PHOS π 0 analysis, for production, R AA, and Flow analysis, LHC11h

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1 PHOS π, ask PHOS π analysis, for production, R AA, and Flow analysis, Henrik Qvigstad henrik.qvigstad@fys.uio.no University of Oslo --5

2 PHOS π, ask ask he task we use, AliaskPiFlow was written prior, for use LHCh (ESD), has been re-factored to be as general as possible. his means allowing both ESD/AOD, different periods, minimizing hard-coded parameters etc..., which will remain a work in progress as dependencies change. he main strategy for data access is to participate in the GA PbPb LEGO train. his allows task to be run on full set of data for every tag, twice a week.

3 PHOS π, ask We sample the π 99% γγ raw signal using γ induced clusters in PHOS. In PbPb the signal is seriously affect by combination noise, background scales with about M(M ). Efficiency of raw signal we plan to estimate by embedding single π in PbPb MC production, Dmitri. For R AA, production cross section must be estimated for.67ev using.9ev and 7eV measurements. For Flow, we use event plane estimate by V, and PC π + γ IP π γ

4 PHOS π, Raw Spectrum ask, PID=CPV,.<p <. GeV/c , PID=CPV,.<p <. GeV/c 6 5 4, PID=CPV,.<p <4. GeV/c , PID=CPV, 4.<p <5. GeV/c , PID=CPV, 5.<p <7. GeV/c , PID=CPV, 7.<p <. GeV/c Figure: Ratio of Signal and Event ing Background. Fitted with. and. degree pol. kcentral

5 PHOS π, ask Raw Spectrum 7 / / / 6, PID=CPV,.<p <. GeV/c A , PID=CPV,.<p <. GeV/c A.6.5, PID=CPV,.<p <4. GeV/c A.877. M γγ m.48. m.4. M. σ γγ m.49. σ σ a.76. a a.4... a.6. a -..6 a a.. a a / / / 6, PID=CPV, 4.<p <5. GeV/c A.7., PID=CPV, 5.<p <7. GeV/c A.446.9, PID=CPV, 7.<p <. GeV/c A M γγ m.44.4 m.94. M γγ m.9.4 σ σ σ a.7. a a a.8. a a a.7.4 a a Figure: Ratio of Signal and Event ing Background. Fitted with. and. degree pol. kcentral

6 PHOS π, Raw Spectrum, BG sub. ask 5 /, PID=CPV,.<p <. GeV/c A.699e+4.56e+ m.4. 8 σ.. B / 8, PID=CPV,.<p <. GeV/c A m.48. σ.9.9 B / 8, PID=CPV,.<p <4. GeV/c A m σ.65.8 B / 8, PID=CPV, 4.<p <5. GeV/c A m / 8, PID=CPV, 5.<p <7. GeV/c A m / 8 M γγ, PID=CPV, 7.<p <. GeV/c A 9.. m.9. 8 σ.95.4 B σ B σ B Figure: Signal after background subtraction. kcentral

7 PHOS π, riggers ask In analysis group, we have started to look at 4 kcentral ksemicentral kmb kphospb

8 PHOS π, Centrality ask Centrality distribution kcentral ksemicentral kmb kphospb Figure: Centrality for different trigger classes. Plot made by Yuri Kharlov.

9 PHOS π, Raw Spectrum ask, PID=CPV,.<p <. GeV/c , PID=CPV,.<p <. GeV/c , PID=CPV,.<p <4. GeV/c , PID=CPV, 4.<p <5. GeV/c , PID=CPV, 5.<p <7. GeV/c , PID=CPV, 7.<p <. GeV/c Figure: Ratio of Signal and Event ing Background. Fitted with. and. degree pol. kphospb

10 PHOS π, ask Raw Spectrum 5. / 8 9. / / 6, PID=CPV,.<p <. GeV/c A.45.59, PID=CPV,.<p <. GeV/c A.54.6, PID=CPV,.<p <4. GeV/c A m.99.5 m.78.5 M γγ m.7.5 σ σ σ a.65. a a a.9. a a.4.5. a.7. a a / 6.9 / / 6, PID=CPV, 4.<p <5. GeV/c A.545.5, PID=CPV, 5.<p <7. GeV/c A , PID=CPV, 7.<p <. GeV/c A.6.47 M γγ m.59.4 M m.59. γγ. M.5 γγ m.6. σ σ σ a.98. a a.5... a.546. a a.5. a.66.6 a a Figure: Ratio of Signal and Event ing Background. Fitted with. and. degree pol. kphospb

11 PHOS π, Raw Spectrum, BG sub. ask 7. /, PID=CPV,.<p <. GeV/c A m σ.9.6 B / 8, PID=CPV,.<p <. GeV/c A m σ B / 8, PID=CPV,.<p <4. GeV/c A m.74.5 σ B / 8, PID=CPV, 4.<p <5. GeV/c A m / 8, PID=CPV, 5.<p <7. GeV/c A m / 8 M γγ, PID=CPV, 7.<p <. GeV/c A m.6. σ B σ B σ B Figure: Signal after background subtraction. kphospb

12 PHOS π, Raw Spectrum, BG sub. ask, PID=CPV,.<p <. GeV/c, kcentral rawpisignal_ptbin Entries e+7 Mean RMS.48 M γγ, PID=CPV,.<p <. GeV/c, ksemicentral 5 5 rawpisignal_ptbin Entries 8786 Mean.87 RMS , PID=CPV,.<p <. GeV/c, kmb 5 rawpisignal_ptbin Entries 6774 Mean.69 RMS.745, PID=CPV,.<p <. GeV/c, kphospb 45 4 rawpisignal_ptbin Entries 9476 Mean.4 RMS Figure: Signal after background subtraction. kphospb

13 PHOS π, Raw Spectrum, BG sub. ask, PID=CPV, 5.<p <7. GeV/c, kcentral rawpisignal_ptbin5 Entries 978 Mean.9 RMS.784 M γγ, PID=CPV, 5.<p <7. GeV/c, ksemicentral rawpisignal_ptbin5 Entries 774 Mean.64 RMS , PID=CPV, 5.<p <7. GeV/c, kmb 6 rawpisignal_ptbin5 Entries Mean.68 RMS.895, PID=CPV, 5.<p <7. GeV/c, kphospb rawpisignal_ptbin5 Entries 6 Mean.6 RMS Figure: Signal after background subtraction. kphospb

14 PHOS π, Raw Spectrum, BG sub. ask, PID=CPV,.<p <. GeV/c, kcentral hpi_ptbin Entries.9686e+9 Mean.456 RMS.7794, PID=CPV,.<p <. GeV/c, ksemicentral hpi_ptbin Entries 4.75e+8 Mean.448 RMS , PID=CPV,.<p <. GeV/c, kmb 5 hpi_ptbin Entries 9.5e+7 Mean.45 RMS.7797, PID=CPV,.<p <. GeV/c, kphospb hpi_ptbin Entries e+7 Mean.454 RMS Figure: Signal after background subtraction. kphospb

15 PHOS π, ask Fin

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