# Presentation: 049587

**	**
**	****                  **
**	****Triggering on Electromagnetic Objects**
**	****	****	****	****(e********/********)**** **
**	****	****	****        ****at L1 & L2**
**	****	****              ****Mrinmoy Bhattacharjee**
**	****	****	****     ****SUNY, Stony Brook**
*                                   **D0 EM ID Vertical Review*
**	****      ****	****         ****Thanks to: **
**	****	****            ****Arnaud Lucotte, Kin Yip, Paul Grannis,**
**                            ****Manuel Martin, Levan Babukhadia,**
**                            ****Marc Buehler, Dave Toback, Dylan Casey**
**	****	****	**

## Overview

_**Overview**_

**Motivation**
**D0 Trigger system (L1 & L2)**
**L1 EM Trigger:**
**	****       ****Detector information at L1**
**	****	****High p****T**** EM trigger & low p****T**** di-electrons**
**                       ******** ****Algorithm **
**	****             ***** Timing**
**                ******** ****Efficiencies & Rates**
**L2 EM Trigger:**
**	****	****Detector information at L2**
**	****	****High p****T**** EM trigger & low p****T**** di-electrons**
**             ******** ****Algorithm **
**  ****	****	****        ***** Timing**
**                ******** ****Efficiencies & Rates**
**Summary**

## Motivation

**Run II peak inst.lum. 2 ******** 10****32****cm****2****s****-1 **
**Total accumulated data ********2 fb****-1**
_**Measurements with High PT e**__****__**/**__****_
****** **** ********M****t ****< 3.0 ****GeV/c****2**
**	**** ******** ********ttbar****/********ttbar ****~ 10%**
**    ******** ****anomalous properties of top**
**        ****(******** = 8.0pb/4.2pb pp********tt+X /pp********t or t+X)**
****** ********M****w ****~ 40MeV/c****2**
****** ****sin****2********W**** from Z asymmetry **
****** ****pdf from W asymmetry**
**    ****fwd e****-****’s improve M****W**** systematic (RunI)**
**	**** ****(1.6********10****6**** W ******** e******** / 160 ********10****3**** Z ******** ee)**
****** ****QCD with WZ**
****** ****qqbar ******** W******** & WW******** **
**	**** ****trilinear couplings &   **
**    ****radiation zero effect **
****** ****SUSY searches**

## Motivation

**    **_**B Physics with electrons**_
**   ******** ******** ****bbar**** ~ 100 ********b**
**    ******** ****CP violation in B****d**** ******** J/********K****s**** system**
**    ******** ****Bs mixing**
**    ******** ****Rare B decays**
**    ******** ****Measurements on B****c**** meson**
**   **_**Low p**__**T**__** e**__**-**__**/**__****__** from **__****__**, **__****__** & Drell Yan**__** **_
**   **
**           **
**	****	**
**                     **_***Accumulate large samples of ***__***e***__******__***/***__******_
***	***
***      ******High signal efficiency/background rejection***
***      ******Possible with (trk - energy) matching***
***    ******	******   ************ ******Calorimeter (energy threshold)***
***           ************  ******CFT, CPS, FPS & SMT (tracking)***
**            ****	**

## L1 & L2 Trigger Configuration

** ****     **
**                                                       ****Level 1                         Level 2         **
**	****	****	****	****   **
**	**** ****	**
**	****	****	****                 ****                            **
**                                                                                                      **
**               ****                                                             ****                 **
**	****F**
**	****E****	****	****        ****	****	****	****                              ****	****	****	****	****	****               **
**	****	****	****	****	****	****               **
**	****	****	****	****	****	****            **** ****	****	****             **
**	****	****     **
**	****	****     ****L1 Accept****	****	****	****                            **
**                                                                                           **
**	****	****	****	****	****Expect 128 Trigger Terms**** ****	****	****	****                                    ****to go to 256**
**	****	****	****	**** **

_**L1 Trigger Framework**_
**combine EM Tower, track/cluster**
**FORM 128 TriggerTerms**

