594
Ö. Özdal
analysis are applied to explore excluded regions. The expected and observed upper
limits on the cross section for different W R and ν R mass hypotheses are compared
with the latest CMS results [14] @ L = 35.9 fb −1 and ATLAS results [13] @
L = 36.1 fb −1 , as seen in Fig. 3. Note that we generate our results using the CMS
[14] data, as this is available. The ATLAS analysis, although more recent and at
a slightly higher luminosity, is able to rule out a small subset of parameter points
in the M W R < M ν R region. However they do not share their observed (expected)
cross section results publicly. Because of that, when we extrapolate our results for
slightly higher luminosity in that region, our cross sections are very small, and we
do not obtain any restrictions. Thus, we decided it safer to compare our analysis
with the existing data points provided by CMS, while indicating restrictions from
both experimental analyses on the plots.
In the M ν R < M W R case, we assume that the contribution comes through the
following decay chain:
W R → R →
R → qq
, , = e or μ ,
(10)
while in the M ν R > M W R case, we assume that the contribution comes through the
following decay chain:
W
R → R → R →
, , = e or μ .
(11)
In our analysis, there is no excluded solution in the M ν R > M W R region since
the corresponding cross section in that region is below the experimental limits, as
can be read from the color bars in Fig. 3. This is understood from our previous
analysis, as the production cross section of ν R through W R bosons dominates the
one obtained through the virtual W
R bosons. The top planes of Fig. 3 represent the
results of the exclusion in the two dimensional M W R − M ν R mass plane based on the
scenario where g L = g R , tan β = 0.01, and V L
CKM = V R
CKM , whereas middle and
bottom planes show the same exclusion for the scenario where g L = g R = 0.37,
tan β = 0.5, V L
CKM = V R
CKM , and g L = g R = 0.37, tan β = 0.5, V L
CKM = V R
CKM ,
respectively. For the scenario where g L = g R , tan β = 0.5, and V L
CKM = V R
CKM ,
W R bosons with masses up to 3.7 (3.7) TeV in the ee channel and up to 3.7 (3.9)
TeV in the μμ channel are excluded at 95% CL, for M ν R up to 2.8 (2.9) TeV in the
ee channel, and 3.1 (3.0) TeV in the μμ channel. The 2D exclusion limits are less
stringent in the ee channel, where W R boson masses are excluded up to 3.0 TeV
for ν R masses close to the M W R = M ν R degeneracy line. On the other hand, we
exclude less parameter space in the two dimensional M W R − M ν R mass plane when
g L = g R = 0.37, tan β = 0.5, and V L
CKM = V R
CKM . As seen from the bottom planes
of Fig. 3, W R bosons with masses up to 3.1 (3.3) TeV are excluded at 95% CL, for
M ν R up to 2.1 TeV, in the ee channel whereas W R bosons with masses up to 3.3
(3.4) TeV are excluded at 95% CL, for M ν R up to 2.6 (2.5) TeV in the μμ channel.
Here again, the 2D exclusion limits are less stringent in the ee channel, where W R
boson masses are excluded up to 2.0 TeV for M ν R masses close to the M W R = M ν R
degeneracy line.
Ö. Özdal
analysis are applied to explore excluded regions. The expected and observed upper
limits on the cross section for different W R and ν R mass hypotheses are compared
with the latest CMS results [14] @ L = 35.9 fb −1 and ATLAS results [13] @
L = 36.1 fb −1 , as seen in Fig. 3. Note that we generate our results using the CMS
[14] data, as this is available. The ATLAS analysis, although more recent and at
a slightly higher luminosity, is able to rule out a small subset of parameter points
in the M W R < M ν R region. However they do not share their observed (expected)
cross section results publicly. Because of that, when we extrapolate our results for
slightly higher luminosity in that region, our cross sections are very small, and we
do not obtain any restrictions. Thus, we decided it safer to compare our analysis
with the existing data points provided by CMS, while indicating restrictions from
both experimental analyses on the plots.
In the M ν R < M W R case, we assume that the contribution comes through the
following decay chain:
W R → R →
R → qq
, , = e or μ ,
(10)
while in the M ν R > M W R case, we assume that the contribution comes through the
following decay chain:
W
R → R → R →
, , = e or μ .
(11)
In our analysis, there is no excluded solution in the M ν R > M W R region since
the corresponding cross section in that region is below the experimental limits, as
can be read from the color bars in Fig. 3. This is understood from our previous
analysis, as the production cross section of ν R through W R bosons dominates the
one obtained through the virtual W
R bosons. The top planes of Fig. 3 represent the
results of the exclusion in the two dimensional M W R − M ν R mass plane based on the
scenario where g L = g R , tan β = 0.01, and V L
CKM = V R
CKM , whereas middle and
bottom planes show the same exclusion for the scenario where g L = g R = 0.37,
tan β = 0.5, V L
CKM = V R
CKM , and g L = g R = 0.37, tan β = 0.5, V L
CKM = V R
CKM ,
respectively. For the scenario where g L = g R , tan β = 0.5, and V L
CKM = V R
CKM ,
W R bosons with masses up to 3.7 (3.7) TeV in the ee channel and up to 3.7 (3.9)
TeV in the μμ channel are excluded at 95% CL, for M ν R up to 2.8 (2.9) TeV in the
ee channel, and 3.1 (3.0) TeV in the μμ channel. The 2D exclusion limits are less
stringent in the ee channel, where W R boson masses are excluded up to 3.0 TeV
for ν R masses close to the M W R = M ν R degeneracy line. On the other hand, we
exclude less parameter space in the two dimensional M W R − M ν R mass plane when
g L = g R = 0.37, tan β = 0.5, and V L
CKM = V R
CKM . As seen from the bottom planes
of Fig. 3, W R bosons with masses up to 3.1 (3.3) TeV are excluded at 95% CL, for
M ν R up to 2.1 TeV, in the ee channel whereas W R bosons with masses up to 3.3
(3.4) TeV are excluded at 95% CL, for M ν R up to 2.6 (2.5) TeV in the μμ channel.
Here again, the 2D exclusion limits are less stringent in the ee channel, where W R
boson masses are excluded up to 2.0 TeV for M ν R masses close to the M W R = M ν R
degeneracy line.