Just a quick clarification, the parameterization we need is of
MASCARAD on compared to MASCARAD off for the electron ??
I don't understand what is meant by "tossed momenta"
-eugene
Quoting Michael Kohl <kohlm@mit.edu>:
> Hi,
>
> here are the minutes:
>
> -Assessment of v3_4_17 recrunch
> v3_4_17 lrd recrunch done for hydrogen and deuterium 2005
> Difference to v3_4_16 has been the extended magnetic field map.
> -Adrian showed plots of kinematic offsets that indicate consistency
> between small and large grid result.
> -The observed offsets of th_p-th_p(th_e) and p_e-p_e(th_e) cannot be
> simultaneously accounted for by an offset of th_e (would need
> different signs for such an angle offset)
> -Adrian's plots of z: blue=pleft, magenta=corresponding eright;
> red=pright, green=corresponding eleft. Red/green pair consistent
> with
> each other but differs greatly from blue/magenta (which is
> consistent
> with each other). Reason was attributed to an inefficiency due to
> losses in the cuts (those were not updated and were still valid for
> the version before the latest geometry changes)
> -Adam showed comparisons of d(e,e'p) data and MC for 2005 deuterium
> of the old crunch v3_4_14 (lrn) from January and v3_4_17 (lrd)
> from today. Plots show electron momentum in the left and right
> sectors (columns) for 0.1<Q2<0.2 and 0.2<Q2<0.3 (plot containing
> "1_3" in the filename) and 0.3<Q2<0.4 and 0.4<Q2<0.5 (plot
> containing "3_5" in the filename). The agreement in the right sector
> has improved considerably. The left sector has been affected only
> little. The MC still shows broader distributions than the data,
> indicating an issue with the resolution. Best agreement was achieved
> for lowest Q2 bin, while the higher bins show discrepancies. In
> general, the momenta of the data are smaller than those of the MC
> which could be partially or potentially explained by radiative
> effects.
> -Chris generated code that calculates derivatives of p,th,ph,z with
> respect to geometrical offsets of r,theta,phi,alpha,beta,gamma of
> the
> chamber locations. With the three chambers in each sector treated as
> a rigid object, there's a total of
> 2 sectors * (3 positions + 3 angles) = 12 parameters that can be
> varied to find the most likely wire chamber geometry in a fit linear
> in the offset parameters. There's a total of 12 constraints from
> imposing elastic kinematics (2 sectors) * (vertex + coplanarity + 3
> independent kinematic relations of momenta and angles +
> time-of-flight relation), therefore the linear fit should have one
> unique solution. (It's actually a linear regression).
> Before imposing elastic kinematics constraints, the average effects
> of energy loss and internal radiation on the momenta have to be
> accounted for first.
> Eugene had parameterized the momentum losses of protons and
> electrons
> by comparing the MoneCarlo momenta with energy loss turned on with
> the tossed momentum, as a function of reconstructed momentum (email
> from March 10). However, internal radiation (MASCARAD) was turned
> off. This should be repeated as also the average momentum of the
> electron due to internal radiation gets shifted as a result of the
> finite resolution. Adrian had shown this in his comparisons of
> radiated and unradiated Montecarlos in the meeting of 2006/03/01.
> Needed are really parameterizations of delta p between (radiated +
> energy loss)-MC and tossed momenta. Eugene, Adrian, this is input
> that Chris needs while working on the procedure to find the optimum
> wire chamber locations and orientations.
>
>
> -Strategy for coming steps / to do list
> The strategy is two-fold: While we (Chris) continue to determine the
> best
> geometry we also have to prepare for the April 6/7 collaboration
> meeting. Therefore:
> +For the current recrunch version v3_4_17, the currently
> corresponding residual kinematic offsets along with separate
> parametrizations for electron radiation loss and proton
> energy+radiation loss have to be determined and suitably
> parameterized and be made available for everybody's use in
> blast_anaware, (with energy/radiation loss separately accounted
> for) (-> Eugene, Adrian). This has a very high priority.
> +v3_4_17 in combination with the above corrections will be the data
> basis for analysis updates that are going to be reviewed on
> April 6/7.
> +I will continue the v3_4_17 recrunch for deuterium 2004 asap.
> By early next week (~03/27) the v3_4_17 recrunch of the entire data
> should be available (hydrogen and 2005-deuterium is available
> already), along with the corrections from above. From
> then on, 10 days will be available to revisit cuts and macros to
> update the analysis results. Cuts can be looked at already from now
> on. In particular, it is desirable to have new estimates for th_d,
> hPz and Pzz by the end of next week (Sunday April 2, 2006), with
> three days left to apply them to the analyses.
> +Chris will determine the optimum wire chamber geometry by early
> next
> week. Hopefully I will be able to crunch the hydrogen data with
> the updated geometry before next Wednesday. If we're satisfied with
> the
> results, plan will then be to perform another recrunch of the
> entire
> dataset and to produce the "residual kinematic corrections" on top.
> +This recrunch will be available by mid-April at the earliest.
> "Final" (presentable and publishable) analysis results are then
> envisioned for end of April.
>
> -Collaboration meeting is on Friday 2006/04/07 09:00 at Bates
> -Extended analysis meeting on Thursday 2006/04/06 09:00 at Bates
> -Next analysis meeting is on Wednesday 2006/03/29 13:30 at Bates
>
>
>
> 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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--------------------------------------------------------------------------
Eugene Geis
PhD Student, Physics Department, ASU
Research Affiliate, MIT-Bates Laboratory of Nuclear Science
eugene.geis@asu.edu
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http://quickreaction.blogspot.com
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