Hadron PID recalibration in EMCAL (Au-Au @200 GeV dataset) Dipali Pal and Debsankar Mukhopadhyay 05/10/2005

Outline Run4 200 GeV Au-Au stripe –2 dataset PbSc east and west Timing calibration was done by SUNY Phys. PID functions: isPi, isK and isP -- Fit mass-squared distributions at different momentum slices within 0.2 < p(GeV/c) < 2.2. -- Determine centroids and s’s of m2 distribution for pi, K and p at different momenta. -- Study and parametrize s vs p and centroid vs p. -- PID function: isN = [m2(measured) – m2(parametrized)]/s N = pi, K, p

Analysis Events: Minimum-bias CNT files |bbcz| < 30 cm Tracks: 3s matching at PbSc Used Sarah’s EmcTof timing recalibrator via master recalibrator module under fun4all.

Studying PbSc PID ranges from m2 distributions (Negative tracks) -- 1

Studying PbSc PID ranges from m2 distributions (Negative tracks) -- 2 Summary: PID starts from p = 0.3 Gev/c Protons are visible from p = 0.5 GeV/c All p, K, p are separated within 0.5 – 1.0 GeV/c p and K are separated within 0.3 < p (GeV/c) < 1.0 Both p and p are visible upto p = 2.0 GeV/c

Studying PbSc PID ranges from m2 distributions (Positive tracks) -- 1

Studying PbSc PID ranges from m2 distributions (Positive tracks) -- 2 Summary: PID starts from p = 0.3 Gev/c Protons are visible from p = 0.5 GeV/c All p, K, p are separated within 0.5 – 1.0 GeV/c p and K are separated within 0.3 < p (GeV/c) < 1.0 Both p and p are visible upto p = 2.0 GeV/c

m2 distributions and fitting – p(1) Fitting function: Gaussian (signal)+ second order polynimial(BG) Centroids and s’s within 0.4 < p(GeV/c) < 1.2 GeV/c

m2 distributions and fitting – p (2) p <m2> Dm2 s Ds 0.425 1.93412e-02 5.64171e-06 1.42876e-02 6.52406e-06 0.475 2.01024e-02 6.60745e-06 1.53048e-02 7.36232e-06 0.525 2.07095e-02 8.07960e-06 1.61947e-02 9.95618e-06 0.575 2.13641e-02 1.04908e-05 1.86279e-02 1.19702e-05 0.625 2.17791e-02 1.31154e-05 2.01832e-02 1.76499e-05 0.675 2.29392e-02 1.46679e-05 2.51717e-02 1.72781e-05 0.725 2.32765e-02 1.94704e-05 2.76286e-02 2.42279e-05 0.775 2.38180e-02 2.10156e-05 3.31087e-02 2.25764e-05 0.825 2.36832e-02 2.56740e-05 3.62322e-02 2.98424e-05 0.875 2.33362e-02 3.22193e-05 3.89872e-02 4.30654e-05 0.925 2.29862e-02 4.04230e-05 4.31029e-02 5.20999e-05 0.975 2.26063e-02 5.03514e-05 4.56432e-02 7.29674e-05 1.025 2.21324e-02 6.43552e-05 4.86645e-02 1.03817e-04 1.075 2.14308e-02 8.02492e-05 5.39479e-02 1.18684e-04 1.125 2.12625e-02 1.06780e-04 5.67767e-02 1.61946e-04 1.175 2.10636e-02 1.33646e-04 5.97685e-02 2.34772e-04

m2 distributions and fitting – p (3) p <m2> Dm2 s Ds 0.425 2.04804e-02 5.78918e-06 1.43018e-02 6.81281e-06 0.475 2.14776e-02 6.77480e-06 1.47563e-02 8.29970e-06 0.525 2.22586e-02 8.38990e-06 1.67164e-02 9.37491e-06 0.575 2.29220e-02 1.05703e-05 1.84447e-02 1.21553e-05 0.625 2.33958e-02 1.31049e-05 1.98841e-02 1.75037e-05 0.675 2.47990e-02 1.40753e-05 2.52235e-02 1.68293e-05 0.725 2.52223e-02 1.84220e-05 2.77299e-02 2.24928e-05 0.775 2.59898e-02 2.12238e-05 3.28194e-02 2.34276e-05 0.825 2.60214e-02 2.55728e-05 3.58844e-02 2.97514e-05 0.875 2.59500e-02 3.18085e-05 3.87719e-02 4.04857e-05 0.925 2.58609e-02 3.91492e-05 4.27760e-02 4.87962e-05 0.975 2.59118e-02 4.94901e-05 4.58972e-02 6.79248e-05 1.025 2.57458e-02 6.26377e-05 4.88063e-02 9.46749e-05 1.075 2.53075e-02 8.07918e-05 5.42803e-02 1.08603e-04 1.125 2.55001e-02 1.00740e-04 5.73623e-02 1.50763e-04 1.175 2.53188e-02 1.29133e-04 6.06947e-02 2.14393e-04

