Hi,
below are the minutes of today's analysis meeting.
We meet again on Wednesday June 28, 2006 at 13:30 at Bates.
Minutes:
-ep/en Montecarlo now ready (Vitaliy)
-ep quasielastic (Adam):
+Applying EG's corrections from elastic to deuterium quasielastic
+p_e - Pcalc without corrections ~15MeV, with EG's momentum
correction applied becomes ~5MeV, for pmiss<0.1GeV.
+Should use EG's correction for theta_e as well to recalculate
Pcalc, then see if p_e - Pcalc becomes zero.
+Missing mass peaks close to neutron mass within 2 MeV for
q.e. events including all missing momenta
+Concluding: ready to extract physics.
+Extract hPz from super ratio in quasifree limit
+Extract hPz from comparison with MonteCarlo
-Aki:
+Kinematic corrections from p(e,e'p) and p(e,e'p)gamma
+Elastic channels overdetermined by three variables only, but need
four corrections
+Utilize radiative events to give fourth independent condition.
+If method applied straight, yields unacceptably large angle offset
of 2-3 degrees.
+However, in p(e,e'p)gamma, offsets are evaluated at different
momenta than in the elastic channel, hence need extrapolation of
offsets to the elastic region. Results yields much smaller angle
offsets.
+All correction are currently parametrized as function of electron
angle.
-ep elastic:
+PRL draft being reviewed by MK, will send feedback to HG and CC
-ed elastic:
+PK resumed analysis, work in progress, using Chi's ntuples
+Pending on hPz
+PRL draft being reviewed by MK, will send feedback to PK and JC
+T20 analysis and drafting should be finalized first as T20 is utilized
in T11 paper
-en quasielastic
+EG to visit Bates from June 28 - July 22, 2006
-Misc.
+Sasha Ilyichev to visit Bates in July 10-20
+Mark Steadman to work on BLAST analysis from Jun 26 - Aug 18, 2006
Best regards
Michael
+-------------------------------------+--------------------------+
| Office: | Home: |
|-------------------------------------|--------------------------|
| Dr. Michael Kohl | Michael Kohl |
| Laboratory for Nuclear Science | 5 Ibbetson Street |
| MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
| Middleton, MA 01949 | U.S.A. |
| U.S.A. | |
| - - - - - - - - - - - - | - - - - - - - - -|
| Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
| Work: +1-617-253-9207 | Home: +1-617-629-3147 |
| Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
| http://blast.lns.mit.edu | |
+-------------------------------------+--------------------------+
---------- Forwarded message ----------
Date: Thu, 8 Jun 2006 11:35:49 -0400 (EDT)
From: Michael Kohl <kohlm@mit.edu>
To: "[BLAST_ANAWARE]" <Blast_anaware@rocko.lns.mit.edu>
Subject: Minutes of the 2006/06/07 analysis meeting
Hi,
below are the minutes of yesterday's analysis meeting.
Next week will be *NO* meeting. We meet again on Wednesday June 21, 2006 at
13:30 at Bates.
Agenda:
Assessment of status and near-term analysis goals
-ed elastic (tensor)
+Update analysis for most recent recrunch (v18-2004, v19-2005)
+Chi's thesis is based on earlier crunch version before geometry
change, however changes for T20 results are small)
+Spin angle determination was already updated and finalized by Chi
+Chi gave tutorial for MK, TA, and RF
+Review draft for publication
-ed elastic (vector)
+Update analysis for most recent recrunch
+Not clear how much time PK is able to spend on it
+Incorporate spin profile
+Need updated hPz from d(e,e'p) quasielastic analysis
+Draft for publication being reviewed
-deuteron en quasielastic: GEn and e,e'n tensor, see powerpoint file
+showed most recent extraction of GEn from 2004 dataset ver. v3_4_18
+third and fourth Q2bin significantly higher than Galster
+pmiss disagreement for highest pmiss bin, to considerable extent
responsible for larger GEn values in third and fourth Q2bin
+compare norm yield vs. pmiss with MC!
+update kinematic correction for neutron (time-of-flight), derive
neutron momentum correction from th_e, p_e, th_n
+revision of timing calibrations, including left sector Ohio wall ...
