Investigating <i>K</i>/<i>π</i> Decay Muon Yields Using <i>K</i>/<i>π</i> Yields and a Fast Simulation Method
In ultra-relativistic heavy-ion collisions, the study of muons from kaon (<i>K</i>) and pion (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>π</mi></semantics></math></inlin...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Particles |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2571-712X/8/2/59 |
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| Summary: | In ultra-relativistic heavy-ion collisions, the study of muons from kaon (<i>K</i>) and pion (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>π</mi></semantics></math></inline-formula>) decays provides insights into hadron production and propagation in the Quark–Gluon Plasma (QGP). This paper investigates muon yields from <i>K</i> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>π</mi></semantics></math></inline-formula> decays in Pb–Pb collisions at <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msqrt><msub><mi>s</mi><mi>NN</mi></msub></msqrt><mo>=</mo><mn>2.76</mn></mrow></semantics></math></inline-formula> TeV using a fast simulation method. We employ a fast Monte Carlo procedure to estimate muon yields from charged kaons and pions. The simulation involves generating pions and kaons with uniform <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></semantics></math></inline-formula> and <i>y</i> distributions, simulating their decay kinematics via PYTHIA, and reweighting to match the physical spectra. Our results show the transverse momentum distributions of muons from <i>K</i> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>π</mi></semantics></math></inline-formula> decays at forward rapidity (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2.5</mn><mo><</mo><mi>y</mi><mo><</mo><mn>4.0</mn></mrow></semantics></math></inline-formula>) for different centrality classes. The systematic uncertainties are primarily from the mid-rapidity charged <i>K</i>/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>π</mi></semantics></math></inline-formula> spectra and rapidity-dependent <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>AA</mi></msub></semantics></math></inline-formula> uncertainties. The muon yields from pion and kaon decays exhibit consistency across centrality classes in the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></semantics></math></inline-formula> range of 3–10 GeV/<i>c</i>. This study contributes to understanding hadronic interactions and decay kinematics in heavy-ion collisions, offering references for investigating pion and kaon decay channels and hot medium effects. |
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| ISSN: | 2571-712X |