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  Randall–Sundrum graviton and experimental bounds

+ 1 like - 0 dislike

1. What is the physical property and math equation description of Randall–Sundrum graviton? How is this **Randall–Sundrum (RS) graviton** differed from the usual **spin-2 hypothetical massless graviton?** Is that RS graviton just a name for the same graviton in a curved AdS space?

2. What are the experimental bounds, support or contradiction on the test of RS graviton thus far?


Info that I found:

a. In August 2016, experimental results from the LHC excluded RS gravitons with masses below 3.85 and 4.45 TeV for ˜k = 0.1 and 0.2 respectively and for ˜k = 0.01, graviton masses below 1.95 TeV, except for the region between 1.75 TeV and 1.85 TeV. Currently, the most stringent limits on RS graviton production. [See here](https://en.wikipedia.org/wiki/Randall%E2%80%93Sundrum_model#Experimental_results).

b. a search for resonant production of high mass photon pairs. The search
employs 12.9 fb−1 of pp collision data collected by the CMS experiment in 2016 at a
centre-of-mass energy of 13 TeV. It is aimed at spin-0 and spin-2 resonances of mass
between 0.5 and 4.5 TeV and width, relative to the mass, up to 5.6 × 10−2. The results of the search are combined statistically with those previously obtained by the CMS collaboration at √s = 8 and 13 TeV. Limits are set on scalar resonances produced through gluon-gluon fusion, and on Randall–Sundrum gravitons. No significant excess is observed over the standard model predictions. [See here](https://cds.cern.ch/record/2205245/files/EXO-16-027-pas.pdf)

Unfortunately, I do not get what it means above to say "except for the region between 1.75 TeV and 1.85 TeV." If you can offer some interpretations of the above results, it will be priceless to me!

asked Apr 14, 2021 in Theoretical Physics by wonderich (1,455 points) [ revision history ]

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