LEP Indications for Two Light Higgs Bosons and U(1)' Model

Reanalyses of LEP data have shown preference to two light CP-even Higgs bosons. We discuss implications of such a Higgs boson spectrum for the minimal supersymmetric model extended by a Standard Model singlet chiral superfield and an additional Abelian gauge invariance (the U(1)' model). We, in particular, determine parameter regions that lead to two light CP-even Higgs bosons while satisfying existing bounds on the mass and mixings of the extra vector boson. In these parameter regions, the pseudoscalar Higgs is found to be nearly degenerate in mass with either the lightest or next-to-lightest Higgs boson. Certain parameters of the U(1)' model such as the effective mu parameter are found to be significantly bounded by the LEP two-light-Higgs signal.Comment: 20 pp, 7 figs, 2 table

Wi-Fi tracking : what about privacy

National audienceTracking individuals is a major issue today. Several methods exist, but they are limited you to user interaction. A new way of tracking is based on Wi-Fi which does not need any user cooperation. However this method involves new privacy threats. This paper verify if the existing solutions to protect the privacy are secure enough. The tracking system is based on Wi-Fi sensors installed in different locations to monitor and record packets sent by Wi-Fi-enabled devices. The identification process is possible thanks to the MAC address contained in each packet. However this unique identifier is bound to the user and has to be securely stored. Tracking individuals has plenty of applications. Studying the habit of customers in shop center is a service offered by several new specialized companies. We analyze which kind of protection are used, where and how data are stored. One commonly used protection is the one-way hash function. Studying the MAC1 addresses' distribution leads us to develop an attack. Finally, a test platform is built to validate or not the solutions or think to new ones

Tevatron Higgs Mass Bounds: Projecting U(1)' Models to LHC Domain

We study Higgs boson masses in supersymmetric models with an extra U(1) symmetry to be called U(1)$^{\prime}$. Such extra gauge symmetries are urged by the $\mu$ problem of the MSSM, and they also arise frequently in low-energy supersymmetric models stemming from GUTs and strings. We analyze mass of the lightest Higgs boson and various other particle masses and couplings by taking into account the LEP bounds as well as the recent bounds from Tevatron experiments. We find that the $\mu$-problem motivated generic low-energy U(1)$^{\prime}$ model yields Higgs masses as large as $\sim 200\ {\rm GeV}$ and violate the Tevatron bounds for certain ranges of parameters. We analyze correlations among various model parameters, and determine excluded regions by both scanning the parameter space and by examining certain likely parameter values. We also make educated projections for LHC measurements in light of the Tevatron restrictions on the parameter space. We further analyze certain benchmark models stemming from E(6) breaking, and find that they elevate Higgs boson mass into Tevatron's forbidden band when U(1)$^{\prime}$ gauge coupling takes larger values than the one corresponding to one-step GUT breaking.Comment: 11 pages, 3 figure

Sneutrino Dark Matter: Symmetry Protection and Cosmic Ray Anomalies

We present an R-parity conserving model of sneutrino dark matter within a Higgs-philic U(1)' extension of the minimal supersymmetric standard model. In this theory, the mu parameter and light Dirac neutrino masses are generated naturally upon the breaking of the U(1)' gauge symmetry. The leptonic and hadronic decays of sneutrinos in this model, taken to be the lightest and next-to-lightest superpartners, allow for a natural fit to the recent results reported by the PAMELA experiment.Comment: Revised to match the published version; 11 pages (2 column format), 1 table, 6 figures, to appear in PR

Higgs Boson Masses Of The MSSM With General Soft Breaking

The operators that break supersymmetry can be holomorphic or non-holomorphic in structure. The latter do not pose any problem for gauge hierarchy and are soft provided that the particle spectrum does not contain any gauge singlets. In minimal supersymmetric model (MSSM) we discuss the impact of non-holomorphic soft-breaking terms on the Higgs sector. We find that non-holomorphic operators can cause significant changes as are best exhibited by the correlation between the masses of the charginos and Higgs bosons.Comment: 9 pages, 2 figures; added new reference

The Impact of Comorbid Diseases on Postoperative Complications in Children after Adenotonsillectomy: Is It a Myth?

