compass frc meeting 21/11/2017 status of compass-ii · compass cern group composition 21/11/2017...

COMPASS FRC meeting 21/11/2017

Status of COMPASS-II

1. Status of the Collaboration• Collaboration composition• Manpower• Running Plan• Papers and talks

2. Status of 2016/2017 DVCS/SIDIS Run 3. Preparations for 2018 Run4. Plans for future (beyond 2020) 5. Summary

Oleg Denisov (CERN / INFN – Torino)

COMPASS co-spokesperson

Composition of the COMPASS-II Collaboration in 2016

21/11/2017 Oleg Denisov 2

Minor changes compare to 2016

• 12 Countries + CERN

• 24 Institutions

• 210 Members: 130 Full Members

(Nov. 2017) 61 PhD students

~20 Master and Diploma students

Informal discussion with possible new collaborators, outcome will depend on

future beyond 2020.

Manpower: key rolesSupported by CERN


Technical Coordinator Caroline Riedl (Uni. Of Illinois): OK, Project Associate contract until

mid of 2018 (can be extended)

Analysis Coordinator Bakur Parsamyan (Torino): OK, scientific associate until mid of 2018

Run Coordinator 2017 Jens Barth (Mainz): Scientific Associate till 30/06/2018

Run Coordinator 2018 Jens Barth (changeover) / Vincent Andrieux (Uni. Of Illinois)

Co-spokespersons: Oleg Denisov (INFN, Torino) – Scientific Associate position till

31/01/2018

COMPASS Collaboration thanks CERN for supporting these key persons on site

Gerhard Mallot retirement –COMPASS CERN group composition


Medium-size experiments as COMPASS can not be managed and operated without a

reasonable size CERN group (Thanks a lot to CERN for the support provided so far).

1.) Current CERN group composition (EP-SME-CO):

- 1. Jens Barth (2017 Run Coordinator) – Paid Scientific Ass. (SASS)

- 2. Didier Cotte (Hall technician) - Paid by Collaboration (STAF)

- 3. Oleg Denisov (Spokesperson) - Paid Scientific Ass. (SASS)

- 4. Bakur Parsamyan (Analysis Coord.) - Paid Scientific Ass. (SASS)

- 5. Caroline Riedl (Technical Coord.) – Project Associate (PJAS)

- 6. Gerhard Mallot (Resource Coordinator, EXSO) – staff (STAF)

- 7. Dominik Steffen (DAQ) - Doctoral Student (DOCT)

- 8. Ondrej Subrt (DAQ) - Doctoral Student (DOCT)

- 9. Annika Vauth (Beam Coordinator) - Applied Fellow (FELL)

-10. Barbara Badelek - Corresponding Ass. (CASS)

2.) Thus normally COMPASS is supported with 2 PSA, 1-2 PJAS, FELL, 2 DOCT and

a CERN Staff position.

3.) Gerhard will retire on Nov. 30, 2019 but has to use ~ 1 year of vacation beforehand (he

will stay as resource coordinator till Nov. 30, 2019)

4.) A limited duration CERN position (3-5 years) overlapping with Gerhard’s contract would

help a lot to manage the Collaboration during the approved programme and beyond 2020.

Plans for Running until LS2


2016 - DVCS/DVMP (SIDIS in parallel) m p m p g

2017 - DVCS/DVMP (SIDIS in parallel)

2018 - Polarised Drell-Yan pp mmX

MoU extension in the 2016 FRC meeting (expiration date is December 31st

2017) - Gerhard’s talk.

Publications and conferences


Conferences: so far 88 talks in 2017, (15 more compared to 2016)

Another 7 papers are in pipeline….

DVCS 2016/2017


• Analysis of 2016 data is in progress, no indications for a difference in positive and negative muon data in 2016 (<2%)

• Default strategy for 2017 data taking remains equal intensity for positive and negative muons, data taking has started in the beginning of May

• Important: SPS beam dump was substituted and the new one performs well

• Physics data taking has been started on June 3rd, so commissioning has been done very efficiently


The 2017 DVCS and SIDIS Run

Drell-Yan 2015Analysis status


First ever polarised Drell-Yan data were published in PRL,

One of PRL referees: “This paper represents a major milestone in nucleon

structure study, has deep impacts to the strong interaction theory QCD and

physics in general, and should attract attentions from a wider audience.

This ground-breaking paper should definitely be published in PRL.”

