Beyond the 3SM generation at the LHC era Workshop
→
Europe/Zurich
40-S2-D01 (CERN)
40-S2-D01
CERN
George Hou
(National Taiwan Univ., Taiwan),
Gokhan Unel
(U. C. Irvine),
Michelangelo Mangano
(CERN),
Robert Holdom
(Univ. Toronto, Canada),
Saleh Sultansoy
(TOBB Univ. Economic & Technology, Turkey),
Tobias Hurth
(CERN)
Description
"Beyond the 3SM generation at the LHC era" workshop aims to review the status of the models with additional fermion families. Theory, precision data from b/c factories, astroparticle/cosmology and collider aspects will be reviewed in this 2 day workshop.
Participants
Abbas Kenan Ciftci
Albert De Roeck
Alison Lister
Amarjit Soni
Andrew Haas
Azmi Ali Altintas
Bob Holdom
David Milstead
Erkcan Ozcan
Francois RICHARD
George W.S. Hou
Gokhan Unel
Hatice Duran Yildiz
Heiko Lacker
ILKAY TURK CAKIR
Juan Antonio Aguilar-Saavedra
Konstantin Belotsky
Leandro Da Rold
Livio Mapelli
Malik Aliev
Marc Sher
Maxim Khlopov
METIN ARIK
Mikhail Vysotsky
Nicola Serra
Norma Susana Mankoc Borstnik
Orhan Cakir
P. Q. Hung
Paoti Chang
Ramazan Sever
Regina Demina
Rena Ciftci
Rong-Shyang Lu
Saleh Sultanov
Serkant Ali Cetin
Soumitra Nandi
Tulay Cuhadar Donszelmann
Vali Bashiry
Vincenzo Vagnoni
Yuan Chao
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09:00
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09:30
Opening
Welcome Address by Michelangelo Mangano
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09:30
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11:30
Introduction and Motivation
- 09:30
- 10:00
- 10:30
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11:00
Experimental Constraints on fourth generation quark masses 30mThe existing bounds from CDF on the masses of the fourth generation quarks, t' and b', are reexamined. The bound of 256 GeV on the t' mass assumes that the primary decay of the t' is into q+W, which is not the case for a substantial region of parameter space. The bound of 268 GeV on the b' mass assumes that the branching ratio for b' --> b+Z is very large, which is not only not true for much of parameter space, but is {\em never} true for b' masses above 255 GeV. In addition, it is assumed that the heavy quarks decay within the silicon vertex detector, and for small mixing angles this will not be the case. The experimental bounds, including all of these effects, are found as a function of the other heavy quark mass and the mixing angle.Speaker: Prof. Marc Sher (WMU)
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11:30
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12:00
Discussion
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12:00
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13:00
Lunch Break 1h
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13:00
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14:40
Direct searches (Tevatron & LHC)
- 13:00
- 13:25
- 13:50
- 14:15
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14:40
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15:00
Discussion
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15:00
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15:20
Coffee Break 20m
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15:20
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16:50
Impact on Higgs Searches
- 15:20
- 15:30
- 16:00
- 16:25
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16:50
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17:10
Discussion
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17:10
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17:55
Prospects for future colliders
- 17:10
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17:25
Lepton Colliders & The fourth family 15mSpeaker: Saleh Sultansoy (TOBB University of Economics and Technology)
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17:40
Production of Single Heavy Charged Leptons at a Linear Collider 15mA sequential fourth generation of quarks and leptons is allowed by precision electroweak constraints if the mass splitting between the heavy quarks is between 50 and 80 GeV. Although heavy quarks can be easily detected at the LHC, it is very difficult to detect a sequential heavy charged lepton, L, due to large backgrounds. Should the L mass be above 250 GeV, it can not be pair-produced at a 500 GeV ILC. We calculate the cross section for the one-loop process e+e- -> L tau. Although the cross section is small, it may be detectable. We also consider contributions from the two Higgs doublet model and the Randall-Sundrum model, in which case the cross section can be substantially higher.Speaker: Prof. Marc Sher (WMU)
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17:55
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18:15
Discussion
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09:00
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09:30
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09:30
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10:30
Other LHC aspects
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09:30
A holographic fourth generation: signals at the LHC 20mI present a model with four generations of standard model fermions propagating in a five-dimensional AdS metric. I show that it is possible to break the electroweak symmetry via the condensation of the fourth generation, driven by their interactions with the Kaluza-Klein gauge bosons and by the presence of bulk higher-dimensional operators. This dynamical mechanism results in a heavy composite Higgs, which is highly localized towards the infrared boundary. The localization of the fermions in the five-dimensional bulk naturally leads to the standard model Yukawa couplings via the action of the bulk higher-dimensional operators. I show the spectrum of the model and discuss the electroweak precision constraints. I also study the production and detection of the fourth generation as well as the gluon resonances at the LHC.Speaker: Dr Leandro Da Rold (Instituto de Fisica - Universidade de Sao Paulo)
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09:50
Interactions of Heavy Exotic Hadrons 20mThe search for stable heavy exotic hadrons is a promising way to observe new physics processes at collider experiments. The discovery potential for such particles can be enhanced or suppressed by their interactions with detector material. This paper describes a model for the interactions in matter of stable hadrons containing an exotic quark of charges $\pm {1/3}e$ or $\pm {2/3}e$ using Regge phenomenology and the Quark Gluon String Model. The influence of such interactions on searches at the LHC is also discussed.Speaker: Dr David Milstead (Fysikum)