**Input**** ****7MHz**
**output 7KHz**
**time 4.2********s**

**Input 7KHz**
**output 1KHz**
**time 100********s**
**5% dead time**

**L1 Muo**** **

**CFT Ax**** **

**CPS Ax**** **

**L1CFT, CPS**** **

**CPS St**

** ****FPS**

** ****CAL**

** ****Muon**

**L1 FPS**** **

**L1 CAL**** **

**L2 CTT**** **

**L2 CPS**** **

**L2 FPS**** **

**L2 CAL**** **

**Silicon**** **

_**L2 Global**_** ****Cal+PS+CFT**
**FORM 128 TriggerTerms**

**L2 Muo**** **

**L2 STT**** **

## Challenges

**  ****	****  **_**Major Challenge:**_** **
**        ****Input Rate to L1 ~ 7.6MHz at 10****32****cm****-2****s****-1**
**                                                               **
**	****	****	****	****	****      ****	****	****	****	****	****	****	**
**	****<p****T****> e****-**** for J/********ee****-****     <p****T****> e****-**** for W,Z top                              ~ 2.7 GeV/c central       decays**
**   ****~ 3.1 GeV/c forward      ~ 30-40GeV/c**
**    ****Low threshold in CAL     Although threshold high    **
**    ******** ****high QCD rate         S/B ~ 1/50,000 **

## Definition of EM object (e-/)

** ****     **
**                                                                                                  **
**	****	****	****	****	****	****	****	****	****	****	****                  *****e************ = CFT trk + CPS cluster***
***                                       ******+ CCEM Trigger Tower***
**	****	****	****	****	****	****	****	****	****	****	****            *********** ******= No Trk + CPS cluster***
***                                       ******+ CCEM Trigger Tower***
**	****	****	****	****   **
**	**** ****	**
**	****	**
**	****	****	**** ****	****              **
**	****	****	****	****             *****e************ = MIP + FPS clust ***
***                                       ******+ ECEM Trigger Tower***
***	******	******	******	******	******	******	******	******	******	******	******       ************ ******= No MIP + FPS cluster***
***                                       ******+ ECEM Trigger Tower***

_**Forward Region**_

_**Central Region**_

## L1: Tracking with CFT 

**   **
**	**_**Inner most tracking device at L1 is CFT (|**__****__**|**__****__**1.5)**_
**	**
**                                                                                                    **
**	****	****CFT divided into 80 sectors 4.5****o**** wide**
**	****	****Fibers shared between nearest sectors**** **
**	****	****      ****to allow for bending in magnetic field**
**	**_**Tracking Algorithm at Digital FE (FPGAs)**_******   **
**        ******** ****Allowed trajectories computed analytically for **
**	****       ****p****T****>1.5GeV/c (equations)**
**	****	**
**         ******** ****Match hit patterns in all 8 layers with **
**          ****pre-programmed equations (anchor on H layer)**
**	**

**Sector boundary**

**Track**

**CFT Sector 1**

**CFT Sector 2**

**A**

**H**

## L1: CFT Tracking (# of eqns, binning) 

**   **
**	****	****	****	****	**** **
**        **
**	****	****     **
**	****	****    ****N****eqn**** ******** 1/p****T**** per sector (******** 16K eqns)**
**	****	********Tracks binned in p****T**
**	****	****  ****pT binning gives sharper turn on than offset binning**
**	****        ****[1.5-3.0], [3.0-5.0], [5.0-10.0], [********10]Gev/c**
**	**

## L1: Energy Clustering with CPS & FPS

**   **
_**CPS next on path of EM particle (|**__****__**|**__****__**1.5)**_
_** **_
** ****3 layers of nested triangular strips (1280/layer)**** **
**	****	****1 Axial Layer, strips || to z-axis**
**          ****2 Stereo Layers, strips at ~ 23****0**
**    ****Preceded by Solenoid & 1X****0**** Pb (********2X****0****)**
** ****CPS divided into 80 sectors 4.5****o**** wide (same as CFT)**
** ****At L1 only Axial strips used**
**	**** **_**FPS available at L1 in 1.6**__****__**|**__****__**|**__****__**2.5**_
** ****	****       ****FPS divided into N/S, each side 16 ******** sectors**
**       ****4 Layers of nested triangular strips & 2X****0 ****Pb**** **
**	****	****2 layers infront (**_**MIP**_**) of Pb; 2 behind (**_**shower**_**)**
**	****	****layers has strips making 22.5****0 ****(U & V)**
**      ****MIP deposition front of Pb coincident with EM shower behind used to trigger on e****-****/******
**	****	****	****	**** **
**        **
**	****	**
**	**

