Quick jet study updates Jin Huang BNL bjet
Quick jet study updates Jin Huang (BNL)
b-jet studies � � � Differentiative analyzing power to collisional and radiative energy loss of high energy parton in QGP Probing kinematics and production channels of bquark b-jet tagging simulated in full Geant 4 Further correlation analysis to go beyond simple RAA: di-b-jet, b-jet-HF-meson Analysis note (half-way in revision, need to complete): https: //www. phenix. bnl. gov/phenix/WWW/publish/jinhuang/s. PHENIX/s. PH-HF-2017 -001 -v 1. 1. pdf b-jet tagging (Haiwang, Sanghoon) Inclusive b-jet RAA Di-b-jet correlation (Darren) Jin Huang <jhuang@bnl. gov> b-jet-D-meson correlation (Xuan) HF TG Meeting 2
Event plane correlation with b-jet � From the MVTX Director’s review, we were also recommended to make projection for b-jet v 2 � In mid-central events, probing path-length dependent energy loss for b-quark � In connection to B-meson and light flavor jet v 2 s. PH-HF-2017 -002 -v 1 ar. Xiv: 1501. 06197 [nucl-ex] Jin Huang <jhuang@bnl. gov> HF TG Meeting 3
Current jet v 2 data � LHC data: ◦ ALICE: Charge-jet, 30<p. T<100 Ge. V ◦ ATLAS: calorimetry jet , 50<p. T<150 Ge. V � Few – 10% v 2 in mid-central events � Challenges: subtraction of event plane-dependent background 10. 1016/j. physletb. 2015. 12. 047 Jin Huang <jhuang@bnl. gov> HF TG Meeting 4
b-jet v 2 projection � � Based on the same simulation setup as RAA simulation (PYTHIA 8 + CTEQ 6 L) Two event plane resolution assumptions: ◦ Res = 0. 4: Event plane detector covering 3<|eta|<4, citing the PHENIX BBC event plane resolution (20 -30%C) ◦ Res = 0. 7: TPC event plane |eta|<1, citing STAR TPC event plane resolution (0 -80%C) � Plot macro in Git. Hub: https: //github. com/s. PHENIX-Collaboration/analysis/blob/master/HFJet/Truth. Generation/macros/Draw_HFJet. Truth. C Event plane detector covering 3<|eta|<4 TPC event plane |eta|<1 Jin Huang <jhuang@bnl. gov> HF TG Meeting 5
Jet simulation path forward � Completing addressing comments of 1 st analysis note: https: //docs. google. com/document/d/1 a. C-Dgu 4 h. T 0 OWtn. Ow. Qa 1 n 0 px-_n. I 83 twq. WZDqxsui 68 U/edit? usp=sharing � Recommendation from director’s review ◦ Theory curves: contacting multiple theory groups to ensemble uncertainty bands of current models. Quoting uncertainty in Ivan’s calculation ◦ Presenting plots: apply same style to b-jet B-meson plots � Highlights from our TODO list on wiki: https: //wiki. bnl. gov/s. PHENIX/index. php/Heavy_Flavor_Topical_Group#Study_plans ◦ Update b-jet tagging simulation with laddered detector model and + calorimetry – Haiwang, Sanghoon ◦ Fast simulation to allow large fake jet simulation – Help needed ◦ di-b-jet purity/efficiency in Geant 4 – Darren, Haiwang ◦ Completing purity estimation for the B-meson-b-jet correlation – Xuan ◦ New topics: e. g. charmed jets Jin Huang <jhuang@bnl. gov> HF TG Meeting 6
Extra Information Jin Huang <jhuang@bnl. gov> HF TG Meeting 7
PHENIX Event plane resolution PHENIX/Analysis Note 1092 Jin Huang <jhuang@bnl. gov> HF TG Meeting 8
b-jet theory updates for s. PHENIX Cesar da Silva (LANL) working with Ivan Vitev’s group updating p. QCD calculation of [Phys. Lett. B 726 (2013) 251 -256 ] to s. PHENIX kinematics Phys. Lett. B 726 (2013) 251 -256 Phys. Rev. Lett. 113 (2014) no. 13, 132301 Jin Huang <jhuang@bnl. gov> HF TG Meeting 9
Strong connection to tracking dev. � � � Many appreciation of the hard work of tracking team [see Tony’s talk] Strong connection in analyzers and tracking developers Focus from HF topical group: ◦ Efficiency down to ~1 Ge. V/c - multi-track displaced vertex ◦ Low fake DCA tail - rare signal of HF decay ◦ DCA resolution - differentiate of HF decay Jin Huang <jhuang@bnl. gov> HF TG Meeting 10
