COMPASS FRC meeting 21.10.2020 CERN - Status of COMPASS and perspectives for future - CERN Indico
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COMPASS FRC meeting
21.10.2020 CERN
Status of COMPASS and perspectives for future
1. Status of the COMPASS-II Collaboration
• Collaboration composition
• Manpower
• Running Plan
• Papers and talks
2. Preparations for 2021 Run
3. COMPASS++/AMBER
• Phase-I & Phase-II
• Outcome of the PBC and ESPP reviews
• Phase-I approval, short term running plan
4. Summary
Oleg Denisov (CERN / INFN-Torino)
COMPASS co-spokesperson
Composition of the COMPASS-II Collaboration in 2020
Minor changes compared to 2019
• 12 Countries + CERN +JINR
• 24 Institutions
• 201 Members:
134 Full Members
43 PhD students
23 Master and Diploma students
Discussions with possible new collaborators,
depending on future beyond 2021.
13.11.2018 Jan Friedrich 2
Manpower:
Key roles supported by CERN in 2020
The CERN group of COMPASS in 2020 (Gerhard Mallot retirement at the end of 2019):
current members:
- Stefano Levorato (Technical Coordinator, PJAS till 31/12/2021)
- Fulvio Tessarotto (COMPASS co-spokesperson, SASS till 31/01/2021, extension
has been asked)
- Johannes Bernhard (EN-EA-LE)
Moritz Benjamin Veit and Martin Zemko (DOC) are effectively working for COMPASS but
supervised by Johannes Bernhard (EN-EA-LE) and Giovanna Lehmann Miotto (EP-DT-DI)
In case we have Gentner students Augusto Ceccucci (EP-SME group leader) has agreed to
supervise he/she/them
COMPASS Collaboration thanks CERN for supporting or having supported these key
persons on site
In view of the extension of COMPASS running until 2022 and progress on COMPASS++/AMBER,
it is extremely important that CERN remains a reliable partner of the experiment
13.11.2018 Jan Friedrich 3
Publications and conferences
new in 2020
Paper in pipeline for 2020:
1. Transversity and Lambda polarization in polarized SIDIS at COMPASS Announced: 22.06.2018 Drafting Committee:
F. Bradamante, R. Joosten (chair), E. Kabuss, A. Kotzinian, A. Moretti, C. Riedl Submission goal: Autumn 2020.
Status: DC’s work is almost accomplished. Soon to be circulated within COMPASS.
2. Recovery of the exotic meson π1(1600) with JPC = 1–+ in 190 GeV/c π – + p → π – π –π + + precoil
To be Re-Announced: (first announcement – 11.07.2014), target journal – PRD Drafting Committee: Y. Bedfer, S.-
U. Chung, W. Duennweber, M. Faessler, B. Grube, F. Krinner, S. Paul, D. Ryabchikov, S. Wallner . Submission goal:
Autumn 2020. Status: ongoing drafting and analysis activities.
3. Measurement of qT-weighted transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process
Announced: 17.11.2017. Drafting Committee: B. Badelek, A. Bradamante, A. Kotzinian, R. Longo, J. Matousek
(chair), B. Parsamyan, C. Quintans, A. Efremov. Submission goal: Autumn 2020. Status: last DC meeting in mid-
March, then suspended. Drafting to be restarted.
4. Study of double J/ψ production at COMPASS. Announced: 29.11.2019. Drafting Committee: A. Gridin, A. Guskov
(chair), S. Koshkarev, A. Kotzinian, B Parsamyan, A. Sandacz, C. Quintans, M. Zavertyaev
Submission goal: Autumn 2020. Status: regular (biweekly) DC-meetings till August (to be restarted). Analysis
activities.