## L1: Cluster Finding ||<1.5 (CPS)

**   **
**	**** **_**Clustering Algorithm at Digital FE (FPGAs)**_****
**Contiguous strips > Threshold forms a clusters**
**Two separate thresholds used for clustering**
**	****   ****2-5 MIPs (low) for low p****T ****electrons   (J/********ee)**
**	****    ****5-10 MIPs (high) for high p****T**** electrons (W,Z,top)**
**Only Axial strips used for L1 triggering**
_**	**__**	**_** ****xxLLHLxx is one 1 high cluster (NOT 2 lows & 1 high)**
_**Number of clusters/layer**_****
**	****  ****These are input to L2**

**3 MIPs**

**5 MIPs**

## L1: Cluster Finding 1.6<||<2.6 (FPS)

**   **
**	**** **_**Clustering Algorithm at Digital FE (FPGAs)**_****
**	****   ****Contiguous strips > Threshold forms a clusters**
**	****   ****Two separate thresholds used for clustering**
**	****	****     ****3-5 MIPs (low) for low p****T ****electrons   (J/********ee)**
**	****     ****5-10 MIPs (high) for high p****T**** electrons (W,Z,top)**
**    ****Cluster confirmed by MIP deposition (********0.3MIPs)**
**	****	****     ****7 strip wide window centered at cluster center &**** **
**	****	****   ****detector origin**
_**Number of shower clusters/layer**_****** **
**These are input to L2**

**3 MIPs**

**5 MIPs**

## L1: From DFE to L1 CFT/CPS, FPS & L2

**   ****	**_**Info sent to L1 CFT/CPS**_** ******
**	**** ****—****	****# of (********) tracks per p****T**** bin with hi/low/NO CPS axial tag  **
**    —    ****# of isolated tracks & ********p****T**** of all tracks**
_**	**__**Info sent to L1 FPS**_** ******
**	****—****	****# of U/V clusters (hi/low) with/without MIP hit**
**  ****	**_**Info sent to CFT L2**_****
**	****—**** **** ****list of 6 tracks per p****T**** (46 max per quadrant)**
**     ****    ****Low p****T**** (********3GeV/c):  H layer hit & (A-H) offset reported**
**         ****High p****T**** (********3GeV/c): H layer hit & p****T**** reported **
**	****     ****Track ALSO matched to hi/low CPS Axial cluster**
**	**_**Info sent to CPS L2**_****
**	****— ****From CPS Axial (48 max per Quadrants)**
**	****	****Axial cluster list with address and width (high & low)**
**	****      ****Axial clusters matched to (±) CFT tracks in ********3 strips**
**	****	****Track p****T**** if present**** **
**	****— ****For CPS Stereo**** ****(48 max per N/S U/V)**
**               ****Stereo cluster list with address & width (high & low)**** **
** ****	**_**Info sent to L2 FPS**_** ****(48 max per N/S U/V)******
**	****—****	****Stereo cluster list with address and width (high & low)**
**	****	****w/o MIP hit (48 max per quadrant)**

## L1: Tracking & Clustering efficiency

**	****	**
**	****	****	****	****	****	**** **_**CFT alone**_** **
**	****	****	****	****	****	****	**
_**	**__**	**__**	**__**	**__**	**__**	**_**efficiency ********90%**
_**	**__**	**__**	**__**	**__**	**__**	**__**FPS alone**_** **
**	****	****                    ****	****	****	****efficiency ********98%**
**	****	****	****	****	****	****rejection   e/******** ********3          ****	**
**	****	****	****                            **

## L1: Calorimeter

**	**_**Task Performed at L1 (Preamps & Analog **__****__**)**_
**	****Trigger towers (TT) are 0.2********0.2 in ******** ****	**
**	****TTs > 2.5, 5, 7 & 10GeV used as seed**
**	****   ****L1 EM ET rounded in 0.25GeV steps**
**	****   ****L1 Total ET truncated in 0.5GeV steps**
**	**
**	****Information available at L1**** **
**	****     ****(1) For each ref set ******** ******** TT’s > Threshold (all ********)**
**	****   ****(2) ********EM E****T**** / ******** Had E****T**** in Large Tile Area (LTA) **
**	****	****      ****(1 LTA = 8 TT’s in ******** & 4 TT’s in ********)**
**	****   ****(3) Number of TT’s above threshold in LTA**
**	****# TT’s > threshold for each Ref set can be made available for Quadrants**
**	****      ****(1 Quadrant = 4 TT’s in ******** & 8 TT’s in ********)**** **
**	****Send 64 AND/OR terms to L1 Framework****      **
**	****               ****	**