Past activities: b-jet tagging – High DCA track counting � Short history ◦ Dennis and Haiwang implemented track counting tagger in the full Geant 4 simulation ◦ Haiwang produced projection plot in Geant 4 simulation. ◦ Systematically validating the Geant 4 -based track fit procedure, in order to optimize 3 -D DCA and likelihood ◦ Reevaluate in HI background with HIJING embedding � Next ◦ Use new tracking simulation and pattern recognition Fast sim in s. PHENIX Proposal Full Geant 4 Sim: p+p Embedded to Central Au. Au From Haiwang’s talk https: //indico. bnl. gov/conference. Display. py? conf. Id=1926 Jin Huang <jhuang@bnl. gov> HF TG Meeting 11
Summary 1: technical performances: � Realistic implementation in Geant 4 ◦ ◦ � Completed: implement ladder structure in simulation – Tony F. , Gaku M. Completed : digitization of MAPS detector - Tony F. On-going: Update tracking performance plots for MAPS, DCA and dp/p resolutiosn - Tony F. By summer (? ): complete the pile-up simulation framework – Mike M. , Yorito Y. b-jet tagging algorithm ◦ By summer, help needed : Investigating full-detector fast simulation for b-jet simulation. Look into general packages e. g. DELPHES. ◦ On-going, developing: It will be very useful to use new in-development pattern recognition software to bring back hit collection efficiency. ◦ By summer: Full calorimetry simulation with secondary vertexing tagger – Sanghoon L. ◦ By summer: Full calorimetry simulation with high-DCA track counting – Haiwang Y. Jin Huang <jhuang@bnl. gov> HF TG Meeting 12
Summary 2: Physics performances Differential sensitivity of energy loss mechanism and accessing QGP transportation properties � Update non-prompt D meson performance projection ◦ Completed : update the Rcp and v 2 plot with more realistic simulations for MB and peripheral collisions - Xin D. , Xiaolong C. � Explore complimentary B-hadron channels beyond non-prompt-D ◦ Completed : exclusive B->D pi - Xin D. , Xiaolong C. ◦ By summer, help needed: B->non-prompt J/Psi->e +/e- and p+p triggering � Inclusive b-jet RAA ◦ On-going, first results: Update theory curve to RHIC energy – Cesar da S. working with Vitev group ◦ Completed : Update RAA plot � di-b-jet asymmetry ◦ On-going: Extract di-jet purity from Geant 4 simulation - Haiwang Y. ◦ Deliverable : Apply di-jet purity to projection – Darren M. , Haiwang Y. � b-jet-non-prompt-D asymmetry: ◦ On-going: Produce uncertainty projection in fast simulation – Xuan L. Jin Huang <jhuang@bnl. gov> HF TG Meeting 13
Additional study wish list Help (always) wanted � � � HF-hadron chemistry: e. g. high stat. Λc, to study HQ hadronization HF-meson correlations, e. g. D-D_bar azimuthal correlations, to enhance sensitivity to HQ-medium interaction; enhance M/p. T ratio scale comparing to D-b-jet correlation. Explore b-jet substructure tools: ◦ Exercise jet-grooming algorithm, FF. – in collaboration with Jet Structure group ◦ Tagging gluon splitting via multi-decay vertex in inclusive b-jets. � Explore Charmed-quark jet: ◦ charm fragmentation, completes mass hierarchy. Select D meson formed late in formation ◦ Try out prompt-D tagger (ALI-PREL-117896) and Corrected Secondary vertex (ar. Xiv: 1612. 08972 ). ( Sanghoon/Xuan expressed interests ) � Explore tagged D-meson in correlation with opposite hard structure ◦ Tagging initial c-quark kinematics with correlations, including D-meson - jet correlation and D-meson - photon correlation ◦ Study D-FF and formation of D-meson � Further b-jet tagging developments ◦ Try different strategy: Soft-lepton tagging ◦ Optimize analysis methods: likelihood analysis and machine learning tool � Triggering of B-mesons in p+p collisions ◦ B->J/Psi ->e+/e-, EMCal trigger. Exploration work by Sasha L. ◦ D meson calorimetry trigger, turn on. ◦ Large DCA triggers? Jin Huang <jhuang@bnl. gov> HF TG Meeting 14
