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Measurement E179M16

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Experiment: SIDIS Dihadron Beam Spin Asymmetry, 2020

Spokespersons: C. Dilks, T. Hayward, A. Vossen

Experiment comment:
Process: ep→eπ+π-X
Data tables have the following columns:

  1. mean Q2
  2. mean x
  3. mean Mh, the dihadron invariant mass
  4. mean z, of the pion pair
  5. mean PT, more commonly written Ph, is the component of the total dihadron momentum, transverse to q
  6. ALU amplitude, for a particular modulation
  7. statistical uncertainty
  8. systematic uncertainty
For each of the 7 asymmetry modulations, there are 4 tables, one for each binning scheme: (1) binned by x, (2) binned by Mh, (3) binned by z and Mh, and (4) binned by PT and Mh.

Measurement comment: Binning scheme: bins of PT, for Mh below and above 0.63 GeV

Publication:

Quantity measured: ALUsin (2φhφR),
Beam spin asymmetry sin(2φhφR) moment
Beam: e, polarization: longitudinal
Target: p (Z=1, A=1), polarization: none
Final state: π π + X, polarization: none

Q2 : 1 — 10.6 GeV2
W : 2 — 4 GeV
xb : 0.06 — 0.77
Ebeam : 10.6041 GeV

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Click here to get data in text file, delimited with tabs.

Measured data:

Q2,
GeV2
x M(π+),
GeV
z PT,
GeV
ALUsin (2φhφR) Data errors Systematic errors
3.534 0.309 0.501 0.591 0.169 0.0119641 0.00929926 0.00112912752822237
3.429 0.284 0.493 0.568 0.311 -0.0069775 0.00885382 0.00210464234362806
3.221 0.259 0.481 0.553 0.426 0.00841837 0.00791197 0.00111633517525679
3.123 0.244 0.474 0.541 0.533 0.00645107 0.00743461 0.000593191636870149
3.027 0.231 0.464 0.532 0.653 -0.00808863 0.00622936 0.00119201844721155
2.759 0.204 0.454 0.531 0.864 -0.00813169 0.00488579 0.00059034487496621
2.897 0.226 0.946 0.56 0.16 -0.000679581 0.00454374 0.000355601079716604
2.865 0.221 0.915 0.566 0.306 -0.00864188 0.00498138 0.00108591581576447
2.837 0.217 0.894 0.57 0.422 0.00088889 0.00546824 0.00193810035697358
2.752 0.207 0.876 0.57 0.53 -0.0258545 0.00665779 0.00323050017561236
2.677 0.199 0.858 0.574 0.648 -0.00920303 0.00561535 0.00191950978156441
2.528 0.182 0.832 0.586 0.852 -0.0283835 0.00873555 0.00190544030508124