13.11.2018 Jan Friedrich 4
Impact of COVID’19 to the SIDIS 2021/22 Run preparations
With respect to the pre-Covid preparation schedule we have a delay of ~3 months
(matching the present draft SPS schedule)
almost 30 people form the COMPASS Collaboration have been working on site respecting restrictions:
permanently:
Stefano Levorato, Norihiro Doshita, Vincent Andrieux, Christophe Mendez-Pires, Moritz Benjamin Veit, Michael Peskov, Oleg
Denisov, Fulvio Tessarotto, Sergei Gerasimov, Martin Zemko, …
temporarily:
Vladimir Anosov, Rainer Joosten, Christian Dreisbach, Johannes Giarra, Johannes Mertz, Kaori Kondo Horikawa, Gerhard
Reicherz, Igor Konorov, Antonio Amoroso, Maxim Alexeev, Bakur Parsamyan, Triloki Triloki, Livio Rinaldi, Mauro Gregori,…
+ great contribution from CERN:
EP-DT, TE-CRG, EN-EL, EN-SMM, EEN-EA, EN-CV, EN-HE, …
+ many contractors personnel
( We received complains for using too many masks …)
29/09/2020 EHN2-WG meeting - CERN Fulvio Tessarotto 5
2021/22 SIDIS Run preparation schedule
Infrastructure Flammable gas barrack and detection system renovation Crane rail renovation
DC04 and Silicon trackers – delay in preparation
The large DC4
chamber has been
repaired. It is stored in
the COMPASS Clean
Area, waiting for the
completion of the
testing, equipping and
installation in the
spectrometer.
The cold Si tracker
system has been
prepared but the
cabling of the
control PLC could
not be performed
yet.
COMPASS PT preparations
Magnet preparation on schedule
- Rotary pump installation
- LN2 pre-cooling line
- Leak checks
Target cell assembling
-- NMR coils
-- Thermosensors
-- He3 feed pipe
-- Target holder
Target cell installation performed
Cooling down of PT magnet started
9
COMPASS PT new resources + manpower:
Yamagata grant + new group with huge expertise in PT
The COMPASS Yamagata group has applied
for a grant to JSPS (Japan Society for the
promotion of Science)
Grants-in-Aid for Scientific Research (KAKENHI)
The grant has been approved
for a total budget of 155.2 M¥ (~1.4 MCHF)
period: September 2020 – March 2024
29/09/2020 EHN2-WG meeting - CERN Fulvio TessarottoCOMPASS SIDIS 2021/22 Run preparations:
• potential risks for the apparatus readiness
• implications of the split transverse target run
Detector Status Missing Potential risk of Delay due to COVID Notes Split run Effect
Polarized Target Well advanced, cooling in progress, fully GUNN diode in delivery Between low and very low, the full PT and field rotation procedure are Request of support from EP-DT Double loading of the target material
supported by Yamagata, most of the expert being tested will be tested before EOY and CRYO needed
on site, collaboration with Dustin Keller (Before COVID schedule full test of PT in 20202021) Material loading
foreseen April 2021
DC4 Good Final tests and transport in Low, for the data taking readiness, the operation requires two weeks
COMPASS HALL intervention by Saclay (Before COVID schedule DC4 installed in
20202021)
COLD SILICON Detectors ready Cooling system Low, missing Saclay cabling, update and restart, already started the Saclay support and EP-DT
preparation of a working package with EP-DT to have the system restarted
also in case non possible Saclay support, may request some budget
integration, but feasible.
The tracking telescope is important in the definition of the (x,y,z)
coordinates of the incoming muon, its absence degrades the data quality
but do not prevent the data collection
RICH WALL Delayed MDT tests and remounting Low, the MDT testing has restarted, readiness by April 2021 (foreseen for
December 2020)
RICH -1 GAS cleaning delayed Gas precleaning Low: the gas has been delivered , pre-cleaning is foreseen to restart during Delayed radiator gas availability Recovery and Refilling to be done two
the fall of 2020 begin of 2021, all machinery ready. Enough time to clean affects PID, does not prevent data times
the gas before the BOR taking restart despite degraded
data quality
H1 Delayed Low: Despite the delay in the components delivery al material has been INFN support needed +
ordered and is available at CERN. In the next weeks the final scintillator BONN/MAINZ experts on site
refurbishing will start; the detector will be ready in spring 2021
DAQ Low, at least one FEE type should be tested during the dry run: it will Spare components delivery may
guaranteed faster restart in 2021. be delayed, still should be
available before the BOR
GEM Delayed Medium/Low, nearly all components available, major difficulty related to May require some longer
the restriction due to COVID (Clean room work). In contact with our commissioning time with beam
colleagues, in case of need some expertise may be rerouted to support the
work activity or move it to CERN
ALL detectors Low; due to the long stop the spectrometer commissioning may require Detector recommissioning twice, short
longer time. Action: restart it with a reasonable anticipated commissioning winter shutdown is preferrable
in 2021 to have the full spectrometer efficiency as soon as the beam will be
available.