## L1: Trigger Terms

**	**
**	****Trigger information from different detectors are sent to the Trigger Framework to be matched & final trigger decision**
**	**_**EM Trigger Terms**_**	**
**	****TTK(n,p): CFT track p****T**** > p.**
**	****TEL(n,p): CPS cluster/CFT track p****T****(>p) match within 4.5****0.**
**	****TPQ(n,q): CPS cluster/CFT track (>lo/1.5Gev) match by quad.**
**    ****TNQ(n,q): CPS cluster (>lo) by quadrant (no track = EM).**
**	****TDL(p,s): 2 trk/CPS cand. (pT>1.5 or 5GeV), same/opp sign**
**	****FPQ(n): FPS cluster/CAL tower(>2.5GeV) match by quad.**
**	****FQN/S(n): FPS cluster/CAL tower (>2.5GeV) match by quadrant (e+********).**
**    ****CEM(n,E): Cal EM tower (>2.5,5.7,10GeV) in CC or EC.**
**    ****CEQ(n,q): CPS cluster/CAL Tower (>2.5GeV) match by quad q.**
**	****CER(n,E,********): 1/2 CAL EM tower >2.5/5GeV in N,S,CC **
**	**
**       **

## L1 electron algorithm (high pT)

**	**
**	**_**Central (**__****__**1.6)**_
_**	**_**1 CPS cluster ******** high matched to 1 track ********5GeV/c in 4.5****0****   **
**	****1 Calorimeter EM tower ******** 7-10GeV (********1.6) matched to CPS cluster by quadrant**
**                   **
**	**_**Forward (1.6**__****__**2.6)**_
_**	**_**1 FPS cluster ******** high + MIP confirmation   **
**	****1 Calorimeter EM tower ******** 7-10GeV (1.6********2.6) matched to FPS cluster by quadrant**
**	**
**	****Track/MIP matching to PS optional; perform only if rates high**
**                                                    **
**	****	****	****	****	****	****	**
** **

**            ****Cal EM >7GeV**

**|********|********1.0**

**1.6 ******** |********|********2.6**

## L1 EM trigger rates (high pT)

_**	**_**  ****Rates at L=2********10****32****cm****2****/s**_** **_**  **
** ****	**
**	**** ****Cluster/Track & CCAL Quadrant match**
**	**** ****Cluster & ECAL Quadrant match**
**	****   ****CEM(1,10,C)                    200      W mass, QCD ******** **
**         ****CEM(1,7,C)CEQ(1)TNQ(1)       62        QCD ******
**	****   ****CEM(1,10,C)TEL(1,5)             3      W mass, WZ ******** **
**	****   ****CEM(1,10,N/S)                 690      EC W mass**
**	****   ****CEM(1,10,N/S)FQN(1)         400        FWD EM**
**      ****CEM(1,10,N/S)FPQ(1)         200      EC W mass**
**	****	****Rates highly dependent on thresholds in CAL**** **
**	****	****Quadrant matching give ********2-4 in rates rejection**
**	****	**

**|********|********1.0**

## L1 Trigger timing issues

_**	**_
**      ****FE is 32 deep pipe line**
_**	**_**L1 Trigger:****	**
_**  **_
**	**
**	****L1 decision conveyed to AFE in ~25 crossings**
**	****Upon L1 accept AFE/DFE send L2 data **
**	****	****4.8********s deadtime due to SVX readout & empty pipeline**** **
_**	**_**Readout to L2:**
_**	**_**Have to be completed within 36 crossings (4.8 ********s)**_**	**_

## L2 EM Trigger

_**	**_**Advantages at L2 are:**
**	****	****(1) Large decision time 100********sec**
**	****	****(2) Finer detector information available**
**             ****-- clustering in PS**
**             ****-- clustering in CAL**
**	****	****(3) Due to more time finer matching can be **
**             ****performed**
**	****	**
**	****	****     ****-- L1 CAL/PS matching in quadrant**
**	****	****     ****-- L2 CAL/PS match within 0.2********0.2 **
**                 ****in ******** **_**	**_

