Paper Proposal: Run 9 pp200 Forward Di-jet Asymmetry
Title: Longitudinal Double-Spin Asymmetries for Di-jet Production at intermediate pseudorapidity in Polarized $pp$ Collisions at $\sqrt{s}$ = 200 GeV
PA: Ting Lin, Scott Wissink, Brian Page
Target Journal: Physical Review D Regular Articles
Abstract: We present the first measurement of longitudinal double-spin asymmetries $A_{LL}$ for di-jets within the intermediate pseudorapidity range $0.8 < \eta < 1.8$. The di-jets are produced in polarized $pp$ collisions at a center-of-mass energy $\sqrt{s}$ = 200 GeV. Values for $A_{LL}$ are determined for several distinct event topologies, defined by the jet pseudorapidities, and span a range of Bjorken-x down to $x$ ≈ 0.01, a regime where the gluon helicity distribution $\Delta g(x)$ is poorly constrained. The measured asymmetries are found to be consistent with the predictions of global analyses that incorporate the results of previous STAR measurements.
Paper Draft:
1. Introduction and Motivation
2. Experiment: STAR @ RHIC, detector subsystems
3. Data and Simulation
3.1 Data sets, QA
3.2 Simulation / embedding details
4. Jet and Di-jet
4.1 Jet reconstruction, underlying event
4.2 Di-jet event selection
5. Experimental methods
5.1 Challenges in the forward (EEMC) region
5.2 Machine Learning approaches and corrections
5.3 Biases and systematic error estimate
6. Double spin asymmetries
6.1 Final results
6.2 Comparison to theory, prior results
7. Conclusions
Analysis Note:
Proposed Figure:
Figure 1:Jet Pt, Eta, Phi
Figure 2: Jet Rt
Figure 3: Dijets Mass, Delta-Eta, Delta-Phi
Figure 4: UE delta Mass:
Figure 5: Endcap Jet Pt corrections
Figure 6: Dijet Pt imbalance
Figure 7:
Figure 8: Di-jet kinematic, Figure 9: Di-jet double spin asymmetry.
Back Up:
Preliminary Result Request Talk to Spin PWG
Recent Update to Final Results
PA: Ting Lin, Scott Wissink, Brian Page
Target Journal: Physical Review D Regular Articles
Abstract: We present the first measurement of longitudinal double-spin asymmetries $A_{LL}$ for di-jets within the intermediate pseudorapidity range $0.8 < \eta < 1.8$. The di-jets are produced in polarized $pp$ collisions at a center-of-mass energy $\sqrt{s}$ = 200 GeV. Values for $A_{LL}$ are determined for several distinct event topologies, defined by the jet pseudorapidities, and span a range of Bjorken-x down to $x$ ≈ 0.01, a regime where the gluon helicity distribution $\Delta g(x)$ is poorly constrained. The measured asymmetries are found to be consistent with the predictions of global analyses that incorporate the results of previous STAR measurements.
Paper Draft:
- Paper Draft 2018-01-21
- Paper Draft 2018-03-05
- Paper Draft 2018-03-25 (Draft for Institutional Review)
- Paper Draft 2018-05-10 (Draft incorporating comments from institutional reviews.) (Comments from Institutional Review and our answers: here)
- Paper Draft 2018-07-05 (Draft with the suggestions from PRD Referee, comments from referee and our reply: here)
1. Introduction and Motivation
2. Experiment: STAR @ RHIC, detector subsystems
3. Data and Simulation
3.1 Data sets, QA
3.2 Simulation / embedding details
4. Jet and Di-jet
4.1 Jet reconstruction, underlying event
4.2 Di-jet event selection
5. Experimental methods
5.1 Challenges in the forward (EEMC) region
5.2 Machine Learning approaches and corrections
5.3 Biases and systematic error estimate
6. Double spin asymmetries
6.1 Final results
6.2 Comparison to theory, prior results
7. Conclusions
Analysis Note:
- Analysis Note 2017-05-22
- Analysis Note 2018-01-03
- Analysis Note 2018-03-09
- Analysis Note 2018-05-11 (Add correlation matrix in appendix A)
- $CVS/offline/paper/PSN0686
Proposed Figure:
Figure 1:Jet Pt, Eta, Phi
Figure 2: Jet Rt
Figure 3: Dijets Mass, Delta-Eta, Delta-Phi
Figure 4: UE delta Mass:
Figure 5: Endcap Jet Pt corrections
Figure 6: Dijet Pt imbalance
Figure 7:
Figure 8: Di-jet kinematic, Figure 9: Di-jet double spin asymmetry.
Back Up:
Preliminary Result Request Talk to Spin PWG
Recent Update to Final Results
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