Plans for S2 inspiral analyses

LSC Inspiral Analysis Group

June 27. 2003

Circulation restricted to LIGO-I members

04/19/23 LIGO Scientific Collaboration - IUL Group 2

IUL Group S2 Science Goal #1

• Binary Neutron Star Search» upper limit on the rate of binary

neutron star inspirals in the universe with target population to include Andromeda unless we see something

• Anticipated results» Assume weak detection from

Andromeda» Efficiency ~ 0.2 and T~800 » R~25 /yr /MWEG » (S1: 170 /yt/MWEG)

04/19/23 LIGO Scientific Collaboration - IUL Group 3

IUL Group S2 Science Goal #1

• Improvements over S1 analysis» Data Quality cuts up front» H1-H2, H1-L1, H2-L1 & H1-H2-L1 coincidence» Improved veto studies (safety tests helped by many hardware injections)

• New features» New chi-squared tests» Improved PSD estimators (use median and better averaging)

• Use hierarchical pipeline:1. Trigger in L1 at S/N = L1

2. This corresponds to a S/N in H1 of H1

3. And a S/N in H2 of H2

4. H1 = (sigmaH1/sigmaL1)*L1 ~ 0.45*L1 (using SenseMon ranges)

5. Depending on threshold cuts for each IFO we will have double or triple coincidence coherent analysis

04/19/23 LIGO Scientific Collaboration - IUL Group 4

IUL Group S2 Science Goal #2

• Non-spinning binary black hole (BBH) search» Undecided what the scientific paper at the end will be: null result or rate

upper limit.» Anticipated max. distance to optimally oriented binary is up to 7Mpc at ~20

Msun assuming standard post-Newtonian waveforms

• New aspects of this search» Uncertainty in waveforms mean looser chi-squared cuts» Use detection template family

– must Monte-Carlo efficiency to all known model waveforms (costly)

» Instrumental vetoes and coincidence far more important » Will add coincidence with a burst and ringdown search after end of inspiral

search

• Anticipated results:» First search (event candidate, if we got extremely lucky) for BBH inspiral

04/19/23 LIGO Scientific Collaboration - IUL Group 5

Binary Black Hole Range

Standard post-Newt

Effective One Body

04/19/23 LIGO Scientific Collaboration - IUL Group 6

IUL Group S2 Science Goal #3

• Search for low-mass BBH mergers in Halo» i.e. MACHO binary search

• Search will follow binary neutron star pipeline» Only new aspect of search will be population model

» Large uncertainties in mass distributions

» Probably insensitive to spatial distribution

• Anticipated results:» High efficiency, T~800 hrs R ~ few a year

04/19/23 LIGO Scientific Collaboration - IUL Group 7

Task list and schedule

• Template Bank Search: » Report by July 1. (Duncan, Patrick

B.)

• Data Quality: Use what's available on July 1.

» (Peter S. and Gaby)

• Veto Studies: » First report by July 1. Tabulate, but

also worry about how to integrate this information automatically into pipeline (Yunyong, Weili, Brian, Nelson, Natalia).

• Template Search Validation:» Report July 15th (Stas+)

• Coherent Code: » Report July 15th (_____)

• Beta Pipeline: » Report July 15th. (Patrick)

• Time of Arrival template Chisq:» Report July 15th. (Valera)

• Spin Statistics for BH-X binaries:

» Report July 15th (Philippe,Vicky)

• Report on Burst/Inspiral trigger coincidence,

» July 22nd (Saikat,Warren)

• Face to Face: LLO July 25th. » Review initial pipeline output. (All)