CMS-PAS-EXO-17-019

CMS-PAS-EXO-17-019
Search for narrow H-gamma resonances in proton-proton collisions at sqrt(s) = 13 TeV
CMS Collaboration
June 2018

Abstract: A search for heavy, narrow-width resonances decaying to a Higgs boson and a photon has been performed in proton-proton collision data corresponding to an integrated luminosity of 35.9 inverse femtobarns, collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV in 2016. Events in which a photon and a Lorentz-boosted Higgs boson that decays hadronically and reconstructed as a single, large-radius jet are considered, and the photon+jet invariant mass spectrum is analyzed to look for the presence of narrow-width resonances. To increase the sensitivity of the search, events are categorized depending on whether the large-radius jet is consistent with originating from merging of two b quarks. Results in both categories are found to agree with the predictions of the standard model. Upper limits on the production of Higgs+photon resonances are set as a function of resonance mass in the range of 720-3250 GeV, representing the most stringent limits to date.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, PRL 122 (2019) 081804. The superseded preliminary plots can be found here.

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Signal acceptance times efficiency (${\cal A}\epsilon $) after the final selection, shown for the b-tagged and untagged categories.
png pdf	Figure 2: The observed ${\mathrm {J} {\gamma}}$ invariant mass spectra in the signal region, shown along with the background fit and a few selected signals (arbitrary nomralization), for the b-tagged (left) and untagged (right) categories. The green and yellow bands correspond to the one and two standard deviation uncertainties in the background fit. Shown in the lower panels are the numbers of events in data divided by the predicted number of events from the nominal background fit, with the error bars corresponding to the statistical uncertainty of data and the shaded band to one standard deviation in the background fit.
png pdf	Figure 2-a: The observed ${\mathrm {J} {\gamma}}$ invariant mass spectra in the signal region, shown along with the background fit and a few selected signals (arbitrary nomralization), for the b-tagged (left) and untagged (right) categories. The green and yellow bands correspond to the one and two standard deviation uncertainties in the background fit. Shown in the lower panels are the numbers of events in data divided by the predicted number of events from the nominal background fit, with the error bars corresponding to the statistical uncertainty of data and the shaded band to one standard deviation in the background fit.
png pdf	Figure 2-b: The observed ${\mathrm {J} {\gamma}}$ invariant mass spectra in the signal region, shown along with the background fit and a few selected signals (arbitrary nomralization), for the b-tagged (left) and untagged (right) categories. The green and yellow bands correspond to the one and two standard deviation uncertainties in the background fit. Shown in the lower panels are the numbers of events in data divided by the predicted number of events from the nominal background fit, with the error bars corresponding to the statistical uncertainty of data and the shaded band to one standard deviation in the background fit.
png pdf	Figure 3: Upper limits at 95% CL on signal cross section times branching fraction to ${{\mathrm {H}} {\gamma}}$ for the b-tagged (upper left), untagged (upper right), and statistical combination of the two (lower) channels. The background-only hypothesis is consistent with the observed limits within two sigma.
png pdf	Figure 3-a: Upper limits at 95% CL on signal cross section times branching fraction to ${{\mathrm {H}} {\gamma}}$ for the b-tagged (upper left), untagged (upper right), and statistical combination of the two (lower) channels. The background-only hypothesis is consistent with the observed limits within two sigma.
png pdf	Figure 3-b: Upper limits at 95% CL on signal cross section times branching fraction to ${{\mathrm {H}} {\gamma}}$ for the b-tagged (upper left), untagged (upper right), and statistical combination of the two (lower) channels. The background-only hypothesis is consistent with the observed limits within two sigma.
png pdf	Figure 3-c: Upper limits at 95% CL on signal cross section times branching fraction to ${{\mathrm {H}} {\gamma}}$ for the b-tagged (upper left), untagged (upper right), and statistical combination of the two (lower) channels. The background-only hypothesis is consistent with the observed limits within two sigma.

Tables
png pdf	Table 1: Final selection requirements.

Summary

References
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