect a type of nuclear decay?
good point, so 'photonuclear reaction' is probably more adequate.
Sep
6
comment Is the photoelectric effect a type of nuclear decay?
The article on induced gamma emission I linked starts with the sentence: "In physics, induced gamma emission (IGE) refers to the process of fluorescent emission of gamma rays from excited nuclei". That's what the original poster was looking for as an analogy to the photoelectric effect, isn't it ?
Aug
20
comment How does one experimentally determine chirality, helicity, spin and angular momentum of a fundamental particle?
actually, the original poster asked for fundamental particles which usually means that they are not composite.