predictions of kaon and proton productions in pp collisions at 7 tev kristiya tomuang department of...
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PREDICTIONS OF KAON AND PROTON PRODUCTIONS IN PP COLLISIONS AT 7 TeV
KRISTIYA TOMUANG
Department of Physics, Naresuan University
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Topics
Introduction Model and Calculation Research Methods Result & Conclusion
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Introduction
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Exotic nuclei is using as a key topics in nuclear and astronomy physics to understand the structure of matter, interaction and fundamental force including evolution of the universe.
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Introduction
Exotic Nuclei
Exotic Nuclei -an exotic atom is an otherwise normal atom in which one or more sub-atomic particles have been replaced by other particles of the same charge.
Muon Pion Kaon
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Introduction
Kaonic Nuclei
Kaonic Nuclei-an exotic atom consisting of negative charge of kaon orbiting two proton.
kaonic nuclei molecule, results from a fusion of and p, namely, as a boundstate of
Λ∗
Λ∗
𝐾 −𝑝
5Toshimitsu Yamazaki and Yoshinori AkaishiPhys. Rev. C 76, 045201 (2007)
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Model and Calculation
PACIAE models has been developed from the PYTHIA model. PACIAE is a model not only for elementary collisions, but also for nucleus-nucleus collisions.
The PACIAE model consists of four stages
parton initialization parton evolution (rescattering) Hadronization Hadron evolution (rescattering)
PACIAE models
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Model and Calculation
Parton initialization
Nucleus-nucleus collision is decomposed into nucleon-nucleon (NN) collisions. The string fragmentation is switched-off and diquarks (anti-diquarks) are broken into quarks
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Model and Calculation
Parton evolution (rescattering)
Parton evolution or called “parton rescattering” is the proceeded from parton initialization until partonic freez-out.
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Model and Calculation
Hadronization
Hadronization is the process after parton rescattering. the string fragmentation was built up.
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Model and Calculation
Hadron evolution (rescattering)
Hadron evolution is proceeded until hadronic freez-out such as 𝐾 ,𝑝 ,𝜋 ,𝑛 , Λ ,Σ , 𝐽 /Ψ
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Model and Calculation
DCPC model is the model that used to construct the cluster of particles and calculate the yield of light nuclei (anti-nuclei) after the transport model simulations.
Dynamically constrained phase space coalescence model(DCPC model)
uncertainty principle ∆ �� Δ �� ≥h3
q is the position and p is the momentum of particle
(1)
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Model and Calculation
We can estimate the yield of single particle by definition as following intregal
EH h
pdqdY
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The yields of N cluster can be estimated as
EH NNN
N h
pdqdpdqdY
311 ...
...
(2)
(3)
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Model and Calculation
Similarly for the yield of can estimated by
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332211123...
h
pdqdpdqdpdqdYKpp
0
1
123
otherwusr
DqDqDq
mmmm
ppKif
inv
,,,
3,2,1
023013012
00
Where
2/12321
2321 pppEEEminv
is the rest mass of kaonic nuclei. refer to the allowed uncertainty. is the limiting the spatial position.
𝑚0
𝐷0
m
Invariant mass
(4)
(5)
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Research Methods
Measure the charge particles , and yields and simulate the productions at scaled mid-rapidity < 0.5 from the simulation of proton and proton collisions at 7 TeV by using PACIAE+DCPC model
Analyze the result from PACIAE+DCPC model and compare the result with ALICE data.
𝐾 ±𝑝 𝑝
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Result
yields ALICE data PACIAE model
K+ 0.286 0.289K- 0.286 0.285p 0124 0.182
0.123 0.172K-pp - 0.029K+ - 0.026
Proton -Proton collisions at 7 TeV |𝑦|≤0.5
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Conclusion
Measurement of charge particles , and yields at scaled mid-rapidity < 0.5 in pp collsions at 7 TeV the simulation can be reasonably described by ALICE
The predictions of kaonic nuclei and productions can be consistent with the yields of , and by The value of kaonic nuclei productions are under the maximum number of proton (anti-proton) and kaon (anti-kaon)
𝐾 ±𝑝 𝑝
𝐾 ±𝑝 𝑝
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THANK YOU