## L2: CAL Preprocessor

_**	**_**L1 EM Trigger based on following reference set**
**	****	****	****2.5, 5, 7 & 10 GeV E****T**
**	****  ****(1) L2 uses TT’s above low threshold ref. set**
**	****  ****(2) Find 2nd. Maximum in 3********3 around seed**
**     ****(3)  E****T****EM  = ****E****T****EMseed ****+ E****T****2nd ****> Thr**
**     ****(4)  EMF = E****T****EM****/(E****T****EM****+E****T****HAD****) **
**     ****(5)  T****ISO  ****= ******** E****T****(EM+Had)/E****T****EM****  ****( 3********3 ******** - seed )**
**	****	****       ****=**** ****E****T****EM****/********ET(EM+HAD) ****(3********3 ******** includes seed)**
**	**
**	****Both EMF & Isolation useful in background rejection****  **

## L2: CAL Efficiency, Rates & Timing

_**	**_**(In 1.6********2.6)**
_**	**__**L1 seed tower **__****__**7GeV / **__****__**10GeV**_
**           ****ETEM ******** 10GeV / 12GeV**
**      ****EMF   ******** 0.85 **
**      ****T****ISO    ******** 0.4**
**	****  ****p****T                ****15Gev/c     20GeV/c   32.5GeV/c**
**    ****L2/L1         93.3%       99.5%      100.0% **
**	****   “            ****86.0%       100.0%     100.0%****     **
_**	**_** **
**    **_**Dijet Rates**__** **_
_**	**__**	**_**        ****L1(1,7GeV)   L2(1,10GeV)   L2(1,12GeV)**
_**	**_**@2E32       900Hz        145Hz         90Hz**
**	**_**L2 CAL Timing**_** ****(available 50********sec)**** **
**	****L2**** ****Seed cut   0.5GeV  1.0GeV  1.5GeV  2.0GeV **
**   ****# of seeds      77        19       10         7**
**   ****Time ********s         179       46       25        18****  **

## L2: CPS Preprocessor

**   ****At L2, CPS provides 3D point combining X,U,V **
**	****Input to L2PP**
**          ****Axial = cluster address, width & threshold (h/L), **
**	****	****    ****tracks p****T ****if present  **
**     ****Stereo = cluster address, width & threshold (H/L)**** **
**        **
**        ****	****Algorithm**
**Hit U,V ******** X****uv ****(</=1280) & Z****uv  ****(±125cm)**
**X****uv ****-True X within ±10 Strips (0.05 in ********)**
**Calculate ******** from parameterization vs. Z****uv ****(0.004 in ********)**
**Calculate ******** from Axial hit strip**
**Bin CPS ********,******** into 0.25********0.25 for CAL matching at L2 Global **
**   **
**	**
**     ****OUTPUTS of L2 CPS:**_** **_
_**	**__**	**__**	**_**HEADER: Cluster Count**
**	****	****	****DATA:    Cluster ******** bin, **
**	****	****     ****	****	**** ****Cluster ******** bin, HiLo, Track Tag**

## L2: FPS Preprocessor

**   **
**	****At L2, FPS provides 3D point combining U & V**** **
**     ****Input to L2PP**** **
**	****  ****Stereo =**** ****cluster address, width & threshold (H/L), MIP bits**** **
**   **
**   ****Algorithm**
**  ******** ****parameterized as hit U + V**
**  ******** ****parameterized as hit U - V**
** **** ****Confirm  ******** as valid (within FPS detector)**
**  ****Bin FPS ********,******** into 0.25*0.25 for CAL matching at L2 Global**
**       **
**	****OUTPUT of L2 FPS:**
**	****	****	****HEADER: Cluster Count**
**	****	****	****DATA:    Cluster ******** bin, Cluster ******** bin, **
**	****	****	****	**** ****HiLo, MIP Bit pattern**

## L2: Preshower Timing

**   **
**	**
**	****Available 50********sec**** **
**	****Timing ******** number of clusters**** **
**	**** ****CPS Low threshold ~ 90% in 40********sec (500Hz devoted)**
**	**** ****FPS Low threshold ~ 95% in 24********sec (500Hz devoted)**

