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Update Release Notes for v640 with ModAB root-finding method #21628

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silverweed merged 1 commit into from
Mar 18, 2026
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Update Release Notes for v640 with ModAB root-finding method #21628

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5 changes: 5 additions & 0 deletions README/ReleaseNotes/v640/index.md
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Expand Up @@ -33,6 +33,7 @@ The following people have contributed to this new version:
Devajith Valaparambil Sreeramaswamy, CERN/EP-SFT,\
Vassil Vassilev, Princeton,\
Sandro Wenzel, CERN/EP-ALICE,\
Ned Ganchovski, Proektsoft EOOD,\

## Deprecations

Expand Down Expand Up @@ -202,6 +203,10 @@ As part of this migration, the following build options are deprecated. From ROOT
* `builtin_vc`
* `builtin_veccore`

### Added Modified Anderson-Bjork (ModAB) root-finding algorithm

This is new and efficient bracketing root-finding algorithm. It combines bisection with Anderson-Bjork's method to achieve superlinear convergence (e.i. = 1.7-1.8), while preserving worst-case optimality. According to the benchmarks, it outperforms classical algorithms like ITP, Brent and Ridders. It is implemented as the `ROOT::Math::ModABRootFinder` class.

## RooFit

- A new RooAbsPdf has been added: `RooStudentT`, which describes the location-scale student's t-distribution.
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