An vulnerability (opportunity) of HF-probes CMS, Phys. Rev. Lett. 113 (2014) Phys. Lett. B 726 (2013) 251 -256 s. PHENIX scientific proposal Lund String, Eur. Phys. J. C 17, 137– 161 (2000) Jin Huang <jhuang@bnl. gov> HF TG Meeting 15
b-quark jet selection: b-jet correlation � Event topology to select b-quark jet ◦ b-jet in correlation with opposite-going Bhadron, b-jet and photon � � s. PHENIX provides good acceptance on b-di-jet and b-jet – non-prompt. D correlations Helps on purity of jet and b-tagging too b-jet + B-hadron, model Physics Letters B 750 (2015) 287– 293 b di-jet, CMS 2016 di-jet acceptance in s. PHENIX CMS PAS HIN-16 -005 Jin Huang <jhuang@bnl. gov> s. PHENIX scientific proposal HF TG Meeting 16
Di-b-jet asymmetry: s. PHENIX projection CMS-HIN-16 -005 On-going s. PHENIX projection - By Darren Mc. Glinchey (UCB/LANL) - Pythia 8 (Hard. QCDBBar) - Fast sim. (truth jets) - Assuming di-b-jet tagging perf. - Efficiency 50% - High purity (100%) - RAA = 0. 6 assumed - s. PHENIX proposal lumi. (100 B MB) Jin Huang <jhuang@bnl. gov> HF TG Meeting 17
Hadron – b-jet balance � � Phys. Lett. B 750 (2015) 287 -293 Xuan Li (LANL) also started investigation of correlation of b-jet in correlation of a non-prompt D 0 -meson (→pi + K) Goal: tag initial quark energy + vector for non-prompt D measurements, probe b-quark energy loss and fragmentation; access to lower zj cut-off comparing to di-b-jets correlation; help purity of b-quark-jet tagging 175 pb-1 p+p 40 B 0 -10% Au+Au, RAA= 0. 6 Updates in simulation meetings: https: //indico. bnl. gov/conference. Display. py? conf. Id=2684 Jin Huang <jhuang@bnl. gov> HF TG Meeting 18
Hadron – b-jet balance: Angular correlations � � Transport model calculations (D-meson) S. S. Cao et al, PRC 92 (2015) 054905 Xuan Li (LANL) also started investigation of correlation of b-jet in correlation of a non-prompt D 0 -meson (→pi + K) Goal: tag initial quark energy + vector for non-prompt D measurements, probe b-quark energy loss and fragmentation; access to lower zj cut-off comparing to di-b-jets correlation; help purity of b-quark-jet tagging (Not observed) (Observable) Updates in simulation meetings: https: //indico. bnl. gov/conference. Display. py? conf. Id=2684 Pythia distribution scaled to stat. of 40 B 0 -10% Au+Au events, Eff. Jet=0. 5, Eff. D=0. 6 Jin Huang <jhuang@bnl. gov> HF TG Meeting 19
More ideas on b-quark jet selection? Jet structure tools � CMS-PAS-HIN-16 -006, inclusive jet p+p 5. 02 Te. V Jin Huang <jhuang@bnl. gov> HF TG Meeting 20
Jet finding and fake rejections � HF-jet are based on jet, relying on jet finding development lead by JS TG ◦ Emphasis on purity and reach to lowest-possible-p. T jet, where mass effect is maximized ◦ No statistics for b-jet beyond p. T > 50 Ge. V/c � HF-jet specific: response in detector for b-favored jet, unfolding and media modification ◦ Require join study with JS TG in term of experience and toolkit developments s. PHENIX scientific proposal Challenging in purity Jin Huang <jhuang@bnl. gov> HF TG Meeting 21
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