**5MIPs**

**3MIPs**

**     ****FPS**

**       ****CPS**

## L2: STT & CTT Preprocessor

_**	**__**No STT:**_
_**	**_**L1CFT to L2CTT (Quadrants)**
_**	**__**	**_**Converts L1 p****T**** information to track p****T**** (lookup table)**_**	**_
**	****	****Extrapolates H layer ******** to ********EM3**
**	****	****Merge track lists & order in p****T**** & convert to L2 object****	****	****Send info to L2Global upto 184 tracks**
_**	**__**	**_
_**	**__**With STT:**_
_**	**_**L1CFT to STT sextant boards**
_**	**__**	**_**48 tracks per sextant**
_**	**__**	**_**covers 60****o**** in ******** & overlap region allow for track bending**
**	****	****ordered in p****T**** bin**
**	**** ****Sextant boards to L2STT**
_**	**__**	**_**46 tracks per sextant**_** **_
**	****	****Matches CTT tracks to SMT clusters and refit**
**	****	****get track p****T**** ********,********, dE/dX & b**
**	****	****send tracks to L2CTT in 12 cables 30****o**** in ********	****	**
_**	**_**L2STT send tracks to L2CTT**
_**	**__**	**_**Merge 12 track lists p****T****	**
**	****	****Merge 12 track lists & order in b**
**	****	****Send tracks to L2Global upto 184 tracks**_**	**__** **_

## L2: CTT Timing

_**	**__** **__**L2 Preprocessor Time depends on # of tracks**_
_**	**_**Time taken to make L2 objects, sort them in pT **
**    ****& output them to L2Glb**_**	**_
_**	**_**Ntrk      0     1      2    4     8    16    32      64**
**	****Time(********s)  0.8  1.3   1.9  3.1  5.7  11.8  27.8  78.8**
**             ****Study performed on 233MHz board**
**	****            ****Alpha timing 1.6 factor better**_**  **_

## L2 electron algorithm (high pT)

**    **_**Central (**__****__**1.6) **_**(L2 Global 50********sec)**
_**	**_** ****1 CAL tower ********7GeV**_**	**_
_**	**_** ****1 CPS Axial cluster ******** 5MIPs + CFT Track tag**
**     ****CPS 3D match of X,U,V ******** ********, ******** **
**	****	****(1) Axial ,U, V = 5MIPs**
**	****	****(2) Axial = 5MIPs & U,V = 3MIPs**
_**	**_** ****Different detector info combined at L2 Global**
**            ****CPS-CAL match within 0.25********0.25 in ******
**       ****                                            ****(Z ******** ee, 93.7%)**
**       ****(1) efficiency loss for E****T ****<40GeV****            ****(W+Jets, 84.0%)**
**       ****	****	****	****	****    ****     ****(Z ******** ee, 99.0%)**
**	**** ****(2) regains lost electrons at low E****T****         ****(W+Jets, 95.4%)**
_**	**__** **_** **

## L2 electron algorithm (high pT)

**     **_**Forward (1.6**__****__**2.6) **_**(L2 Global 50********sec)**
_**	**_**   ****CAL Cluster (E****T****EM****)> 10GeV,**
** ****CAL EMF >/= 0.85**
** ****CAL Isolation </= 0.4**
** ****FPS 3D match of U,V ******** ********, ******
**	****	****(1) U, V = high****	****	**
**	****	****(2) U = high & V = low OR vice versa **
**Different detector info combined at L2 Global**
**FPS, CAL matching within 0.25********0.25 in ******
**  ****	****	**
**	****	****       ****Z ******** ee 94.3% - 97.5% (HH / HL.OR.LH)**

**@ 2********10****32****cm****2****/s**

******2 PS-Cal match**

**900Hz**

**145Hz**

**80Hz**

## B Physics: di-electron trigger

**	**** ****  **_**Triggering on low pT di-electrons:**_
**          ****Requirements: **
**- Low E****T**** cut for in EM CAL     (2.0 GeV) **
**- Low threshold PS clusters     (2.0-.5.0 MIPs) **
**- Low p****T**** track/charge sign      (1.5 GeV/c) **
** **
**L1 trigger**** **
_**FPS**_
**2 CALEM towers > 2.5GeV**
**2 PS candidates **
******=3 wedges**
_**CPS**_
**2 CALEM towers > 2.5GeV**
**2 PS candidates+Track **
**  ****match within ********3 strips**
**        **
**CAL / PS Cluster (quadrant) = factor 2 QDC rejection**
**Level-2 trigger: **
**- Matching: CAL / PS clusters in 0.25********0.25 in ********       **
**- EM fraction, DR(e-,e+), M (e-,e+), DF(e-,e+),E****T****ISO**