m2 distributions and fitting – Kaon Fitting function: Gaussian (signal)+ Exponential (BG) Centroids and s’s within 0.4 < p(GeV/c) < 1.0 GeV/c

m2 distributions and fitting parameters: K+ p <m2> Dm2 s Ds 0.425 2.42185e-01 1.54022e-04 1.56553e-02 1.75595e-04 0.475 2.41220e-01 1.23618e-04 1.67816e-02 1.52291e-04 0.525 2.41406e-01 1.18921e-04 1.88056e-02 1.48399e-04 0.575 2.39767e-01 1.23953e-04 2.02986e-02 1.59360e-04 0.625 2.37315e-01 1.31139e-04 2.27624e-02 1.66675e-04 0.675 2.32722e-01 1.37072e-04 2.51006e-02 1.89110e-04 0.725 2.31749e-01 1.42129e-04 2.54891e-02 1.96155e-04 0.775 2.32595e-01 1.79950e-04 2.59691e-02 2.41474e-04 0.825 2.34370e-01 1.98838e-04 2.88962e-02 2.84968e-04 0.875 2.36403e-01 2.49191e-04 3.06145e-02 3.76220e-04 0.925 2.40170e-01 2.78700e-04 3.22710e-02 3.17807e-04 0.975 2.42863e-01 3.26675e-04 3.31647e-02 3.94016e-04

m2 distributions and fitting parameters: K- p <m2> Dm2 s Ds 0.425 2.32098e-01 8.44555e-05 1.48567e-02 1.05598e-04 0.475 2.32757e-01 7.73167e-05 1.58106e-02 9.93645e-05 0.525 2.33198e-01 8.26665e-05 1.77687e-02 1.11171e-04 0.575 2.32182e-01 8.67459e-05 2.03107e-02 1.15419e-04 0.625 2.30504e-01 9.51658e-05 2.35753e-02 1.16232e-04 0.675 2.28955e-01 1.14824e-04 2.54182e-02 1.50929e-04 0.725 2.30701e-01 1.27559e-04 2.67122e-02 1.77200e-04 0.775 2.31804e-01 1.47042e-04 2.82275e-02 1.74135e-04 0.825 2.33882e-01 1.79177e-04 3.01557e-02 2.33549e-04 0.875 2.35673e-01 2.30715e-04 3.15570e-02 2.88545e-04 0.925 2.37563e-01 3.21945e-04 3.21888e-02 4.02436e-04 0.975 2.40550e-01 3.97911e-04 3.15957e-02 4.55462e-04

m2 distributions and fitting – protons Fitting function: Gaussian (signal)+ Exponential (BG) Centroids and s’s within 0.5 < p(GeV/c) < 2 GeV/c p-bar looks different from p at higher momenta.

