PhysicsResultsFSQ12005 < CMSPublic

---+!! Measurement of pp diffraction dissociation cross sections at &#8730;s = 7 TeV at the LHC

---++ Abstract

We present results from a measurement of the single and double diffraction dissociation cross sections in pp collisions at &#8730;s = 7 TeV using the Compact Muon Solenoid detector at the Large Hadron Collider, and compare our results to other experimental measurements and to theoretical expectations. In addition, the differantial cross section of forward rapidity gaps (d&sigma;/d&Delta;&eta;<sup>F</sup>) at &#8730;s = 7 TeV pp collisions is presented. 

---++ Figures part1

%TABLE{ datavalign="middle" }%
| *Figure * | *Caption* |
|[[%ATTACHURL%/Fig3.pdf][<img src="%ATTACHURL%/Fig3.png" alt="click on it to get it" width=300/>]]  | The (a) $\eta_{max}$, (b) $\eta_{min}$ and (c) $\Delta\eta^{0} = \eta^{0}_{max}-\eta^{0}_{min}$ distributions for the minimum-bias sample, compared to predictions of the PYTHIA8-MBR simulation normalized to the luminosity of the data. Contributions from each of the generated processes are shown separately. The DD MC events are additionally scaled downwards by 15~$\%$. The dashed vertical lines represent the $\eta_{max}<1$, $\eta_{min}>-1$ and  $\Delta\eta^{0}>3$ selections.|
|[[%ATTACHURL%/Fig4a.pdf][<img src="%ATTACHURL%/Fig4a.png" alt="click on it to get it" width=150/>]]  | The generator-level distributions of the dissociated mass, $M_X$, for the SD process in the SD1 sample at different selection stages for the PYTHIA8-MBR MC sample |
|[[%ATTACHURL%/Fig4b.pdf][<img src="%ATTACHURL%/Fig4b.png" alt="click on it to get it" width=150/>]]  | The generator-level distributions of the dissociated mass, $M_X$, for the SD process in the SD1 sample at different selection stages for the PYTHIA8-4C MC sample |
|[[%ATTACHURL%/Fig5.pdf][<img src="%ATTACHURL%/Fig5.png" alt="click on it to get it" width=300/>]]  | The generator-level efficiency (PYTHIA8-MBR), in the $M_X$ and $M_Y$ plane, for selecting truly DD events after (a) the trigger selection and (b) the SD2 or (c) the DD selections |
|[[%ATTACHURL%/Fig6.pdf][<img src="%ATTACHURL%/Fig6.png" alt="click on it to get it" width=300/>]]  | The detector-level distributions of the reconstructed and corrected $\xi$ for (a) the entire SD2 sample, and the SD2 subsamples with (b) no CASTOR tag and (c) a CASTOR tag. The data are compared to predictions of the PYTHIA8-MBR simulation normalized to the luminosity of the data. Contributions for each one of the generated processes are shown separately. The DD MC events are additionally scaled downwards by 15~$\%$.|
|[[%ATTACHURL%/Fig7.pdf][<img src="%ATTACHURL%/Fig7.png" alt="click on it to get it" width=300/>]]  | The detector-level distributions of the reconstructed and corrected $\xi$ for (a) the entire SD2 sample, and the SD2 subsamples with (b) no CASTOR tag and (c) a CASTOR tag. The data are compared to predictions of the PYTHIA8-4C simulation normalized to the luminosity of the data. Contributions for each one of the generated processes are shown separately.|
|[[%ATTACHURL%/Fig8.pdf][<img src="%ATTACHURL%/Fig8.png" alt="click on it to get it" width=300/>]]  | The SD (left) and DD (right) cross sections as a function of $\xi$ compared to PYTHIA6, PYTHIA8-4C and PYTHIA8-MBR MC predictions.|
|[[%ATTACHURL%/Fig9a.pdf][<img src="%ATTACHURL%/Fig9a.png" alt="click on it to get it" width=150/>]]  | The detector-level distributions of the reconstructed and corrected $\Delta\eta^{0}$ for the DD sample with central LRG. The data are compared to predictions of the PYTHIA8-MBR simulation normalized to the luminosity of the data. Contributions for each one of the generated processes are shown separately. The DD events in PYTHIA8-MBR sample are scaled downwards by 15~$\%$.|
|[[%ATTACHURL%/Fig9b.pdf][<img src="%ATTACHURL%/Fig9b.png" alt="click on it to get it" width=150/>]]  | The detector-level distributions of the reconstructed and corrected $\Delta\eta^{0}$ for the DD sample with central LRG. The data are compared to predictions of the PYTHIA8-4C simulation normalized to the luminosity of the data. Contributions for each one of the generated processes are shown separately.|
|[[%ATTACHURL%/Fig10.pdf][<img src="%ATTACHURL%/Fig10.png" alt="click on it to get it" width=150/>]]  | The DD cross sections as a function of $\Delta\eta$ compared to PYTHIA6, PYTHIA8-4C and PYTHIA8-MBR MC predictions.|