## B Physics: di-electron trigger

**	**_**L1 & L2 Trigger Performance:**_
**	**
**	****Central Region (CAL EM>2.5GeV, CPS>3MIPs)**
**	****	****eff (pT>1.5GeV) = 10%, Rates = 50Hz**
**	****Forward region (CAL EM>2.5GeV, FPS>5MIPs)**
**	****	****L1 eff (pT>1.5GeV) = 10%, Rates = 1.0-1.5KHz**
**	****	****L2 eff (pT>1.5GeV) = 4-5%, Rates = 50Hz****	****	**

## Summary

**   **_**L1 Trigger**_
**	****electron (pT>5GeV) efficiency**** ****> 95% (7-10GeV CAL)**
**	****background rates**** ****1.5 Hz (7GeV CAL thr)**
**                        ****200 - 500 Hz (10GeV CAL Thr)**
**	**
**	****di-e (pT>1.5GeV) efficiency**** ****~ 20%(cen), 10%(fwd)**
**	****background rates**** ****1-2kHz (cen+fwd)**
**	****PS/CAL Quadrant matching ********2-3 in rates**
**	****   **
**	**_**L2 Trigger**_**                            **
**	****electron (pT>5GeV) efficiency ****> 95% (10GeV E****T****EM****)**
**	****background rates ****50-100 Hz (10GeV E****T****EM****)**
**	**
**	****di-e (pT>1.5GeV) efficiency ****~ 10%(cen),5%(fwd)**
**	****background rates ****100Hz**** ****(cen+fwd)**
**	****CAL EMF, Isolation, Invariant mass helps**
**   ****PS/CAL 0.25********0.25 in ******** match = ********2-3 in rates**

## L1: CFT pT binning 

**   **
**  **
**Backup 1**

## Central & Forward Preshower 

**   **
**	****CPS**
**	****FPS**
** **
** **
**Backup 2**

## Trigger Task: L1 

**   ******** ****L1 Calorimeter  Dan Edmunds**
**    ******** ****tsim_l1cal    Josh K, Mary Anne C., Philippe L.**
**	****	****       ****(Input = CAL cells; Output = TT’s & AND/OR)**** **
**	******** ****L1 framework & tsim_l1frm   **
**	****	****Cristian Opazo-Castillo, Beatriz Pinero**
**	****	****       ****(64 AND/OR terms from L1 CAL)**
**	******** ****CFT/CPS(axial)**
**	****	****AFE/DFE Kin Yip, Fred B.**
**	****	****L1 & L2 COL/BC   Manuel M, Juan**
**	****	****	****	****	**
**	******** ****FPS**
**	****	****DFE Levan B., Manuel M.**
**	****	****L1 COL/BC Satish D., Manuel M.**
**	****	****L2 COL/BC Mrinmoy B. Manuel M.**
**	******** ****tsim_l1ft (CFT+CPS+FPS)    **
**	****	****	****  ****Kin Yip, Levan B., Mrinmoy B., Satish D.**
**	****             **
**	**** ******** ****STT Overlap & sextant boards**
**	****	****	****  ****Brian Connoly, Manuel M.,William Lee**
**	**** ******** ****L1 Trigger Terms  **
**	****	****	****  ****Jerry Blazey **
**	**** ****	**** **
**Backup 3**

## Trigger Task: L2 

**   ****	**
**	****              **
**	**** ******** ****L2 Global & tsim_l2glb (include tools)   **
**	****	****Roger Moore, Dylan Casey**
**	****	****       ****(combine CAL, PS, CFT; write EM objects)**** **
**    ******** ****L2 STT & tsim_l2stt   **
**	****	****Silvia R.,John H.,Wendy T.**
**	****	****       ****(perform track fitting, track pT, impact)**
**    ******** ****L2 CAL & tsim_l2cal   **
**	****	****Robert Hirosky, Marc Beuhlar**
**	****	****       ****(cal cluster, EMF, Isolation)**
**	******** ****L2 CTT & tsim_l2ctt  **
**	****	****Dave Toback, Drew Baden**
**	****	****       ****(track pT, impact, ********EM3****, track sign)**
**	**** ******** ****L2 PS & tsim_l2prs (CPS+FPS)  **
**	****	****Mrinmoy B.**
**	****	****       ****(cluster ********, threshold, MIP pattern, track tag)****	**** **
**Backup 4**