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Polarized STAR and PHENIX A_L W

Merged Emanuele Roberto Nocera requested to merge DY_polarized_data into master

Created by: giacomomagni

Implementation of the polarized asymmetries DY data from RHIC.

STAR datasets:

Dataset Obs. Status Comments Correlations Inspire HepData
STAR_WMWP_510GEV STAR_WMWP_510GEV_WM-AL STAR_WMWP_510GEV_WP-AL :white_check_mark: Figure 5 provides the combination with the 2011-2012 data Table1 of the Appendix for 2013 run only, not implemented paper dataset
:x: Included in the combination with 2013 data paper dataset

PHENIX datasets:

Dataset Obs. Status Comments Correlations Inspire HepData
ALA_L
in
W±+ZW^\pm +Z
:x: see below paper dataset
A_L
in
W^\pm +Z
:x: see below paper dataset

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Merged by Emanuele Roberto NoceraEmanuele Roberto Nocera 7 months ago (Jun 27, 2024 9:33am UTC)

Merge details

  • Changes merged into master with fdf2abfe.
  • Deleted the source branch.

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  • requested review from @enocera

  • requested review from @enocera

  • Created by: giacomomagni

    Regarding the Phenix measurement we might have a problem. My understanding is that Phenix has measured

    ALA_L
    in
    W±+ZW^\pm+Z
    process, despite what they say in the paper title. In particular I read from here:

    Figure 3 shows the combined asymmetry for all of the
    PHENIX data sets and published data from STAR [11].
    The two data sets cannot be compared directly, because
    PHENIX measures the asymmetry from W± +Z decays,
    while the STAR result is solely from W± decays. The
    comparison can be made through the curves, which account for the specifics of each measurement.

    So the numbers that are provided in HepData are not exactly for the same quantity measured by Star. You can then see a difference of the predictions for the two processes in Figure 3.

    @Radonirinaunimi , @enocera do we have a code to produce sensible predictions also for Phenix ? Do we neglect this difference and use the usual code? If not, do we want to have them implemented for the future anyway?

  • Created by: Radonirinaunimi

    Unfortunately, we cannot yet use the mcfm-pol to produce predictions for

    ZZ
    boson production. In principle, that should be doable given that the only difference between the W and Z are the beam functions to which expressions are available here (https://arxiv.org/pdf/1704.05457.pdf) for the latter. But I don't think this will be for NNPDFpol2.0 (?)

    That being said, the differences between

    W+ZW+Z
    and
    Z
    seem to be significant for large-pseudorapidities. So maybe we can still use the same codes for
    |\eta| < 0.35
    .

  • Emanuele Roberto Nocera changed title from **Polarized STAR and PHENIX DY datasets ** to **Polarized STAR and PHENIX W^\pm datasets **

    changed title from **Polarized STAR and PHENIX DY datasets ** to **Polarized STAR and PHENIX W^\pm datasets **

  • Emanuele Roberto Nocera changed title from **Polarized STAR and PHENIX W^\pm datasets ** to **Polarized STAR and PHENIX {+
    There was an error rendering this math block. KaTeX parse error: Expected &amp;#39;EOF&amp;#39;, got &amp;#39;}&amp;#39; at position 2: +}̲W^\pm{+
    +} datasets **

    changed title from **Polarized STAR and PHENIX W^\pm datasets ** to **Polarized STAR and PHENIX {++}W^\pm{++} datasets **

  • Emanuele Roberto Nocera changed title from **Polarized STAR and PHENIX {-
    W±W^\pm
    datasets-} ** to **Polarized STAR and PHENIX A_L W **

    changed title from **Polarized STAR and PHENIX {-W^\pm datasets-} ** to **Polarized STAR and PHENIX A_L W **

  • Emanuele Roberto Nocera
  • Emanuele Roberto Nocera
  • Created by: Radonirinaunimi

    Review: Commented

    To allow for these asymmetries to have negative pseudodata.

  • Created by: giacomomagni

    Looking here:

    https://agenda.infn.it/event/38132/contributions/234387/attachments/120751/175847/Trieste-wv.pdf

    It seems that our friends do include the 3 datapoints from PHENIX as well in their

    ALA_L
    (
    W^+
    ) datasets...

  • Created by: Radonirinaunimi

    Looking here:

    https://agenda.infn.it/event/38132/contributions/234387/attachments/120751/175847/Trieste-wv.pdf

    It seems that our friends do include the 3 datapoints from PHENIX as well in their AL (W+) datasets...

    Interesting! I am curious to know how do they do then? Maybe they just don't care about the distinction

    W±W^\pm
    vs
    W^\pm \otimes Z
    ...

  • Created by: Radonirinaunimi

    Review: Approved

  • Merged by: Radonirinaunimi at 2024-06-27 09:33:11 UTC

  • merged manually

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