Search for the standard model Higgs boson in the \hzzlepjet channel with the CMS experiment at LHC

A search for the standard model (SM) Higgs boson decaying into two Z bosons with a subsequent decay into two leptons and two quark jets, H → ZZ → + −q+q−, is presented. The data sample, corresponding to an integrated luminosity of 4.6 fb−1, is collected from proton proton collisions at the centre-of-mass energy of 7 TeV, with the CMS detector at the LHC at CERN, in proton-proton collisions at the centre-of-mass energy of 7 TeV. Discrimination of signal from background events is based on a kinematic selection and exploiting the different angular distribution of signal and background. No evidence for the Higgs boson is found, and upper limits on the Higgs boson production cross section are set between 130 and 600 GeV mass

Laparoscopy for management of nontraumatic acute abdomen

Secţia Chirurgie, Spitalul Municipal de Urgenţă, Moineşti, România, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Laparoscopia în abdomenul acut are atât rol în stabilirea diagnosticului, confirmându-l în situaţiile echivoce, cât şi în orientarea strategiei terapeutice cu avantajele chirurgiei mini-invazive. Material şi metode: Studiul nostru evaluează 873 de cazuri de abdomen acut nontraumatic (exceptând colecistita acută) abordate laparoscopic în perioada 2010-2014, urmarindu-se concordanţa diagnosticului pre- şi postoperator, stabilirea unui diagnostic intraoperator cert, incidenţa intervenţiilor laparoscopice cât şi complicaţiile acestora. Rezultate: Diagnosticul intraoperator a fost de apendicită acută în 653 (75%) de cazuri, urgenţele ginecologice au fost certificate la 146 (17%) de pacienţi (chist ovarian eclatat, sarcina extrauterină, boala inflamatorie pelvină), 52 (6%) de pacienţi au fost diagnosticaţi cu ulcer perforat, 22 de cazuri fiind înregistrate cu alte patologii (pancreatite acute, perforaţii intestinale cu peritonite, diverticul Meckel perforat, infarcte enteromezenterice, peritonita TBC). Incidente şi accidente au fost întâlnite la 56 (6,5%) de pacienţi, au fost înregistrate 33 (3,7%) de conversii, complicaţii postoperatorii fiind înregistrate în 37 (4,2%) de cazuri. Concluzii: Laparoscopia diagnostică este o modalitate optimă diagnostică în cazurile de abdomen acut non-traumatic, fiind salutară în cazurile de apendicită acută, urgenţe ginecologice şi peritonita de etiologie neprecizată cu posibilitatea rezolvării pe această cale a patologiei identificate, în abdomenul acut laparoscopia fiind ultimul mijloc diagnostic şi primul mijloc terapeutic.Aims: Laparoscopy for acute abdomen is important either for diagnostic, when there is uncertainty in establishing the etiology, and also has a therapeutic role with the well known advantages of mini-invasive surgery. Material and methods: Our study evaluates 873 patients of nontraumatic acute abdomen (excepting acute cholecystitis), approached laparoscopically during 2010-2014. The following factors were pursued: the concordance between pre- and postoperative diagnostic, the establishment of a certain intraoperative diagnostic, incidence of laparoscopic interventions and their complications. Results: There were 653 (75%) cases of acute appendicitis, 146 patients with gynecological (ruptured ovarian cyst, ectopic pregnancy, inflammatory pelvic disease), 52 (6%) patients with perforated ulcer, 22 cases with other pathologies (acute pancreatitis, enteral perforations, perforations of Meckel diverticulum, entero-mesenteric infarction, tuberculous peritonitis), confirmed laparoscopically. Incidents and accidents were encountered in 56 (6.5%) cases, there were 33 (3.7%) conversions to open technique and for 37 (4.2%) patients were recorded postoperative complications. Conclusions: Diagnostic laparoscopy is an optimal method of diagnostic confirmation for cases of non-traumatic acute abdomen especially for acute appendicitis, gynecological emergencies and peritonitis of unknown etiology with the possibility of laparoscopic treatment of these pathologies, being also the last option for diagnostic and the first solution for treatment