Drell-Yan 2018Preparation is started


Final goal after 2nd year: unambiguously

verify Sivers asymmetry sign change

We aim to triple the total polarised data

sample and to improve the PT + overall

spectrometer performance (Trigger, Beam

telescope etc.) in order to achieve the

statistical uncertainty on Sivers asymmetry

(2015+2018) of ~ 0.025-0.03 and to collect

the world’s largest kaon and anti-proton DY

data sample.

Our SPSC referees warned about heavy

ion run requested by NA63, it will damage

our program.Changeover preparation:

Key CERN groups contacted for change over for 2018 DY starting October 23.

TE-CRG (cryogenics), EP-DT (PT magnet controls), EN-HE (heavy handling), ...

Schedules being worked out, no show stoppers.


Change over for Polarised Drell-Yan run

Group function comment Contacted?

Various TE-CRG-ML

Helium, piping, magnets Reserve people, Check availability yes

EN-EL Electricity, cabling 400V, 48V, AUL yes

TE-EPC-LPC Power supplies Ready Jan. 2018 yes

DT-DI Programming, connection yes

EN-HE Platform, rotation, shielding yes

TE-CRG-OD Helium consumptionCold box Dewar LN2

Check for larger DewarCheck piquet service

yes

EN-EA CEDAR/magnet support Asking soon

Drell-Yan 2018Preparation is started Cooling water tower man.



Beyond 2020 dedicated Workshop

- Good attendance (>100 physicists), large interest- 11 “outside” review talks – Jefferson Lab, RHIC, Fermilab, KEK (Japan) BEPC II (IHEP, Beijing), NICA (JINR, Dubna), CERN (After, LHCb), GSI (Panda), J-PARC (Japan), EIC – China;- 7 COMPASS talks (chronol.) – SIDIS, GPDs, Chiral Dynamics, astrophysics (dark matter), Drell-Yan, hadron spectroscopy;- 2 “round-table”-like discussions on possible future with hadron and muon beams;

- Outcome of the Workshop:- RF Separated antiproton/kaon beam would provide a unique opportunity for future fixed target COMPASS-like program at CERN- Existing muon and hadron beam allows to extend current COMPASS program by doing unique or first class measurements of exclusive processes, SIDIS and Drell-Yan

QCD Preamble


Short term COMPASS future


Short term future COMPASS Proposal (extension of the COMPASS-II experiment for running after LS2 (2019-2020)) was submitted to the

SPSC ~2 month ago.

Decision by the SPSC (recommendation) is expected in January 2018

Short term COMPASS future I :SIDIS – transversely polarised Deuteron Target (6LiD)


- TMD PDFs and Transversity h1(x) are flavour dependent.- Flavour separation data on both proton (NH3) and deuteron (6LiD) transversely polarised targets.- Proton data set is factor of 4 compare to deuteron (see error bars for transversity h1(x) in the plot below)-It is logical to increase the deuteron data set (so far the only data sets available are COMPASS (6LiD) and CLAS (3He) targets).

Competitors: - No competitors inour kinematic range,Jlab will start by 2020

Short term COMPASS future I :Proton radius measurement in elastic mu-p scattering

21/11/2017Oleg Denisov

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Long term COMPASS future


Long term future COMPASS-like experiment LoI (new physics) is under preparation now. The goal is to bring together strongly

renewed COMPASS-based Collaboration (will have a different name)enthusiastic about opportunities of doing physics at CERN with

conventional and newly designed RF separated kaon and antiproton beams. The total duration of the program reaches 7-8 years of

running with hadron and muon beams.

Indications by European Strategy Group is expected at the beginning of 2020 (May?).

Current LoI ContentLoI is open for new ideas/proponents


A.) RF separated kaon and anti-proton beam:

- 1. Hadron spectroscopy

- 2. Drell-Yan physics

- 3. Primakoff with kaon beam

- 4. Direct Photons with kaon

- 5. RF separated beam

B.) Standard muon beam:

- 1. DVCS with trans. polarised proton target

- 2. Elastic muon proton scattering

C.) Standard hadron beam:

- 1. Polarised/Unpolarised DY with various targets

- 2. Absolute cross-section measurements p + He -> pbar X

- 3. Hadron spectroscopy with antiprotons

D.) Spectrometer upgrades – hardware

For the moment it is ~50 pages long document

RF separated antiproton/kaon beam


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Assumptions: – 8 x 107 antiprotons for 1013 ppp (10 seconds) (optimistic estimate by Lau Gatignon);

– we assume here 4 x 1013 protons.

