16 research outputs found
Multiple Interactions and the Structure of Beam Remnants
Recent experimental data have established some of the basic features of
multiple interactions in hadron-hadron collisions. The emphasis is therefore
now shifting, to one of exploring more detailed aspects. Starting from a brief
review of the current situation, a next-generation model is developed, wherein
a detailed account is given of correlated flavour, colour, longitudinal and
transverse momentum distributions, encompassing both the partons initiating
perturbative interactions and the partons left in the beam remnants. Some of
the main features are illustrated for the Tevatron and the LHC.Comment: 69pp, 33 figure
Constraints on Supersymmetry from LHC data on SUSY searches and Higgs bosons combined with cosmology and direct dark matter searches
The ATLAS and CMS experiments did not find evidence for Supersymmetry using
close to 5/fb of published LHC data at a center-of-mass energy of 7 TeV. We
combine these LHC data with data on B_s -> mu mu (LHCb experiment), the relic
density (WMAP and other cosmological data) and upper limits on the dark matter
scattering cross sections on nuclei (XENON100 data). The excluded regions in
the constrained Minimal Supersymmetric SM (CMSSM) lead to gluinos excluded
below 1270 GeV and dark matter candidates below 220 GeV for values of the
scalar masses (m_0) below 1500 GeV. For large m_0 values the limits of the
gluinos and the dark matter candidate are reduced to 970 GeV and 130 GeV,
respectively. If a Higgs mass of 125 GeV is imposed in the fit, the preferred
SUSY region is above this excluded region, but the size of the preferred region
is strongly dependent on the assumed theoretical error.Comment: 12 pages, 5 figures, Refs. updated, Published version in Eur. Phys.
J. C with updated references and minor corrections. arXiv admin note:
substantial text overlap with arXiv:1202.336
CMS Resistive Plate Chamber overview, from the present system to the upgrade phase I
University of Sofia, Faculty of Physics, Atomic Physics Department, 5, James
Bourchier Boulevard, BG-1164 Sofia, Bulgaria Ghent University, Department of
Physics and Astronomy, Proeftuinstraat 86, BE-9000 Ghent, Belgium Bulgarian
Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko
shaussee Boulevard 72, BG-1784 Sofia, Bulgaria Peking University, Department of
Technical Physics, CN-100 871 Beijing, China Universidad de Los Andes, Apartado
A\'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot\'a, Colombia Academy of
Scientific Research and Technology of the Arab Republic of Egypt, 101 Sharia
Kasr El-Ain, Cairo, Egypt Panjab University, Department of Physics, Chandigarh
Mandir 160 014, India Universita e INFN, Sezione di Bari, Via Orabona 4,
IT-70126 Bari, Italy INFN, Laboratori Nazionali di Frascati, PO Box 13, Via
Enrico Fermi 40, IT-00044 Frascati, Italy Universita e INFN, Sezione di Napoli,
Complesso Univ. Monte S. Angelo, Via Cintia, IT-80126 Napoli, Italy Universita
e INFN, Sezione di Pavia, Via Bassi 6, IT-Pavia, Italy Department of Physics
and Korea Detector Laboratory, Korea University, Aman-dong 5-ga, Sungbuk-gu,
Seou,l Republic of Korea Sungkyunkwan University, Department of Physics 2066,
Seobu-ro, Jangan-gu, Suwon, Gyeonggi-Do, Republic of KoreaComment: Conference Report for the "RPC2012 Conference" held in Frascati
(ITALY) 12 pages, 10 figure
Updated Reach of the CERN LHC and Constraints from Relic Density, b->s gamma and a(mu) in the mSUGRA Model
{We present an updated assessment of the reach of the CERN LHC pp collider
for supersymmetric matter in the context of the minimal supergravity (mSUGRA)
model. In addition to previously examined channels, we also include signals
with an isolated photon or with a leptonically decaying Z boson. For an
integrated luminosity of 100 fb^{-1}, values of m_{1/2}\sim 1400 GeV can be
probed for small m_0, corresponding to a gluino mass of m_{\tg}\sim 3 TeV. For
large m_0, in the hyperbolic branch/focus point region, m_{1/2}\sim 700 GeV can
be probed, corresponding to m_{\tg}\sim 1800 GeV. We also map out parameter
space regions preferred by the measured values of the dark matter relic
density, the b\to s\gamma decay rate, and the muon anomalous magnetic moment
a_\mu, and discuss how SUSY might reveal itself in these regions. We find the
CERN LHC can probe the entire stau co-annihilation region and also most of the
heavy Higgs annihilation funnel allowed by WMAP data, except for some range of
large m_0 and m_{1/2} if \tan\beta \agt 50.Comment: 22 page latex file including 10 EPS figures; bug fix in relic density
code modifies figures in co-annihilation regio