Polarized STAR and PHENIX A_L W
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 | ![]() |
Figure 5 provides the combination with the 2011-2012 data | Table1 of the Appendix for 2013 run only, not implemented | paper | dataset |
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Included in the combination with 2013 data | paper | dataset |
PHENIX datasets:
Dataset | Obs. | Status | Comments | Correlations | Inspire | HepData |
---|---|---|---|---|---|---|
in |
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see below | paper | dataset | ||
A_L in W^\pm +Z
|
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see below | paper | dataset |
Merge request reports
Activity
added data toolchain label
requested review from @enocera
assigned to @enocera
requested review from @enocera
added Polarised label
Created by: giacomomagni
Regarding the Phenix measurement we might have a problem. My understanding is that Phenix has measured
inprocess, 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
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
andZseem to be significant for large-pseudorapidities. So maybe we can still use the same codes for|\eta| < 0.35.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
(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
vsW^\pm \otimes Z...