11COMPASS++/AMBER: approximately 10 years-long effort,
LoI is submitted in Jan. 2019
We have started to work on physics
program of possible COMPASS successor
~ 10 years ago,
A Number of Workshops has been
organized, for detail see
COMPASS++/AMBER web page:
https://nqf-m2.web.cern.ch/
http://arxiv.org/abs/1808.00848
Apparatus for Meson and Baryon Experimental
Research > 270 authors
21/10/2020 Oleg Denisov 12COMPASS++/AMBER PHASE-1/2
PHASE-1 proposal was submitted to SPSC in June 2019
PHASE-1
Conventional hadron and
muon beams
2022 2025 and beyond
PHASE-2
Conventional and RF-
separated
Hadron/Hadron
and muon beam
2026 and beyond
21/10/2020 Oleg Denisov 13COMPASS++/AMBER – being a new proposal was
examined in the period 2016-2020 within Physics
Beyond Colliders initiative (CERN) I
The goal of the PBC initiative (on request of CERN DG F. Gianotti) was to make a review of complete set of a
newly proposed non-collider experiments at CERN. Those proposals were in a different stage of reparation
and were belonging to a different fields of physics: QCD physics, nuclear physics, search for dark matter etc.
COMPASS++/AMBER was represented in 2 working groups (QCD Physics and Extracted Beams) by
O.Denisov and G.Mallot (substituted by J.Friedrich)
The final goal of the PBC initiative was to submit a summary review document as input to the 2020 European
Strategy for Particle Physics update process. The final public ESPP update event took place in Granada in
May 2019. The ESPP update process is restarted once in 7 years.
21/10/2020 Oleg Denisov 14COMPASS++/AMBER – being a new proposal was
examined in the period 2016-2020 within Physics
Beyond Colliders initiative (CERN) II
21/10/2020 Oleg Denisov 15COMPASS++/AMBER – being a new proposal was
examined in the period 2016-2020 within Physics
Beyond Colliders initiative (CERN) III
21/10/2020 Oleg Denisov 16COMPASS++/AMBER – ESPP update outcome II
The most important output of the ESPP 2020 update COMPASS++/AMBER is on
the list of future facilities in the period 2021-2030.
This statement does not mean an approval, but invitation to go ahead with the project
and submit a proposal on a long term plans, no show stopper
21/10/2020 Oleg Denisov 17COMPASS++/AMBER – ESPP update outcome III
Deliberation Document on the 2020 update of the European Strategy for Particle Physics:
Many of the proposals for new experiments at CERN are on a scale such that they could be
considered for approval in the usual manner by the scientific committees and the Research Board.
21/10/2020 Oleg Denisov 18Last but not least
COMPASS++/AMBER PHASE-1 Proposal was recommended for
approval on Oct. 13th 2020 at the 139th Meeting of the SPSC.
(according to the preliminary version of the minutes supplied by our Referees)
21/10/2020 Oleg Denisov 19Summary
1. Preparations for 2021/22 transverse deuteron run is on track,
minor delay is accumulated because of COVID’19
2. Analysis of 2015-2018 going a bit slower than expected, but
progress is significant and perspectives are very promising
3. Low publication rate in 2019 will be compensated by much higher
publication rate in 2020 (3 papers are already submitted, 4 more
papers are next to submission)
4. COMPASS++/AMBER PHASE-1 Proposal is recommended for
approval by the SPS Committee in its October 2020 meeting
21/10/2020 Oleg Denisov 20Thank you! 21/10/2020 Oleg Denisov 21
SPARES 21/10/2020 Oleg Denisov 22
Two bearing columns of the COMPASS++/AMBER
There are two bearing columns of the
facility:
1. The issue of the emergence of the
hadron mass
2. Proton spin (largely addressed by
COMPASS)
FIRST, EHM:
How does the all visible matter in the universe come
Higgs generated masses of the valence quarks:
about
M(u+d) ~ 7 MeV M(u+s) ~ 100 MeV M(u+u+d) ~ 10 MeV
and what defines its mass scale?