---++ Figures part2 

|  [[%ATTACHURLPATH%/Fig12a.pdf][<img alt="Figure 12 left" src="%ATTACHURLPATH%/Fig12a.png" height="320" />]]  |  [[%ATTACHURLPATH%/Fig12b.pdf][<img alt="Figure 12 right" src="%ATTACHURLPATH%/Fig12b.png" height="320" />]]  |
| *Figure 12.* (a) Comparison of uncorrected forward rapidity gap size (&#8710;&#951;F) distribution (black points) with the different MC models (colored lines), (b) Beam background from unpaired bunches.  ||

|  [[%ATTACHURL%/Fig13.pdf][<img alt="Figure 13" src="%ATTACHURL%/Fig13.png" height="340" />]]  |
| *Figure 13.* Single side BSC trigger efficiency for at least two hits (offline) in either side of the BSC. The trigger efficiency correction factors are obtained from a fit to the data. The discrepancy between the fit and the data points has a small effect on the results and is covered by the systematics. |

|  [[%ATTACHURL%/Fig14.pdf][<img alt="Figure 14" src="%ATTACHURL%/Fig14.png" height="340" />]]  |
| *Figure 14.* Migration matrix between the truth and reconstructed &#8710;&#951;F according to PYTHIA8-MBR (&#949; = 0.08) for stable final state particles with pT > 200 MeV in &Iota;&#951;&Iota; < 4.7. The plot is normalized to the unity in columns. |

| [[%ATTACHURL%/Fig15a.pdf][<img alt="Figure 15 upper left" src="%ATTACHURL%/Fig15a.png" height="340" />]]  |  [[%ATTACHURL%/Fig15b.pdf][<img alt="Figure 15 upper right" src="%ATTACHURL%/Fig15b.png" height="340" />]]  | 
| [[%ATTACHURL%/Fig15c.pdf][<img alt="Figure 15 lower left" src="%ATTACHURL%/Fig15c.png" height="340" />]]  |  [[%ATTACHURL%/Fig15d.pdf][<img alt="Figure 15 lower right" src="%ATTACHURL%/Fig15d.png" height="340" />]]  |
| *Figure 15.* Unfolded and fully corrected differantial cross section of the forward rapidity gap size (d&#963;/d&#8710;&#951;F) for all stable final particles with pT > 200 MeV in &Iota;&#951;&Iota; < 4.7 are compared with the hadron level predictions of (a) PYTHIA8-MBR (&#949; = 0.08), (b) PYTHIA8-MBR (&#949; = 0.104), (c) PYTHIA8 tune 4C and (d) PYTHIA6 tune Z2star. The green band represents the total systematic uncertainty on the measurement which is obtained as the quadrature sum of the different uncertainty sources. ||

|  [[%ATTACHURL%/Fig16.pdf][<img alt="Figure 16" src="%ATTACHURL%/Fig16.png" height="340" />]]  |
| *Figure 16.* Comparison of CMS measurement (black points) with ATLAS result (blue points). The green band respresents the total systematic uncertainty of the CMS measurement and the total uncertainty of ATLAS measurement is shown with the error bars on the ATLAS points. The hadron level definitions of the two measurements are not the same. CMS measures the forward rapidity gap size in &#951; starting from &#951; = ±4.7 where the ATLAS limit is &#951; = ±4.9. |

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
pdf	Fig10.pdf	r1	manage	14.9 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig10.png	r1	manage	57.4 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig12a.pdf	r1	manage	56.4 K	2013-04-22 - 01:24	SercanSen
png	Fig12a.png	r1	manage	57.4 K	2013-04-22 - 01:25	SercanSen
pdf	Fig12b.pdf	r1	manage	38.8 K	2013-04-22 - 01:25	SercanSen
png	Fig12b.png	r1	manage	31.9 K	2013-04-22 - 01:25	SercanSen
pdf	Fig13.pdf	r1	manage	25.8 K	2013-04-22 - 01:26	SercanSen
png	Fig13.png	r1	manage	17.0 K	2013-04-22 - 01:26	SercanSen
pdf	Fig14.pdf	r1	manage	75.6 K	2013-04-22 - 01:26	SercanSen
png	Fig14.png	r1	manage	70.7 K	2013-04-22 - 01:27	SercanSen
pdf	Fig15a.pdf	r1	manage	35.9 K	2013-04-22 - 01:27	SercanSen
png	Fig15a.png	r1	manage	100.1 K	2013-04-22 - 01:27	SercanSen
pdf	Fig15b.pdf	r1	manage	35.8 K	2013-04-22 - 01:28	SercanSen
png	Fig15b.png	r1	manage	99.4 K	2013-04-22 - 01:28	SercanSen
pdf	Fig15c.pdf	r1	manage	32.7 K	2013-04-22 - 01:28	SercanSen
png	Fig15c.png	r1	manage	88.9 K	2013-04-22 - 01:29	SercanSen
pdf	Fig15d.pdf	r1	manage	33.2 K	2013-04-22 - 01:29	SercanSen
png	Fig15d.png	r1	manage	93.3 K	2013-04-22 - 01:30	SercanSen
pdf	Fig16.pdf	r1	manage	24.3 K	2013-04-22 - 01:30	SercanSen
png	Fig16.png	r1	manage	71.7 K	2013-04-22 - 01:30	SercanSen
pdf	Fig3.pdf	r1	manage	36.7 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig3.png	r1	manage	44.1 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig4a.pdf	r1	manage	15.6 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig4a.png	r1	manage	49.6 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig4b.pdf	r1	manage	15.7 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig4b.png	r1	manage	49.8 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig5.pdf	r1	manage	48.8 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig5.png	r1	manage	70.0 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig6.pdf	r1	manage	19.5 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig6.png	r1	manage	26.2 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig7.pdf	r1	manage	19.3 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig7.png	r1	manage	24.7 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig8.pdf	r1	manage	17.8 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig8.png	r1	manage	41.0 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig9a.pdf	r1	manage	14.5 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig9a.png	r1	manage	33.6 K	2013-04-21 - 04:57	RobertCiesielski
pdf	Fig9b.pdf	r1	manage	14.5 K	2013-04-21 - 04:56	RobertCiesielski
png	Fig9b.png	r1	manage	33.1 K	2013-04-21 - 04:57	RobertCiesielski

This topic: CMSPublic > WebPreferences > PhysicsResultsFSQ12005
Topic revision: r19 - 2013-04-22 - SercanSen

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