+Need updated hPz from d(e,e'p) quasielastic analysis
+More Montecarlo studies needed:
+e,e'n tensor asymmetries are finite even at pmiss->0, in agreement
with the MC shown. Data is consistent with Vitaliy's
analysis. However: MC used is in disagreement with Vitaliy's which
gives zero asymmetries in the quasifree limit and which disagrees
with the data
+Vitaliy working on new MC but currently stuck in debugging, has only
limited time available
+Quasielastic MC essential for both e,e'p and e,e'n analyses, as well
as ed vector elastic; recognized as bottleneck
+Suggested that Eugene comes to MIT for three weeks in July, with the
collaboration meeting embedded, work with Vitaliy on MC and shake
down e,e'n analysis
-deuteron ep quasielastic
+Apply Eugene's kinematic corrections, evaluate quality of corrections
+Determine own kinematic corrections from comparison with MC
+Waiting for MC from Vitaliy, apply spin profile
+Determine hPz from asymmetry fit to MC with spin profile
+Determine hPz from quasifree asymmetry analysis, use spin profile
bin-by-bin
+Thereby extract GEp/GMp from quasifree proton knockout
+Extract spin profile from quasifree asymmeries using proton form
factor parameterization, in order to investigate
sensitivity/consistency
+Re-evaluate AedV and AdT vs. pmiss, see if deviations "when the d-wave
starts to dominate" with Arenhoevel are still present after latest
recrunch
+Determine Pzz from fit to AdT MonteCarlo
-deuteron inclusive e,e' and GMn
+Nik's results are based on recrunch from before geometry update
+Analysis needs to be updated, new kinematic corrections need to be
applied
+Re-run inclusive MonteCarlo with updated spin angle profile
+Finalize extraction of GMn
+Prepare paper (Nik provided a first draft before he left)
-proton inclusive e,e' N-Delta
+Analysis based on v17, need to update to v20
+Compare normalized inclusive yield before and after introduction of
prescale factor for neutral trigger type 2
+Montecarlo: Implementation of Polrad into DGen ongoing. Working on
normalization of MC: Polrad starts only at pion threshold, and then
calculates both inelastic + radiative yields
+Below pion threshold and including elastic peak, Mascarad-MC should
describe yield; at threshold, POLRAD and MASCARAD should be smoothly
connected
+Verify implemented codes: Estimate yield du to radiation tail from
elastic scattering in delta region by hand, evaluate manually how
this affects asymmetry in delta region, compare to Polrad result
+Sasha (Alexander Ilyichev) has been invited to visit Bates in July,
week before and including collaboration meeting. Task is to make
implementation reliable
+Desirable to also implement radiative MC for exlusive pion
production channels. Aki, Yuan, Tavi: what can be done in
preparation before Sasha comes?
-p(e,e'pi+) (Yuan), see powerpoint file
+Large fraction of good e,e'pi+ events is triggered by piplus(!)
+In previous analysis it was required that electron is self-timed,
likewise that the assigned flighttime is shorter than that of the
pion. However, this is generally not the case for e,e'pi+ events and
a large fraction of events got discarded
+Apply Cerenkov info to identify electron only in those events where
timing information was insufficient to clearly identify the electron
(which was the case in only 2% of the good events).
+This means that most good events for which Cerenkov would have been
inefficient are recovered by timing-based pid
+Total number of e,e'pi+ events now in agreement with Aki's analysis,
ca. 45k
+No kinematic corrections applied: Missing mass only 8 MeV off
+Double asymmetries: versus W, all Q2 in one bin:
+Yuan's and Aki's asymmetries in agreement within 1 sigma or
10-20%. However: these data are 100% correlated (identical). So:
what's the reason: compare runlist, recrunch version, charge in each
spin state, yield in each bin, ...
+Slight disagreement between data and MC
+Q2 vs W acceptance shows a hole in MC at Q2~0.16-0.18, likewise
theta_e ~39-42 degrees
+Q2 dependence: choose 3-4 Q2 bins, 7-8 instead of 15 W-bins
+Waiting for final hPz from ep elastic
+Spin angle profile in MC?
+Implementation of DMT and Sato-Lee: Chi provided skeleton in DGen
+Extract polarized response functions RT',TL' etc.
+Vary SMR=Re(S1+/M1+), EMR=Re(E1+/M1+) in MC, study sensitivity of
T', TL' and extract deformation parameter
+Analysis of pi0 channel
Best regards,
Michael
+-------------------------------------+--------------------------+
| Office: | Home: |
|-------------------------------------|--------------------------|
| Dr. Michael Kohl | Michael Kohl |
| Laboratory for Nuclear Science | 5 Ibbetson Street |
| MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
| Middleton, MA 01949 | U.S.A. |
| U.S.A. | |
| - - - - - - - - - - - - | - - - - - - - - -|
| Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
| Work: +1-617-253-9207 | Home: +1-617-629-3147 |
| Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
| http://blast.lns.mit.edu | |
+-------------------------------------+--------------------------+
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