Adding a vertex smearing configution for pp at 5 TeV #12047

mandrenguyen · 2015-10-22T12:48:54Z

Expected beam conditions for the pp run at 5 TeV that will take place in about 4 weeks.
71X version of #12040

cmsbuild · 2015-10-22T12:51:21Z

A new Pull Request was created by @mandrenguyen for CMSSW_7_1_X.

Adding a vertex smearing configution for pp at 5 TeV

It involves the following packages:

Configuration/StandardSequences
IOMC/EventVertexGenerators

@cmsbuild, @civanch, @franzoni, @mdhildreth, @davidlange6 can you please review it and eventually sign? Thanks.
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civanch · 2015-10-22T13:14:36Z

please test

cmsbuild · 2015-10-22T13:16:09Z

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/9132/console

cmsbuild · 2015-10-22T14:22:15Z

+1
Tested at: c9c2958
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12047/9132/summary.html

mmusich · 2015-10-22T15:10:31Z

@diguida @jrcastle

diguida · 2015-10-22T15:42:16Z

@mmusich thanks for the ping. I saw the 71X version reported by @mandrenguyen in his mail.

diguida · 2015-10-22T17:08:11Z

@mandrenguyen I am not convinced about the centroid position. From the first pp fills, we know that X and Y are not in 0. The latest exercise was done on Run2015B collision (fill 4008), and we have

Centroid absolute positions
X =  0.07798 cm
Y =  0.09714 cm
Z = -1.610 cm

BPIX absolute position extracted from PCL-like alignment run after magnet ramp-up:
X = -0.026837  cm
Y = -0.0715252 cm
Z = -0.511453  cm

Vertex smearing parameters
X0 = 0.10482 cm
Y0 = 0.16867 cm
Z0 = -1.0985 cm

Now, we know for sure that, in Run2015D the Z is back in 0, while X and Y are still away.
I'd rather suggest to use the "realistic" values.

If, instead, you have already the GEN-SIM for the NominalHICollision2015VtxSmearingParameters, I can argue you want to keep the same centroid position.

mandrenguyen · 2015-10-22T17:15:00Z

@diguida
Indeed when we set the HI beam position we still thought the beam would be at the origin, and we chose not to stop the GEN-SIM to move the beam beam. You can see we added an improved guess: UpdatedHICollision2015VtxSmearingParameters
but this hasn't been used yet.

Now if you tell me that the beam position is pretty stable and we don't think it will move then I should update the centroid positions accordingly.
Just to be sure, your recommendation is:

Vertex smearing parameters
X0 = 0.10482 cm
Y0 = 0.16867 cm
Z0 = -1.0985 cm

Is that correct?

Thanks!

diguida · 2015-10-22T19:31:46Z

@mandrenguyen
thanks for the feedback on the updated vertex parameters.

The change in Z position happened during Run2015D (with a LHC time shift, more details on BeamSpot hn), while the X and Y position are quite stable in this era, as you can see in the latest report by BeamSpot operation team at the AlCaDB meeting.

Concerning X, do not use the 0T value: the centroid position in x depends on the B field (horizontal crossing angle) and we do see movements ~120 um, confirmed by LHC-OPS team.

I'd suggest some values taken from the latest fills in Run2015D (4393), looking at the plots in the presentation:

X = 0.0760 cm
Y = 0.0935 cm
Z = 0.0 cm

Beware: you should sum algebraically the pixel barycentre of the alignment used to compute that BS, as in the vertex smearing parameters you should refer to the pixels. This is an exercise done within the tracker alignment group. Assuming this is the same as the previous computation (this is typically not the case):

X_p = -0.026837  cm
Y_p = -0.0715252 cm
Z_p = -0.511453  cm

you get:

X0 = 0.1028 cm
Y0 = 0.1650 cm
Z0 = 0.5115 cm

Please do not consider those numbers as correct, but take them as a straw-man example. We can provide you the new pixel barycentre position, if worth.

mandrenguyen · 2015-10-23T08:32:58Z

@diguida I'm slightly confused by your recommendation. Is the suggestion that the tracker alignment group should provide us with a prediction or that we just use the numbers from Run2015D. Specifically, who is qualified to make this call: "We can provide you the new pixel barycentre position, if worth" ?

mmusich · 2015-10-23T12:20:46Z

@mandrenguyen your understanding is correct.
The tracker alignment group should provide you with a best guess, that since we don't have a crystal ball would be the current numbers from Run2015D.
Since @jrcastle is also currently in charge of the pixel alignment in pp right now, he's in an excellent position to derive these numbers.

diguida · 2015-10-23T14:07:30Z

@mandrenguyen @mmusich we have also some numbers for a recent BS computed on top of the new pixel large-structure alignment for its validation: BeamSpotObjects_run258742_v1_promptvalidation. After a quick check, I propose these parameters for the centroid position:

x = 0.0769 cm
y = 0.0936 cm
z = 0.1543 cm

BS experts will cross-check those values, but I am pretty confident...

mandrenguyen · 2015-10-23T17:39:01Z

@mmusich @diguida
We will update shortly.
thank you very much!

mandrenguyen · 2015-10-25T06:52:17Z

@mmusich @diguida @franzoni
The PR has been updated according to the latest recommendation of the centroid from@jrcastle.
The corresponding PRs for the other releases will follow. I append the details of his derivation below.

