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General Information :- 
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• Paper Title : Multiplicity and Rapidity Dependence of (Multi-)strange hadron production in d+Au collisions at $\sqrt{\s_{NN}}$ = 200 GeV using the STAR detector 
• PAs : Ishu Aggarwal, Lokesh Kumar 

                   Panjab University, Chandigarh 

• Target Journal : Journal of High Energy Physics (JHEP)

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Abstract : 
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We present first measurement of (multi-)strange hadrons ($K_{s^{0}}, $\Lambda$, $\bar\Lambda$, $\Xi^{-}$, $\bar\Xi^{+}$, $\Omega^{-}$ and    $\bar\Omega^{+}$) in d+Au collisions at $\sqrt{\s_{NN}}$ = 200 GeV, collected by STAR in 2016. The multiplicity and rapidity dependence of (multi-)strange hadron transverse momentum ($p_{T}$) spectra, $p_{T}$-integrated yields (dN/dy), average transverse momentum ($\langle p_{T} \rangle $), baryon to meson ratio, and yield ratios to pions is presented. A strangeness enhancement for these particles as compared to pp collisions is observed. Multiplicity dependence of these results along with pp, Cu+Cu and Au+Au collision systems at same energy suggest that the (multi-)strange hadron production follows a smooth trend and is independent of collision systems. The nuclear modification factor ($R_{dAu}$) and rapidity asymmetry ($Y_{Asym}$) as a function of transverse momentum is studied to look for the nuclear effects. The results are also compared with PYTHIA8/Angantyr and Heavy Ion Jet Interaction Generator (HIJING) models to understand the collision dynamics.

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Proposed Figures :-
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Figure 1 :
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Caption : Transverse momentum spectra for $K^0_s$, $\Lambda(\bar\Lambda)$, $\Xi^{-}(\bar\Xi^{+})$ and $\Omega^{-}(\bar\Omega^{+})$ at mid rapidity (|y| < 0.5) in d+Au collisions at $\sqrt{ \s_{NN}}$ = 200 GeV for two multiplicity classes (0-20% and 20-50%). Curves represent exponential fit function for  $K^0_s$ and $\Lambda(\bar\Lambda)$, Boltzmann fit function for $\Xi^{-}(\bar\Xi^{+})$ and levy function for $\Omega^{-}(\bar\Omega^{+})$. The statistical and systematical uncertainties are shown as bars and boxes around the data points, respectively.  
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 Figure 2 :
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 Caption :  Integrated yield and mean transverse momentum as function of multiplicity for  $\pi^{-}(\pi^{+})$, $K^{-}(K^{+})$, $p(\bar{p})$, $K^0_s$, $\Lambda(\bar\Lambda)$, $\Xi^{-}(\bar\Xi^{+})$ and $\Omega$ at mid rapidity  in p+p, d+Au, Cu+Cu and Au+Au collisions at  $\sqrt{ \s_{NN}}$ = 200 GeV. The error bars shown  are statistical and systematical uncertainties added in quadrature. Filled and open symbols are used for particle and anti particles respectively. 

   

Caption : The enhancement factor for (multi-) strange particles $K^0_s$, $\Lambda(\bar\Lambda)$, $\Xi^{-}(\bar\Xi^{+})$ and $\Omega$ in d+Au, Cu+Cu and Au+Au collisions at $\sqrt{ \s_{NN}}$   = 200 GeV at mid-rapidity. The green bars show the normalisation uncertainties. Statistical and systematic uncertainties are shown by bars and square brackets respectively.   


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Figure 5 :
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  Caption :  $\Lambda / K^0_s$ as function of $p_{T}$ at mid rapidity (|y| < 0.5) for p+p, d+Au, Cu+Cu and Au+Au collisions at  $\sqrt{ \s_{NN}}$ = 200 GeV. Bars and Square brackets are statistical and systematical errors respectively.

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Figure 6 :
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  Caption : Nuclear modification factor (R_dAu) for  $\pi^{-} + \pi^{+}$, $K^{-} + K^{+}$, $p + \bar{p}$, $K^0_s$, $\Lambda + \bar\Lambda$ and $\Xi^{-} + \bar\Xi^{+}$ at mid rapidity (|y| < 0.5) for 0-20% central d+Au collisions at  $\sqrt{ \s_{NN}}$ = 200 GeV. The grey band corresponds to error due to uncertainties in estimating the number of binary collisions in 0-20% central d+Au collisions. Λ data points are p_T shifted by 0.1 GeV/c for clarity. Bars and square brackets are statistical and systematical errors respectively.

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Figure 7 :
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   Caption :  Transverse momentum spectra for $K^0_s$, $\Lambda(\bar\Lambda)$ and $\Xi^{-}(\bar\Xi^{+})$  for 0-20% multiplicity class in d+Au collisions at  $\sqrt{ \s_{NN}}$ = 200 GeV for rapidity regions (0 < |y| < 0.4 and 0.4 < |y| < 0.8). Curves represent exponential fit function for $K^0_s$ and $\Lambda(\bar\Lambda)$, Boltzmann fit function for  $\Xi^{-}(\bar\Xi^{+})$. The statistical and systematical uncertainties are shown as bars and boxes around the data points, respectively.  

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Figure 8 :
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   Caption :  The p_T-integrated  yield (dN/dy) for  $K^0_s$, $\Lambda(\bar\Lambda)$ and $\Xi^{-}(\bar\Xi^{+})$ as a function of rapidity for 0-20% and 20-50% multiplicity classes in d+Au collisions at $\sqrt{ \s_{NN}}$ = 200 GeV. The statistical and systematical uncertainties are shown as bars and boxes around the data points, respectively. 

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Figure 9 : 
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    Caption :  The mean transverse momentum ($\langle p_{T} \rangle$) for  $K^0_s$, $\Lambda(\bar\Lambda)$ and $\Xi^{-}(\bar\Xi^{+})$ as a function of rapidity for 0-20% and 20-50% multiplicity classes in d+Au collisions at $\sqrt{ \s_{NN}}$ = 200 GeV. The statistical and systematical uncertainties are shown as bars and boxes around the data points, respectively.

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Figure 10:
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