Antiprotons RF separated beam: 3.2 x 107 /s - Gain is a factor of 50 compared to the standard h-

beam for Drell-Yan experiment (~1% of h- beam 6x107 /s dominated by π-)

Using the same assumption for RF separated kaon beam, possible kaon beam intensity is 8 x 106

/s - Gain is a factor of 80 compared to to the standard “spectroscopy” h- beam

High intensity RF separated beam will provide unique opportunities forHadron Spectroscopy and Drell-Yan physics

“Normal” h- beam composition:

~97% (π) ~2.5%(K) ~0.5% (pbar)

RF separated beam – Hadron spectroscopy Light and Strange Meson Spectrum


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RF separated kaon beam ~ 8 x 106 /s, beam momentum ~100 GeV

What can we contribute as COMPASS?• State-of-the-art high-resolution spectrometer with full PID • Advanced analysis techniques being developed in the light-quark sectorMethod to be used: Kaon beam diffraction scattering on LH2 and thin nuclear targets

- Goal: ~10 larger data sample than existing worldwidewhat would make possible to have similar to pion diffractionwave set: 88 waves in 11 t’ bins; - COMPASS could rewrite PDG tables for strange mesons - Extend studies of chiral dynamics to strange sector

No real competitorsJParc - ~105 /s, low momenta kaons, JLab - ~104 /s, K0 long beam, lower momenta

- Measurement of kaon Compton scattering via the Primakoff effect and an RF

separated beam for determination of the kaon polarisability, and kaon-photon induced

strange meson production

- Prompt photon production to access gluon component of KaonUnique opportunities

Running/planed Drell-Yan experiments,COMPASS (π- beam on p

↑) – unique experiment


Experiment ParticlesEnergy(GeV)

xb or xtLuminosity

(cm-2 s-1)Pb or Pt (f) rFOM# Timeline

COMPASS(CERN)

p± + p↑

190 GeVs = 19

xt = 0.1 – 0.3 2 x 1033 0.14 Pt = 80%f = 0.22

1.0 x 10-3 2014-2015, 2018

PANDA(GSI)

pbar + p↑

15 GeVs = 5.5

xt = 0.2 – 0.4 2 x 1032 0.07 Pt = 90%f = 0.22

1.1 x 10-4 >2025

AFTER p↑+ p 7 TeVs = 120

xb = 0.1 – 0.9 2 x 1032 0.06 Pb = 100%? 2.3 x 10-5 >2020

NICA(JINR)

p↑+ pcolliders = 26

xb = 0.1 – 0.8 1 x 1032 0.04 Pb = 70% 6.8 x 10-5 >2023

PHENIX/STAR(RHIC)

p↑+ p↑colliders = 510

xb = 0.05 –0.1

2 x 1032 0.08 Pb = 60% 1.0 x 10-3 >2018

fsPHENIX(RHIC)

p↑+ p↑s = 200s = 510

xb = 0.1 – 0.5xb = 0.05 –

0.6

8 x 1031

6 x 1032 0.08Pb = 60%Pb = 50%

4.0 x 10-4

2.1 x 10-3 >2021

SeaQuest(FNAL: E-906)

p + p120 GeVs = 15

xb = 0.35 –0.9

xt = 0.1 – 0.453.4 x 1035 --- --- --- 2012 - 2017

Pol tgt DY‡

(FNAL: E-1039)p + p↑

120 GeVs = 15

xt = 0.1 – 0.45 4.4 x 1035 0 –0.2*

Pt = 85%f = 0.176

0.15 2018-2019

Pol beam DY§

(FNAL: E-1027)p↑ + p

120 GeVs = 15

xb = 0.35 –0.9

2 x 1035 0.04 Pb = 60% 1 2020

‡ 8 cm NH3 target / § L= 1 x 1036 cm-2 s-1 (LH2 tgt limited) / L= 2 x 1035 cm-2 s-1 (10% of MI beam limited) *not constrained by SIDIS data / # rFOM = relative lumi * P2 * f2 wrt E-1027 (f=1 for pol p beams, f=0.22 for p- beam on NH3)

RF separated beam – Drell-Yan


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RF separated antiproton/kaon beam, the maximal possible beam intensity(very rough estimate) of ~3-4x107 /s can be reached (antiprotons) and ~8x106 /s (kaons)

Assuming flux of 1x107 /s for kaon/antiproton,background free high mass range 4 < Mμμ < 9 GeV/c2 and

140 days of data taking with the efficiency of 2015 Drell-Yan Run.

