Tulika Bose

Tulika Bose

Office: PRB, Room 369. 617-353-6027
Email:

Office Hours: Fall 2014: Wed: 11:00-12:30 and 2:00 - 3:30 PM (and by appointment)

 

Research Interests:

Selected papers:

  • 09/17/12 Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
  • 04/30/14 Search for top-quark partners with charge 5/3 in the same-sign dilepton final state
  • 05/23/14 Search for W' to tb decays in the lepton + jets final state in pp collisions at sqrt(s) = 8 TeV
  • 06/19/14 Search for pair production of excited top quarks in the lepton+jets final state
  • 01/29/13 Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV
  • 05/26/11 Search for a W' boson decaying to a muon and a neutrino in pp collisions at sqrt(s) = 7 TeV
  • 03/19/10 Commissioning of the CMS High-Level Trigger with Cosmic Rays
  • 11/30/10 Search for Heavy Stable Charged Particles in pp collisions at sqrt{s}=7 TeV
  • 11/30/10 Performance of the CMS Level-1 Trigger during Commissioning with Cosmic Ray Muons
  • 11/30/08 Search for Long-Lived Charged Massive Particles with the D0 Detector
  • 11/30/07 Search for W' resonances decaying to a top quark and a bottom quark
  • 11/30/05 Direct Limits on Bs Oscillation Frequency

Education:

B.A. Cambridge University, U.K.

Ph.D. Columbia University

Biography:

Tulika Bose received her Ph.D. in experimental high energy physics from Columbia University in 2006. Her post-doctoral research at Brown University focused on direct searches for new phenomena at the D0 experiment at the Fermilab Tevatron and at the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider. She has also extensively worked on trigger and data acquisition for both D0 and CMS and is currently serving as the Trigger Coordinator of the CMS experiment. She is an author of numerous publications in refereed journals and is actively involved in searches for new physics using data collected by CMS.

Curriculum Vitae

Honors/Awards:

Sloan Research Fellowship, 2012

The Startup of the Large Hadron Collider: BBC interview

 

In the news:

 

Research Descriptions:

The Compact Muon Solenoid

solenoid

The Compact Muon Solenoid (CMS) is a 14 kiloton detector designed to search for new physics at an unprecedented distance scale of 10-19 m at the CERN Large Hadron Collider (LHC). The detector consists of 220 square meters of silicon pixels and strips (80 million channels) for precision charged particle tracking, 75k lead-tungsten crystals for precision electron and photon measurements, a highly segmented 1000-ton brass hadron-calorimeter plus a quartz-fiber forward calorimeter to measure jets from quark and gluon scattering and energy balance, all surrounded by precision muon chambers embedded in the return yoke of the magnet. Overall, the detector features nearly complete solid-angle coverage and can precisely measure electrons, photons, muons, jets and missing energy over a large range of particle energies. These broad capabilities of the CMS detector allow the exploration of electroweak symmetry breaking and will enable the potential discovery of physics beyond the Standard Model.

The CMS trigger and data acquisition systems are responsible for ensuring that physics-enriched data samples with potentially interesting events are recorded with high efficiency and good quality. The experiment has a two-level trigger system, unlike most other hadron collider experiments that have more traditional three-level systems. The first physical level is hardware-based and is called the “Level-1 Trigger” (L1) while the second physical level is software-based and is called the “High-Level Trigger” (HLT). L1 uses information from the calorimeters and muon detectors and is designed to select, in less than 1 ms, the most interesting events starting from a total input (collision) rate of about 40 MHz. The HLT processor farm further decreases the event rate from around 100 kHz to around 400 Hz, before data storage. The trigger system, therefore, has to provide a high selectivity of ~10-5 with respect to the active LHC bunch crossings while ensuring that the ability to select rare, exotic events is preserved. Boston University is playing a leading role in the coordination of the CMS Trigger effort with Bose serving as the CMS Trigger Coordinator. Group members were involved in the design and commissioning of the CMS HLT and continue to spearhead the effort.  Many of the BU personnel resident at CERN served as HLT on-call experts during the first LHC Run (Avetisyan, Fantasia and Sperka).

The collision rate at the LHC also presents enormous technical challenges on the design of readout electronics due to the intense radiation environment and the high speed at which millions of channels of data must be processed. The Boston University group has a leadership role in calorimeter electronics and related software (Rohlf and Sulak). The group has designed and built the data concentrator, a sophisticated piece of digital electronics based on modern field programmable gate arrays (FPGAs) to read out the hadron calorimeter. Group members have also led the custom design of the 18-channel hybrid photo-diode used to convert scintillation light from the calorimeter into electrical signals. We have also designed the electronics to feed calorimeter signals into the muon trigger to greatly reduce the backgrounds in the online event selection. Members of the BU CMS team have also helped design the two hadronic forward calorimeters which are positioned at either end of the CMS detector, to pick up the myriad particles coming out of the collision region at shallow angles relative to the beam line. Group members also play a key role in the day-to-day operation of the calorimeter.

The Boston University group is also reaping the physics benefits of our investment in detector hardware, trigger and algorithm development. Group members are making significant contributions to physics analyses involving searches for new particles and the hunt for the Higgs Boson. These analyses include (among many others) searches for heavy gauge bosons and exotic WZ resonances.  We are also playing a leading role in the study of diboson production; the latter is critical for increasing the sensitivity of our Higgs searches and thereby help understand the mechanism of electroweak symmetry breaking. Bose has recently served as the co-convener of the Electroweak Diboson group (2011) and the Resonances group within the Beyond Two Generations physics group (2012-2014)

The DØ Experiment

d0

The DØ experiment studies proton-antiproton collisions at the world’s highest energy accelerator, the Fermilab Tevatron. These collisions release energy equivalent to 2000 times the proton mass. The DØ detector is a large, highly sophisticated instrument that measures the fragments of these collisions and allows scientists to study the structure of matter at these high energies. According to our current understanding, the basic constituents of matter are quarks and leptons. All the matter surrounding us is made of the lightest quarks, called up and down, and the lightest leptons, the electron and its neutrino. However there exist two additional families of quarks and leptons with identical properties, except much larger masses. The heaviest of the quarks, the "top" quark, was discovered in 1995 by the DØ and CDF collaborations at Fermilab. The top quark turned out to have an extraordinarily large mass, approximately the same as an entire gold atom. Particle physicists believe that its further study will provide clues to the origins of mass. The members of the Boston University DØ group were actively involved in the discovery of the top quark and the study of the carrier of the weak force, the "W boson". The group is now participating in the second data-taking run which began in 2001 and will continue until 2009. During this run, thousands of top quarks will be created, allowing a detailed study of the properties of this intriguing particle. The data from the Fermilab Tevatron will also provide the best opportunity until the LHC begins operation to find the Higgs boson and new physics beyond the standard model. The Boston University group has taken leadership roles in the construction of the muon detector system and the silicon microstrip tracker, the development of algorithms to identify bottom quarks and muons, and the "Top and Higgs Physics" analysis group. The group has designed and built a significant fraction of the electronics for the muon system trigger, the silicon track trigger, and the central fiber tracker trigger. The group’s physics interests center on the top quark and the search for new particles and forces beyond the standard model.