HPS Collaboration Meeting

Jun 3, 2024, 1:00 PM → Jun 5, 2024, 5:00 PM US/Eastern

CEBAF Center F326-327 (Jefferson Lab)

Cameron Bravo (SLAC), Mathew Graham (SLAC National Accelerator Laboratory), Maurik Holtrop (UNH), Stepan Stepanyan (Jefferson Lab), Timothy Nelson (SLAC)

The Heavy Photon Search (HPS) collaboration will have its semi-annual meeting at Jefferson Lab from June 3 to June 5, 2024. Collaboration is busy with calibrating and aligning the 2019 and 2021 physics run data, preparing for the next run, and pursuing various physics analyses. At this meeting, we will hear updates from different working groups. We expect presentations on the progress of searches of canonical dark photons and other long-leaved particles, such as SIMPs and iDM. The business session of the meeting includes updates from the Presentation and Publication and The Executive committees (PPC and EC).

https://misportal.jlab.org/Ul/conferences/generic_conference/participants.cfm?conference_id=HPS_2024

 

Zoom: https://jlab-org.zoomgov.com/j/1605586280?pwd=cG5IV01hRE05WjNRcVAySXZ5WjJrZz09

 

Monday, June 3

Overviews and Updates

1 Wwelcome

Speaker: Stepan Stepanyan (Jefferson Lab)

Stepanyan_Welcome.pdf

Stepanyan_Welcome.pptx

2 Overview of Dark sector searches

Speaker: Timothy Nelson (SLAC)

HPS_DarkSectors_Collab_24.pdf

3 A Dark Photon Search with a JLab positron beam

Speaker: Bogdan Wojtsekhowski (Jefferson Lab)

Aprime_BW.pdf

3:00 PM Coffee Break

HPS Overview and Analysis updates

4 Hall B Status and Plans

Speaker: Patrick Achenbach (Jefferson Lab)

Achenbach-HallBStatus-03-06-2024.pdf

5 HPS Status and Plans

Speaker: Maurik Holtrop (UNH)

HPS Overview.pdf

Tuesday, June 4

Analysis Updates (cont.)

6 Overview of JLAB scinetific computing

Speaker: Nathan Baltzell (Jefferson Lab)

baltzell-hps-20240604.pdf

7 Analysis overview, plans and milestons

Speaker: Mathew Graham (SLAC National Accelerator Laboratory)

hps-awg-plans-june-4-2024.pdf

hps-svt-strip-killing-2016-kf (1).pdf

8 Global mass fit, and status and plans for bump hunt

Speaker: Emrys Peets (SLAC)

peets_bumphunt_jun24.pdf

10:00 AM Coffee Break

Analysis Updates (cont.)

9 SVT hit killing and the 2016 tridents shapes/rates

Speaker: Mathew Graham (SLAC National Accelerator Laboratory)

10 High pSum studies with hard z0 cut

Speaker: Tom Eichlersmith (University of Minnesota)

HPS_2016_Re_Exclusion.pdf

WARNING

I did not sync with Alic before making these results so the plots labeled with "Alic" are behind and not representative of his current results as shown in his talk. I also refer to the vertical impact parameter y0 with its legacy name z0 which could easily lead to confusion.

Momentum Smearing

In my backup slides, I have some preliminary investigations into how this momentum smearing is implemented in hpstr. The long story short is that it appears to be algorithmically correct, but the smearing factors have not been tabulated in a long time. Perhaps the next step is to re-calculate these smearing factors in order to determine if they have shrunk compared to the prior estimate.

 

Nprompt - is the number of dark brem produced within prompt readout acceptance.

Mass Window - 2sigma on either side

Maybe try using the z-cut from the original analysis in-place of z0

Maybe need to re-tune the placement of the z0 cut?

11 SIMPs analysis update

Speaker: Alic Spellman (UCSC)

simp_2016_hps_collab_20240604.pdf

Reconstruciton and data processing

12 2019: alignment and remaining issues

Speakers: Cameron Bravo (SLAC), Pierfrancesco Butti (SLAC)

CollabAlignment2019_Jun2024.pdf

13 2021: alignment and remaining issues

Speakers: Cameron Bravo (SLAC), Pierfrancesco Butti (SLAC)

hpsSpring24_ali21.pdf

14 SVT hit reconstruction

Speaker: Rory O'Dwyer (Stanford University)

HPS Hit_Cluster Reconstruction Update for Collaboration Meeting (1).pptx

3:00 PM Coffee Break

MC Update

15 MC overview

Speaker: Tongtong Cao (Jefferson Lab)

Overview of HPS MC.pdf

16 MC with pulser beam background

Speaker: Sarah Gaiser (SLAC)

MC_comparison_2024_06_04_sarah.pdf

17 Track extrapolation to EC

Speaker: Lewis Wolf (University of New Hampshire)

Track_Extrap_to_ECal.pdf

Wednesday, June 5

HPS collaboration business

18 EC meeting

Speaker: Timothy Nelson (SLAC)

EC Meeting Agenda

19 PPC report

Speaker: Alessandra Filippi (INFN Torino)

PPC_CM_may24.pdf

20 EC report

Speaker: Timothy Nelson (SLAC)

Collab_EC_2406.pdf

10:00 AM Coffee Break

Future Plans

21 X17 experiment in Hall B - A Direct Detection Search for Hidden Sector New Particles in the 3-60 MeV Mass Range

Speaker: Ashot Gasparian

Gasparian_HPS_ColabMeeting_June_2024.pdf

22 Generalizing the U(1) Current

Speaker: Cameron Bravo (SLAC)

u1curr.pdf

Discussions of the next run

23 Detector overview

HPS_detector.pptx

24 DAQ status and updates

25 Tracking status

Speaker: Timothy Nelson (SLAC)

Collab_SVT_2406.pdf

3:00 PM Coffee Break

Analisys mini-workshop

Convener: Mathew Graham (SLAC National Accelerator Laboratory)