The overall gain for RF separated beam compare to previous experiments is factor 50 to 100

RF separated beam – Drell-Yan kaon-induced DY


• Kaon-induced DY is the only source of information on kaon structure which is unknown • Together with pion induced DY will represent the unique data set for unstable particle structure study• Unpolarised case, possibility to use different nuclear targets targets (like LH2, Al, W, Cu):

1. Kaon structure function (PDFs)2. Nucleon strange quark structure 3. Fundamental Lam-Tung relation for kaon4. Boer-Mulders TMDs (quark-spin – quark-kT correl.) for kaons5. EMC effects & flavour dependent EMC effects (kaons)6. Kaon Distribution Amplitude, J/Ψ production mechanism

11

1

/( )

/

K

Kd dx ux

d dx up

p

-

-

NA3 Collaboration, PLB 93, 354 (1980

X1pT (GeV/c)

NA10 π-W COMPASS K-W

No competitors, unique data

Summary


• Collaboration is solid and performing well

• Preparation for 2018 Drell-Yan Run started with no delay (concern: cooling water)

• “Beyond 2020” workshop (CERN, March 2016) and IWHSS (Cortona, Italy, April 2017) success, strong interest in the hadron physics community

• RF separated antiproton/kaon beam will provide unique opportunity for meson spectroscopy and meson structure study

• Existing muon and hadron beams allows to enrich current COMPASS program

THANKS!


Next event – IWHSS’17 in Cortona (Italy) April 3-5 2017Beyond 2020 (CERN, March 2016), PBC (CERN, September 2016)


The goal is to start Proposal writing for new physics program beyond 2020

Summary

• Collaboration is solid and flexible, new group

• We expect still satisfactory statistics to be collected in 2016, even if SPS beam dump is a limiting factor

• Preparation of 2017 – minimal changes

• A number of new systems were commissioned and operated in 2016

• Collaboration is looking forward for second year of polarised Drell-Yan in 2018, the request was supported by SPSC in October 2016 and we expect Research Board to take a decision on Dec. 7th 2016

• We have started to shape the new physics program “beyond 2020”, and we are very enthusiastic about RF separated beam option


COMPASS-II MoU


MoU was agreed upon at the 15th FRC meeting, Dec. 2012

signed by CERN Directorate S.B. in February 2013

Signed by:

Czech Republic Italy

Japan Poland

Russia-JINR USA

France

Not yet signed by:

Germany-BMBF (all institutions signed separately)

Portugal-FTP

Russia (Protvino IHEP and LPI signed separately, no CF contribution yet)

The Russia’s issue has to be resolved at higher than collaboration level

since mid 2017 - New Minister of Science and Education Ministry


The 2012 μ+/μ- normalisation issue and

expectations for 2016/17 Run

During the 2012 run, the DVCS data was collected at μ+/μ- beam intensity of ~

2.7. The event yields in the physics analyses have been normalized to the

corresponding integrated beam fluxes. Even after proper normalisation the

exclusive events yields for the two beam charges showed a residual

discrepancy of ~20% to ~25%, depending on the considered reaction:

- ~10% is introduced by CAMERA time-of-flight detector

- while the rest can be attributed to the track reconstruction and/or the muon

triggers.

Based on these results the decision was taken

to run in 2016/2017 with equal μ+/μ- beam

Intensities.Our major concern was a limited beam intensity extracted to

COMPASS in 2016 because of the SPS Beam Dump issue (factor

1.5 lower compared to expectations).

With nominal beam intensity (as it is delivered now: 150x1011) and

2 spills in 36 s it is in reach to achieve our expectations for

collected statistics (87% compared to Proposal) even running with

the same μ+ and μ- beam intensity.

Important: thanks to very efficient work during the

commissioning period we are in physics data taking

since 03/06/2017.

RF separated beam – Hadron spectroscopy Charmonium-like mesons


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RF separated antiproton beam, beam momentum ~ 20 GeV

Method: antiproton-proton annihilation

Goal: charmed hybrids and exoticsstudy in the mass range higher than reachable in PANDA

Complementary to LHCb(p-pbar annihilation – gluon rich environment and it allows high spin states)

Otherwise no competitors for the next at least 10 years

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