Unfortunately, the Higgs-boson discovery (even if
extremely
important) does NOT help to answer this question:
The Higgs-boson mechanism produces As Higgs mechanism produces a few
only a percent of visible mass, thus the
small fraction of all visible mass
mass scale is defined by QCD
The Higgs-generated mass scales explain
neither mechanisms
the “huge” proton mass nor the ‘nearly-
masslessness’ of the pion
21/10/2020 Oleg Denisov 23Publications (published) 21/10/2020 Oleg Denisov 24
Publications (submitted) 21/10/2020 Oleg Denisov 25
Publications (in pipeline) 21/10/2020 Oleg Denisov 26
Publications (in pipeline) 21/10/2020 Oleg Denisov 27
Many progress in the data analysis and
in the MC chain
Definition of the best time length of each spill (to save the largest statistics)
Check of the muon flux determination
Refined muon identification
Better tuning of the muon halo beam in the MC
2D efficiencies of all detectors
Efficiencies of each slat of the Trigger Hodoscope
fitted along the slab
Very precise description of all the detectors
(Trigger Hodoscopes with dead zone,
ECALs, CAMERA, FI03, MM,…)
Even of a lot of time lost due to the evolution
of the TGEANT versions (which were giving too large
outgoing muon momentum, bad acceptance…)ECAL0, ECAL1, ECAL2 Calorimeters with
6500 cells in total
Data:
identification of bad cells
determination of the T0 timing for each cell
calibration using muon beam for each period
resulting pi0 mass: still a small evolution for ECAL2 and ECAL1 (LED/FEM corrections not fully operational)
an extra correction will be applied at the UserEvent level
ECAL0 ECAL1 ECAL2
P09 period P09 period P09 period
MC: the exact description of Shashlik modules (in ECAL2 and ECAL1) in TGEANT (0.2 mm paper sheet
around each of the 154 double layers lead/scintillator) has implied a new calibration of the photon energy
deposited in each cellexclusive 0 production for 2016 data
P09-t10: p p 0
Kinematic fit and cuts applied on a few observables:
A or B angle of the hit in the A or B ring of CAMERA: |( - fit)/| < 2.5 with
Z momentum of the incoming and outgoing muon: |( pZ - Pzfit)/| < 5
x or y position of the 2 photon clusters: |( x - xfit)/| < 5
For 2 exclusivity variables
BEFORE applied cuts AFTER for the Proton kinematics
reconstructed using
CAMERA or the spectrometer
= CAMERA - spectrometer
Large improvement of
Signal/background
zA = zACAMERA – zA (zB and spectrometer)exclusive 0 production for 2016
data P09-t10: p p 0
MC studies for the exclusive process: with HEPGEN++ with GK2016 model
for the SIDIS background: with LEPTO
0 collected in ECAL0 and ECAL1
Normalisation of these 2 unknown contributions
using the data events inside the M cut range
and different samples increasing the background
renormalized
Sharing: 54 5% for
LEPTO
Work in progress, extended soon to larger statistics including also P08 and P07Drell-Yan analysis
Drell-Yan and Charmonium analyses: J/psi TSAs
Very preliminary transverse spin asymmetries from
the J/psi mass range: 2.85 < M (/GeV/c²) < 3.4
The dilution factor f, the fraction of polarizable material
relevant for the process under study (f=σpol/σtot(ψ)), was
not yet considered here
Detailed evaluation of f, using NRQCD model for
Charmonium production (together with nuclear
PDF sets), in bins of qT and xN (or xF )Drell-Yan analysis
J/psi TSAs analysis and the dilution factor
Two Charmonium production models are compared:
ICEM and NRQCD (in Parton Reggeization Approach (PRA))
f
pT (GeV/c)
The extra-dilution due to event migration between
the 2 oppositely polarized target cells still needs to
be considered ongoing work
R. Vogt et al., NP A 982 (2019) 751
M. Nefedov et al., arXiv 1410.6421Drell-Yan analysis
Drell-Yan and Charmonium analyses: Acceptance
Both the Drell-Yan unpolarized asymmetries and
differential cross-section analyses require accurate
acceptance correction.
Disagreement between results obtained
from each of the dimuon trigger systems
(LL, LO, LM), by up to 10%, as shown at
SPSC report in May.
Important improvements in the MC description:
● 2D trigger efficiency maps (hodoscope slabs+trigger matrix) per data period
● Correction of hodoscopes position along the beam direction – ongoing
● Correction of hodoscope slabs length and staggering
● Beam description extracted from real data, per period (whenever relevant)
● 2D maps of detector efficiencies, per plane and per period – ongoingDrell-Yan analysis
Impact of trigger efficiency per period in the Acceptance
Ratio of acceptances: (with trigger eff. per period)/(with trigger eff. from P03)
Example: 1st 10cm of W target
LL
LO
Important effect, different per period and per trigger.
Also NH3 target is affected differently.You can also read
