First Year S5Low Mass Compact Binary

CoalescencesDrew Keppel1

representing theLIGO/VIRGO Compact Binary Coalescence Group

1California Institute of Technology

March LSC MeetingBaton Rouge, LA 19 March 2007

LIGO-G070085-00-Z

Summary

• Start of run (11/4/05) to anniversary of LLO joining S5 (11/14/06)

• Template Banks:» 2pN inspiral templates» 2 - 35 M in total mass

» Minimum single component mass of 1 M

• Search pipeline (filter, vetoes, coincidence)• Playground Data Results• Expected Full Data Upper Limit• Hurdles to overcome

First Year S5 BNS Horizon Distance

Distance to optimally oriented 1.4,1.4 M BNS at = 8

First Year S5(playground only)

Nov 4, 2005 -Nov 14, 2006

First Year S5 BNS Horizon Distance

Distance to optimally oriented 1.4,1.4 M BNS at = 8

First Year S5(playground only)

Nov 4, 2005 -Nov 14, 2006

2010 30

4

8

12

16

Template Bank

BBH SearchBNS Search

Mass 1

Mas

s 2

Parameter Accuracyof recovered software injections

• Accuracies similar to previous searches

Parameter Accuracyof recovered software injections

• Errors in recovered accuracy dominated by higher mass region» Coincidences now done

according to metric which is intrinsically mass dependent

Vetoes• Two types of Vetoes are used to eliminate background triggers

» Data Quality Vetoes– Currently there is a preliminary list of vetoes for the first calendar year of S5– Working with the Burst group to generate a consistent set of vetoes

» Signal-Based Vetoes 2 veto (waveform consistency test)– r2 veto (2 time above threshold)– Effective distance and consistency cut

• Initial tuning for first calendar year very similar to tuning done for S5 Epoch 1 BNS and BBH searches

» We were doing something right!

Accidental Coincidencesand Simulated Signals

• Initial tuning of pipeline on playground triggers, time slides and injections» All triggers from playground times only

• Measure background by applying time slides before coincidence• Add simulated signals to detector data to evaluate analysis performance

Software Injections

S5 1 Year Playground DataBackground and Foreground

Lower Mass RegionMchirp < 2.0

Higher Mass RegionMchirp > 8.0

Mass DependentUpper Limit

• Sorting triggers by mass to give different backgrounds and foregrounds for different mass regions» Allows different loudest events and injection recovery efficiencies

for different mass regions» Helps to prevent spurious glitches, which affect the higher mass

portion of parameter space, from influencing the upper limit we can place on lower mass portion of the parameter space

• Background may also be dependent on epoch» Looking into correct way to combine different epochs

Projected Upper Limitfor Non-playground Data

• Expected Non-playground Time:» H1H2L1:132.6 days» H1H2: 75.8 days» H1L1: 12.4 days» H2L1: 15.5 days

• Projected Upper Limit Ng Rate S4 Result

» Total Mass = 3 M: 222 L10 2.1x10-2 L10-1yr-1 1.2 L10

-1yr-1

» Total Mass = 6 M: 643 L10 7.6x10-2 L10-1yr-1 2.3x10-1 L10

-

1yr-1

» Total Mass = 10 M: 2020 L10 2.1x10-3 L10-1yr-1 4.5x10-1 L10

-1yr-1

Future Issues forS5 1 Yr Low Mass CBC Search

• Deal with memory management issues arising with combining a year’s worth of triggers» RAM» Disk space

• Finalize tuning, open the box and follow up» Goal is a result presented at July LSC Meeting 2007

The End