m2 distributions and fitting parameters anti-proton proton p <m2> Dm2 s Ds p <m2> Dm2 s Ds 0.525 8.38922e-01 2.30569e-04 7.35306e-02 3.06760e-04 0.575 8.35126e-01 1.56946e-04 6.22146e-02 2.07657e-04 0.625 8.34169e-01 1.33862e-04 5.99364e-02 1.49992e-04 0.675 8.34047e-01 1.21984e-04 5.84328e-02 1.31943e-04 0.725 8.35924e-01 1.14449e-04 6.02623e-02 1.20031e-04 0.775 8.36475e-01 1.13179e-04 6.17481e-02 1.14258e-04 0.825 8.36537e-01 1.16899e-04 6.31630e-02 1.28115e-04 0.875 8.35708e-01 1.28854e-04 6.75981e-02 1.44277e-04 0.925 8.30799e-01 1.38254e-04 7.17074e-02 1.67568e-04 0.975 8.24962e-01 1.60733e-04 7.84306e-02 1.67365e-04 1.025 8.24088e-01 1.70998e-04 8.11583e-02 1.78789e-04 1.075 8.28533e-01 1.74763e-04 8.64369e-02 1.84366e-04 1.125 8.31889e-01 1.94046e-04 8.69121e-02 2.02682e-04 1.175 8.33777e-01 2.14766e-04 9.01551e-02 2.27216e-04 1.225 8.33470e-01 2.53430e-04 9.69106e-02 2.79408e-04 1.275 8.35085e-01 2.88645e-04 1.01061e-01 3.35895e-04 1.325 8.36669e-01 3.17737e-04 1.05790e-01 3.87167e-04 1.375 8.37537e-01 3.84266e-04 1.09239e-01 4.63914e-04 1.425 8.39780e-01 4.21090e-04 1.13487e-01 5.36348e-04 1.475 8.39545e-01 4.87584e-04 1.17894e-01 6.43010e-04 1.525 8.39547e-01 5.68870e-04 1.21568e-01 7.86942e-04 1.575 8.39180e-01 6.73928e-04 1.26053e-01 9.39349e-04 1.625 8.43624e-01 7.76245e-04 1.29032e-01 1.10263e-03 1.675 8.53585e-01 7.45019e-04 1.34714e-01 8.35646e-04 1.725 8.56081e-01 8.73782e-04 1.39854e-01 1.00584e-03 1.775 8.58270e-01 1.01741e-03 1.42082e-01 1.19132e-03 1.825 8.62252e-01 1.18193e-03 1.53582e-01 1.72819e-03 1.875 8.64294e-01 1.33219e-03 1.57569e-01 1.50343e-03 1.925 8.67229e-01 1.51363e-03 1.53183e-01 1.73929e-03 1.975 8.68832e-01 1.84625e-03 1.58906e-01 2.15543e-03 0.525 8.24160e-01 1.94306e-04 5.55213e-02 2.25734e-04 0.575 8.14489e-01 1.63168e-04 5.41344e-02 1.81215e-04 0.625 8.08997e-01 1.45644e-04 5.63844e-02 1.50311e-04 0.675 8.05267e-01 1.41902e-04 5.90197e-02 1.45252e-04 0.725 8.02198e-01 1.40851e-04 6.25576e-02 1.40489e-04 0.775 7.95211e-01 1.46433e-04 7.49469e-02 1.55313e-04 0.825 7.93549e-01 1.83313e-04 6.92718e-02 2.10971e-04 0.875 7.85877e-01 1.80779e-04 7.42368e-02 1.95503e-04 0.925 7.78149e-01 2.03091e-04 7.98894e-02 2.25851e-04 0.975 7.72667e-01 2.23434e-04 8.44332e-02 2.56120e-04 1.025 7.74221e-01 2.32922e-04 8.72917e-02 2.52338e-04 1.075 7.75344e-01 2.57958e-04 9.31361e-02 2.70267e-04 1.125 7.74236e-01 2.92302e-04 9.80132e-02 3.12187e-04 1.175 7.72713e-01 3.37465e-04 1.02521e-01 3.64329e-04 1.225 7.71495e-01 3.93354e-04 1.07809e-01 4.43039e-04 1.275 7.71864e-01 4.41316e-04 1.14150e-01 9.85193e-04 1.325 7.70304e-01 5.24774e-04 1.14469e-01 5.81857e-04 1.375 7.72307e-01 5.92422e-04 1.15852e-01 6.40897e-04 1.425 7.73269e-01 7.13488e-04 1.19993e-01 7.80172e-04 1.475 7.76052e-01 8.20439e-04 1.18553e-01 9.00092e-04 1.525 7.76031e-01 1.02723e-03 1.23299e-01 1.16229e-03 1.575 7.74263e-01 1.28945e-03 1.29347e-01 1.49271e-03 1.625 7.82285e-01 1.43131e-03 1.27335e-01 1.62069e-03 1.675 7.75476e-01 1.91076e-03 1.35118e-01 2.26960e-03 1.725 7.86470e-01 2.43676e-03 1.37579e-01 3.41647e-03

m2 Centroids vs momenta Centroids are fitted with 3rd order polynimial as functions of p: p0 + p1*x + p2*x2 + p3*x3 p0 p1 p2 p3 p+ p- K+ K- P P-bar 2.29043e-02 -3.91075e-02 9.79027e-02 -5.97900e-02 1.81909e-02 -1.21184e-02 5.77247e-02 -3.82399e-02 1.45776e-01 5.37155e-01 -9.50063e-01 5.17235e-01 1.76902e-01 3.04517e-01 -5.37774e-01 3.03167e-01 8.13481e-01 1.02371e-01 -1.41322e-01 5.66948e-02 9.01126e-01 -1.63571e-01 1.31146e-02 2.67600e-02

Sigma vs momentum: pion Fitting function: p0 + p1/x + p2/x2 + p3.x2 p0 p1 p2 p3 p+ 0.048499 -0.0401503 0.00990828 0.030773 p- 0.0541103 -0.0445806 0.0108446 0.0282518

Sigma vs momentum: kaon Fitting function: p0 + p1/x + p2/x2 + p3.x2 p0 p1 p2 p3 K+ 0.0525039 -0.0278102 0.00499849 0.00406312 K- 0.135903 -0.0935004 0.0188272 -0.0295423

Sigma vs momentum: proton P-bar Fitting function: p0 + p1/x + p2/x2 + p3.x2 p0 p1 p2 p3 p 0.206892 -0.210955 0.0729115 0.0092632 p-bar 0.18808 -0.150232 0.041425 0.00795054

Identified particles

Summary PID calibration functions are completed for run4 200 GeV dataset. Need to put them in recalibrator and database.