A data sample of events from proton–proton collisions with two isolated same-sign leptons, missing transverse momentum, and jets is studied in a search for signatures of new physics phenomena by the ...CMS Collaboration at the LHC. The data correspond to an integrated luminosity of 35.9
fb
-
1
, and a center-of-mass energy of 13
TeV
. The properties of the events are consistent with expectations from standard model processes, and no excess yield is observed. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos, squarks, and same-sign top quarks, as well as top-quark associated production of a heavy scalar or pseudoscalar boson decaying to top quarks, and on the standard model production of events with four top quarks. The observed lower mass limits are as high as 1500
GeV
for gluinos, 830
GeV
for bottom squarks. The excluded mass range for heavy (pseudo)scalar bosons is 350–360 (350–410)
GeV
. Additionally, model-independent limits in several topological regions are provided, allowing for further interpretations of the results.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
We present a patient with iron overload, who was initially diagnosed with hereditary haemochromatosis. Family analysis, however, established that the iron overload was secondary to congenital ...sideroblastic anaemia. The patient died of a hepatocellular carcinoma, likely a complication of iron overload, despite phlebotomies. Increased awareness, as well as development of evidence-based clinical guidelines, is required for timely diagnosis and adequate treatment.
A search for pair production of heavy scalar leptoquarks (LQs), each decaying into a top quark and a
τ
lepton, is presented. The search considers final states with an electron or a muon, one or two
τ
...leptons that decayed to hadrons, and additional jets. The data were collected in 2016 in proton–proton collisions at
s
=
13
Te
with the CMS detector at the LHC, and correspond to an integrated luminosity of 35.9
fb
-
1
. No evidence for pair production of LQs is found. Assuming a branching fraction of unity for the decay
LQ
→
t
τ
, upper limits on the production cross section are set as a function of LQ mass, excluding masses below 900
Ge
at 95% confidence level. These results provide the most stringent limits to date on the production of scalar LQs that decay to a top quark and a
τ
lepton.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The production of a
Z
boson, decaying to two charged leptons, in association with jets in proton-proton collisions at a centre-of-mass energy of 13
TeV
is measured. Data recorded with the CMS ...detector at the LHC are used that correspond to an integrated luminosity of 2.19
fb
-1
. The cross section is measured as a function of the jet multiplicity and its dependence on the transverse momentum of the
Z
boson, the jet kinematic variables (transverse momentum and rapidity), the scalar sum of the jet momenta, which quantifies the hadronic activity, and the balance in transverse momentum between the reconstructed jet recoil and the
Z
boson. The measurements are compared with predictions from four different calculations. The first two merge matrix elements with different parton multiplicities in the final state and parton showering, one of which includes one-loop corrections. The third is a fixed-order calculation with next-to-next-to-leading order accuracy for the process with a
Z
boson and one parton in the final state. The fourth combines the fully differential next-to-next-to-leading order calculation of the process with no parton in the final state with next-to-next-to-leading logarithm resummation and parton showering.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Adrenoleukodystrophy (ALD) is an X-linked peroxisomal disorder with classical features, which can be also recognised in a low resource setting. It had been described in various populations across the ...globe, but very few cases have been reported from Africa. In a boy with features of a progressive central nervous system condition and adrenal failure, ABCD1 gene screening was performed based on a clinical history and basic radiological features which were compatible with ALD. A common ABCD1 mutation was identified in this patient, which is the first report of genetically confirmed ALD in Sub-Saharan Africa. ALD is likely under recognised in those areas where there is no neurologist. This genetic confirmation widens geographical distribution of ABCD1-associated disease, and illustrates recognisability of this disorder, even when encountered in a low-resource environment.
Aim
The aim was to define risk factors for postoperative mortality in patients undergoing emergency surgery for obstructing colon cancer (OCC) and to propose a dedicated score.
Method
From 2000 to ...2015, 2325 patients were treated for OCC in French surgical centres by members of the French National Surgical Association. A multivariate analysis was performed for variables with P value ≤ 0.20 in the univariate analysis for 30‐day mortality. Predictive performance was assessed by the area under the receiver operating characteristic curve.
Results
A total of 1983 patients were included. Thirty‐day postoperative mortality was 7%. Multivariate analysis found five significant independent risk factors: age ≥ 75 (P = 0.013), American Society of Anesthesiologists (ASA) score ≥ III (P = 0.027), pulmonary comorbidity (P = 0.0002), right‐sided cancer (P = 0.047) and haemodynamic failure (P < 0.0001). The odds ratio for risk of postoperative death was 3.42 with one factor, 5.80 with two factors, 15.73 with three factors, 29.23 with four factors and 77.25 with five factors. The discriminating capacity in predicting 30‐day postoperative mortality was 0.80.
Conclusion
Thirty‐day postoperative mortality after emergency surgery for OCC is correlated with age, ASA score, pulmonary comorbidity, site of tumour and haemodynamic failure, with a specific score ranging from 0 to 5.
A search for heavy resonances with masses above 1
TeV
, decaying to final states containing a vector boson and a Higgs boson, is presented. The search considers hadronic decays of the vector boson, ...and Higgs boson decays to b quarks. The decay products are highly boosted, and each collimated pair of quarks is reconstructed as a single, massive jet. The analysis is performed using a data sample collected in 2016 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13
TeV
, corresponding to an integrated luminosity of 35.9
fb
-
1
. The data are consistent with the background expectation and are used to place limits on the parameters of a theoretical model with a heavy vector triplet. In the benchmark scenario with mass-degenerate
W
′
and
Z
′
bosons decaying predominantly to pairs of standard model bosons, for the first time heavy resonances for masses as high as 3.3
TeV
are excluded at 95% confidence level, setting the most stringent constraints to date on such states decaying into a vector boson and a Higgs boson.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A search is presented for an excess of events with heavy-flavor quark pairs (
t
t
¯
and
b
b
¯
) and a large imbalance in transverse momentum in data from proton–proton collisions at a center-of-mass ...energy of 13
TeV
. The data correspond to an integrated luminosity of 2.2
fb
-
1
collected with the CMS detector at the CERN LHC. No deviations are observed with respect to standard model predictions. The results are used in the first interpretation of dark matter production in
t
t
¯
and
b
b
¯
final states in a simplified model. This analysis is also the first to perform a statistical combination of searches for dark matter produced with different heavy-flavor final states. The combination provides exclusions that are stronger than those achieved with individual heavy-flavor final states.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
PDF