Objective: Adenotonsillar surgery remains the second most common surgical practice in pediatric otolaryngology. We aimed to evaluate whether a comorbid disease in children undergoing surgery has any impact on postoperative complication rate.Methods: This study was conducted at a tertiary otolaryngology department with 643 children. The study included children with symptoms of obstructive sleep-disordered breathing and recurrent infection who underwent adenotonsillar surgery. Patients with a comorbid disease constituted the study group and otherwise healthy children constituted the control group. The data were evaluated to find out any association among clinical variables such as gender, age, tonsil grade, type and extent of surgery, indication for surgery, body mass index percentile, comorbid diseases and postoperative complicationsResults: There were 245 (38.1%) patients with a comorbid disease. The most common comorbidity was cardiovascular diseases (n=68) followed by neurological diseases (n=48). We performed adenoidectomy in 319, tonsillectomy in 44, tonsillotomy in nine, adenotonsillectomy (AT) in 190 and adenoidectomy with tonsillotomy (ATT) in 81 patients. The overall rate of postoperative late complication was 17/643 (2.6%) with post-tonsillectomy hemorrhage being the most common (n=10). There was no association between other clinical variables and the complication but older age (p=0.042) and type of surgery (p<0.001) revealed increased risk. The rates of complications in patients with or without comorbid disease were found 5/245 (2%) and 12/389 (3%), respectively, with no difference (p=0.621).Conclusion: The risk of postoperative complications was increased in older children and in patients undergoing AT and ATT, however, the presence of comorbid disease did not increase likelihood of postoperative complications

Treatment Outcomes for Primary Retromolar Trigone Carcinoma: A Single Institution Experience

Objective: Retromolar trigone (RMT) is a rare location for oral cavity cancers. RMT cancers are aggressive malignancies that mostly present at an advanced stage. In this study, we aimed to evaluate treatment outcomes in patients who underwent initial radical surgical resection and postoperative radiotherapy or chemoradiotherapy with a diagnosis of primary RMT squamous cell carcinoma in our institution.Methods: The study included 20 primary RMT tumor patients out of 191 oral cavity cancer cases treated from January 2010 through December 2019. We retrospectively analyzed treatment details, histopathology reports, postoperative clinical course and survival outcomes.Results: The mean age at presentation was 59.4 years. Eighty percent of all patients were either stage 3 or stage 4. We performed mandibular resection in 14 patients (70%) and partial maxillectomy in eight patients (40%). Nineteen patients (95%) underwent unilateral neck dissection. The incidence of metastatic cervical lymph node was 13/20 (65%). Overall survival (OS) and disease-free survival (DFS) rates during follow-up (mean 26.3 months) were 60% and 75%, respectively. There was statistical significance between presence of multilevel metastatic lymph nodes and OS (p=0.013). DFS and OS of early stage and advanced stage groups were 100% vs 75% and 100% vs 50%, respectively, with no statistical significance (p=0.189 and p=0.084).Conclusion: The survival of advanced stage RMT cancer is poor despite appropriate treatment. Bone involvement that necessitates resection is common due to the proximity of the tumor to the mandible and the maxilla. Multilevel positive cervical lymph nodes and advanced stage are poor prognostic factors

Analysing the privacy policies of Wi-Fi trackers

International audienceWi-Fi-based tracking systems have recently appeared. By collecting radio signals emitted by Wi-Fi enabled devices, those systems are able to track individuals. They basically rely on the MAC address to uniquely identify each individual. If retailers and business have high expectations for physical tracking, it is also a threat for citizens privacy. We analyse the privacy policies used by the current tracking companies then we show the pitfalls of hash-based anonymization. More particularly we demonstrate that the hash-based anonymization of MAC address used in many Wi-Fi tracking systems can be easily defeated using of-the-shelf software and hardware. Finally we discuss possible solutions for MAC address anonymization in Wi-Fi tracking systems

Is There a Change in the Treatment of T1 Glottic Cancer After CO2 Laser? A Comparative Study with Cold Steel

Objective: Carbon dioxide (CO2) laser provides high local control and disease-specific survival rates with minor morbidity and good quality of life in transoral cordectomy. We aimed to compare the oncological outcome and survival between cold steel and CO2 laser in the treatment of early glottic cancer.Methods: In this retrospective study, the participants were divided into two groups. The first group comprised patients who were operated upon between 2001 and 2007 using cold steel (group 1, n=38), and the second group comprised patients who were operated upon between 2008 and 2016 using CO2 laser (group 2, n=88). Both groups were compared regarding age, gender, pathological grade, T stage, type of cordectomy, margin status, anterior commissure involvement, follow-up, locoregional recurrence, and disease- free survival (DFS).Results: The overall survival rate and DFS were similar between the two groups (94.7% vs. 98.9% and 100% vs. 98.9%, respectively), and no association was found between surgical margin positivity and local recurrence. However, a significant association between the presence of anterior commissure involvement and recurrence was found in all 126 patients (p=0.016). Local recurrence was significantly higher in the group 2 (p=0.024), but it did not affect overall survival and DFS in these patients (100% vs. 94.1%).Conclusion:Although CO2 laser excision is considered to be superior to cold steel regarding surgical time and bleeding control, the local recurrence rates were found to be higher with the laser than the cold steel. Thus, we argue that cases should be selected more carefully concerning the anterior commissure, depth of tumor invasion lateral to vocal muscle, difficulty at endoscopic exposure for lesions with anterior commissure involvement, and reliability of surgical margins at frozen sections