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Questions tagged [hadronization]

21 questions
13
votes
1 answer

Probability of forming mesons vs baryons

When a heavy quark hadronizes it has some probability of forming a meson vs forming a baryon. I suspect there is a well known branching ratio for each type of hadron. Does anyone know what the probability is or, even better, a reference that…
JeffDror
  • 9,093
9
votes
1 answer

Very short decay: A bare quark?

I keep reading the same phrase about the very short life time of the top quark: Because the t-quark decays on a shorter than the characteristic QCD interaction-time it cannot hadronize. Therefore it give to possibility to be seen as a bare…
Anne O'Nyme
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8
votes
1 answer

"Unaccounted for" vertices in certain Feynman diagrams?

I'm looking to understand where certain "unexplained" vertices in some Feynman diagrams come from, in a physical sense. For example, in the top figure (Aaij et al. 2015), in diagram (b), there is an "unaccounted for" $u\bar{u}$ pair that seems to…
user86859
  • 83
7
votes
1 answer

Reference on stages of heavy ion collisions in particle physics

Is there any reference (book/review article etc.) where the physics of heavy ion collisions is overviewed? To be absolutely clear about things, I am looking for a introductory review which covers the physics aspects of the progression through the…
User Anonymous
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5
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2 answers

Why is tauon not being probed for high accuracy $g-2$ values?

The recent results from LHCb (regarding violation of lepton universality in $B$ meson deacy) and Fermilab (regarding anomalous muon $g-2$ factor) have set the HEP$^1$ community abuzz right now$^0$. In both cases, it seems that the muon isn't just a…
lineage
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5
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2 answers

fate of a hadron in a big rip

As I understand it, if you try to "pull apart" a hadron with sufficient force, you just make more hadrons. Would the same thing happen in a Big Rip? (this answer suggests it would, as long as the expansion is sufficiently violent) Suppose you start…
Hugh Allen
  • 1,635
3
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0 answers

When do pairs of quarks form jets vs mesons?

For certain processes with low momentum transfer, such as the Kaon decay shown below, quarks will form bound states of mesons. Whereas for higher momentum-transfer processes, such as the decay of an on-shell heavy particle to a quark-anti-quark…
Jackson Burzynski
  • 857
3
votes
2 answers

$e^+e^-\to q\bar{q}$: Reconstructing $q\bar{q}$ energy and momentum

Question In a real collider experiment e.g. LHC / LEP how can one reconstruct the energy and momentum of the resultant $q\bar{q}$ pair produced from the process $e^+e^-\to q\bar{q}$? Specifically, how can we relate the kinematic variables before…
Alexander McFarlane
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Implementation of fragmentation functions into a cross section calculation

I'm trying to understand how fragmentation is put into a cross section calculation. I have learned that the full cross section can look something like \begin{equation} \sigma=\int_0^1d\xi\int_0^1dzf(\xi)D(z)\hat{\sigma} \end{equation} (it can look…
Ville Alanko
  • 95
1
vote
1 answer

Hadronization time

In the process of hadronization what is the characteristic time? I was thinking about at the inverse of $\Lambda_{\rm QCD}$ but can also be a dependence from $\sqrt{s}$. Can anyone help me?
Tony Stack
  • 506
1
vote
0 answers

What are the correct QCD Feynman diagrams for jets or hadronization?

In many drawings for jets or hadronization there are outgoing individual quark or gluon lines from which hadrons seem to emerge. But this is wrong: a color-neutral hadron cannot emerge from a single quark or gluon line. See e.g. page 7 in The Strong…
TomS
  • 957
1
vote
2 answers

Is it entirely impossible for the top quark to hadronize?

I know that under normal circumstances the top quark does not have the time to hadronize. Under what conditions would it be possible to hadronize? Obviously adding more energy to the top (if that was possible) is not the solution. Is it possible to…
Rick
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0
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1 answer

Isospin and Energy

I would to know if there is a correlation between isospin and energy. Consider for example the $\eta$ meson ($I =0$) and the pions($I=1$). The $\eta$ turns out to be much heavier then the pions ($m_\pi \approx 150 \mbox{MeV}$,$m_\eta\approx…
JeffDror
  • 9,093
0
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0 answers

Which hadrons were present after the phase transition from the post-Big Bang QGP?

This question relates to the "hadron epoch" (after the initial quark-gluon plasma, but before the end of baryogenesis). My understanding is that the phase transition that ends the quark-gluon plasma era happened when the ambient energy was around…
SgtJohn74
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Physical interpretation of hadron distribution amplitudes

A parton fragmentation function can be interpreted as the probability that a final state hadron originated from that particular hadron. A parton distribution function can be interpreted as the probability some parton with momentum $xP$ ($x \in (0,…
user3166083
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