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Underlying Event Tunes and Double Parton Scattering

Abstract

Using the Rivet and Professor framework, we construct a new PYTHIA 6 tune using the CTEQ6L1 PDF and two new PYTHIA 8 UE tunes (one using CTEQ6L1 and one using the HERAPDF1.5LO). By simultaneously fitting CDF data from ppbar collisions at 300 GeV, 900 GeV, and 1.96 TeV together with CMS data for pp collisions at 7 TeV, we test the Underlying Event (UE) models and constrain their parameters, allowing for more precise predictions at 13 TeV and 14 TeV. The consistency of these new tunes with measurements of double-parton scattering (DPS) is also investigated.

Figures

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 1. CDF data for ppbar collisions at 300 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 2. CDF data for ppbar collisions at 900 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 3. CDF data for ppbar collisions at 1960 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 4. CMS data for pp collisions at 7000 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 5. CDF data for ppbar collisions at 900 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 8 tune 4C, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 6. CDF data for ppbar collisions at 1960 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 8 tune 4C, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 7. CMS data for pp collisions at 7000 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS MIN (a,c) and TRANS MAX (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 8 tune 4C, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 8. CMS data on the forward energy flow in MB (a) and dijet (b) events, ALICE data and TOTEM data on charged particle pseudorapidity in, respectively, the central (c) and forward (d) region. The data are compared with PYTHIA 6 tune Z2*, PYTHIA 8 Tune 4C, the new PYTHIA 6 tune, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO. Also shows the ratio of the tunes with the data.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d Figure 1 e Figure 1 f

Figure 9. ATLAS data on the charged particle multiplicity Nch (a,b,c) and pT sum (d,e,f) measured in the transverse (a,d), toward (b,e) and away (c,f) regions. The data are compared with PYTHIA 6 tune Z2*, PYTHIA 8 Tune 4C, the new PYTHIA 6 tune, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO. Also shows the ratio of the tunes with the data.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 10. Predictions for pp collisions at 13 TeV for PYTHIA 8 Tune 4C, PYTHIA 6 tune Z2, the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO, and the the new CMS PYTHIA 6 tune: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the “transMIN” (a,c), and the “transMAX” (b,d) regions as defined by the leading charged particle, as a function of pT max. Also shown are the ratios of the new CMS tunes to Tune 4C.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 11. CMS data on the normalized distributions of the correlation observables DeltaS (a,c) and Delta(rel)pT (b,d) measured in the W+dijet channel compared with MADGRAPH (MG) interfaced with PYTHIA 8 Tune 4C, Tune 4C with no MPI, and the new PYTHIA 8 partial tune (overlap only) (a,b) and compared with MG interfaced with the new PYTHIA 8 partial tune (overlap only) and the new full tune (c,d). Also shows the ratio of the tunes with the data.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 12. CMS data on the normalized distributions of the correlation observables DeltaS (a,c) and Delta(rel)pT (b,d) measured in 4-jet production compared with PYTHIA 8 Tune 4C, Tune 4C with no MPI, and the new PYTHIA 8 partial tune (a,b) and compared with the new PYTHIA 8 tune and with MG interfaced with the new full tune (c,d). Also shows the ratio of the tunes with the data.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d Figure 1 e Figure 1 f

Figure 13. ATLAS data on the charged particle multiplicity Nch (a,b,c) and pT sum (d,e,f) measured in the transverse (a,c), toward (b,d) and away (c,e) regions compared with CDPSTS2-4j. Also shows the ratio of the tunes with the data and the uncertainties of the predictions based on the Professor eigentunes.

--++ Appendix

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 14. CDF data for ppbar collisions at 300 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF (a,c) and TRANS AV (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 15. CDF data for ppbar collisions at 900 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF (a,c) and TRANS AV (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 16. CDF data for ppbar collisions at 1960 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF (a,c) and TRANS AV (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b

Figure 17. CMS data for pp collisions at 7000 Gev: charged particle density (a) and pT sum density (b) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF region as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 6 tune Z2*, tune Z2*lep and the new CMS PYTHIA 6 tune.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 18. CDF data for ppbar collisions at 900 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF (a,c) and TRANS AV (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 8 tune 4C, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO.

Figure 1 a Figure 1 b Figure 1 c Figure 1 d

Figure 19. CDF data for ppbar collisions at 1960 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF (a,c) and TRANS AV (b,d) regions as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 8 tune 4C, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO.

Figure 1 a Figure 1 b

Figure 20. CMS data for pp collisions at 7000 Gev: charged particle density (a,b) and pT sum density (c,d) for charged particles with pT > 0.5 GeV and η < 0.8 in the TRANS DIF region as defined by the leading charged particle, as a function of pT max. The data are compared with PYTHIA 8 tune 4C, and the two new CMS PYTHIA 8 tunes using CTEQ6L1 and the HERAPDF1.5LO.

-- PaoloGunnellini - 05 May 2014

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