Conversion in laparoscopic cholecystectomy for acute cholecystitis

Scopul lucrării. Colecistectomia laparoscopică a devenit o operație curentă în practica chirurgicală zilnică și este considerată în prezent un standard de aur, oferind posibilitatea de a rezolva aproape toate litiazele veziculare simptomatice. În anumite cazuri totuși, condițiile tehnice particulare creează riscuri specifice, ce impun conversia la tehnica deschisă.Materiale și metodă. Studiul nostru se întinde pe o perioada de 5 ani, fiind incluși următorii factori: forma anatomopatologică, motivele și rata conversiei, complicațiile postoperatorii și durata medie de spitalizare.Rezultate. În perioada decembrie 2018- decembrie 2022 au fost efectuate 3576 de colecistectomii laparoscopice din care 2848 au fost realizate pentru colecistita acută (79,6%). Din punct de vedere al formelor anatomopatologice au predominat colecistitele acute catarale (52%), urmate de cele flegmonoase (37%) și gangrenoase (11%). Rata conversiei a fost de 5,4% (156 cazuri), cu o tendință constantă la descreștere corelată cu îmbunătățirea experienței echipei chirurgicale. Printre cele mai întâlnite cauze ce au dus la conversie putem enumera: anatomie incertă datorită proceselor inflamatorii importante (62 de pacienți), fibroza la nivelul triunghiului Calot (43 de cazuri), dar și alte cauze (hemoragie, ciroză hepatică, sindrom aderențial – 51 de cazuri ). La pacienții la care s-a realizat conversia, complicațiile postoperatorii au fost întâlnite în 18% din cazuri, durata medie de spitalizare a fost de 13 zile, cu o mortalitate de 1,28%.Concluzii. Conversia în colecistectomia laparoscopică pentru colecistita acută reprezintă o dovadă a maturității chirurgicale şi nu trebuie considerată un eșec al tehnicii laparoscopice, fiind salutată în situații în care avantajul abordului laparoscopic este depăsit de riscurile unor situații întâlnite în practică.Aim of study. Laparoscopic cholecystectomy is now the “gold standard” operation for patients with gallstones disease. However, a number of patients require conversion to open cholecystectomy for the safe completion of the procedure, generally being certified that untransparency in operative field, unclear anatomical proportion , are the most frequent causes of conversion and postoperative complications.Materials and methods. From 3576 patients who underwent laparoscopic cholecystectomy between 2018-2022, we selected a lot of 2848 cases of acute cholecystitis and evaluated the conversion rate encountered. The patients were selected according to the morphopatological form of cholecystitis as: catarrhal cholecystitis – 52% (1436 cases), phlegmonous cholecystitis - 37% (1275 cases) and gangrenous cholecystitis – 11% (896 cases). The conversion rate was 5,4% (156 cases) Results. In this paper the modalities, the technical particularities and the causes that can lead to conversion in laparoscopic cholecystectomy for acute cholecystitis are discussed.Conclusions. Laparoscopic cholecystectomies can be safely performed for almost all patients with acute cholecystitis by an experienced surgical team, although unclear anatomy secondary to inflammation remains the most common reason for conversion leading to higher rate of postoperative complications and a longer hospital stay, the overall impact of acute cholecystitis on the operative outcome has decreased with time

Measurement of diffraction dissociation cross sections in pp collisions at s\sqrt{s} = 7 TeV

Measurements of diffractive dissociation cross sections in pp collisions at s√=7  TeV are presented in kinematic regions defined by the masses MX and MY of the two final-state hadronic systems separated by the largest rapidity gap in the event. Differential cross sections are measured as a function of ξX=M2X/s in the region −5.53, log10MX>1.1, and log10MY>1.1, a region dominated by DD. The cross sections integrated over these regions are found to be, respectively, 2.99±0.02(stat)+0.32−0.29(syst)  mb, 1.18±0.02(stat)±0.13(syst)  mb, and 0.58±0.01(stat)+0.13−0.11(syst)  mb, and are used to extract extrapolated total SD and DD cross sections. In addition, the inclusive differential cross section, dσ/dΔηF, for events with a pseudorapidity gap adjacent to the edge of the detector, is measured over ΔηF=8.4 units of pseudorapidity. The results are compared to those of other experiments and to theoretical predictions and found compatible with slowly rising diffractive cross sections as a function of center-of-mass energy

Search for a pseudoscalar boson decaying into a ZZ boson and the 125 GeV Higgs boson in ℓ+ℓ−bbˉb\bar{b} final states

Results are reported on a search for decays of a pseudoscalar A boson into a $Z$ boson and a light scalar h boson, where the Z boson decays into a pair of oppositely-charged electrons or muons, and the h boson decays into $b\bar{b}$. The search is based on data from proton–proton collisions at a center-of-mass energy $\sqrt{s}$=8 TeV collected with the CMS detector, corresponding to an integrated luminosity of 19.7 $fb^{−1}$ . The h boson is assumed to be the standard model-like Higgs boson with a mass of 125 GeV. With no evidence for signal, upper limits are obtained on the product of the production cross section and the branching fraction of the A boson in the Zh channel. Results are also interpreted in the context of two Higgs doublet models

Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV

A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270-440 GeV range is excluded at 95% confidence level.Comment: Submitted to JHE