Beam fit from Salvatore on Run 258742

x = 0.0769 cm
y = 0.0936 cm
z = 0.1543 cm

BPIX and PIXEL locations estimated from a high level alignment to the pixel detector from the same run (x2, y2, z2):

BPIX:

x1 x2: -0.0278442 -0.0275148
y1 y2: -0.0734346 -0.0740016
z1 z2: -0.515565 -0.516435

Delta(x,y,z) = 2-1 = (3.29357,-5.66995,-8.69968) mum

Pixel:

x1 x2: -0.041651 -0.0415103
y1 y2 -0.199279 -0.199526
z1 z2: -0.565093 -0.566091
Delta(x,y,z) = 2-1 = (1.40686,-2.47002,-9.97731) mum
| | treeFile_74X_dataRun2_Express_v3_TrackerAlignment_2009_v1_express_r258742.root || treeFile_74X_dataRun2_Express_v3_testTag_r258742.root||
| Position | BPIX | Full Pixel | BPIX | Full Pixel |
| x | -0.0278442 | -0.041651 | -0.0275148 | -0.0415103 |
| y | -0.0734346 | -0.199279 | -0.0740016 | -0.199526 |
| z | -0.515565 | -0.565093 | -0.516435 | -0.566091 |

Taking the BPIX values as the barycenter, then the values for the smearing parameters are:

x0 = 0.1044 cm
y0 = 0.1676 cm
z0 = 0.6707 cm

cmsbuild · 2015-10-25T06:56:10Z

Pull request #12047 was updated. @cmsbuild, @civanch, @franzoni, @mdhildreth, @davidlange6 can you please check and sign again.

mmusich · 2015-10-26T08:27:36Z

@cmsbuild please test

cmsbuild · 2015-10-26T08:31:13Z

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/9190/console

cmsbuild · 2015-10-26T09:53:09Z

+1
Tested at: 6626fee
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12047/9190/summary.html

cmsbuild · 2015-10-26T10:28:59Z

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12047/9190/summary.html

mandrenguyen · 2015-10-27T07:15:10Z

@civanch Can you sign for simulation, please?

civanch · 2015-10-27T09:13:20Z

+1

davidlange6 · 2015-10-27T16:59:42Z

+1

Adding a vertex smearing configution for pp at 5 TeV

Adding a vertex smearing configution for pp at 5 TeV

c9c2958

cmsbuild added this to the Next CMSSW_7_1_X milestone Oct 22, 2015

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This was referenced Oct 22, 2015

Adding a vertex smearing configution for pp at 5 TeV #12049

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Adding a vertex smearing configution for pp at 5 TeV #12051

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Update VtxSmearedParameters_cfi.py

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Merge pull request #12047 from mandrenguyen/vtxSmearingPP5TeV71X

13d9668

Adding a vertex smearing configution for pp at 5 TeV

cmsbuild merged commit 13d9668 into cms-sw:CMSSW_7_1_X Oct 27, 2015

mandrenguyen deleted the vtxSmearingPP5TeV71X branch March 4, 2022 10:12

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Adding a vertex smearing configution for pp at 5 TeV #12047

Adding a vertex smearing configution for pp at 5 TeV #12047

mandrenguyen commented Oct 22, 2015

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mmusich commented Oct 22, 2015

diguida commented Oct 22, 2015

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davidlange6 commented Oct 27, 2015

Adding a vertex smearing configution for pp at 5 TeV #12047

Adding a vertex smearing configution for pp at 5 TeV #12047

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mandrenguyen commented Oct 22, 2015

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mmusich commented Oct 22, 2015

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mandrenguyen commented Oct 23, 2015

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diguida commented Oct 23, 2015

mandrenguyen commented Oct 23, 2015

mandrenguyen commented Oct 25, 2015

BPIX and PIXEL locations estimated from a high level alignment to the pixel detector from the same run (x2, y2, z2):

BPIX:

Delta(x,y,z) = 2-1 = (3.29357,-5.66995,-8.69968) mum

Pixel:

cmsbuild commented Oct 25, 2015

mmusich commented Oct 26, 2015

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mandrenguyen commented Oct 27, 2015

civanch commented Oct 27, 2015

davidlange6 commented Oct 27, 2015