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10:10
Anomalous Resonant Production of the fourth family quarks at the LHC 20mConsidering the present limits on the masses of fourth family quarks from the Tevatron experiments, the fourth family quarks are expected to have mass larger than the top quark. Due to their expected large mass they could have different dynamics than the quarks of three families of the Standard Model. The resonant production of the fourth family t' and b' quarks are studied via anomalous processes gqi-->t' and gqj-->b' (where qi=u,c and qj=d,s,b) at the LHC. The signatures of such processes are discussed within the SM and anomalous decay modes. The sensitivity to anomalous coupling kappa/Lambda can be reached down to 0.01 TeV-1.Speaker: Orhan Cakir (University of Ankara)
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09:30
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10:30
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10:50
Discussion
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10:50
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12:00
Astroparticle & Cosmology
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10:50
Dark matter from new stable quarks and leptons 20mHeavy stable charged particles can exist, hiding from us in bound atomlike states. Models with new stable charged leptons and quarks, giving rise to realistic composite dark matter scenarios, are reviewed.Speaker: Prof. Maxim Khlopov (MEPhI and VIA/APC/CNRS)
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11:10
Model of Electroweak scale active right-handed neutrinos, its extension and phenomenological implications 25mElectroweak scale active right-handed neutrinos can be directly produced at the LHC with characteristic signatures such as like-sign dileptons. Accompanying this is a rich Higgs structure such as doubly charged scalars which can also be probed at the LHC. The Pati-Salam extension of the model contains keV sterile neutrinos with astrophysical implications and it is suggested how a fourth family can fit snugly in this framework.Speaker: Prof. P.Q. Hung (Virginia)
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11:35
On the origin of families and their mass matrices with the approach unifying spins and charges, prediction for the fourth family and the dark matter family 20mThe approach unifying all the internal degrees of freedom---the spins and all the charges into only (two kinds of) the spin---is offering a new way of understanding the properties of quarks and leptons, that is their charges and their couplings to the gauge fields, the appearance of families and their mass matrices. The (simple) starting Lagrange density for spinors in d =1+13, which carry nothing but two kinds of spins-the Dirac kind and the additional one, commuting with the Dirac one (no charges) and interact with only the gravitational field through vielbeins and two kinds of spin connection fields---the gauge fields of the two kinds of the Clifford algebra objects---manifests in d=1+3 the properties of fermions and bosons as postulated by the Standard model of the electroweak and colour interactions, with the Yukawa couplings included. In this talk a way of spontaneous breaking of the starting symmetry which leads to the properties of the observed fermions is presented and rough predictions for not yet measured fermions is made, with the dark matter candidates included. The prediction is made that the fourth family will possibly be measured at LHC. The estimation is made that a cluster of the fifth family could be measured at new experiments with NaI.Speaker: Prof. Norma Susana Mankoc Borstnik (University of Ljubljana, Fac. for Math. and Phys.)
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10:50
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12:00
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12:20
Discussion
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12:20
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13:20
Lunch Break 1h
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13:20
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14:25
Precision physics I
- 13:20
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13:45
Constraints on the quark and lepton mixing matrices from a few simple constraints within a fourth generation scenario 20mWith the LHC start ahead new interest in the existence of a possible fourth generation of quarks and leptons came up recently. We point out that in the recent literature a few useful constraints on the fourth generation CKM and PMNS matrix elements have not been fully appreciated and we discuss their correlated impact of these constraints on the quark and lepton mixing matrices.Speaker: Prof. Heiko Lacker (Berlin, Humboldt University)
- 14:05
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14:25
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14:45
Discussion
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14:45
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15:05
Coffee Break 20m
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15:05
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17:30
Precision physics II
- 15:05
- 15:30
- 15:55
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16:15
LHCb: penguin decays: Bs-> phi phi, phi gamma, phi mu mu and Bd-> K* mu mu 20mRare loop induced decays of neutral B mesons are sensitive probe of NP. The reconstruction of the decays Bs -> phi phi, phi gamma, phi mu mu, Bd -> K* gamma and K* mu mu at the LHCb experiment will be discussed. The measurement of some observables sensitive to lepton generations beyond the SM, such as the CPV in the radiative penguins, the forward-backward asymmetry in the Bd->K* mumu and the CPV in the decays Bs->phi phi, Bs->phi mumu will also be presented.Speaker: Nicola Serra (NIKHEF)
- 16:35
- 17:00
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17:30
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17:50
Discussion
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17:50
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18:10
Closing Remarks
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17:50
WS summary & further discussions 10mSpeaker: Dr Gokhan Unel (U.C. Irvine)
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17:50
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09:30
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10:30