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PREDICTIONS OF KAON AND PROTON PRODUCTIONS IN PP COLLISIONS AT 7 TeV

KRISTIYA TOMUANG

Department of Physics, Naresuan University

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.

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Exotic Nuclei -an exotic atom is an otherwise normal atom in which one or more sub-atomic particles have been replaced by other particles of the same charge.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)

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.

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)

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)

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